# US 6,296,908 B1 · Stable adhesive composite material made of polyurethane and of another thermoplastic material, a process for its production and a method for its use in motor vehicles

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 6,296,908 B1
- Document ID: US6296908B1
- Status: Granted
- Kind: B1
- Application number: 09/571,226
- Filed: 2000-05-16
- Granted: 2001-10-02
- Earliest claimed: 1999-05-26
- Assignees: Bayer Aktiengesellschaft
- Inventors: Karsten Reihs; Werner Rasshofer; Holger Warth; Dirk Wegener; Manfred Schmidt; Peter Heitkämper
- Web page: https://patentgrep.com/patent/US6296908B1

## CPC

- B32B 27/40: comprising polyurethanes
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/365: {comprising polycarbonates}
- C08J 5/12: Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
- C09J 175/08: from polyethers
- B32B 2266/0278: Polyurethane
- B32B 2323/04: Polyethylene
- B32B 2323/10: Polypropylene
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- B32B 2369/00: Polycarbonates
- B32B 2375/00: Polyureas; Polyurethanes
- C08J 2375/04: Polyurethanes
- Y10T 428/31507: Of polycarbonate
- Y10T 428/31551: Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T 428/31562: Next to polyamide [nylon, etc.]
- Y10T 428/31565: Next to polyester [polyethylene terephthalate, etc.]
- Y10T 428/31587: Hydrocarbon polymer [polyethylene, polybutadiene, etc.]
- Y10T 428/31598: Next to silicon-containing [silicone, cement, etc.] layer
- Y10T 428/31739: Nylon type
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to composite materials made of at least one composite layer of a polyurethane and of a second composite layer which is directly bonded to the first layer and which consists of a thermoplastic material that is different from the polyurethane of layer A). The polyurethane material of layer A) is characterized by a residual content of free reaction components containing ether groups of no more than 400 ppm, and preferably of no more than 100 ppm. The invention also relates to a process for the production of these composite materials and to a method of their use as materials in motor vehicles.

## Claims

### Claim 1

A process for the production of a composite material comprising at least two layers of different plastics materials which are directly bonded to one another, comprising:
(1) applying (A) a polyurethane-forming reaction system comprising (a) an organic polyisocyanate and (b) an isocyanate-reactive component, onto (B) a prefabricated thermoplastic polymer, and
(2) allowing the polyurethane-forming reaction system to fully react, thereby forming a composite material comprising at least two different plastics layers, wherein the polyurethane-forming reaction system has a residual content of reaction components containing ether groups of at most 400 ppm.

### Claim 2 (depends on 1)

The process of claim 1, wherein the polyurethane-forming reaction system has a residual content of reaction components containing ether groups of no more than 100 ppm.