FORM - 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(Section 10; Rule 13)
BIODEGRADABLE PVC FILM FOR PHARMACEUTICAL PACKAGING AND A PROCESS FOR ITS PREPARATION
BILCARE LIMITED
an Indian Company
of 601, ICC Trade Tower, Pune- 411016,
Maharashtra, India.
INVENTORS: (a) Klaus Wilhelm Morr, (b) Marco Pifferi, (c) Ajith Sashidharan Nair, and (d) Naik Praful
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFOREMED

FIELD OF THE DISCLOSURE:
The present disclosure relates to an eco-friendly PVC film and a container prepared there from for the blister packing of pharmaceutical formulations. The present disclosure also relates to a process for the preparation of the eco-friendly film.
BACKGROUND:
Blister packaging is a popular packaging method for pharmaceutical solid dosage forms which is growing rapidly. PVC based films are commonly used for this purpose as they possess suitable properties for thermo formation and protection. However, PVC being difficult to decompose, there has been request for degradable material from the industry.
There have been developments of various eco-friendly and biodegradable films, however, till date a biodegradable PVC film has not been commercially available.
Also, non PVC based materials lack the required thermal and chemical stability desirable for the manufacture of blister containers for pharmaceutical use.
Furthermore, the biodegradable material attempted to be developed in the prior art is susceptible to microbial growth at standard conditions. Presence of these types of material not only attracts microorganism, but also adversely affects the physical properties and thermal/ chemical stability required for this application.

It is because of this unique consideration that is specifically applicable in the realm of pharmaceutical packaging, standard method of producing a biodegradable or pseudo biodegradable film, by having certain starch/ cellulose based polymers like polylactic acid or PVA or any such system in the formulation can not be applied as such for the preparation of blister containers for pharmaceutical formulations.
Recently, formulations for preparing biodegradable and compostable PVC which comprise pro-degradents have been disclosed in PCT Applications WO 2006/080955 and WO 2008/140552. The pro-degradents taught in these Applications comprise an adduct of an organotitanate or organozirconate or sulfonate with a hydrocarbon radical.
Though biodegradable and compostable films have been suggested in the prior art, the films are suitable only for the production of general purpose articles in the form of sheets for use in indoor and outdoor signs, bill boards, backdrops and wall coverings. The material of the prior art, however, suffers from many shortcomings and as such they are not suitable for the manufacture of pharma-grade blister packing materials. The material as suggested in the prior art has inherent processability limitations and it can not be subjected to the rigors of a calendering process for preparation of PVC film.
There is, therefore, felt a need for a process for preparation of a biodegradable and compostable PVC film specifically adapted for the manufacture of blister containers for pharmaceutical formulations.

The present disclosure is particularly directed to overcome the shortcomings associated with the disclosures in the prior art.
Definitions:
As used in the present disclosure, the following words and phrases are
generally intended to have the meanings as set forth below, except to the extent that the context in which they are used to indicate otherwise.
The expression "pharmaceutical grade PVC" as used in the present disclosure, means a PVC material wherein the Vinyl Chloride Monomer content in said material is below 1 PPM, non toxic and complies to regulatory requirements for food and drug contact applications.
OBJECTS:
Some of the non-limiting objects which at least one embodiment of this
disclosure may achieve are:
It is an object of the present disclosure to provide a process for preparation
of a bio-degradable PVC film.
It is another object of the present disclosure to provide a bio-degradable
PVC film for pharmaceutical applications,
It is another object of the present disclosure to provide a bio-degradable
PVC film which is rigid.

It is still another object of the present disclosure to provide a bio-degradable
PVC film which is not susceptible to the attack of microorganism in normal
aerobic conditions.
It is still another object of the present disclosure to provide a bio-degradable
PVC film which is capable of undergoing biodegradation under anaerobic
conditions.
It is still another object of the present disclosure to provide a bio-degradable
PVC film which is robust to withstand the environmental and mechanical
stress which the film can experience during all stages of its processing.
It is another object of this disclosure to suggest a process for the manufacture of biodegradable PVC film and blister packs for pharmaceutical use made from these packs.
These and other objects of the present disclosure are to a great extent dealt in the disclosure.
SUMMARY:
In accordance with one aspect of the present disclosure there is provided a process for preparing a bio-degradable PVC based pharmaceutical grade thermo-formable film, said process comprising the following steps:

a. mixing pharmaceutical grade PVC resin, at least one
copolymer, at least one impact modifier, bio pro-degradent, at
least one processing aid, and at least one stabilizer in a mixer to
obtain a mixed batch of ingredients;
b. extruding the mixed batch of ingredients in an extruder at a -
screw speed ranging between 2 rpm and 15 rpm and
temperature ranging between 55 °C and 70 °C to obtain fluxed
polymeric flakes; and
c. calendering the polymeric flakes by subjecting them to at least
two calender rolls maintained at temperatures ranging between
100 °C and 250 °C to obtain a bio-degradable PVC based
pharmaceutical grade thermo-formable film,
wherein, said film is stable in aerobic conditions and is bio-degradable under anaerobic conditions.
Typically, the method step of mixing further comprises adding at least one pigment in the mixed batch.
Typically, the method step of mixing further comprises adding titanium dioxide in the mixed batch.
Typically, the method step of extruding comprises providing a difference between the torque of the feeder screw and torque of the output screw of the extruder which causes generation of pressure and heat on the mixture, resulting in fluxing of the material fed to the extruder.

Typically, the percentage difference between the torque of the feeder screw and torque of the output screw ranges between 5 and 20.
Preferably, the percentage difference between the torque of the feeder screw and torque of the output screw ranges between 8 and 16.
Typically, the pharmaceutical grade PVC resin is at least one selected from the group consisting of PVC suspension resin and PVC homopolymer suspension resin.
Typically, the copolymer is Vinyl Chloride/Vinyl Acetate copolymer.
Typically, the impact modifier is at least one selected from the group consisting of methylmethacrylate-butadiene-styrene-acrylic copolymer and acrylic modifier.
Typically, the bio pro-degradent is Ethylene-Vinyl Acetate copolymer with organoleptic additives.
Typically, the amount of bio pro-degradent ranges between 0.01 % and 20 %
with respect to the mass of the film, preferably, 0.1 % and 10.0 % with
respect to the mass of the film.
Typically, the processing aid is at least one selected from the group
consisting of anti-blocking/slipping agents, antistatic agents, lubricants,
release agents, anti-sticking agents and melt strength/viscosity balancing
agents.

Typically, the stabilizer is at least one selected from the group consisting of polymer and soyabean stabilizer.
Typically, the at least two calender rolls are arranged at a distance ranging between 0.01 mm and 50 mm from each other.
Typically, the calender rolls are arranged in a cross-axial or bending position with respect to eah other.
In accordance with another aspect of the present disclosure there is provided a bio-degradable PVC based pharmaceutical grade thermo-formable film obtained by a process of the present disclosure, said film comprising:
i. a pharmaceutically grade PVC resin, ii. a copolymer, iii. at least one impact modifier, iv. a bio pro-degradent, v. at least one processing aid, vi. optionally, a titanium dioxide, vii. at least one stabilizer and viii optionally, at least one pigment, wherein, said film is stable in aerobic conditions and is bio-degradable under anaerobic conditions. Typically, the pharmaceutical grade PVC resin is at least one selected from the group consisting of PVC suspension resin and PVC homopolymer suspension resin.
Typically, the copolymer is Vinyl Chloride/Vinyl Acetate copolymer. Typically, the impact modifier is at least one selected from the group consisting of methylmethacrylate-butadiene-styrene-acrylic copolymer and acrylic modifier.
Typically, the bio pro-degradent is Ethylene-Vinyl Acetate copolymer with organoleptic additives.

Typically, the amount of bio pro-degradent ranges between 0.01 % and 20 %
with respect to the mass of the film, preferably, 0.1 % and 10.0 % with
respect to the mass of the film.
Typically, the processing aid is at least one selected from the group
consisting of anti-blocking/slipping agents, antistatic agents, lubricants,
release agents, anti-sticking agents and melt strength/viscosity balancing
agents.
Typically, the stabilizer is at least one selected from the group consisting of
polymer and soyabean stabilizer.
Typically, the PVC film is rigid.
In accordance with another aspect of the invention there is provided a blister
pack made from the PVC film.
Brief description of the accompanying drawings:
Figure 1- illustrates the process for preparing the bio-degradable PVC based
pharmaceutical grade thermo-formable film of the present disclosure,
wherein, a= mixing and fluxing unit, b= conveyor belt unit, c= calender rolls, d= post calender unit, and e= winder unit.
Figure 2- illustrates the transmission rate data graph of the bio-degradable PVC film prepared in Example 1,
Figure 3- illustrates the FTIR graph of side A of the bio-degradable PVC film prepared in Example 1,
Figure 4- illustrates the FTIR graph of side B of the bio-degradable PVC film prepared in Example 1,

Figure 5- illustrates the heat seal strength of the biodegradable PVC film prepared in Example 1, and
Figure 6- illustrates the tensile strength of the bio-degradable PVC film prepared in Example 1.
DETAILED DESCRIPTION:
In accordance with one aspect of the present disclosure there is provided a process for preparing a bio-degradable and compostable PVC based pharmaceutical grade thermo-formable film specifically suitable for the manufacture of blister container for pharmaceutical formulations.
The process for preparing a biodegradable and compostable PVC film is specifically adapted for pharmaceutical applications, especially the preparation of blister containers in accordance with the present disclosure.
In the mixing step, the ingredients comprising PVC resin, copolymer, at least one impact modifier, bio pro-degradent, at least one processing aid, at least one stabilizer and optionally, titanium dioxide is added to a mixer and mixed thoroughly to ensure that all the ingredients are mixed uniformly prior to feeding into the extruder. Further, at least one pigment may be added depending upon the need and requirement during or after the mixing step. The pharmaceutical grade PVC resin is at least one selected from the group consisting of PVC suspension resin and PVC homopolymer suspension resin. The copolymer may be Vinyl Chloride/Vinyl Acetate copolymer.

Further, the impact modifier employed is at least one selected from the group consisting of methylmethacrylate-butadiene-styrene-acrylic copolymer and acrylic modifier.
The stabilizer in accordance with the present disclosure is at least one selected from the group consisting of a polymer and soyabean stabilizer.
The major equipment employed for carrying out this method step includes but is not limited to turbo (heated) mixer and cooling mixer.
The mixed batch is continuously fed into an extruder. The extruder produces fluxed material which is as a result of the conversion of the powdered batch into fluid material. The extruder creates the fluxed material with a minimum of entrapped air but without overheating or overworking the material.
The method step of extrusion is carried out in a kneader, typically a ko-kneader (KK) which has three primary process adjustments i.e., power feeder torque, screw speed and temperature. The power feeder is a hopper with an internal auger mounted atop the KK which supplies powdered blend to the KK. Increase in the power feeder speed forces more blend into the KK, which increases the torque. Further, changing the speed of the KK screw changes the rate of output. The percentage difference between the torque of the feeder screw and the torque of the output screw causes generation of pressure and heat on the mixture and therefore fluxing of the material which comes out in the form of flakes to be fed to the calender. The KK output is matched with the calender input to maintain a consistent level. The KK has three temperature control zones. The temperature of each zone

affects the fluxing of the powdered blend and different ingredients require different temperature settings.
The bio pro-degradent typically employed for the preparation of the PVC film of the present disclosure comprises Ethylene-Vinyl Acetate copolymer with organoleptic additives. The presence of the bio pro-degradent adversely affects the gelification process of the composite and makes extrusion process very difficult. In accordance with the process of the present disclosure, the gelification of the composition is carried out by controlling specific processing parameters during extruding. These parameters include power torque, speed and temperature. The high torque ensures the desired level of gelification whereas the optimum temperature range during the process of the present disclosure is such that it does not allow the film to become hazy. The mixed batch is fluxed by applying power feeder torque difference ranging between 5% and 20%, screw speed ranging between 2 rpm and 15 rpm and temperature ranging between 55 °C and 70 °C to obtain flakes. In accordance with the process of the present disclosure, the torque difference between the feeder screw and the output screw, particularly, ranges between 8% and 16%. In accordance with an exemplary embodiment of the present disclosure if the input feeder power is "x" then the power of the output and therefore the speed ranges between "(95/100)x" and "(80/100)x"
In accordance with the process of the present disclosure, the temperature of the mixture is lowered by 3 °C to 5 °C in order to avoid any degradation of the additive.

The extruded polymeric flakes are then made to fall on heated calender rolls where it melt and forms a film. Calendering converts the fluxed material into films of required thickness by passing through multiple heated and cooled rolls. The calender rolls have three primary means of adjustment i.e., temperature, gap and speed. In addition, cross-axis or roll bending adjustments may also be used to fine-tune the film profile. Cross-axis and roll bending offset the characteristic "oxbow" profile associated with calendered film.
Temperature parameters of calender rolls affect the viscosity of the material, which relates to behavior in the banks and overall surface quality. Differences in temperature from roll to roll may be used to facilitate the transfer of material from one roll to the next. Too high a temperature may cause degradation (discoloration, decomposition) of the material as well as a tendency to stick to the calender rolls whereas too low temperature may result in higher air entrapment, more visible flow lines, and overall poor surface quality. Further, high temperature makes the composition rigid and affects the calendering process where the polymer particles get burnt resulting in the formation of black particles. This rigidity also creates non-uniformity of the calendered films and affects thickness uniformity which is essential for blister packing application. This makes the film unsuitable for pharmaceutical applications, and especially, for the preparation of blister containers for pharmaceutical formulations.
The inventors of the present disclosure have employed processing aids to nullify the rigidity effect due to the presence of bio pro-degradent additives, and thus reduce the rigidity of the films. The additives as employed in

accordance with the process of the present disclosure also ensure uniformity of the film. Furthermore, these additives obviate the possibility of the formation of black particles during processing and thereby ensuring the preparation of films that are suitable for pharmaceutical applications, especially, for the preparation of blister containers for pharmaceutical formulations. Further, to achieve optimum quality film the temperature of the calender rolls is maintained between 100 °C and 250 °C as the take-off and cooling roll temperatures affect shrinkage characteristics and final thickness profile.
The thickness of the film depends on the gap between the two calender rolls. The gap between the two calender roll ranges between 0.01 mm and 50 mm.
Rotating speeds of the calender rolls affect overall line throughput and surface quality due to residence time on the calender rolls.
The post-calender section is adjustable for temperature and speed. The goal of both calender and post-calender controls is to produce film of uniform thickness with minimal surface imperfections and acceptable shrinkage characteristics.
The film obtained by the process of the present disclosure is stable in aerobic conditions whereas bio-degradable under anaerobic conditions. The film obtained is then cooled prior to winding into roll form by employing a winder. The equipment employed for carrying out this process of extrusion and calendering includes but are not limited to extruder (

kneader), calender rolls (heated), post calender rolls (heat & cold) and winders.
In another aspect of the present disclosure there is provided a bio-degradable PVC based pharmaceutical grade thermo-formable film prepared in accordance with the process of the present disclosure.
The PVC film envisaged in accordance with the present disclosure is compostable and anaerobically biodegradable under a landfill. Further, the PVC film of the present disclosure is also made in the form of a "paper lookalike" feel, texture and appearance.
In accordance with one of the embodiment of the present disclosure there is provided a generally pharmaceutical grade thermoforming PVC film composition comprising: i) PVC resin; ii) copolymer; iii) at least impact modifier iv) bio pro-degradent; v) at least one processing aid; vi) optionally, titanium dioxide and vii) at least one stabilizers and viii) optionally, at least one pigment. The film of the present disclosure is stable in aerobic conditions and is bio-degradable under anaerobic conditions.
The bio pro-degradent employed for the preparation of the PVC film of the present disclosure includes but is not limited to Ethylene-Vinyl Acetate copolymer with organoleptic additives. The presence of bio pro-degradent in specific proportions renders the PVC film of the present disclosure compliant for making blister container for pharmaceutical formulations while retaining its biodegradability characteristics under anaerobic conditions. The amount of the bio pro-degradent in the PVC film of the

present disclosure ranges between 0.01% to 20%, preferably between 0.1% to 10% with respect to the mass of the film. The bio pro-degradent helps microbes to break down the long polymer molecule under anaerobic conditions, especially under the ground and mineralize it into C02, methane, water and biomass.
The processing aid in accordance with the present disclosure is at least one selected from the group consisting of anti-blocking/slipping agents, antistatic agents, lubricants, release agents, anti-sticking agents and melt strength/viscosity balancing agents.
The PVC resin used for making of the film of the present disclosure is specifically devoid of any plasticizer as plasticizers tend to leach/migrate to the substance in contact. Therefore, as per the regulatory requirement, pharmaceutical grade PVC film has to be a rigid plasticizer free film.
Mobility in the polymer matrix is essential for biodegradability. The PVC film of the present disclosure comprises a polymer system which ensures internal mobility in the polymer matrix and allows the functioning of the bio pro-degrade system without the use of a plasticizer.
In accordance with yet another aspect of the present disclosure there is provided a complete biodegradable blister container prepared from the PVC film of the present disclosure as the cavity forming material and a lidding foil which is a paper based.

The disclosure will now be described with the help of following non-limiting examples.
Examples:
Example I: Preparation of biodegradable and compostable white
opaque PVC film of 250 micron
A. Batch Mixing Operation:
255.7 kg of PVC suspension resin, 49.90 kg of Vinyl chloride/vinyl Acetate Copolymer, 14.52 kg of Methylmethacrylate-Butadiene- Styrene Terpolymer, 39.50 kg of PVC emulsion polymer, 1.50 kg of polyol ester based lubricant , 0.5 kg of Amide of ethylenediamine, 2.05 kg of Polyvinyl chloride, 2.06 kg of Acrylic polymer processing aid, 2.42 kg of butadiene/methylmethacrylate/styrene, 4.00 kg of Bio Pro-degradent (Eco-pure™ manufactured by Bio-tech Environmental, LLC), 11.40 kg of Titanium dioxide, 3.75 kg of Polymer stabilizer and 3.04 kg of Partial esters of fatty acids with glycerol were added to the batch mixing system from the respective storage system using programmable logic controlled material dosage/discharge systems and mixed to obtain a thoroughly mixed batch of ingredients.
B. Calender Operation
The following process protocol was followed for carrying out the calendering operation.

PROCESS STEP EQUIPMENT PARAMETE R UNIT VALUE
Extruder Ko-Kneader Difference between the torque of the feeder screw and the torque of the output screw % 10.6

Screw speed rpm 7.6
Temperature Cylinder 1 oC 166

Speed
m/min 15.4

Temperature Cylinder
2 oC 168
Speed
m/min 16.5
Calendering Temperature Cylinder 3 oC 175

Speed
m/min 17.7

Temperature Cylinder 4 oC 178

Speed
m/min 19.4

Temperature Cylinder
5 oC 154

Speed m/min 23.0
Wind er Web tension (dN) 325
The process is followed as below
• Set the power, speed of the KK screw and the temperature of the three zones to the required level.
• Continuously feed the mixture of ingredients produced at the batch mixing operation to Ko-Kneader.

• Fine tune the power feeder torque difference, speed and temperature of KK as per the process protocol so that flakes come out uniformly,
• Set the gap, speed, and temperature of the calender rolls to the required level as per the process protocol The parameter setting should also consider thickness, gloss, clarity and surface roughness requirement.
• Start feeding the fluxed materials to the calender rolls.
• Fine tune the parameters, gap, speed and the temperature of each calender roll as per the process protocol so that the film with required thickness, clarity and gloss comes out at the end,
• Rewind the formed film in to rolls with the specified tension .
The Calender roll gaps provided the initial thickness control of the material and final thickness was determined by draw at the take-off rolls.
C. Post Calender operations,
These master rolls further can be slit into small rolls .
D. TEST DATA
The Bio degradable film thus produced is tested for following properties to prove its application for blister packing application.
1. The physical and thermo mechanical properties for the application of blister packing,
2. Blister forming machine trials,
3. Food and drug contact application compliances, and
4. Biodegradability tests.

RESULTS:
1. The physical and thermo mechanical properties for the application of blister packing

Sr.
No Parameters Test Method Unit 250 Micron Bio-PVC film
as prepared in Example I Specification of General Bilcare 250
Micron PVC film
1 Total Thickness DIN
53370 Micron 249 250 ± 5 %
2 Total GSM DIN EN ISO 2286 GSM 346 345 ±5 %
3 Impact Strength ASTM D1709 gm 1290 350 min.
4 Specific Gravity Opaque In-house gm/cc 1.38 1.38 ±10%
5 Average Yield Opaque In-house m2/kg 2.90 2.90
6 Tensile Strength ASTM D882 Kg/cm2
Longitudinal
457.92 400 min
Transverse
540.92 400 min
7 Peak Elongation ASTM D882 %
Longitudinal
3.62 4 Min
Transverse
3.79 4 Min
8 Dimensional Stability ASTM D1204 %
Longitudinal
-9 -7 max
Transverse
+2 + 2max
9 Heat Seal Strength(PVC to Al. foil) In-house Kgf/cm 0.774 0.30 min

The physical and thermo mechanical properties of the bio-degradable PVC film prepared in accordance with the process of the present disclosure are at par with the non-degradable 250 microns PVC film.
2. Blister forming machine trials
Thermoforming trials were taken on rotary vacuum forming as well flat pressure forming thermoforming machines with various cavity sizes and found that it perform exactly the same as the regular thermoforming PVC films. The thermoforming parameters remain the same with that of regular films.

Thermoformin
Sr. No Parameters Test Method Unit 250 Micron
Bio-PVC film
as prepared
in Example I g temperature
of General
Bilcare 250
Micron PVC
film
Thermo formability in
1 rotary vacuum forming machine at 20-25 Inches of vacuum In-house °C 155-158 °C 155-158°C
Thermo formability in flat bed
2 pressure forming machine at 5-6 Kg pressure In-house °C 110-125 °C 110-125°C

Thermo-formability of the bio-degradable PVC film prepared in accordance with the process of the present disclosure is at par with the non-degradable 250 microns PVC film.
3. Food and drug contact material compliances

Sr. No Parameters Test Method Unit 250 Micron Bio-PVC film as prepared in Example I Specification of General Bilcare 250 Micron PVC film
1 Toxicity Test USP
Current
Ed. Non-toxic Non-toxic
2 VCM content 2002/72/ EC ppm <1 <1
3 Global migration 2002/72/ EC ppm 5.1 <60
4 Average WVTR@ 90%RH at 38°C ASTM F 1.249 grams/
m2/24
hr. 3.72
5 Average OTR @ 0%RH at 23°C ASTM D3985 cc/m2 12 4hr. 17.322
6 FTIR In-house - Complies Complies
7 Heavy Metal Analysis
A Cadmium ICP-
OES/AE
S ppm <1 <1
B Barium

<1 <1
C Iron

2 2
D Lead

<1 <1
E Arsenic ppm

<1 <1
F Antimony ppm

<1 <1
G Chromium

<1 <1

H
Mercury <1 <1
I Tin

10 10
J Zinc

1 1
Food and drug contact material compliances of the bio-degradable PVC film prepared in accordance with the process of the present disclosure is at par with the non-degradable 250 microns PVC film.
4. Biodegradability tests:
Determining anaerobic biodegradation of plastic materials under high solids anaerobic digestion conditions Inoculum Source:
• Organic Compost - McEnroe Organic Farms, Millerton, NY
Mattabassit Waste Treatment Facility Anaerobic Digestion
♦ Solid Content 22%
♦ pH 8.2
♦ Volatile Fatty Acids 0.7 g/kg
♦ Ammonia Nitrogen 1.0 mg/kg
♦ Volatile Solids 24.9%
Procedure:
1. Three weighed replicates of the test material were prepared by placing them into 1000 grams of inoculum .in containers which were then attached to the gas measuring devices. Incubation temperatures of 52 ± 2°C were maintained by placing the containers in temperature controlled incubators.
2. Three blanks containing only inoculum, were prepared as described in (1) above, as were three positive controls each containing 20 grams of

thin layer grade cellulose. Three negative controls were also run utilizing untreated samples supplied by Northeast Laboratories.
3. Samples were incubated for forty five days in the dark, or at times, diffused light. Gas volumes were determined daily. Carbon Dioxide and Methane concentration were also determined. Temperature and room atmospheric pressures were monitored during the course of incubation.
The results are shown in the following tables.
Gas Production Data - Samples

Day 250 Micron Bio-PVC
film as prepared in
Example I Negative Control PE Positive Control Cellulose Inoculuir Control
A B C A B C A B C A B
Totals Days 1-
30 9473 10659 9877 3609 4435 3992 15662 18075 16348 3867 3180
31 25 25 50 155 180 150 185 150 205 40 50
32 25 25 50 155 180 150 185 150 205 40 50
33 42 106 85 32 106 74 53 106 32 32 42
34 116 129 110 16 97 48 113 90 90 32 32
35 116 129 110 16 97' 48 113 90 90 32 32
36 116 129 110 16 97 48 113 90 90 32 32
37 274 274 205 34 71 68 205 171 171 102 102
38 274 274 205 34 71 68 205 171 171 102 102
39 274 274 205 34 71 68 205 171 171 102 102
40 40 50 200 50 50 50 100 100 130 70 80
41 51 51 44 17 13 27 68 68 68 137 68
42 51 51 44 17 13 27 68 68 68 137 68
43 51 51 44 17 13 27 68 68 68 137 68
44 69 87 52 17 0 24 52 52 62 0 13
45 69 87 52 17 0 24 52 52 62 0 13
46 0 10 0 50 20 50 50 50 30 30 10

47
9 9 9 28 15 38 67 57 67 28 19
Totals 11075 12420 11452 4314 5529 4981 17564 19779 18128 4920 4063
Averages 11649 4941 18490 4728
Methane and Carbon Dioxide Readings

Day 250 Micron Bio-PVC film as prepared in Example 1 Negative Control 100 % PE Plastic Positive Control Cellulose Inoculum Control
% Average Methane
% Carbon Dioxide
% Methane
% Carbon Dioxide
% Methane
% Carbon Dioxide
% Carbon Dioxide
% Methane
%
Averages
Days 1-
30 25.7 % 22.2 % 20.5 % 17.6 % 55% 35.2 % 25.2 % 23%
34 26% 18% 18.4% 10.2 % 49% 38.4 % 22% 15.7%
38 25% 15 % 13.1 % 11.6% 51% 39.1% 24% 13.6%
43 25% 17% 17.4% 11.2% 48% 32.3 % 20% 13.5 %
Average 25.6 % 20.4 % 24.9% 15.4 % 53.1 % 35.7 % 24.1 % 20.1 %
Calculations of Results

Sample Average Weight grams Average
Gas
Vol.
(mL) Methane Carbon Dioxide

(%) (mL) (Wt)
c
(grams) (%) (mL) (Wt)
c
(grams) Total
CH4+
C02 Sample-Inoculum1
250
Micron
Bio-PVC
film as
prepared
in
Example
1 25 11649 25.6 2982 1.6 20.4 2376 1.3 2.9 1.8

Negative Control 25 4941 24.9 1230 0.7 15.4 761 0.4 1.1 0
Positive Control 20 18490 53.1 9818 5.3 35.7 6601 3.5 8.8 7.7
Inoculum Control 1000 4728 24.1 1140 0.6 20.1 950 0.5 1.1

Results (Average of 3)
Gaseous Carbon Recovered Theoretical Grams (%) Biodegradation
Days 1-45
250 Micron Bio-
PVC film as
prepared in
Example 1 1.8 9.61 18.7%
Negative Control 0 21.4 0%
Positive Control 7.7 8.8 87.5 %
The PVC film of the present disclosure has shown 18.7 % biodegradation after 45 days of testing under the method ASTM D5511-02. The results support the suitability of the product for the blister packing application. It also depicts the biodegradation of the film
Example II: Preparation of biodegradable and compostable Glass Clear PVC film of 250 micron
A. Batch Mixing Operation:
449.00 kg of PVC suspension resin, 23.600 kg of Methylmethacrylate-Butadiene-Styrene-Acrylic copolymer, 0.491 kg of Triple Pressed Stearic Acid Veg, 0.491 kg of Mg-Silicate based talc, 2.360 kg of Soyabean

stabilizer, 4.910 kg of Amide of Ethylenediamine, 4.420 kg of Polyvinyl chloride, 1.970 kg of Acrylic polymer processing aid, 3.440 kg of Methylmethacrylate-Butadiene-Styrene processing aid, 3.440 kg of Bio Pro-degradent (Eco-pure™ manufactured by Bio-tech Environmental, LLC), 1.180 kg of Fatty acid ester of poly functional alcohols and 4.420 kg of Polymer stabilizer were added to the batch mixing system from the respective storage system using programmable logic controlled material dosage/discharge systems and mixed to obtain a thoroughly mixed batch of ingredients.
B. Calender Operation:
The following process protocol as developed by the inventors of the present disclosure was followed for carrying out the calendering operation.

PROCESS STEP EQUIPMENT PARAMETE R UNIT VALUES
Extruder Ko-Kneader Difference between the torque of the feeder screw and the torque of the output screw % 10.19

Screw speed Rpm 17.6
Calendering Temperature Cylinder 1 oC 174

Speed
m/min 20.3

Temperature Cylinder
2 oC 177

Speed
m/min 22.3
Temperature Cylinder oC 196

Speed 3 m/min 24.7

Temperature Cylinder 4 oC 205

Speed
m/min 28.1

Temperature Cylinder
5 oC 162

Speed
m/min 33.5
Winder Web tension (dN) 350
The film was prepared by the process as described in Example I. C. TEST DATA
The Bio degradable film thus produced is tested for following properties to prove its application for blister packing application.
1. The physical and thermo mechanical properties for the application of blister packing,
2. Blister forming machine trials, and
3. Biodegradability tests.
RESULTS:
1. The physical and thermo mechanical properties for the application of blister packing

Sr. No Parameters Test Method Unit 250 Micron Bio-PVC film
as prepared in Example II Specification of General Bilcare 250
Micron PVC film
1 Total Thickness DIN
53370 Micron 253 250 ± 5 %
2 Total GSM DIN EN ISO 2286 GSM 338 340 ± 5 %
3 Impact Strength ASTM D1709 gm 1200 350 min.
4 Specific Gravity Opaque In-house gm/cc 1.35 1.35±5%
5 Average Yield Opaque In-house m2/kg 2.96 2.90
6 Tensile Strength ASTM D882 Kg/cm2
Longitudinal
457.92 400 min
Transverse
540.92 400 min
7 Peak Elongation ASTM
D882 %
Longitudinal
3.62 4 Min
Transverse
3.79 4 Min
8 Dimensional Stability ASTM D1204 %
Longitudinal
-7 -7 max
Transverse
+ 2 + 2max
9 Heat Seal Strength(PVC to Al. foil) In-house Kgf/cm 0.80 0.30 min
The Physical and thermo mechanical properties of the bio-degradable PVC film prepared in accordance with the process of the present disclosure are at par with the non-degradable 250 microns PVC film.

2. Blister forming machine trials
Thermoforming trials were taken on rotary vacuum forming as well flat pressure forming thermoforming machines with various cavity sizes and found that it perform exactly same as the regular thermoforming PVC films. The thermoforming parameters remain same with that of regular films.

Thermoformin
Sr.
JVo Parameters Test Method Unit 250 Micron Bio-PVC film
as prepared in Example II g temperature of General BiJcare 250
Micron PVC film
Thermo formability in rotary vacuum
1 forming machine at 20-25 Inches of vacuum In-house °C 150-155°C 150-155 C
Thermformabi lity in flat bed
2 pressure forming machine at 5-6 Kg pressure In-house °C 105-120 °C 105-120 °C
Thermo formability of the bio-degradable PVC film prepared in accordance with the process of the present disclosure is at par with the non-degradable 250 microns PVC film.
3. Biodegradability tests: Determining anaerobic biodegradation of plastic materials under high solids anaerobic digestion conditions Inoculum Source:

• Organic Compost - McEnroe Organic Farms, Millerton, NY
Mattabassit Waste Treatment Facility Anaerobic Digestion
♦ Solid Content 22%
♦ pH 8.2
♦ Volatile Fatty Acids 0.7 g/kg
♦ Ammonia Nitrogen 1.0 mg/kg
♦ Volatile Solids 24.9%
Procedure: The procedure followed was the same as described in Example I
Theoretical Gas Production

Samples Carbon Content (grams) Methane (grams) Carbon Dioxide (grams)
250 Micron Bio-PVC film as prepared in Example II 9.61 12.9 35.2
Negative Control
(PE) (25 grams) 21.4 28.6 78.5
Positive Control
(Cellulose) (20 grams) 8.8 11.8 32.3
Gas Production Data - Samples

Day 250 Micron Bio-PVC film as prepared in Example II Negative Control PE Positive Control Cellulose Inoculum Control
A B C A B C A B C A B C
Totals 1-30 4992 5012 5153 1657 1298 1296 19334 19621 20238 2597 2283 2142
Totals 31-45 738 621 562 309 311 271 1030 954 1137 420 313 366
Avgs 31-45 640 297 1040 366

Methane and Carbon Dioxide Readings

Day 250 Micr
PVC fi
prepar
Exam on Bio-lm as ed in ple II Negative Control PE Positive Control Cellulose Inoculum Control
% Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide
33 16% 13.8 % 12% 7.6 % 29% 25.9 % 13% 9.3 %
38 21% 12.9 % 9% 7.3 % 32% 29.7 % 10% 7.6 %
42 13% 10.2 % 8% 7.9 % 26% 24.2% 9% 9.1 %
Ave 16.7 % 12.3 % 9.7 % 7.6 % 29% 26.6 % 10.7 % 8.7 %
Calculations of Results

Sample Average
Weight
grams Average Gas Vol. (mL) Methane Carbon Dioxide

(%) (mL) (Wt)
c
(grams) (%) (mL) (Wt)
c
(grams) Total
CH4+
C02 Sample-Inoculunr
250
Micron
Bio-PVC
film as
prepared
in
Example
II 25 640 16.7 107. 0.057 12.3 79 0.042 0.099 0.061
Negative
Control
PE 25 297 9.7 29 0.016 7.6 23 0.012 0.028 0
Positive Control 20 1040 29 302 0.16 26.7 278 0.15 0.31 0.272
Inoculum Control 1000 366 10.7 39 0.021 8.7 32 0.017 0.038

Results (A verage of 3)
Gaseous
Carbon
Recovered Theoretical Grams (%) Biodegradation
Days 31-45 (%) Biodegradation
Days 1-45
250
Micron
Bio-PVC
film as
prepared
in
Example
II 0.06 9.61 0.065% 8.015 %
Negative
Control
PE 0 21.4 0% 0%
Positive Control 0.272 8.8 3.09 % 91.09%
The results support the suitability of the product for the blister packing application. It also depicts the biodegradation of the film.
Example III: Preparation of biodegradable and compostable and stretched PVC film of 250 micron
A. Batch Mixing Operation:
187.00 kg of PVC homopolymer suspension resin, 243.00 kg of Vinyl chloride/Vinyl Acetate copolymer, 34.100 kg of Methylmethacrylate-Butadiene- Styrene acrylic copolymer, 6.330 kg of Polymer stabilizer, 21.900 kg of Dicarboxylic acid ester, 1.460 kg of Fatty acid ester of polyfunctional alcohols, 1.220 kg of butadiene/ methylmethacrylate /styrene processing aid, 0.487 kg of Montanic ester wax, 0.414 kg of Mg-Silicate based talc and 3.410 kg of Bio Pro-degradent (Eco-pure™ manufactured by Bio-tech Environmental, LLC) were added to the batch mixing system from

the respective storage system using programmable logic controlled material dosage/discharge systems and mixed to obtain a thoroughly mixed batch of ingredients.
B. Calender Operation: The following process protocol was followed for carrying out the calendering operation.

PROCESS STEP EQUIPMENT PARAMETE R UNIT VALUE
Extruder Ko-Kneader Difference between the torque of the feeder screw and the torque of the output screw % 12.09

Screw speed rpm 9.4
Calendering Temperature Cylinder 1 oC 159

Speed
m/min 14.6

Temperature Cylinder
2 oC 160

Speed
m/min 16.1

Temperature Cylinder 3 oC 174

Speed
m/min 17.8

Temperature Cylinder 4 oC 193

Speed
m/min 20.7

Temperature Cylinder
5 oC 162

Speed
25.2
Winder Web tension (dN) 250

The film was prepared by the process as described in Example I.
C. TEST DATA
The Bio degradable film thus produced is tested for Biodegradability properties to prove its application for blister packing application.
RESULTS:
1. Biodegradability tests: Determining anaerobic biodegradation of plastic materials under high solids anaerobic digestion conditions Inoculum Source:
• Organic Compost - McEnroe Organic Farms, Millerton, NY
Mattabassit Waste Treatment Facility Anaerobic Digestion
♦ Solid Content 22%
♦ pH 8.2
♦ Volatile Fatty Acids 0.7 g/kg
♦ Ammonia Nitrogen 1.0 mg/kg
♦ Volatile Solids 24.9%
Procedure: The procedure followed was the same as described in Example I
Theoretical Gas Production

Samples Carbon Content (grams) Methane (grams) Carbon Dioxide (grams)
250 Micron Bio-PVC film as prepared in Example III 9.61 12.9 35.2
Negative Control
(PE) (25 grams) 21.4 28.6 78.5
Positive Control
(Cellulose) (20 grams) 8.8 11.8 32.3

Gas Production Data - Samples

Day 250 Micron Bio-PVC film as prepared in Example III 9.61 12.9 35.2
A B110 258C A. B C A B C A B C
Totals 1-30 4752 5203 4344 1657 1298 1296 19334 19621 20238 2557 2283 2142
Totals 31-45 748 716 800 311 271 1030 1030 954 1137 420 313 366
Avgs 31-45 1085 297 1040 366
Methane and Carbon Dioxide Readings

Day 250 Micron Bio-PVC film as prepared in Example III 9.61 12.9 35.2
% Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide
33 15% 13.8% 12% 7.6 % 29% 25.9 % 13% 9.3 %
38 15% 10.9% ■9% 7.3 % 26% 24.2 % 10 % 7.6 %
42 19% 12.1 % 8% 7.9 % 26% 24.2% 9% 9.1 %
Avg 16.3 % 12.3 % 9.7 % 7.6 % 29% 26.6 % 10.7% 8.7 %
Calculations of Results

Sample: Average Weight grams Average
Gas
Vol.
(mL) Methane 1 Carbon Dioxide

(%) (mL) (Wt)
c
(grams) (%) (mL) (Wt)
C
(grams) Total
CH4+
C02 Sample-Inoculum=
250
Micron
Bio-PVC 25 755 16.3 123 0.066 12.3 93 0.05 0.116 0.078
film as prepared

in

Example
III
Negative 25 297 9.7 29 0.016 7.6 23 0.012 0.028 0
Control
PE
Positive 20 1040 29 302 0.16 26.7 278 0.15 0.31 0.272
Control
Inoculum 1000 366 107 39 0.028 8.7 32 0.017 0.038
Control

Results (Average of 3)
Gaseous Theoretical (%) (%)
Carbon Grams Biodegradation Biodegradation
Recovered Days 31-45 Days 1-45
250 0.078 9.61 0.81 7.2
Micron
Bio-PVC
film as *
prepared
in
Example
III
Negative 0 21.4 0 0
Control
PE
Positive 0.272 8.8 3.09 91.09
Control
The results support the suitability of the product for the blister packing application. It also depicts the biodegradation of the film prepared in accordance with the process of the present disclosure.
Example IV:
A. Batch Mixing Operation:

187.00 kg of PVC homopolymer suspension resin, 243.00 kg of Vinyl chloride/Vinyl Acetate copolymer, 34.100 kg of Methylmethacrylate-Butadiene- Styrene acrylic copolymer, 6.330 kg of Polymer stabilizer, 21.900 kg of Dicarboxylic acid ester, 1.460 kg of Fatty acid ester of polyfunctional alcohols, 1.220 kg of butadiene/ methylmethacrylate /styrene processing aid, 0.487 kg of Montanic ester wax, 0.414 kg of Mg-Silicate based talc and 3.410 kg of Bio Pro-degradent (Eco-pure™ manufactured by Bio-tech Environmental, LLC) were added to the batch mixing system from the respective storage system using programmable logic controlled material dosage/discharge systems and mixed to obtain a thoroughly mixed batch of ingredients.
B. Calender Operation:
The following process protocol as developed by the inventors of the present disclosure was followed for carrying out the calendering operation. The same manufacturing process as in the example 1 is followed till the calendering stage. Further the film is heated and stretched in both directions to make it a thinner film. These films are used for shrink packaging applications.

PROCESS STEP EQUIPMENT PARAMETE R UNIT VALUE
% 12.09
Extruder Ko-Kneader Difference between the torque of the
feeder screw
and the torque of the output

screw

Screw speed rpm 9.4
Calendering Temperature Cylinder 1 oC 159

Speed
m/min 14.6

Temperature Cylinder
2 oC 160

Speed
m/min 16.1

Temperature Cylinder 3 oC 174

Speed
m/min 17.8

Temperature Cylinder 4 oC 193

Speed
m/min 20.7

Temperature Cylinder
5 oC 162

Speed
m/min 25.2
Winder Web tension (dN) 250
Stenter Temperature Heat Zone 1 oC 105

Heat
Zone 2 oC 95

Heat
Zone 3 oC 90

Stretch Zonel oC 88

Stretch Zone 2 oC 88
C. Test Data
The film thus produced is tested for its biodegradability Results:

Determining anaerobic biodegradation of plastic materials under high solids anaerobic digestion conditions Inoculum Source:
• Organic Compost - McEnroe Organic Farms, Millerton, NY
Mattabassit Waste Treatment Facility Anaerobic Digestion
♦ Solid Content 22%
♦ pH 8.2
♦ Volatile Fatty Acids 0.7 g/kg
♦ Ammonia Nitrogen 1.0 mg/kg
♦ Volatile Solids 24.9%
Procedure: The procedure followed was the same as described in Example I
The results are shown in the following tables.
Theoretical Gas Production

Samples Carbon Content (grams) Methane (grams) Carbon Dioxide (grams)
Bio-PVC film as prepared in Example IV 9.61 12.9 35.2
Negative Control (PE) (25 grams) 21.4 28.6 78.5
Positive Control (Cellulose) (20 grams) 8.8 11.8 32.3

Gas Production Data - Samples

Day Bio-PVC film as prepared in Example IV Negative
Control
PE Positive Control Cellulose Inoculum Control
A B C A B C A B C A B C
Totals 1-30 5819 5683 4572 1710 971 1019 17457 18409 16671 1686 1550 1650
31 75 83 73 9 22 24 66 97 107 9 12 12
32 75 83 73 9 22 24 66 97 107 9 12 12
33 75 83 73 9 22 24 66 97 107 9 12 12
34 75 50 95 25 30 25 325 250 245 60 50 50
35 75 50 95 25 30 25 325 250 245 60 50 50
36 89 71 84 9 19 7 173 138 148 37 24 17
37 89 71 84 9 19 7 173 138 148 37 24 17
38 89 71 84 9 19 7 173 138 148 37 24 17
39 89 71 84 9 19 7 173 138 148 37 24 17
40 91 98 98 7 35 28 278 165 116 35 28 70
41 91 98 98 7 35 28 278 165 116 35 28 70
42 91 98 98 7 35 28 278 165 116 35 28 70
43 21 39 35 19 11 21 55 39 49 23 19 9
44 21 39 35 19 11 21 55 39 49 23 19 9
45 21 39 35 19 11 21 55 39 49 23 19 9
Totals 31-45 1067 1044 1144 191 340 297 2539 1955 1898 469 373 441
Avgs 31-45 1085 276 2131 428
Methane and Carbon Dioxide Readings

Day Bio-PVC film as prepared in Example IV Negative Control PE Positive Control Cellulose Inoculum Control
% Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide
35 20% 19.3 % 9% 8.1 % 21% 17.6% 7% 4.8 %
40 21% 17.4% 7% 5.4 % 25% 14.5 % 5% 4.5 %
45 17% 15.6% 4% 3.9 % 12% 9.1 % 5% 4.5 %
Avg 19.3 % 17.4 % 6.7 % 5.8 % 19.3 % 13.7 % 5.7 % 4.6 %

Calculations of Results

Average
Weight
grams Average Gas Vol. (mL) Methane Carbon Dioxide
Sample

(%) (mL) (Wt)
c
(grams) (%) (mL) (Wt)
c
(grams) Total
CH4+
C02 Sample-Inoculum-
Bio-PVC
film as
prepared
in
Example
IV 25 1085 19.3 209 0.11 17.4 189 0.1 0.21 0.19
Negative
Control
PE 25 276 6.7 19 0.01 5.8 16 0.009 0.019 0
Positive Control 20 2131 19.3 411 0.22 13.7 292 0.16 0.38 0.36
Inoculum Control 1000 428 5.7 24 0.01 4.6 20 0.01 0.02

Results (A verage of 3)
Gaseous
Carbon
Recovered Theoretical Grams (%) Biodegradation
Days 31-45 (%) Biodegradation
Days 1-45
Bio-PVC
film as
prepared
in
Example
IV 0.19 9.61 1.98% 9.57 %
Negative
Control
PE 0 21.4 0% 0%
Positive Control 0.36 8.8 4.09 % 87.39 %

The results support the suitability of the product for the blister packing application. It also depicts the biodegradation of the film prepared in accordance with the process of the present disclosure.
Example V:
A. Batch Mixing Operation:
407.00 kg of PVC homopolymer suspension resin, 24.700 kg of Vinyl chloride/vinyl Acetate Copolymer, 6.900 kg of Polymer stabilizer, 37.00 kg of Acrylic polymer impact modifier, 1.480 kg of Montanic ester wax, 6.160 kg of epoxidized soyabean oil, 6.160 kg of Partial esters of fatty acids with glycerol, 2.460 kg of butadiene/ methylmethacrylate/ styrene processing aid, 1.230 kg of Bis-stearoyl-ethylenediamine, 1.230 kg of Polyvinyl chloride, 1.230 kg of Acrylic polymer processing aid, 0.988 kg of Polyadipate, 0.367 kg of Mg-Silicate based talc and 3.480 kg of Bio Pro-degradent (Eco-pure™ manufactured by Bio-tech Environmental, LLC) were added to the batch mixing system from the respective storage system using programmable logic controlled material dosage/discharge systems and mixed to obtain a thoroughly mixed batch of ingredients.
B. Calender Operation:
The following process protocol was followed for carrying out the calendering operation.

PROCESS STEP
EQUIPMENT PARAMETE R UNIT VALUE
Extruder Ko-Kneader Difference
between the
torque of the
feeder screw
and the torque
of the output
screw % 11.54

Screw speed rpm 8.5
Calendering Temperature Cylinder 1 oC 175

Speed
m/min 13.7

Temperature Cylinder
2 oC 177

Speed
m/min 15.1

Temperature Cylinder 3 oC 190

Speed
m/min 16.6

Temperature Cylinder 4 oC 205

Speed
m/min 19.5

Temperature Cylinder
5 oC 175

Speed
m/min 24.8
Winder Web tension (dN) 250
Stenter Temperature Heat Zone 1 oC 115

Heat Zone 2 oC 102

Heat Zone 3 oC 100

Stretch Zonel oC 99

Stretch Zone 2 oC 98

The same manufacturing process as in the example 1 is followed till the calendering stage. Further the film is heated and stretched in both directions to make it a thinner film. These films are used for shrink packaging applications.
C. Test Data
The film thus produced is tested for its biodegradability Results:
Determining anaerobic biodegradation of plastic materials under high solids anaerobic digestion conditions Inoculum Source:
• Organic Compost - McEnroe Organic Farms, Millerton, NY
Mattabassit Waste Treatment Facility Anaerobic Digestion
♦ Solid Content 22%
♦ pH 8.2
♦ Volatile Fatty Acids 0.7 g/kg
♦ Ammonia Nitrogen 1.0 mg/kg
♦ Volatile Solids 24.9%
Procedure: The procedure followed was the same as described in Example I
The results are shown in the following tables.
Theoretical Gas Production

Samples Carbon Content (grams) Methane (grams) Carbon Dioxide (grams)
Bio-PVC film as prepared in Example V 9.61 12.9 35.2
Negative Control (PE) (25 grams) 21.4 28.6 78.5
Positive Control (Cellulose) (20 grams) 8.8 11.8 32.3

Gas Production Data - Samples

Day Bio-PVC film as prepared in Example V Negative Control PE Positive Control Cellulose Inoculum Control
A'. B C A B C A B C A B C
Totals 1-30 5267 4823 4635 1525 2063 1664 17525 18001 15342 3140 2805 2711
Totals 31-45 901 1100 852 247 220 215 1198 1377 1441 300 266 319
Avgs 31-45 951 227 1339 295
Methane and Carbon Dioxide Readings

Day Bio-PVC prepar Exam film as ed in ple V Negative Control PE Positive Control Cellulose Inoculum Control
% Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide Methane Carbon Dioxide
34 18% 19.9% 5% 3.8 % 29% 26.8 % 7% 5.4%
38 16% 15.9% 3% 3.5 % 30% 29.2 % 3% 2.9 %
45 16% 15.9% 3% 3.5% 27% 24.3% 4% 3.4 %
Avg 16.7 % 17% 3.7 % 3.5 % 28.7 % 26.8 % 4.7% 3.9 %
Calculations of Results

Sample Average Weight grams Average
Gas
Vol.
(mL) Methane | Carbon Dioxide

(%) (mL) (Wt)
c
(grams) (%) (mL) (Wt)
c
(grams) Total
CH4+
C02 Sample-Inoculum=
Bio-PVC
film as
prepared
in Example
V 25 951 16.7 159 0.09 17 162 0.09 0.18 0.17

Negative
Control
PE 25 227 3.7 8 0.004 3.5 8 0.004 0.008 0
Positive Control 20 1339 28.7 384 0.21 26.8 359 0.19 0.40 0.39
Inoculum Control 1000 295 4.7 14 0.008 3.9 12 0.006 0.004

Results (A verage of 3)
Gaseous
Carbon
Recovered Theoretical Grams (%) Biodegradation
Days 31-45 (%) Biodegradation
Days 1-45
Bio-PVC film as prepared
in Example
V 0.17 9.61 1.77% 10.1%
Negative
Control
PE 0 21.4 0% 0%
Positive Control 0.39 8.8 4.43 % 84.65%
The results support the suitability of the product for the blister packing application. It also depicts the biodegradation of the film prepared in accordance with the process of the present disclosure.
Example VI
The film produced as per the example I is kept at temperature and Humidity conditions of 40 °C and 75% RH for testing the possibility of any microbial growth or yield or mould growth due to the biodegradability characteristics of the film for testing its applicability in food and pharma contact materials.

Testing procedure
1. Sampling Locations
The films produced as per example 1 were kept at environmental chamber maintaining 40 °C and 75% RH . Films were periodically withdrawn from the chambers and tested for any microbial, mould or yield growth. In Parallel, a non bio-degradable sample was also studied under the same condition as the reference sample.
2. Sampling & Analysis methodology
a) Total plate count and Total yeast & mould cound (Swab Sample) Sampling Technique
A Sterile Swab was being moistened in the swab head. Rub the swab head slowly and thoroughly over approximately 100cm (with a 10x10cm sterile template) of surface three times, reversing direction between strokes. Pour Plate Technique
For total bacterial count: Pipette 1ml of liquid from the phosphate buffer solution in to a sterile petri dish. Add sterile Trypticase Soy Agar (TSA) into the inoculated dish, rotate and allowed to solidify
and was then incubated or 48 hours at 35°C. For Total yeast &

mould count add sterile Potato Dextrose Agar (PDA) into the inoculated dish and was then incubated for 120 hours at 25 °C.
Results are tabulated in Table 1.
Table 1: Comparative microbial test results of 250 Micron Bio -PVC White Opaque film prepared in example 1 and 300 Micron PVC Glass Clear, Bilcare

Sr
No. Number Total Bacterial Total Yeast &

Product of Months Counts Mould Counts

(Mths) (CFC/100cm2) (CFC/100cm2)
250 Mics bio-PVC White
1 Opaque as prepared in example 1 1 <10. <10
300 Mics
2 PVC Glass Clear 1 <10 <10
250 Mies bio-PVC White
3 Opaque as prepared in example 1 2 <10 <10
300 Mies
4 PVC Glass Clear 2 <10 <10
250 Mics bio-PVC White
5 Opaque as prepared in example 1 3 <10 <10

300 Mixcs
6 PVC Glass Clear 3 <10 <10
250 Mics bio-PVC White
7 Opaque as prepared in example 1 4 <10 <10
300 Mics
8 PVC Glass Clear 4 <10 <10
250 Mics bio-PVC White
9 Opaque as prepared in example 1 5 <10 <10
300 Mics
10 PVC Glass Clear 5 <10 <10
250 Mics bio-PVC White
11 Opaque as prepared in example 1 6 <10 <10
300 Mics
12 PVC Glass Clear 6 <10 <10
Form the test results it is seen that the Bacterial and Yeast & Mould counts were not detected in both the biodegradable film as well as the reference film. This proves that the invented film is biodegradable only at land filling, anaerobic conditions and no microbial growth is possible at the regular storage condition. This makes the film suitable for the food and drug contact application though it is capable of biodegradation after use.

Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression " a" ,"at least" or "at least one" suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
The numerical values given for various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher or lower than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the disclosure and the claims unless there is a statement in the specification to the contrary.
While certain embodiments of the inventions have been described, these embodiments have been presented by way of examples only, and are not intended to limit the scope of the disclosure. Variations or modifications in the combination of this invention, within the scope of the disclosure, may occur to those skilled in the art upon reviewing the disclosure herein. Such variations or modifications are well within the spirit of this disclosure. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the disclosure.

We Claim:
1. A process for preparing a bio-degradable PVC based pharmaceutical
grade thermo-formable film, said process comprising the following
steps:
a. mixing pharmaceutical grade PVC resin, copolymer, at least
one impact modifier, bio pro-degradent, at least one processing
aid, and at least one stabilizer in a mixer to obtain a mixed
batch of ingredients;
b. extruding the mixed batch of ingredients in an extruder at a
screw speed ranging between 2 rpm and 15 rpm and
temperature ranging between 55 °C and 70 °C to obtain fluxed
polymeric flakes; and
c. calendering the polymeric flakes by subjecting them to at least
two calender rolls maintained at temperatures ranging between
100 °C and 250 °C to obtain a bio-degradable PVC based
pharmaceutical grade thermo-formable film,
wherein, said film is stable in aerobic conditions and is bio-degradable under anaerobic conditions.
2. The process as claimed in claim 1, wherein the method step of mixing further comprises adding at least one pigment in the mixed batch.
3. The process as claimed in claim 1, wherein the method step of mixing further comprises adding titanium dioxide in the mixed batch.
4. The process as claimed in claim 1, wherein the method step of extruding comprises maintaining a predetermined percentage

difference between the torque of the feeder screw and torque of the output screw of the extruder which causes generation of pressure and heat on the mixture, resulting in fluxing of the material.
5. The process as claimed in claim 4, wherein the percentage difference
between the torque of the feeder screw and torque of the output screw
s ranges between 5 and 20, preferably, 8 and 16.
6. The process as claimed in claim 1, wherein the pharmaceutical grade PVC resin is at least one selected from the group consisting of PVC suspension resin and PVC homopolymer suspension resin.
7. The process as claimed in claim 1, wherein the copolymer is Vinyl Chloride /Vinyl Acetate copolymer.
8. The process as claimed in claim 1, wherein the impact modifier is at least one selected from the group consisting of methylmethacrylate-butadiene-styrene-acrylic copolymer and acrylic modifier.
9. The process as claimed in claim 1, wherein the bio pro-degradent is Ethylene-Vinyl Acetate copolymer with organoleptic additives.
lO.The process as claimed in claim 1, wherein the amount of bio pro-degradent ranges between 0.01 % and 20 % with respect to the mass of the film, preferably, 0.1 % and 10.0 % with respect to the mass of the film.

11.The process as claimed in claim 1, wherein the processing aid is at least one selected from the group consisting of anti-blocking/slipping agents, antistatic agents, lubricants, release agents, anti-sticking agents and melt strength/viscosity balancing agents.
12. The process as claimed in claim 1, wherein the stabilizer is at least one selected from the group consisting of polymer and soyabean stabilizer.
13.The process as claimed in claim 1, wherein the two calender rolls are arranged at a distance ranging between 0.01 mm and 50 mm from each other.
14,The process as claimed in claim 1, wherein the calender rolls are arranged in a cross-axial or bending position.
15.A bio-degradable PVC based pharmaceutical grade thermo-formable film obtained by a process of claim 1, said film comprising:
i. a pharmaceutically grade PVC resin, ii. a copolymer, iii. at least one impact modifier, iv. A bio pro-degradent, v. at least one processing aid, vi. optionally, a titanium dioxide, vii. at least one stabilizer and viii optionally, at least one pigment, wherein, said film is stable in aerobic conditions and is bio-degradable under anaerobic conditions.

16.The film as claimed in claim 15, wherein the pharmaceutical grade PVC resin is at least one selected from the group consisting of PVC suspension resin and PVC homopolymer suspension resin.
17.The film as claimed in claim 15, wherein the copolymer is Vinyl Chloride/Vinyl Acetate copolymer.
18",The film as claimed in claim 15, wherein the impact modifier is at least one selected from the group consisting of methylmethacrylate-butadiene-styrene-acrylic copolymer and acrylic modifier.
19.The film as claimed in claim 15, wherein the bio pro-degradent is Ethylene-Vinyl Acetate copolymer with organoleptic additives.
20.The film as claimed in claim 15, wherein the amount of bio pro-degradent ranges between 0.01 % and 20 % with respect to the mass of the film, preferably, 0.1 % and 10.0 % with respect to the mass of the film.
21.The film as claimed in claim 15, wherein the processing aid is at least one selected from the group consisting of anti-blocking/slipping agents, antistatic agents, lubricants, release agents, anti-sticking agents and melt strength/viscosity balancing agents.
22.The film as claimed in claim 15, wherein the stabilizer is at least one selected from the group consisting of polymer and soyabean stabilizer.

23.The film as claimed in claim 15, wherein the PVC film is rigid.
24. A blister container for packing pharmaceutical products made using the film in accordance with claim 15.