Patent · US Active

Improving the properties in PMMA foams by using methacrylic amides

US11155662B2 · kind B2 · utility

3Cited by

4References

20Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

Thomas Richter · Wauseon, US
Christoph Seipel · Babenhausen, DE
Kay Bernhard · Darmstadt, DE

Key dates

Filing date	Aug 31, 2017
Grant date	Oct 26, 2021
Priority date	—
Expiry date	Jan 2, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2333/12
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The present invention relates to novel PMMA foams and the production thereof. Here, polymers which have been obtained by copolymerization of methacrylamides such as N-isopropylmethacrylamide and without styrene are foamed. It has surprisingly been possible to establish that a stable, simple-to-produce PMMA foam which has very good properties, e.g. a very high compressive strength, and can be joined more simply to covering layers, especially in comparison with known PMMA foams, can be obtained according to the invention.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.