1. A coating composition for applying on polyester film capable of printing on all types of electrostatic printers comprising: a combination of polyethylene carboxylic acid dispersion and homopolymer or copolymer of polyacrylate dispersion and/or homopolymer or copolymer of polyvinyl acetate dispersion; wherein acrylate and/or acetate content is in the range of 1 to 50% of carboxylic acid content in the dispersion.

2. The coating composition as claimed in claim 1, wherein preferable range of acrylate and/or acetate content is 5 to 30% of carboxylic acid content in the dispersion.

3. The coating composition as claimed in claim 1, wherein carboxylic acid in polyethylene carboxylic acid dispersion is selected from acrylic acid, methacrylic acid, ethacrylic acid, propyl acrylic acid, butyl acrylic acid, hexyl acrylic acid, octyl acrylic acid and other higher acids having carbon chain length upto C15 or combination thereof.

4. The coating composition as of claim 1, wherein polyvinyl acetate is homopolymer or copolymer of methyl acetate, butyl acetate or higher acetates having carbon chain length upto C15 or combination thereof.

5. The coating composition as claimed in claim 1, wherein polyacrylate is homopolymer or copolymer of methylacrylate, ethylacrylate, methylmethacrylate, ethylethacrylate, n-butyl acrylate, butyl methacyrlate, hexyl acrylate, hexyl methacrylate or higher acrylates having carbon chain length upto C15 carbon atom or combination thereof.

6. The coating composition as clamed in claim 1, wherein optionally known static agent is added in the composition. 25

7. A polyester film is coated by coating composition as claimed in claims 1 to 5.

8. The polyester film as claimed in claim 6 is capable of printing on all types of (electrostatic) printers with liquid and dry toners.

9. The polyester film as claimed in claim 6 is either uniaxially oriented or biaxially oriented.

10. The polyester film as clamed in claim 6 is single or multilayer, extruded or coextruded film.

11. The polyester film as clamed in claim 6 is transparent, translucent, white, opaque, matte, glossy, hazy or milky white or metalized polyester film.

12. The polyester film as clamed in any of the preceding claims, wherein the coating is carried out inline or offline.

13. The polyester film as clamed in any of the preceding claims having ash pick up in static charge testing is not more than 15% of the film surface area. Dated this 31st day of July, 2014 RANJANA SINGH OF K & S PARTNERS

COATING COMPOSITION FOR POLYESTER FILM
FIELD OF THE INVENTION
The present invention relates to a coating composition for polyester film capable of
printing on all types of electrostatic printers with liquid and dry toners. The coating
composition is a combination of polyethylene carboxylic acid dispersion and
homopolymer or copolymer of polyacrylate dispersion or homopolymer or copolymer of
polyvinyl acetate dispersion.
BACKGROUND AND PRIOR ART OF THE INVENTION
Digital printing is an effective method of image transfer which is currently getting
popular as it automates and streamlines the printed image without much operator
intervention. Image is formed on the imaging surface by use of a uniform electrostatic
charge distribution throughout the surface. The electrostatic charge can be created by the
corona and the print image is developed by applying toner which adhere to the surface
and develop the image. Common digital printing presses available in market are from HP
indigo, Kodak, Xerox, Canon, Ricoh, Konica etc.
Digital printers usually use either liquid or dry toners for printing. Liquid ink is used by
HP indigo. HP indigo follows offset process where ink is transferred from photo imaging
cylinder to offset cylinder and then to the substrate. Dry toner based ink is used by
Konica Minolta and Xerox Digital. Konika Minolta talks about using low temperature
fusion Simitri HC toners to give a offset finish where fixing temperature requires to be as
low as 150°C as mentioned in their US patent no 8304157 and Xerox uses low melt EA
(Emulsion Aggregrates) dry ink technology which also fuses with substrate at low
temperature.
It is well known that electrostatic properties depend upon the nature of the substrate. For
any machine working by electrostatic function, electrostatic properties are of atmost
importance. It is well known fact if any substrate comes in contact with any other
substrate or material coefficient of friction, static properties etc are important to
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determine the easy movability of the substrate. These properties can be easily determined
by simple testing instruments.
Substrates to be printed are fed into the printing press in either sheet form or in roll form.
In sheet form, the sheets are put in a tray and sheets either slide or are picked one by one
or any other method known in the art and sent to the printing section for printing. For
easy sliding and picking, minimization of static charge is of foremost importance. If the
substrate has high static, it will not slide easily or be picked up easily or multiple sheet
will be picked or slide together. In roll form, the substrate from the unwinder moves to
printer and after printing rolls move to the winder roll. The substrate is later further
processed as per requirement.
The US Patent no. 7279513 describes coatings for paper consisting of Ethylene Acrylic
Acid (EAA) for digital printing. This patent specifically discloses EAA coating over
paper only and fails to disclose combination of EAA and vinyl acetates or acrylates
coatings be applied over the oriented polyester film. A drawback of using EAA coating
over film is of static charge. EAA has high static charge hence, cannot be used in all
types of digital printing processes due to poor runability. EAA Coated films are coated by
off-line method and EAA coating has been mentioned only for HP Indigo printers which
use liquid toners.
It is an object of the present invention to overcome the difficulties presently encountered
in the art of providing the coated oriented polyester film which is capable of receiving
both liquid as well as dry toners on all types of the printers.
(Need rephrasing)The inventive film exhibits properties that are significantly different
from those of another coated polyester film where the film is coated by acrylic,
copolyester or polyurethanes. The other coated polyester films are printed by using
engraved cylinders. The inventive film is used for electrostatic printing. In the
electrostatic printing process, the printing is done by means of electrostatic charge. The
present invention relates to an oriented polyester film, having electrostatic printing
characteristics and is capable of printing on all types of electrostatic printers with liquid
4
and dry toners such as Xerox iGen digital printing press, digital indigo HP ink systems,
Ricoh Digital Press, Canon digital press, Kodak Digital press etc.
OBJECTIVES OF THE INVENTION
The primary objective of the present invention is to provide a coating composition for
polyester film to print on electrostatic printers.
Another objective of the present invention is to provide a coated polyester film that is
capable of printing on all types of electrostatic printers with liquid and dry toners.
Yet another objective of the present invention is to provide a coated polyester film where
the coating is done either inline i.e. during process of film formation or offline i.e. after
film formation.
Yet another objective of the present invention is to provide a coated polyester film for
reducing static charge on the said film, so as to pick an individual film one by one by the
printer while printing and is capable of printing on all types of printers.
Yet another objective of the present invention is to provide a method for preparation of
coated polyester film where the said coated polyester film is used as a substrate for all
commercially available digital printing machines.
SUMMARY OF THE INVENTION
The present invention relates to a coating composition for applying on polyester film
capable of printing on all types of electrostatic printers comprising a combination of
polyethylene carboxylic acid dispersion and homopolymer or copolymer of polyacrylate
dispersion and/or homopolymer or copolymer of polyvinyl acetate dispersion, wherein
acrylate and/or acetate content is in the range of 1 to 50% of carboxylic acid content in
the dispersion mixture. The present invention also relates to an oriented polyester film
coated by above said coating composition that is capable of printing on all types of
(electrostatic) printers with liquid and dry toners. The present invention further relates to
the process of achieving the coated polyester film. The present invention also relates to
5
coating process where the coating composition is capable of coating by inline as well as
offline method. The present invention further relates to printing process, so the printing
machine pick an individual film one by one while printing and /or so as to be printed in
roll form.
DETAILED DESCRIPTION OF THE INVENTION
While the invention is susceptible to various modifications and alternative forms, specific
aspect thereof has been shown by way of example and will be described in detail below.
It should be understood, however that it is not intended to limit the invention to the
particular forms disclosed, but on the contrary, the invention is to cover all modifications,
equivalents, and alternative falling within the spirit and the scope of the invention.
The Applicants would like to mention that the examples are mentioned to show only
those specific details that are pertinent to understanding the aspects of the present
invention so as not to obscure the disclosure with details that will be readily apparent to
those of ordinary skill in the art having benefit of the description herein.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to
cover a non-exclusive inclusion, such that a process that comprises a list of components
does not include only those components but may include other components not expressly
listed or inherent to such process. In other words, one or more elements in a system or
process proceeded by “comprises… a” does not, without more constraints, preclude the
existence of other elements or additional elements in the system or process.
Accordingly, the present invention in one aspect relates to coating composition for
applying on polyester film for printing on electrostatic printers where electrostatic printer
uses liquid or dry toners so as to pick an individual film one by one by the printer while
printing or so as to be printed in roll form and is capable of printing on all types of
printers.
In another aspect of the invention it relates to a coating composition for applying on
polyester film capable of printing on all types of electrostatic printers comprising a
combination of polyethylene carboxylic acid dispersion and homopolymer or copolymer
of polyacrylate dispersion and/or homopolymer or copolymer of polyvinyl acetate
6
dispersion, wherein acrylate and/or acetate content is in the range of 1 to 50% of
carboxylic acid content in the dispersion.
In yet another embodiment of the invention the preferable range of acrylate and/or acetate
content is 5 to 30% of carboxylic acid content in the dispersion.
In yet another embodiment of the invention the carboxylic acid in polyethylene
carboxylic acid dispersion is selected from but not limited to acrylic acid, methacrylic
acid, ethacrylic acid, propyl acrylic acid, butyl acrylic acid, hexyl acrylic acid, octyl
acrylic acid and other higher acids having carbon chain length upto C15 or combination
thereof.
In another embodiment of the invention the polyvinyl acetate is homopolymer or
copolymer of methyl acetate, butyl acetate or higher acetates having carbon chain length
upto C15 carbon atom or combination thereof
In yet another embodiment of the invention the vinyl acetate dispersions are selected
from the group such as VEOVA or other copolymers like Vinyl acrylate – Ethylene
copolymer, Vinyl acrylate – VEOVA copolymer, Vinyl acetate acrylic copolymer, Vinyl
acetate – Vinyl Chloride copolymers, Vinyl acetate – Acrylamide copolymers, Vinyl
Acetate – Butyl Acetate copolymers, vinyl acetate dibutyl maleinate copolymer, Vinyl
Acetate – 2 Ethyl Hexyl Acrylate copolymer
In yet another embodiment of the invention the polyacrylate is homopolymer or
copolymer of methylacrylate, ethylacrylate, methylmethacrylate, ethylethacrylate, n-butyl
acrylate, butyl methacyrlate, hexyl acrylate, hexyl methacrylate or higher acrylates
having carbon chain length upto C15 carbon atom or combination thereof.
In yet another embodiment of the invention the acrylate and/or acetate content is
preferably in the range of 2 to 30% of carboxylic acid content in the dispersion.
In yet another embodiment of the invention optionally known anti-static agent is added in
the composition. The anti-static agent is to be added singly by itself or in combination
with other antistatic agents, in the weight percent of 0.01 – 50 wt% of the coating
7
solution. The common antistatic agents used are long chain aliphatic amines, amides,
quaternary ammonical salts, esters of phosphoric acid, polyethylene glycol esters or
polyols, indium tin oxides, conductive polymers like PEDOT:PSS and nanofibers like
polyaniline nanofibers.
Another aspect of the invention a polyester film coated by coating composition
comprising a combination of polyethylene carboxylic acid dispersion and homopolymer
or copolymer of polyacrylate dispersion and/or homopolymer or copolymer of polyvinyl
acetate dispersion, wherein acrylate and/or acetate content be is in the range of 1 to 50%
of carboxylic acid content in the dispersion.
In another embodiment of the invention, the coating can be applied has solid content
below 20wt% most preferably below 10wt%.
In another embodiment of the invention the viscosity of the coating sision be below 40
sec and above 5 sec measured by ford cup.
In another embodiment of the invention the polyester film is capable of printing on all
types of (electrostatic) printers with liquid and dry toners.
In another embodiment of the invention the polyester film is either uniaxially oriented or
biaxially oriented.
In another embodiment of the invention the polyester film is single or multilayer,
extruded or coextruded film.
In another embodiment of the invention the polyester film is transparent, translucent,
white, opaque, matte, glossy, hazy, milky white or metallized polyester film.
In another embodiment of the invention the coating is carried out inline or offline on the
polyester film.
In another embodiment of the invention, the coating can be applied by inline or offline
method.
8
In inline coating process the composition is applied such that it orients as the film orients
without producing any cracks in the coating and can withstand the orientation or heat set
conditions which are necessary to produce oriented films.
In offline coating process the coating is applied after film production in separate set of
machine. Inline or offline coating can be applied either in one side or both sides of the
polyester film.
In another embodiment of the invention the polyester film is having ash pick up in static
charge testing is not more than 15% of the film surface area.
In another embodiment of the invention the coated polyester film is handled in both sheet
form and roll form.
In another embodiment of the invention the polyester film is coated either one side or
both side and coated film is used for electrostatic printing.
A process of making polyester film comprising the steps of:
a) allowing dicarboxylic acid and alkylene glycol to react along with additives to
obtain molten polyester, having Tg between 55°C to 80°C.
b) molten polyester is either directly extruded through the die or converted to
chips. These chips either singly or in combination with other additive chips
are extruded to form molten polyester which is sent through the die.
c) molten polyester through a die is quenched on chilled rollers in order to obtain
polyester film,
d) the polyester film obtained in step (c) is subjected to orienting and heating
simulataneiusly such that the said film in biaxial oriented.
Polyester film thus obtained is in the form of substantially amorphous single layer or
multilayer prefilm; this film is then reheated and oriented in sequential biaxial orientation
or a simultaneous biaxial orientation. Stretch ratio is in the range of 1.5 to 4.5,
determined by a rotation speed ratio of a heated slow-driving roll (upstream) and heated
quick-driving roll (downstream). With respect to stretching in a transverse direction
(TD), stretching conditions require a stretch ratio of about 3.0 to 5.0 using a tenter
9
wherein both ends of the film are fixed with clips. The temperature maintained during
stretching conditions is as below.
-60°C ≤ ΔTMC - TSMD ≤ 100°C and
-80°C ≤ ΔTMC – TSTD ≤ 90°C and
-25°C ≤ TSTD - ΔTCG ≤ 80°C and
-35°C ≤ TSMD - ΔTCG ≤ 60°C and
65°C ≤ TP – ΔTCG ≤ 210°C and
0°C ≤ ΔTP – TMC ≤ 210°C
Where,
ΔTMC = Difference between melting temperature and crystallization
temperature
ΔTCG = Difference between crystallization temperature and glass
transition temperature
TSMD = Stretching temperature in machine direction
TSTD = Stretching temperature in transverse direction
TP = Heat set temperature
The extrusion of polyester is carried out at a temperature in the range of 250°C to 300°C.
Further, in step (c) the quenching is carried out on chilled roll at a temperature in the
range of 30°C to 50°C below Tg of the polyester film.
In yet another embodiment of the invention the polyester film optionally contains suitable
additives such as but not limited to antiblocking agents, antioxidants, stabilizers and other
additives; which may be contained individually or as combination.
10
Dicarboxylic acid and alkylene glycol for making polyester film are mixed in the ratio of
1:0.3 to 1:0.5 along with the additives like are antiblocking agents, antioxidants,
stabilizers and other suitable compounds that are required for the film production.
Dicarboxylic acid is selected from but not limited to terephthalic acid or dimethyl
terephthalate either used singly or combination with two or more components which may
be 2,6 naphthalene diacrboxylic acid, isophthalic acid, and phthalic acid, aliphatic
dicarboxylic acid like adipic acid or ester of same.
Alkylene glycol is selected from but not limited to ethylene glycol either used singly or in
combination with two or more component which compises of diethylene glycol,
propylene glycol, butanediol, hexanediol, neopentyl glycol, trans-1,4 cyclohexanediol
and cis-1,4-cyclohexanediol
Furthermore, the polyester film of the present invention is heat-set for about 1.0-20
seconds in a rear room of a tenter at temperature above 180° C
In yet another aspect of the present invention the polyester film is transparent, white,
opaque, matte, glossy, hazy, milky white, translucent, metalized etc. These films other
than metalized film are obtained by usual method by adding suitable compounds like
silica, titanium dioxide, barium sulphate, calcium carbonate, aluminum oxide, cosslinked
polystyrene, cosslinked PMMA, zeolites and other silicates. The quantities generally used
for these compounds are in the range of 0.01 to 30 wt% of any of these components either
singly or in combinations as desired. The transparent films have light transmission value
as high as 95% on other hand opaque film have opacity as high as 99.9%. The metalized
film is be obtained by metalizing the transparent or opaque film in metalizer by
conventional known process.
In yet another embodiment of the invention the thickness of oriented film of the invention
is in the range of 1 to 500 micron, more preferably 6 to 450 micron, most preferably 8 to
400 micron.
In yet another embodiment of the invention the base film is either a single layer or multilayer.
The film structure may be A or ABC type A mentions the single layer film; and
11
type ABC mentions multilayer film, where B is the base layer and A and C are outer
layer, where A and C can be same or different from each other; or A and/or C can be
same as that of B or different from B. The thickness of outer layer can be in range of
0.01% to 30% preferably of 0.05% to 20% thickness.
In another aspect of the present invention the film is coated with aqueous dispersion of
poly ethylene copolymer, where ethylene copolymer dispersions can be used singly as
ethylene copolymer dispersion or as a mixture of different ethylene copolymer
dispersions or a mixture of ethylene copolymer dispersions with poly vinyl acetate
dispersion and / or Poly acrylate dispersions. Polyvinyl acetate dispersion and / or
polyacrylate dispersions, either homopolymer or copolymer to keep viable electropolarity
for easy processing and printing of the substrate.
In another embodiment of the present invention the ethylene copolymer dispersions used
are polyethylene carboxylic acid with polyacrylates and/or vinyl acetates homopolymers
or copolymers. The addition of homopolymer or copolymer of polyacrylates and/or vinyl
acetates to poly ethylene carboxylic acid dispersions allows both liquid and dry toner to
adhere to the coated polyester film and yet control the surface friction which is owned
due to its electrostatic attraction between the surface for good processability and
runnability of the polyester film. The weight percentage of combination of poly acrylate
and / or poly vinyl acetates homopololymer or copolymer where the acetates and / or
acrylates groups be used upto 50% most preferably upto 40wt% of acrylic acid content in
the mixture.
In another embodiment of the present invention the ethylene copolymers dispersions that
can be used are ethylene carboxylic copolymers where carboxylic are selected from
acrylic acid, methacrylic acid, ethacrylic acid, propyl acrylic acid, butyl acrylic acid,
hexyl acrylic acid, octyl acrylic acid and other higher acids upto C12 carbon atom; The
vinyl acetate dispersions can be homopolymer or copolymer of Polyvinyl acetates or
higher acetates groups where higher acetates gropus be butyrate, propyrates, hexylrates or
higher upto C15 carbon atom like VEOVA, other copolymers like Vinyl acrylate –
12
Ethylene copolymer Vinyl acrylate – VEOVA copolymer, Vinyl acetate acrylic
copolymer, Vinyl acetate – Vinyl Chloride copolymers, Vinyl acetate – Acrylamide
copolymers, Vinyl Acetate – Butyl Acetate copolymers, vinyl acetate dibutyl maleinate
copolymer, Vinyl Acetate – 2 Ethyl Hexyl Acrylate copolymer etc can also be used.
Acrylate polymers used be homopolymers of polymethylacrylates, polyethylacrylates,
polymethmethacrylates, polyethylethacrylates etc or higher acrylates upto C15 carbon
atom, or copolymers of ethylene acryaltes, where acrylates are selected from the group
consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, nbutyl
acrylate, butyl methacyrlate, hexyl acrylate, hexyl methacrylate and higer acrylates
or its copololymers with ethylene. Ethylene copolymers that are preferred are Ethylene
acrylic acid copolymer and vinyl acetate and / or acrylate hompolymers or copolymers.
Ethylene acrylic copolymer has been used for printing with Digital printers operating on
liquid based toners but when Ethylene Acrylic Acid copolymer is used in combination
with vinyl acetate ethylene copolymer and /or polyvinyl acetate imparts good printing
property with liquid based toners as well as dry toners. Ethylene Acrylic acid dispersions
used are stabilized by alkali or alkaline metal salts or ammonia.
In another embodiment of the present invention a combination of polyethylene acrylic
acid dispersion with polyvinylacetate homopolymer or copolymer dispersions and / or
polyacrylate homo polymer or copolymers such that the weight percentage of ethylene
acrylic acid polymer varies from 1% to 99% more preferably from 10% to 90% and
weight percentage of poly vinyl acetate homopolymer or copolymer dispersions and / or
acrylate homo polymer or copolymers varies preferably from 1 % to 50% and most
preferably from 2% to 30% of acrylic acid content in the polymer mixture.
In another embodiment of the present invention the polythylene acrylic acid used has
acrylic acid content in range of 10 to 30 wt% most preferably in range of 12 to 25 wt%.
The ethylene vinyl acetate dispersion used is having Tg of -30 to 20 deg C, most
preferably Tg of 5 – 15 deg C. VAE dispersion used are having Tg of 6 to -20 deg C.
13
In another embodiment of the present invention the coating composition as applied has
solid content below 20wt% and the viscosity of the coating solution is below 40 sec and
above 5 sec measured by ford cup. The coating composition is such that it can be applied
by inline or offline coating method. The coating can be applied single side or both side of
polyester film surface.
It is to be noted that the film of the present invention with the aforesaid characteristics
exhibits electrostatic printing property which can be employed by both liquid and dry
toner based digital printing systems and is totally different than that of usual coated
polyester films.
Characterization of coated polyester film
Coefficient of Friction
Coefficient of Friction is checked by llyod (UK) having model No FT/230.
Fine ash pick up
Static charge is checked by Cigarette ash pickup method. Higher the surface static
change, higher will be dust pickup. Fresh cigarette is put in a petridish. Film is put just
above the petridish. The ash picks up and covers the film surface. The ash pickup is
checked by pantograph method. Higher the surface area covered, higher the electro
polarity of the film.
Printability
Printability of the coated polyester film is checked on both liquid toner based digital
printer (HP Indigo) and Dry toner based digital printers (Xerox iGen3 and Konica
Minolta C70hc). Tape test with 3m Scotch tape is used for checking the adhesion of print
over the film surface.
14
Run ability:
Runability of the coated polyester film is checked on both liquid toner based digital
printer (HP Indigo) and Dry toner based digital printers (Xerox iGen3 and Konica
Minolta C70hc)
Bonding with EVA film
The printed film is bonded with EVA film to protect the print over the substrate.
EXAMPLES
The following examples are given to illustrate the present invention and should not be
construed to limit the scope of the present invention.
Preparation of Ethylene Acrylic Acid dispersion
In a 1000 ml reactor equipped with stirrer, thermocouple, pressure gauge and release
value, 30 gms of ethylene acrylic acid copolymer having acrylic acid component of
20wt% as available from PRIMACOR 5980I is mixed with 165 gms of deionized water
4.5 gms of DMEA. The reactor is then closed and temperature of 120°C (max 130°C) is
maintained for 3 hours with agitation. The dispersion formed is clear to milky white in
appearance and termed as EAA-1. Dispersion of ESCOR 5200 is also prepared in the
similar manner and termed as EAA-2.
Example 1
Coating composition prepared by combining EAA-1 along with VAE -1, such that VAE-
1 is kept at 25wt% of ethylene acrylic acid.
Example 2
Coating composition prepared by combining EAA-1 along with VAE -1, such that VAE-
1 is kept at 15wt% of ethylene acrylic acid.
Example -3
Coating composition prepared by combining EAA-1 along with VAE -1, such that VAE-
1 is kept at 10wt% of ethylene acrylic acid.
Example -4
15
Coating composition prepared by combining EAA-1 along with VAE -2, such that VAE-
1 is kept at 25wt% of ethylene acrylic acid.
Example -5
Coating composition prepared by combining EAA-1 along with VAE -2, such that VAE-
1 is kept at 15wt% of ethylene acrylic acid.
Example -6
Coating composition prepared by combining EAA-1 along with VAE -2, such that VAE-
1 is kept at 5wt% of ethylene acrylic acid.
Example 7
Coating composition prepared by combining EAA-2 along with VAE -1, such that VAE-
1 is kept at 25wt% of ethylene acrylic acid.
Example 8
Coating composition prepared by combining EAA-2 along with VAE -1, such that VAE-
1 is kept at 15wt% of ethylene acrylic acid.
Example -9
Coating composition prepared by combining EAA-2 along with VAE -1, such that VAE-
1 is kept at 5wt% of ethylene acrylic acid.
Example -10
Coating composition prepared by combining EAA-2 along with VAE -2, such that VAE-
1 is kept at 25wt% of ethylene acrylic acid.
Example -11
Coating composition prepared by combining EAA-2 along with VAE -2, such that VAE-
1 is kept at 15wt% of ethylene acrylic acid.
Example -12
Coating composition prepared by combining EAA-2 along with VAE -2, such that VAE-
1 is kept at 5wt% of ethylene acrylic acid.
Example 13
Coating composition prepared by combining EAA-1 along with PVAc -1, such that
PVAc-1 is kept at 20wt% of ethylene acrylic acid.
Example 14
16
Coating composition prepared by combining EAA-1 along with PVAc -1, such that
PVAc-1 is kept at 10 wt% of ethylene acrylic acid.
Example -15
Coating composition prepared by combining EAA-1 along with PVAc -1, such that
PVAc-1 is kept at 5wt% of ethylene acrylic acid.
Example -16
Coating composition prepared by combining EAA-2 along with PVAc -1, such that
PVAc-1 is kept at 20wt% of ethylene acrylic acid.
Example -17
Coating composition prepared by combining EAA-2 along with PVAc -1, such that
PVAc-1 is kept at 10wt% of ethylene acrylic acid.
Example -18
Coating composition prepared by combining EAA-2 along with PVAc -1, such that
PVAc-1 is kept at 5wt% of ethylene acrylic acid.
Example 19
Coating composition prepared by combining EAA-1 along with VAEVC -1, such that
VAEVC -1 is kept at 30wt% of ethylene acrylic acid.
Example 20
Coating composition prepared by combining EAA-1 along with VAEVC -1, such that
VAEVC-1 is kept at 20 wt% of ethylene acrylic acid.
Example -21
Coating composition prepared by combining EAA-1 along with VAEVC -1, such that
VAEVC-1 is kept at 10wt% of ethylene acrylic acid.
Example -22
Coating composition prepared by combining EAA-2 along with VAEVC -1, such that
VAEVC-1 is kept at 30wt% of ethylene acrylic acid.
Example -23
Coating composition prepared by combining EAA-2 along with VAEVC -1, such that
VAEVC -1 is kept at 10wt% of ethylene acrylic acid.
Example -24
17
Coating composition prepared by combining EAA-2 along with VAEVC -1, such that
VAEVC-1 is kept at 10wt% of ethylene acrylic acid.
Example 25
Coating composition prepared by combining EAA-1 along with AD, such that AD is kept
at 30wt% of ethylene acrylic acid.
Example 26
Coating composition prepared by combining EAA-1 along with AD, such that AD is kept
at 20 wt% of ethylene acrylic acid.
Example -27
Coating composition prepared by combining EAA-1 along with AD, such that AD is kept
at 10wt% of ethylene acrylic acid.
Example -28
Coating composition prepared by combining EAA-2 along with AD, such that AD is kept
at 30wt% of ethylene acrylic acid.
Example -29
Coating composition prepared by combining EAA-2 along with AD, such that AD is kept
at 10wt% of ethylene acrylic acid.
Example -30
Coating composition prepared by combining EAA-2 along with AD, such that AD is kept
at 10wt% of ethylene acrylic acid.
Example 31
Coating composition prepared by combining EAA-1 along with AAVAEA -1, such that
AAVAEA -1 is kept at 40wt% of ethylene acrylic acid.
Example 32
Coating composition prepared by combining EAA-1 along with AAVAEA -1, such that
AAVAEA -1 is kept at 30 wt% of ethylene acrylic acid.
Example -33
Coating composition prepared by combining EAA-2 along with AAVAEA -1, such that
AAVAEA -1 is kept at 40wt% of ethylene acrylic acid.
Example -34
18
Coating composition prepared by combining EAA-2 along with AAVAEA -1, such that
AAVAEA -1 is kept at 30wt% of ethylene acrylic acid.
Example -35
Coating composition prepared by combining EAA-1 along with VAE -1, such that VAE-
1 is kept at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -36
Coating composition prepared by combining EAA-1 along with VAE -2, such that VAE-
1 is kept at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -37
Coating composition prepared by combining EAA-1 along with VAE -2, such that VAE-
1 is kept at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -38
Coating composition prepared by combining EAA-2 along with VAE -2, such that VAE-
2 is kept at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -39
Coating composition prepared by combining EAA-1 along with PVAc 1, such that PVAc
1 is kept at 2wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -40
Coating composition prepared by combining EAA-2 along with PVAc 1, such that PVAc
1 is kept at 2wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -41
Coating composition prepared by combining EAA-1 along with VAEVC 1, such that
VAEVC 1 is kept at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
19
Example -42
Coating composition prepared by combining EAA-2 along with VAEVC 1, such that
VAEVC 1 is kept at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -43
Coating composition prepared by combining EAA-1 along with AD, such that AD is kept
at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total composition.
Example -44
Coating composition prepared by combining EAA-2 along with AD, such that AD is kept
at 5wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total composition.
Example -45
Coating composition prepared by combining EAA-1 along with AAVAEA 1, such that
AAVAEA 1 is kept at 8wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Example -46
Coating composition prepared by combining EAA-2 along with AAVAEA 1, such that
AAVAEA 1 is kept at 8wt% of ethylene acrylic acid and antistatic is kept 1.0wt% of total
composition.
Comparative Example 1
Coating is prepared by containing only EAA-1 copolymer dispersion.
Comparative Example 2
Coating is prepared by containing only EAA-2 copolymer dispersion.
Comparative Example 3
Coating composition prepared by combining EAA-1 along with VAE -1, such that VAE-
1 is kept at 60 wt% of ethylene acrylic acid.
Comparative Example 4
Coating composition prepared by combining EAA-1 along with VAE -2, such that VAE-
2 is kept at 70 wt% of ethylene acrylic acid.
20
Comparative Example 5
Coating composition prepared by combining EAA-1 along with PVAc - 1, such that
PVAc - 1 is kept at 55 wt% of ethylene acrylic acid.
Comparative Example 6
Coating composition prepared by combining EAA-1 along with VAEVC, such that
VAEVC is kept at 60 wt% of ethylene acrylic acid.
Comparative Example 7
Coating composition prepared by combining EAA-1 along with BA, such that BA is kept
at 60 wt% of ethylene acrylic acid.
Comparative Example 8
Coating composition prepared by combining EAA-1 along with AAVAEA, such that
AAVAEA is kept at 55 wt% of ethylene acrylic acid.
Table 1: Coating composition with various components
Ex.
No. EAA 1 EAA 2 VAE 1 VAE 2 PVAc 1 VAEVC AD AAVAEA
Anti
static
agent
1 100 25
2 100 15
3 100 10
4 100 25
5 100 15
6 100 5
7 100 25
8 100 15
9 100 5
10 100 25
11 100 15
12 100 5
13 100 25
14 100 10
15 100 5
16 100 20
17 100 10
18 100 5
19 100 30
20 100 20
21
21 100 10
22 100 30
23 100 20
24 100 10
25 100 25
26 100 10
27 100 5
28 100 20
29 100 10
30 100 5
31 100 20
32 100 15
33 100 20
34 100 15
35 100 5 1
36 100 5 1
37 100 5 1
38 100 5 1
39 100 2 1
40 100 2 1
41 100 5 1
42 100 5 1
43 100 10 1
44 100 10 1
45 100 8 1
46 100 8 1
CE 1 100
CE 2 100
CE 3 100 60
CE 4 100 70
CE 5 100 55
CE 6 100 60
CE 7 100 60
CE 8 100 55
22
Table 2: Test results for coating composition with various components
Ex
No COF Static
Fine
Ash
Pickup
Dry Toner
Printability
Wet Toner
Printability
Dry Toner
Run ability
Wet Toner
Run ability
Laminate with
EVA film (gm)
1 0.4 ok 0-5 OK ok Ok Ok 400-450
2 0.41 ok 0-5 OK ok Ok Ok 425-460
3 0.41 ok 2-8, OK ok Ok Ok 370-430
4 0.4 ok 0-5 OK ok Ok Ok 450-480
5 0.42 ok 0-5 OK ok Ok Ok 400-450
6 0.42 ok 2-8, OK ok Ok Ok 380-430
7 0.4 ok 4-8. OK ok Ok Ok 410-460
8 0.41 ok 4-8. OK ok Ok Ok 370-450
9 0.41 ok 6-15. OK ok Ok Ok 370-410
10 0.4 ok 0-5 OK ok Ok Ok 430-470
11 0.42 ok 3-7. OK ok Ok Ok 400-450
12 0.42 ok 4-9. OK ok Ok Ok 400-430
13 0.42 ok 0-8. OK ok Ok Ok 500-570
14 0.43 ok 5-10. OK ok Ok Ok 440-500
15 0.43 ok
10-
15. OK ok Ok Ok 410-440
16 0.41 ok 0-5 OK ok Ok Ok 470-530
17 0.43 ok 0-5 OK ok Ok Ok 410-460
18 0.43 ok 6-9. OK ok Ok Ok 360-410
19 0,42 ok 5-8. OK ok Ok Ok 370-420
20 0.42 ok 8-10. OK ok Ok Ok 350-400
21 0.42 ok 7-14. OK ok Ok Ok 320-380
22 0.43 ok 2-6. OK ok Ok Ok 350-400
23 0.43 ok 1-8. OK ok Ok Ok 330-370
24 o,46 ok 8-15. OK ok Ok Ok 330-350
25 0.42 ok 4-8. OK ok Ok Ok 380-440
26 0.43 ok 4-9. OK ok Ok Ok 350-400
27 0.43 ok 5-9. OK ok Ok Ok 320-380
28 o,46 ok 4-8. OK ok Ok Ok 350-400
29 0.44 ok 4-9. OK ok Ok Ok 330-370
30 0.45 ok 5-9. OK ok Ok Ok 330-350
31 0.45 ok 8-15. OK ok Ok Ok 420-470
32 0.45 ok
12-
15. OK ok Ok Ok 400-460
23
33 0.44 ok 5-10. OK ok Ok Ok 400-450
34 0.45 ok 7-16. OK ok Ok Ok 350-430
35 0.43 ok 0-5 OK ok Ok Ok 350-370
36 0.44 ok 0-5 OK ok Ok Ok 330-370
37 0.46 ok 0-5 OK ok Ok Ok 350-370
38 0.42 ok 0-5 OK ok Ok Ok 330-370
39 0.42 ok 0-5 OK ok Ok Ok 410-490
40 0.45 ok 0-5 OK ok Ok Ok 370-430
41 0.46 ok 0-5 OK ok Ok Ok 400-450
42 0.43 ok 0-5 OK ok Ok Ok 330-380
43 0.41 ok 0-5 OK ok Ok Ok 400-450
44 0.43 ok 0-5 OK ok Ok Ok 330-380
45 0.43 ok 0-5 OK ok Ok Ok 400-450
46 0.42 ok 0-5 OK ok Ok Ok 340-390
CE 1 0.51
Not
OK 70-80 Not OK ok Not OK Ok 200-230
CE 2 0.53
Not
OK 60-70 Not OK ok Not OK Ok 200-230
CE 3 0.65 OK 5-9, Not OK Not OK Not OK Not OK 55 - 100
CE 4 0.64 OK 5-9. Not OK Not OK Not OK Not OK 55 - 100
CE 5 Tacki
ness
CE 6 Tacki
ness
CE 7 0.45 OK 3-7. Not OK Not OK OK OK 55 - 100
CE 8 Tacki
ness
24
WE CLAIM:
1. A coating composition for applying on polyester film capable of printing on all
types of electrostatic printers comprising:
a combination of polyethylene carboxylic acid dispersion and
homopolymer or copolymer of polyacrylate dispersion and/or homopolymer or
copolymer of polyvinyl acetate dispersion;
wherein acrylate and/or acetate content is in the range of 1 to 50% of
carboxylic acid content in the dispersion.
2. The coating composition as claimed in claim 1, wherein preferable range of
acrylate and/or acetate content is 5 to 30% of carboxylic acid content in the
dispersion.
3. The coating composition as claimed in claim 1, wherein carboxylic acid in
polyethylene carboxylic acid dispersion is selected from acrylic acid, methacrylic
acid, ethacrylic acid, propyl acrylic acid, butyl acrylic acid, hexyl acrylic acid,
octyl acrylic acid and other higher acids having carbon chain length upto C15 or
combination thereof.
4. The coating composition as of claim 1, wherein polyvinyl acetate is homopolymer
or copolymer of methyl acetate, butyl acetate or higher acetates having carbon
chain length upto C15 or combination thereof.
5. The coating composition as claimed in claim 1, wherein polyacrylate is
homopolymer or copolymer of methylacrylate, ethylacrylate, methylmethacrylate,
ethylethacrylate, n-butyl acrylate, butyl methacyrlate, hexyl acrylate, hexyl
methacrylate or higher acrylates having carbon chain length upto C15 carbon
atom or combination thereof.
6. The coating composition as clamed in claim 1, wherein optionally known static
agent is added in the composition.
25
7. A polyester film is coated by coating composition as claimed in claims 1 to 5.
8. The polyester film as claimed in claim 6 is capable of printing on all types of
(electrostatic) printers with liquid and dry toners.
9. The polyester film as claimed in claim 6 is either uniaxially oriented or biaxially
oriented.
10. The polyester film as clamed in claim 6 is single or multilayer, extruded or
coextruded film.
11. The polyester film as clamed in claim 6 is transparent, translucent, white, opaque,
matte, glossy, hazy or milky white or metalized polyester film.
12. The polyester film as clamed in any of the preceding claims, wherein the coating
is carried out inline or offline.
13. The polyester film as clamed in any of the preceding claims having ash pick up in
static charge testing is not more than 15% of the film surface area.
Dated this 31st day of July, 2014
RANJANA SINGH
OF K & S PARTNERS