FORM 2
THE PATENTS ACT. 1970
(39 OF 1970)
AND
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
[SECTION 10; RULE 13]
"A PROCESS OF MANUFACTURING BIO-BASED HYBRID ADVANCED COMPOSITES AND PRODUCT THEREOF"
APPLICANT : SP Advanced Engineering Materials Private Limited
NATIONALITY: Indian Company
ADDRESS : 70, Nagindasmaster Road, Fort, Mumbai 400 005,
Maharashtra, India
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED:

FIELD OF INVENTION:
The present invention relates to a process of manufacturing bio-based hybrid advanced composites and composites thereof.
Particularly, the invention relates to a process of manufacturing bio-based hybrid advanced composites made out of fibers grafted with elastic polymers or monomers.
BACKGROUND OF THE INVENTION:
There is an increasing demand for use of natural, biodegradable and/or eco-friendly fibers. Such fibers are a low-density material yielding relatively lightweight composites with high interfacial properties. These fibers not only have significant cost advantages and ease of processing but are a highly renewable resource.
Dry jute fibers are known for their strength and are affordable as well as sustainable fibers. Various chemically treated natural fibers are widely known in art. Rubberized jute fiber is one of them.
The Indian Patent application numbered 494/MAS/2001 discloses a composite fiber reinforced wood substitute and a method of making the same wherein the natural fibres are impregnated with an adhesive blend from phosphate polyols and bonded with an adhesive blend of polyurethane resins and further compressed under a suitable pressure and temperature. However, in the said composite polyurethane is used as binder which is an expensive material, making the method and the product expensive. Further, the product of the said method does not improve its fatigue life.
The Indian Patent application numbered 730/MUM/2003 discloses a method of manufacturing natural fiber based thermoset composite sheet by impregnating the jute fibers in a slurry made by admixing filler and additives with a resin of phenolic substances viz. phenol, monochloro phenol and formaldehyde. However, aforementioned

processes use resins which do not impart stretch induced crystallinity to the product and neither do they sustain their original property on repeated cyclic use.
US Patent US7232605 discloses composite structural members comprising polymers, natural and synthetic fibers (preferably nano-scale platelets) arranged in two- or three-dimensional cellular skeletal structure with material hybridization which are lower in cost and can be used as efficient structural beam. The composites of the said invention do not possess improved fatigue property as the reinforcing fillers are not treated with any coupling/surface treating agents and elastomers.
WO/03035573 discloses treatment of natural organic fibers by mass mixing them in a polymer organic self-curing precursor and/ sodium silicate solution, followed by treatment with mineral acid or salt solution and then contacted with an aluminum containing solution or paste. The precursor composites of the said patent are coated with mineral salts/aluminum which are inorganic in nature. Further, though inorganic treated fibers exhibit enhanced fire property, they would fail in cyclic use owing to their inferior fatigue property.
European Patent EP1958762 discloses a natural bonded fiber material consisting of a natural fiber textile of straw fiber, a natural fiber such as flat fiber and a matrix of biodegradable substance such a polyactide. The resin binders used in the aforesaid patent are thermoplastic materials like thermoplastic polyester and the reinforcing fibers used are straw, polylactide. flax etc. But as matter of fact any thermoplastic bound composite material is inferior in terms of ultra violet and environmental stress resistance. Further, thermoplastic based composites have low dimensional stability compared to cross-linked composites.
The primary problem with the existing processes for manufacturing bio-based hybrid advanced composites known in the art are a) low water absorption (b) they fail to impart higher fatigue endurance c) aforesaid process imparts substantial tensile and bending strength to the resulting composites and (d) are complicated and costly processes. Further, resins used in the aforementioned processes do not impart stretch induced

crystallinity to the product and neither do they sustain their original property on repeated cyclic use.
Accordingly, there is a long felt need to develop a simple yet technically improved and economically significant process of manufacturing bio-based hybrid advanced composites, which is simple and yields improved products having low glass transition and high tensile & bending strength and consequentially high durability when subjected to repeated use in both dynamic as well as static state.
OBJECT OF THE INVENTION:
Accordingly, the main object of the present invention is to provide a process for manufacturing improved bio-based hybrid advanced composites which is simple, elegant and cost effective.
Yet another object of the present invention to provide a process for manufacturing improved bio-based hybrid advanced composites, which have more fatigue life and/or impact/tensile/bending strength than the conventional natural fiber composites.
Another object of the present invention to provide a process for manufacturing improved bio-based hybrid advanced composites of equal bidirectional property.
SUMMARY OF THE INVENTION:
The present invention relates to a process of manufacturing bio-based hybrid advanced composites comprising: (a) treating fibers with coupling agent; (b) dehumidifying the aforesaid fibers; (c) grafting the fibers obtained in step (b) with an elastomer or a monomer; (d) dehumidifying the aforesaid grafted fibers; (e) dispersing the grafted fibers in resins dissolved in solvents, followed by devolatilizing the solvents; (f) stretching and compressing the fibers obtained from step (e). The present invention relates to bio-based hybrid advanced composites obtained from the process thereof.

The present invention has provided a novel, technically and / or economically significant process of manufacturing bio-based hybrid advanced composites from natural fibers such that hybrid advanced composites produced therein have higher tensile and binding strength. As per the present invention the fibers used for the process of manufacturing bio-based hybrid advanced composites are natural fibers and preferably jute and jute derivatives.
The present invention has provided a simple and economically viable process to produce bio-based hybrid advanced composites from natural fibers which have high tensile and binding strength.
DETAILED DESCRIPTION OF THE INVENTION:
The term 'bio-based hybrid advanced composite' refers to a composite which is composed to two or more different materials wherein the rubber latex grafted natural fiber used as reinforcing material to make thermoset composite material. Due to thin layer rubber coating onto fibers, enhanced mechanical as well as fatigue endurance life are achieved.
The present invention may be more readily understood by reference to the following detailed description as more readily brought out step wise in Flow Chart (Figure 1), which is only illustrative and in no way limits the scope of the invention.
Figure 1 is a flow chart of the process for manufacturing bio-based hybrid advanced composites.
The present invention provides a process of manufacturing bio-based hybrid advanced composites comprising:
(a) treating reinforcement fiber material with coupling agents;
(b) dehumidifying the treated fiber material at a temperature ranging from 50°C to
80°C to obtain dried and chemically treated reinforcement fibers;

(c) grafting the dried and chemically treated reinforcement fibers by mixing them with grafting agents such as elastomers or monomers;
(d) dehumidifying and subsequent curing of the grafted fibers at a temperature ranging from 90°C to 150°C;
(e) dispersing the grafted fibers in binder resins dissolved in solvents followed by devolatilizing the solvents at a temperature of 30°C to 45°C;
(f) stretching and compressing the devolatilized fibers at a temperature ranging from 100°C to 160°C and a pressure of 0-150 kg/cm2.
As per the present invention, the bio-based hybrid advanced composites comprises of (i) natural fiber or modified form, (ii) rubber latex and (iii) phenolic or epoxy resin material including epoxy modified phenolic resin or modified forms thereof; wherein the natural fiber is rubberized with rubber iatex and dispersed in the phenol resin material or modified form thereof.
In one of the preferred embodiment of the present invention, the bio-based hybrid advanced composites comprises of (i) natural fiber or modified form thereof of about 50 % to 75 % w/w of total composition, (ii) dry rubber of about 0.5% to 3 % w/w of total composition and (iii) phenolic or epoxy resin material including epoxy modified phenolic resin or modified forms thereof of about 20 % to 40 % w/w of total composition.
Useful thermosetting resins include phenolic resins, phenol-aldehyde resins, furan resins, amino-plast resins, alkyd resins, allyl resins, epoxy resins, epoxy prepregs, polyurethane resins, thermosetting polyester resins, polyamide bis-maleimide resin, polymaleimide-epoxy resin, polymaleimide-isocyanate resin, silicone resins, cyanate resins, a cyanate-epoxy resins, a cyanate-polymaleimide resins, and a cyanate-epoxy-polymaleimide resin; thermosetting so-called "IPN" as obtained by compounding the above thermosetting resins and engineering plastics such as polyamide (Nylon), aromatic polyester, polyetherimide, polyetherether ketone, polysulfone, and polyphenyleneether, and further

adding a catalyst; crosslinkable resins obtained by compounding an organic peroxide as a crosslinking agent and a radical polymerizable polyfunctional compound, a thermosetting resin and the like to resins. Because of the nature of thermosetting resins, they cannot be further heat processed without severe distortion or destruction.
Now referring particularly to the flowchart shown in Figure - 1 of the drawing, the process is explained as follows:
1. Natural fibers felt and natural fibers are treated with surface treating chemicals such as coupling agents. The surface treating chemicals are selected from (i) organic anhydride like Maleic and pthalic Anhydrides or (ii) silane coupling agents like amino isoprolyle ethoxy silane, isopropyl triisostearoyl titanate (abbreviated as titanate), g-aminopropyl trimethoxy silane (abbreviated as silane) or (iii) sebacoyl chloride (SC) or toluene diisocynate (TDI).
2. The treated jute fibers are then dehumidified and dried at a temperature ranging between 50°C - 80CC.
3. The dehumidified and chemically treated jute fibers are then grafted with 5-20% by weight of rubber latex. The rubber latex which is used may be selected from SBR latex (Styren Butadine Rubber) latex; NBR (Nytrle Butadine Rubber); NR (natural rubber), Polybutadine latex. Alternatively, the chemically treated jute fibers may be grafted with solvent based polyvinyl acetate, or monomers such as methyl methacrylate, ethyl acrylate, styrene, vinyl acetate, acrylonitrile and acrylamide in the presence of different redox initiator systems such as vanadium -cyclohexanol and vanadium - cyclohexanone. As per one of the preferred embodiment, SBR latex having 5-20% by weight of solid content is used as the rubber latex for grafting the treated jute fibers. The rubber is pre-mixed with rubber chemicals/ curatives. Typically, the rubber chemicals are selected from sulphur, zinc dibutyle dithacarbamate, Mercapto benzo thizole (MBT), zinc diethyl dithacarbamate (2DEC) and TDQ Quinon type.

4. The rubber grafted fibers obtained above are then dehumidified at a temperature ranging from 90°C -150°C. The deposited rubber gets cross-linked with the treated jute fibers at higher temperature.
5. The rubberized jute fibers/fabrics are then passed through binding resins such as phenol formaldehyde, polyester, epoxy and/or their blend in presence of solvents, followed by devolatilization of the solvent used for binding.
6. The rubberized jute fibers/fabrics are then stretched in either uni-axial or bi-axial direction. Therefore, as per one of the preferred embodiment of the present invention, the stretching is done in bi-axial direction. The property of the product is enhanced bi-directionally when the stretching is carried out in a biaxial direction.
7. The stretched fibers/fabrics are then sandwiched between other natural felts or synthetic waste fibers. The jute fibers/fabrics are alternately stacked or layered with other natural fibers or synthetic waste fibers. This is an optional step.
8. The stretched jute fibers/fabrics are subsequently pressed by compression molding. It is due to this pre-stretching before molding and subsequent stretching of during molding that the rubberized jute fibers/fabrics experience necking. This results in increased crystallinity thereby imparting high tensile and bending strength to the final product.
As per the present invention, the starting materials used for reinforcement are natural fibers and / or any modified form thereof. All natural fibers in whatever forms, per se or in combination with one another, may be used as the reinforcement material for the purpose of the obtaining bio-based hybrid advanced composites of the present invention.

In one of the embodiment of the present invention, the natural fiber used for reinforcement may be selected from a group comprising of rice straw, wheat straw, rice husk, coconut husk, coconut straws, cotton stalks, all forms and range of bagasse, pine needles, non-edible grasses, jute, jute fibers, jute felt, polyesters, and cotton fabrics. In another embodiment, multiple symmetrical layers of cotton fabric, polyester, jute felt, jute fabric and bagasse may be used, in a preferred embodiment, jute and jute fibers may be used.
As per the present invention, the rubberized fibers/fabrics are dispersed in binding resins which may be selected from a group comprising of phenol formaldehyde, modified Phenol Formaldehyde (PF) resin, polyester, modified polyester resin, epoxy and/or modified epoxy resin based binder.
Each of the components are pretreated according to steps 1 to 8 above and are subject to the following procedure:-
Procedure:
Surface treating chemicals or coupling agents selected from organic anhydrides like Maleic and pthaleic anhydrides; sylane coupling agents like amino isoprolyle ethoxy silane, isopropyl triisostearoyl titanate (abbreviated as titanate), g - aminopropyl trimethoxy silane (abbreviated as silane), sebacoyl chloride (SC), and toluene diisocynate (TDI) are taken in the Doctor Box attached in the SMC machine.
Dried natural fibers are passed through the Doctor Box at 50°C - 80°C and treated with the coupling agents to enhance organophilic character of the natural fibers. The fibers are drawn out of the doctor box at a speed of 0.2 to 0.5 meters per minute.
The dried and chemically treated natural fibers are then passed through another doctor box containing rubber latex having 5-20% solid content or monomers for polymerization in the presence of redox initiator systems. In a preferred embodiment, the styrene butadiene rubber latex is used for rubberization of the natural fibers.

The redox initiator systems are used when the jute fibers/fabrics are grafted with monomers. Redox initiator systems such as vanadium - cyclohexanol or vanadium -cyclohexanon or any other conventional redox initiator known in the art may also be used. Whereas grafting chemicals i.e. elastomers/monomers are premixed with rubber chemicals such sulphur, zinc dibutyl dithaearbamate, marcapto benzothizole (MBT), zinc diethyl dithaearbamate (ZDEC) and/or TDQ Quinon.
The rubber grafted fibers obtained are then dehumidified at a temperature of 90 - 150°C. The deposited rubber gets cross-linked to the treated natural fibers at this temperature.
The rubberized fiber/fabric is then passed through binder resins. As per the present invention the binding resins are phenolic or epoxy material resins and include epoxy modified phenolic resin or modified forms thereof. Other polyester or polyester modified polyester resins are also used as binding resins. Typically, the binding resins are selected from a group comprising phenol formaldehyde, modified phenol formaldehyde resins, polyster and modified polyester resin, epoxy and modified epoxy resin. After the fibers are dispersed and passed through the binder resins, the solvents used with binder resins are removed by devolatilization.
The fibers/fabrics may then optionally, be sandwiched with other natural felts or waste synthetic fibers to further increase the tensile strength of the final product. The fibers are wound in a roll form. These rolls form the raw material for the final advanced composite which may be either in the form of fibers or in the form of sheets of fabrics. The desired length or material is cut in desired shape from the roll stock which is sequentially stacked layer after layer and then wound with jute roving. In a preferred embodiment the aforesaid fibers/raw materials are compressed by pressing in a compression molding machine by keeping the pressure at 0-150 kg/cm2 at a temperature ranging between 100°C - 160 °C. The stretching and/or compression of the fibers is carried out at an elevated temperature.

It has been found that the bio-based hybrid advanced composites obtained by the above described process of the present invention, yields products with substantial technical advancements. In particular, the bio-based hybrid advanced composites of the present invention have the following advantages:
1. Low cost.
2. Easy Processing.
3. High toughening (High Impact strength).
5. More Isotropic strength than conventional Natural fiber composites.
4. More flexibility.
5. Less fatigue (More durable).
6. Generally toughening compromise on tensile strength.
7. Natural product with comparable strength as like glass fiber composites.
8. Composition based on 80% waste materials.
The following Examples would explain/describe the present invention and suitable composition having different tensile strength, sheer strength, flexural strength are stated in tabular format shown below the examples. It also compares the ultimate tensile strength and other qualities with those of wood.
Example 1
Jute felt and jute fibers were passed through doctor box containing 0.5% maleic anhydride. Jute felt and jute fibers were subjected to surface treatment of maleic anhydride at 80 °C and this temperature was maintained till the felt entered another doctor box. This treated jute was then passed through another doctor box containing SBR latex having 5% solid content. SBR latex was grafted to the treated jute fibers at 150 °C and this temperature was maintained till the jute felt was dehumidified. The rubberized jute fabric was then passed through phenol formaldehyde in another doctor box The treated Jute was drawn at a speed of 0.5 meter per minute and the fibers were wound in roll form.

The rectangular shape raw materials (phenol formaldehyde impregnated Jute) were kept layer by layer with proper sequence. The sequentially arranged pre-preg were placed in a compression molding machine. Desired cross linking and shape was obtained at a pressure of 150kg/cm2 and at a temperature of 160 °C. The said temperature and pressure conditions were maintained for 15 minutes.
Example 2
Jute felt and jute fibers were passed through doctor box containing 0.5% maleic anhydride. Jute felt and jute fibers were subjected to surface treatment of maleic anhydride at 50 °C and this temperature was maintained till the felt entered another doctor box. This treated jute was then passed through another doctor box containing SBR latex having 5% solid content. SBR latex was grafted to the treated jute fibers at 90 °C and this temperature was maintained till the jute felt was dehumidified. The rubberized jute fabric was then passed through phenol formaldehyde. The treated jute was drawn at a speed of 0.2 meter per min. Fibers were the wound in roll form.
The component was moulded while under stretching using a specially designed mould. The fabrics were stretched in wake of winding of roving and sandwiched with other natural felts under a designed frame, attached to the compression molding mould. The rectangular shape raw materials were kept layered by layer structure with proper sequence. Desired raw material (pre-preg) was wound with jute roving in a rectangular frame. The sequentially arranged pre-preg was placed in compression molding machine. Desired cross linking and shape was obtained at a pressure of 2 kg/cm and at a temperature of 100 °C. The above mentioned temperature and pressure were maintained for 15 mins.
Example 3
Jute felt and jute fibers v/ere passed through doctor box containing 1.0% maleic anhydride. Jute felt and jute fibers were subjected to surface treatment of maleic anhydride at 80 °C and this temperature was maintained till the felt entered another doctor box. This treated jute was then passed through another doctor box containing SBR latex having 20% solid content. SBR latex was grafted to the treated jute fibers at 150 °C

and this temperature was maintained till the jute feit was dehumidified. The rubberized jute fabric was then passed through phenol formaldehyde. The treated Jute was drawn at a speed of 0.5 meter per minute and the fibers were wound in roil form.
Remaining steps are repeated as per the procedure explained in Example 1.
Example 4
Jute felt and jute fibers were passed through doctor box containing 1.0% maleic anhydride. Jute felt and jute fibers were subjected to surface treatment of maleic anhydride at 50 °C and this temperature was maintained till the felt entered another doctor box. This treated jute was then passed through another doctor box containing SBR latex having 20% solid content. SBR latex was grafted to the treated jute fibers at 90°C and this temperature was maintained till the jute felt was dehumidified. The rubberized jute fabric was then passed through phenol formaldehyde. The treated Jute was drawn at a speed of 0.2 meter per minute and the fibers were wound in roll form.
The component was molded while under stretching using specially designed mould. Remaining steps are repeated as per the procedure explained in Example 1.
Example 5
Jute felt and jute fibers were passed through doctor box containing 2.5% maleic anhydride. Jute felt and jute fibers were subjected to surface treatment of maleic anhydride at 80 °C and this temperature was maintained till the felt entered another doctor box. This treated jute was then passed through another doctor box containing SBR latex having 10% solid content. SBR latex was grafted to the treated jute fibers at 150 °C and this temperature was maintained till the jute felt was dehumidified. The rubberized jute fabric was then passed through phenol formaldehyde. The treated Jute was drawn at a speed of 0.5 meter per minute and the fibers were wound in roll form.
Remaining steps are repeated as per the procedure explained in Example 1.

Example 6
Jute felt and jute fibers were passed through doctor box containing 2.5% maleic anhydride. Jute felt and jute fibers were subjected to surface treatment of maleic anhydride at 50 °C and this temperature was maintained till the felt entered another doctor box. This treated jute was then passed through another doctor box containing SBR latex having 10% solid content. SBR latex was grafted to the treated jute fibers at 90 °C and this temperature was maintained till the jute felt was dehumidified. The rubberized jute fabric was then passed through phenol formaldehyde. The treated Jute was drawn at a speed of 0.2 meter per minute and the fibers were wound in roll form.
The component was molded while under stretching using specially designed mould. Remaining steps are repeated as per the procedure explained in Example 1.
The following table compares the properties of the resulting bio-based hybrid advanced composites of the present invention with the conventional composites. The table shows comparison of properties between composite fiber samples A, B, C, D, E and F as compared to conventional fibers.

Sr
N
0. Conventi

Descripti Unit A B C D E F Wood formw Conventi onal onal jute fiber

on ork Bamboo composite
s
1. Tensile Strength MPa 60 65 63 75 75 82 30 35 58
2. Flexural MPa 10 11 12 13 15 19 20 50 120
strength 9 4 5 2 0 4
3. Drop
resistanc e Times >50 <10 <10 >30
4. Thermal
degradati
on 0C >370 300 300 >300
5. Low
temperat
ure
performa
nee -20 oC, 0.5 kg drop from 1
m Not Broken Broken
6. Hardness R <85 - - >100
7. Impact strength KJ/m2 >90 >60 ,>60 >60
8. UV
resistanc e performa % change >2 >1


nee
9. Water absorptio
n % 72 hrs at 70 °C<0.2 24hrs < 0.2
10 Water Visual delaminating and no - -
resistanc observat blister observed
e ion

11 Dimensio
na]
change
after
heating % ±1.25 ±2.5 ±3.5 ±0.5
12 No of
cyclic
use Time >70 >10 >10 >50
13 Density g/cm3 1.15 to 1.20 0.96 0.98 1.20
Table-I
The results in Table-I unequivocally establish the superior traits of composite fibers prepared in accordance with the present invention as compared to conventional composite fiber.
The present invention has been described with reference to preferred embodiments, purely for the sake of understanding and not by way of any limitation and the present invention includes all legitimate developments within the scope of what has been described hereinbefore and claimed in the appended claims.

We Claim;
1. A process of manufacturing bio-based hybrid advanced composites comprising :
(a) treating fibers with coupling agent;
(b) dehumidifying the aforesaid fibers;
(c) grafting the fibers obtained in step (b) with an elastomer or a monomer;
(d) dehumidifying the aforesaid grafted fibers;
(e) dispersing the grafted fibers in resins dissolved in solvents, followed by devolatilizing the solvents;
(f) stretching and compressing the fibers obtained from step (e).

2. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the fibers are selected from rice straw, wheat straw, rice husk, coconut husk, coconut straw, cotton stalk, bagasse, pine needle, non-edible grasses, jute, jute fibers, jute felt, polyester, cotton fabric or combinations thereof
3. A process of manufacturing bio-based hybrid advanced composites as claimed in claims 1 and 2, wherein the fibers consist of multiple layers of cotton fabric, polyester, jute felt, jute fabric and bagasse.
4. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the coupling agent is selected from maleic anhydride, pthalic anhydrides, silane coupling agents like 1) amino isoprolyle ethoxy silane, 2) isopropyl triisostearoyl titanate, 3) g-aminopropyl trimethoxy silane, sebacoyl chloride (SC) and 4) toluene diisocynate (TDI) or mixtures thereof.

5. A process of manufacturing bio-based hybrid advanced composites as claimed in claims 1 and 4, wherein the coupling agent in step (a) is 1-25% by weight of total solution.
6. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the dehumidification in step (b) is carried out at temperature between 50oC to 80°C, preferably between 30 °C to 60°C , more preferably between 35°C to 45°C.
7. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the elastomer used in step (c) is selected from styrene butadiene rubber (SBR latex), nitrile butadiene rubber (NBR), Natural rubber (NR), polybutadiene, solvent based polyvinyl acetate or combinations thereof and the monomer used in step (c) is selected from methyl methacrylate, ethyl acrylate, styrene, vinyl acetate, acrylonitrile and acrylamide or combinations thereof.
8. A process of manufacturing bio-based hybrid advanced composites as claimed in claims 1 and 6, wherein the elastomer in step (c) is used in the range of 5% to 20% w/w of solid content.
9. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the elastomer is premixed with sulphur, zinc dibutyl dithacarbamate, marcapto benzothizole (MBT), zinc diethyl dithacarbamate (ZDEC) and/or TDQ Quinon.
10. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the process step (d) is carried out at temperature between 90°C and 150 °C , preferably between 90°C and 100°C.

11. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the resins used in process step (e) are selected from phenol formaldehyde resins, modified phenol formaldehyde resins, polyester resins, modified polyester resins, epoxy resins, modified epoxy resins or mixtures thereof.
12. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the solvents used in process step (e) are selected from aliphatic alcohols such as ethyl alcohol or methyl alcohol, or acetone or a mixture thereof and/or distilled water.
13. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the grafted fibers are roved and/or sandwiched by alternatively layering them with other natural fibers and/or synthetic waste fibers.
14. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the stretching and compressing in step (f) is carried out at a temperature between 100°C to 160°C and under pressure of 0-150 kg/cm.
15. A process of manufacturing bio-based hybrid advanced composites as claimed in claim 1, wherein the stretching and compressing in step (f) is in uni-axial or biaxial direction, preferably in a biaxial direction.
16. A process of manufacturing bio-based hybrid advanced composites as claimed in claims 1 and 16, wherein the stretching and compressing in step (f) is carried under pressure ranging between 0-150 kg/cm2.

17. Bio-based hybrid advanced composite obtained from the process claimed in claims 1 to 16.