# US 4,395,525 A · Hot melt adhesives

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- Number: US 4,395,525 A
- Document ID: US4395525A
- Status: Granted
- Kind: A
- Application number: 06/194,013
- Filed: 1980-10-06
- Granted: 1983-07-26
- Earliest claimed: 1979-10-06
- Assignees: Hoechst Aktiengesellschaft
- Inventors: Hannes Fischer; Rolf Zimmermann
- Web page: https://patentgrep.com/patent/US4395525A

## CPC

- C09J 133/064: {containing anhydride, COOH or COOM groups, with M being metal or onium-cation}
- C08F 220/12: of monohydric alcohols or phenols
- C09J 2301/304: the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
- Y10T 428/2826: Synthetic resin or polymer
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A hot melt adhesive having a good thermal stability under load, based on a copolymer of a predominant proportion of acrylates or methacrylates, a minor proportion of acrylic or methacrylic acid amides and further based on acrylic or methacrylic acid compounds, characterized in that the copolymer comprises (a) 85 to 95% by weight of alkyl acrylates and/or methacrylates with 1 to 12 carbon atoms in the alkyl radical, (b) 3 to 10% by weight of acrylamide and/or methacrylamide, (c) 0.2 to 5% by weight of one or more olefinically unsaturated mono- or dicarboxylic acids with up to 5 carbon atoms, the sum of components (a) to (c) amounting to 100%, at a and a process for preparing a multi-layer article, containing said adhesives.

## Claims

### Claim 1

A hot melt adhesive having a good heat stability comprising a copolymer of
(a) from 85 to 95% by weight of an alkylester of at least one carboxylic acid selected from the group consisting of acrylic and methacrylic acid each having 1 to 12 carbon atoms in the alkyl radical,
(b) from 3 to 10% by weight of at least one acrylic or methacrylic amide or mixture thereof,
(c) from 0.2 to 3% by weight of at least one olefinically unsaturated carboxylic acid having at most 2 carboxylic groups and having up to 5 carbon atoms wherein the total of the percentages is always 100 and wherein the copolymer has a melt viscosity of 20 to 80 Pa.s/180.degree. C.

### Claim 2 (depends on 1)

An adhesive as claimed in claim 1 in which component (a) consists of (a1) at least one butylacrylate, (a2) at least one alkylacrylate having from 6 to 12 carbon atoms in the alkyl radical and (a3) methylmethacrylate.

### Claim 3 (depends on 2)

An adhesive as claimed in claim 2, wherein the weight ratio of component (a1):(a2):(a3) is in the range from (15 to 35):(55 to 85):(5 to 15), wherein the total is always 100.

### Claim 4 (depends on 3)

An adhesive as claimed in claim 3, wherein the weight ratio of component (a1):(a2):(a3) is in the range from (20 to 30):(60 to 75):(7 to 12).

### Claim 5 (depends on 1)

An adhesive as claimed in claim 1, wherein the copolymer has a melt viscosity of at most 55 Pa.s/180.degree. C.

### Claim 6 (depends on 1)

An adhesive as claimed in claim 1 in the form of an adhering hot melt adhesive.

### Claim 7 (depends on 1)

An adhesive of claim 1 wherein the olefinically unsaturated carboxylic acid component (c) of the copolymer is a member selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof.