# US 5,350,803 A · Moisture-curable melt-processible ethylene copolymer adhesives

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- Number: US 5,350,803 A
- Document ID: US5350803A
- Status: Granted
- Kind: A
- Application number: 08/040,811
- Filed: 1993-03-31
- Granted: 1994-09-27
- Earliest claimed: 1991-11-22
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: George W. Prejean
- Web page: https://patentgrep.com/patent/US5350803A

## CPC

- C09J 143/04: Homopolymers or copolymers of monomers containing silicon
- C08F 8/42: Introducing metal atoms or metal-containing groups
- C09J 123/26: modified by chemical after-treatment
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Moisture-curable melt-processible adhesives are obtained by reacting certain ethylene copolymers containing an alkyl acrylate and a carefully limited amount of a carboxylic acid with a stoichiometric amount of an epoxy-silane. A process of preparing the moisture-curable melt-processible adhesives in the absence of solvent is also available.

## Claims

### Claim 1

A melt-processible moisture-curable copolymer comprising the reaction product of
(A) a direct copolymer from monomers comprising
(i) ethylene,
(ii) 1-5 wt. % of the direct copolymer of an alpha,beta-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, half esters of maleic acid and itaconic acid, and
(iii) 15-40 wt. % of the direct copolymer of an alkyl acrylate or methacrylate selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate and iso-butyl acrylate, and
(B) a substantially stoichiometric amount with respect to the amount of carboxylic acid, of an epoxy-silane, wherein the melt index of the melt-processible, moisture-curable copolymer is from 30 to 1500.

### Claim 2 (depends on 1)

The moisture-curable melt-processible copolymer of claim 1 wherein the unsaturated carboxylic acid in the direct copolymer is methacrylic acid or acrylic acid and is present in an amount of from 2-4 wt. % in the direct copolymer.

### Claim 3 (depends on 2)

The moisture-curable melt-processible copolymer of claim 2 wherein the epoxy-silane (B) is glycidoxypropyl trimethoxysilane or beta-(3,4-epoxycyclohexyl)-ethyl trimethoxysilane.

### Claim 4 (depends on 1, 2)

A moisture-curable melt-processible adhesive comprising the copolymer of claim 1, 2, or 3.

### Claim 5 (depends on 4)

The moisture-curable melt-processible adhesive of claim 4 further comprising a plasticizer.

### Claim 6 (depends on 4)

The moisture-curable melt-processible adhesive of claim 4, further comprising a tackifier.

### Claim 7 (depends on 5)

The moisture-curable melt-processible adhesive of claim 5 further comprising a tackifier.

### Claim 8 (depends on 4)

The moisture cured adhesive resulting from the moisture cure of the moisture-curable adhesive of claims 4.

### Claim 9

The process of preparing a moisture-curable melt-processible copolymer comprising mixing in melt mixing equipment, in the absence of solvent, at a temperature of from 140.degree. to 200.degree. C.,
(A) a direct copolymer from monomers comprising
(i) ethylene,
(ii) 1-5 wt. % of the direct copolymer of an alpha,beta-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, half esters of maleic acid and itaconic acid, and
(iii) 15-40 wt. % of the direct copolymer of an alkyl acrylateor methacrylate selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate and iso-butyl acrylate, and
(B) a substantially stoichiometric amount with respect to the amount of carboxylic acid, of an epoxy-silane, wherein the melt index of the resultant melt-processible, moisture-curable copolymer is from 30 to 1500.