Title of Invention	"A PROCESS FOR THE PREPARATION OF A POLYMERIC COMPOSITE MATERIAL"
Abstract	The present invention relates to a process for the preparation of a polymeric composite material which comprises the step of heat sealing at least one polymer members in form of fibre, film, flat tap or fabric with at least one another member of identical polymer in the same or different form but having different melting point. The invention also relates to a polymer composite material produced by such process.

Title of Invention

"A PROCESS FOR THE PREPARATION OF A POLYMERIC COMPOSITE MATERIAL"

Abstract

The present invention relates to a process for the preparation of a polymeric composite material which comprises the step of heat sealing at least one polymer members in form of fibre, film, flat tap or fabric with at least one another member of identical polymer in the same or different form but having different melting point. The invention also relates to a polymer composite material produced by such process.

Full Text	FIELD OF INVENTION The present invention relates to fabric based polymeric materials, (hereafter referred as "material") made from a single polymer. Thus the materials of the present invention, which may he in the form of a composite, are made from different or same forms of a single polymer. The materials composites of the present invention are made from fibre and film of a single polymer, from fibre and fibre of single polymer, from film and flat tape of single polymer or still further from fibre and flat tape of single polymer. A single polymer, herein, is considered as one having at least 85% of the same repeat unit. BACKGROUND OF THE INVENTION Polymeric materials are known to be used in a variety of ways, such as plastics, fibres, rubbers etc. The combination of these various forms of polymers are known to be used with certain advantages, but limited to a possibility of combination of same or different forms of different polymers. A typical example of a material made from the same form but different, polymer known in the art i« that of fabric of high density polyethylene laminated with low density polyethylene film used in the making of woven tracks. Yet. another known material is chopped high performance polyethylene fibre or HPPE fibre, processed with low density polyethylene or LDPE chips. This known polymeric material is made from different polymers having different characteristics namely HPPE fibre and LDPE chips and is prepared by melt mixing of components and suitable moulding. A distinct disadvantage of such known materials is that such materials are prepared from expensive high performance polyethylene (HPPE) fibres. Vet another disadvantage of such known materials is that the method of preparation has significant limitations due to high melt viscosity during melt processing. A further disadvantage of such known materials is that of high melt, viscosity during melt processing which also results in insufficient mixing of the? two components. A still further disadvantage is of a possibility of significant changes in properties of HPPE fibres during melt processing. Finally, the known process is limited to preparation of a combination of HPPE fibres and LDPE chips. OBJECTS OF THE INVENTION A primary object of the present invention is to propose polymeric materials or composites made from different or same forms of a single polymer. Another object of the present invention is to propose low cost polymeric materials made from easily available polymeric raw materials. A further object of the present invention is to propose polymeric materials which can be recycled after the desired use. A still further object of the present invention is to propose polymeric materials which ran he of have a multi-layer construction to provide the desired dimensions. Yet another object of the present invention is to propose polymeric materials which are degradable under environmental conditions. DESCRIPTION OF THE INVENTION According to this invention there is provided a process for the preparation of a polymeric materials or composites comprising at least a first and second member, said members being of the same polymer but of different properties and sealed to each other at the melting temperature range of the polymer and at a pressure of • 1 to 4 kb. In accordance with this invention, the first and second members are of the same polymer and selected from fibre, film, flat tape or fabric. Thus, the members could be fibre and fibre, film and flat tape, fibre and flat tape, fabric and film or fabric and fabric, of the same polymer hut having different properties. By way of example, the single polymer is polypropylene, hereinafter referred to as PP, from its fibre and film form comprises of heat sealing or impregnation of PP film and PP fibre of desired shape and dimensions in temperature range of about 150 to 165 °C at a pressure of about 1 to 4 kg, which results in complete impregnation of film and fabric. In accordance with one embodiments of the present invention, the method of preparation of polymeric materials made from same form of the single or same polymer, for example made from fibre and fibre of a single polymer comprises of heat sealing of two sets of said same form of the single or same polymer, that is fibres of same polymer with different melting behavior and/or properties. Thus, a typical example, which is not intended to limit the scope of the present invention, is preparation of polymeric materials of polypropylene, from its fibre forms comprises of heat sealing of PP fibres of desired shape and dimensions but having different melt behaviour, which results in complete impregnation of fabrics. In accordance with an embodiment of the present invention, the textile structure and film or textile structure of two different types of fibres, is placed in a mould to any desired shape. The mould temperature on the two side of the mould is changed to impart a rough structure, if desired. Further, in the polymeric materials with porous structure the film in supplied in deficiency. Depending upon the thickness of the polymeric material, each of the members may consists of a single or a plurality of layers and of the same member. Further, the polymeric materials or composites can be prepared in woven form, non—woven form, knitted form, braided form or more complex three dimensional structures or a combination of these forms, say in the form of layers. The polymers that can be employed in the polymeric form are, for example, polypropylene, high density polyethylene, polyethylene tetephthalate, polybutyle terephthalate, polypropylene terephthalate, nylons liquid crystal polymeric systems etc. and other thermoplastics that can be converted to fibre, film or flat tape forms. The materials of the presently disclosed invention are very strong arid could be obtained in desired show and with desired characteristics, like porous or water scalable, rough or smooth, and are completely recyclable. The materials of the presently disclosed invention find their applications in wide range, such as geogrids, geotextiles, medical packaging and in general material substitute to whole range of other products. As described hereinabove, and in accordance with an embodiment of this invention, the polymeric material is formed by impregnation of the first member to the second member. The density of the polymeric material is dependent on the level of impregnation. I CLAIMS. 1. A process for the preparation of a polymeric materials or composites comprising at least a first and second member said members being of the same polymer but of different properties and sealed to each other at the melting temperature range of the polymer and at a pressure of 1 to 4 kb. 2. A process as claimed in claim 1 wherein each of said members are of the same polymer but of different properties and selected from fibre, film, flat tape or fabric. 3. A process as claimed in claims 1 and 2 wherein said polymeric material comprises a first member in the form of a fibre and a second member selected from fibre, film, flat or fabric. 4. A process as claimed in claims 1 and 2 wherein said polymeric material comprises a first member in the form of a fibre and second member selected from fibre, film, flat or fabric. 5. A process as claimed in claims 1 and 2 wherein said polymeric material comprises a first member in the form of a flat and a second member selected from fibre, film, flat or fabric. 6. A process as claimed in claims 1 and 2 wherein said polymeric: material comprises a first member in the form of a fabric and the second member selected from fibre, film, flat or fabric. 7. A process as claimed in claims 1 to 6 wherein said polymer is polypropylene and other polymer as herein described. 8. A process as claimed in claim 1 comprising a plurality of said first and/or second members. 9. A process as claimed in claim 1 wherein said step of sealing comprises in the step of impregnation. 10. A process as claimed in claim 9 wherein the density of the polymeric material is dependent on the level of impregnation. 11. A process for the preparation of a polymeric material or composite substantially as herein described. 12. A polymeric material or composite comprising at least a first member sealed to a second member at the melting temperature range of said polymers, said members being of the same polymer but of different properties and selected from fibre, film, flat tape or fabric, said members forming an inhomogeneous polymer material. 13. A process as claimed in claim 12 wherein maid polymeric material comprises a first member in the form of a Fibre and a second member selected from fibre, film, flat or fabric. 14. A process as claimed in claim 12 wherein said polymeric material comprises a first member in the form of a fibre and second member selected from fibre, film, flat or fabric. 15. A process as claimed in claim 12 wherein said polymeric material comprises a first member in the form of a flat and a second member selected from fibre, film, flat or fabric. 16. A process as claimed in claim 12 wherein said polymeric material comprises a first member in the form of a fabric and the second member selected from fibre, film, flat or fabric. 17. A process as claimed in claim 12 wherein said polymer is polypropylene and other polymers as herein described. 18. A polymeric material as claimed in claim 12 comprising a plurality of first and/or second members. 19. A polymeric material or composite substantially as herein described.

Full Text

FIELD OF INVENTION
The present invention relates to fabric based polymeric materials, (hereafter referred as "material") made from a single polymer. Thus the materials of the present invention, which may he in the form of a composite, are made from different or same forms of a single polymer. The materials composites of the present invention are made from fibre and film of a single polymer, from fibre and fibre of single polymer, from film and flat tape of single polymer or still further from fibre and flat tape of single polymer. A single polymer, herein, is considered as one having at least 85% of the same repeat unit.
BACKGROUND OF THE INVENTION
Polymeric materials are known to be used in a variety of ways, such as plastics, fibres, rubbers etc. The combination of these various forms of polymers are known to be used with certain advantages, but limited to a possibility of combination of same or different forms of different polymers.
A typical example of a material made from the same form but different, polymer known in the art i« that
of fabric of high density polyethylene laminated with low density polyethylene film used in the making of
woven tracks.
Yet. another known material is chopped high performance polyethylene fibre or HPPE fibre, processed with low density polyethylene or LDPE chips. This known polymeric material is made from different polymers having different characteristics namely HPPE fibre and LDPE chips and is prepared by melt mixing of components and suitable moulding.
A distinct disadvantage of such known materials is that such materials are prepared from expensive high performance polyethylene (HPPE) fibres. Vet another disadvantage of such known materials is that the method of preparation has significant limitations due to high melt viscosity during melt processing. A further disadvantage of such known materials is that of high melt, viscosity during melt processing which also results
in insufficient mixing of the? two components. A still further disadvantage is of a possibility of significant changes in properties of HPPE fibres during melt processing. Finally, the known process is limited to preparation of a combination of HPPE fibres and LDPE chips.
OBJECTS OF THE INVENTION
A primary object of the present invention is to propose polymeric materials or composites made from different or same forms of a single polymer.
Another object of the present invention is to propose low cost polymeric materials made from easily available polymeric raw materials.
A further object of the present invention is to propose polymeric materials which can be recycled after the desired use.
A still further object of the present invention is to propose polymeric materials which ran he of have a multi-layer construction to provide the desired dimensions.
Yet another object of the present invention is to propose polymeric materials which are degradable under environmental conditions.
DESCRIPTION OF THE INVENTION
According to this invention there is provided a process for the preparation of a polymeric materials or composites comprising at least a first and second member, said members being of the same polymer but of different properties and sealed to each other at the melting temperature range of the polymer and at a pressure of • 1 to 4 kb.
In accordance with this invention, the first and second members are of the same polymer and selected from fibre, film, flat tape or fabric. Thus, the members could be fibre and fibre, film and flat tape, fibre and flat tape, fabric and film or fabric and fabric, of the same polymer hut having different properties.
By way of example, the single polymer is polypropylene, hereinafter referred to as PP, from its fibre and film form comprises of heat sealing or impregnation of PP film and PP fibre of desired shape and dimensions in temperature range of about 150 to 165 °C at a pressure of about 1 to 4 kg, which results in complete impregnation of film and fabric.
In accordance with one embodiments of the present invention, the method of preparation of polymeric materials made from same form of the single or same polymer, for example made from fibre and fibre of a single polymer comprises of heat sealing of two sets of said same form of the single or same polymer, that is fibres of same polymer with different melting behavior and/or properties.
Thus, a typical example, which is not intended to limit the scope of the present invention, is preparation of polymeric materials of polypropylene, from its fibre forms comprises of heat sealing of PP fibres of desired shape and dimensions but having different melt behaviour, which results in complete impregnation of fabrics.
In accordance with an embodiment of the present invention, the textile structure and film or textile structure of two different types of fibres, is placed in a mould to any desired shape. The mould
temperature on the two side of the mould is changed to impart a rough structure, if desired. Further, in the polymeric materials with porous structure the film in supplied in deficiency.
Depending upon the thickness of the polymeric material, each of the members may consists of a single or a plurality of layers and of the same member. Further, the polymeric materials or composites can be prepared in woven form, non—woven form, knitted form, braided form or more complex three dimensional structures or a combination of these forms, say in the form of layers.
The polymers that can be employed in the polymeric form are, for example, polypropylene, high density polyethylene, polyethylene tetephthalate, polybutyle terephthalate, polypropylene terephthalate, nylons liquid crystal polymeric systems etc. and other thermoplastics that can be converted to fibre, film or flat tape forms.
The materials of the presently disclosed invention
are very strong arid could be obtained in desired show
and with desired characteristics, like porous or water
scalable, rough or smooth, and are completely
recyclable.
The materials of the presently disclosed invention find their applications in wide range, such as geogrids, geotextiles, medical packaging and in general material substitute to whole range of other products.
As described hereinabove, and in accordance with an embodiment of this invention, the polymeric material is formed by impregnation of the first member to the second member. The density of the polymeric material is dependent on the level of impregnation.

I CLAIMS.
1. A process for the preparation of a polymeric
materials or composites comprising at least a first and
second member said members being of the same polymer
but of different properties and sealed to each other at
the melting temperature range of the polymer and at a

pressure of 1 to 4 kb.
2. A process as claimed in claim 1 wherein each of
said members are of the same polymer but of different
properties and selected from fibre, film, flat tape or
fabric.
3. A process as claimed in claims 1 and 2 wherein
said polymeric material comprises a first member in the
form of a fibre and a second member selected from fibre,
film, flat or fabric.
4. A process as claimed in claims 1 and 2 wherein
said polymeric material comprises a first member in the
form of a fibre and second member selected from fibre,
film, flat or fabric.
5. A process as claimed in claims 1 and 2 wherein
said polymeric material comprises a first member in the
form of a flat and a second member selected from
fibre, film, flat or fabric.
6. A process as claimed in claims 1 and 2 wherein said polymeric: material comprises a first member in the form of a fabric and the second member selected from fibre, film, flat or fabric.
7. A process as claimed in claims 1 to 6 wherein said
polymer is polypropylene and other polymer as herein described.
8. A process as claimed in claim 1 comprising a
plurality of said first and/or second members.
9. A process as claimed in claim 1 wherein said step
of sealing comprises in the step of impregnation.
10. A process as claimed in claim 9 wherein the
density of the polymeric material is dependent on the
level of impregnation.
11. A process for the preparation of a polymeric
material or composite substantially as herein described.
12. A polymeric material or composite comprising at
least a first member sealed to a second member at the
melting temperature range of said polymers, said members being of the same polymer but of different properties
and selected from fibre, film, flat tape or fabric, said members forming an inhomogeneous polymer material.
13. A process as claimed in claim 12 wherein maid
polymeric material comprises a first member in the form
of a Fibre and a second member selected from fibre, film, flat or fabric.
14. A process as claimed in claim 12 wherein said
polymeric material comprises a first member in the form of a fibre and second member selected from fibre, film, flat or fabric.
15. A process as claimed in claim 12 wherein said
polymeric material comprises a first member in the form
of a flat and a second member selected from fibre, film,
flat or fabric.
16. A process as claimed in claim 12 wherein said
polymeric material comprises a first member in the form
of a fabric and the second member selected from fibre,
film, flat or fabric.
17. A process as claimed in claim 12 wherein said
polymer is polypropylene and other polymers as herein
described.
18. A polymeric material as claimed in claim 12
comprising a plurality of first and/or second members.
19. A polymeric material or composite substantially as
herein described.

Documents:

145-del-2000-abstract.pdf

145-del-2000-claims.pdf

145-del-2000-correspondence-others.pdf

145-del-2000-correspondence-po.pdf

145-del-2000-description (complete).pdf

145-del-2000-form-1.pdf

145-del-2000-form-13.pdf

145-del-2000-form-19.pdf

145-del-2000-form-2.pdf

145-del-2000-form-3.pdf

145-del-2000-form-5.pdf

145-del-2000-gpa.pdf

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Patent Number

226286

Indian Patent Application Number

145/DEL/2000

PG Journal Number

01/2009

Publication Date

02-Jan-2009

Grant Date

16-Dec-2008

Date of Filing

23-Feb-2000

Name of Patentee

Dr. Deopura, Basant Lal

Applicant Address

PROFESSOR, DEPARTMENT OF TEXTILE TECHNOLOGY, INDIAN INSTITUTE OF TECHNOLOGY DELHI (IITD), HAUZ KHAS, NEW DELHI-110016, INDIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	DR. DEOPURA, BASANTI LAL	PROFESSOR, DEPARTMENT OF TEXTILE TECHNOLOGY, INDIAN INSTITUTE OF TECHNOLOGY DELHI (IITD), HAUZ KHAS, NEW DELHI-110016, INDIA.

PCT International Classification Number

C08G 63/003

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA