# US 5,708,041 A · Foamable molding compositions

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- Number: US 5,708,041 A
- Document ID: US5708041A
- Status: Granted
- Kind: A
- Application number: 08/800,753
- Filed: 1997-02-14
- Granted: 1998-01-13
- Earliest claimed: 1996-02-14
- Assignees: Hoechst Aktiengesellschaft
- Inventors: Helmut Scheckenbach; Axel Schonfeld; Siegfried Weis
- Web page: https://patentgrep.com/patent/US5708041A

## CPC

- C08J 9/02: using blowing gases generated by the reacting monomers or modifying agents during the preparation or modification of macromolecules
- C08G 75/0295: Modification with inorganic compounds
- C08G 75/18: Polysulfoxides
- C08J 9/0061: {characterized by the use of several polymeric components}
- C08L 81/06: Polysulfones; Polyethersulfones
- C08J 2381/00: Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
- C08L 81/00: Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
- 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)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Molding compositions or mixtures comprising a high-temperature-resistant polymer and at least one polymer containing sulfoxide groups are used for the production of a foam by exposure to heat. The foam is employed for heat-resistant insulating layers.

## Claims

### Claim 1

A process for the production of a polymer foam, comprising the step of heating a molding composition comprising A) at least one high-temperature-resistant polymer, B) at least one polymer, different from (A) containing surfoxide groups in an amount of from 1 to 99% by weight, based on the total polymer content of the molding composition, and C) optionally conventional additives to a temperature in the range from 300.degree. C. to 470.degree. C.

### Claim 2 (depends on 1)

The process as claimed in claim 1, wherein the temperature is in the range of from 300.degree. C. to 350.degree. C.

### Claim 3 (depends on 1)

The process as claimed in claim 1, wherein the heating is carried out for a time period of from 5 to 60 minutes.

### Claim 4 (depends on 1)

The process as claimed in claim 1, wherein the heating is carried out for a time period of from 5 to 30 minutes.

### Claim 5 (depends on 1)

The process as claimed in claim 1, wherein the polymer foam formed has a density at least 50 percent lower than that of the unfoamed material.

### Claim 6 (depends on 1)

Method for the preparation of moldings by shaping a foam as produced according to claim 1 to give said molding.