# US 5,348,772 A · Use of amino groups, obtained on a polymer material by an electric treatment under nitrogen atmosphere, for accelerating a grafting reaction

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- Number: US 5,348,772 A
- Document ID: US5348772A
- Status: Granted
- Kind: A
- Application number: 07/892,185
- Filed: 1992-06-02
- Granted: 1994-09-20
- Earliest claimed: 1991-06-10
- Assignees: Institut Textile de France
- Inventors: Odile Demuth; Daniel Wattiez; Jacques Maguin; Jean C. Brosse; Fabienne Poncin-Epaillard; Bruno Chevet
- Web page: https://patentgrep.com/patent/US5348772A

## CPC

- C08J 7/123: {Treatment by wave energy or particle radiation (C08J7/18 takes precedence)}
- C08J 7/12: Chemical modification
- C08J 7/18: using wave energy or particle radiation
- D06M 10/08: Organic compounds
- D06M 14/28: of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M 14/32: Polyesters
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS

## Abstract

The invention relates to the use of the amino groups created on the surface of a polymer material, such as a polypropylene film, by an electric treatment, notably a cold plasma, under nitrogen atmosphere, for accelerating the grafting of the polymer material by impregnating the latter with a bath containing a vinyl type unsaturated monomer comprising a carbonyl group in .alpha. of the double vinyl bond, such as an acrylic monomer.

## Claims

### Claim 1

A process for accelerating grafting of a polymeric material by impregnating said polymeric material in a bath containing an unsaturated monomer, said unsaturated monomer containing a vinyl functionality and comprising a carbonyl group in a position .alpha. to the double bond of said vinyl functionality, wherein said polymeric material is electrically treated in a nitrogen atmosphere at a frequency of 433 MHz in order to create amino groups on the surface of said polymeric material.

### Claim 2 (depends on 1)

The process of claim 1, wherein the polymeric material is polypropylene.

### Claim 3 (depends on 1)

The process of claim 1, wherein the electric treatment is cold plasma under nitrogen atmosphere.

### Claim 4 (depends on 1)

The process of claim 1, wherein the electric treatment is carried out in the following conditions: discharge power between 30 and 100 W, time of exposure of the polymeric material placed in the visible part of the plasma between 1.5 and 3 minutes.

### Claim 5 (depends on 1)

The process of claim 1, wherein the unsaturated monomer is an acrylic monomer.

### Claim 6 (depends on 5)

The process of claim 5, wherein the grafting occurs at a temperature between 70.degree. and 95.degree. C. for time periods varying between 24 and 48 hours.