Method for producing polymethacrylimide foams

Details Method for producing polymethacrylimide foams Method for producing polymethacrylimide foams

2007-01-30

2007-01-30

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

C521S094000, C521S117000, C521S183000

Reexamination Certificate

active

10486361

ABSTRACT:
The invention relates to an improved method for producing foamed material, especially poly(meth)acrylimide foams, which are foamed from polymer plates produced according to the casting method. The two-step method consists of a pre-heating step and at least one foaming step. The product obtained has a significantly smaller compressive strain, measured according to DIN 53425(ASMD 621), than prior art products.

REFERENCES:
patent: 3593848 (1971-07-01), Landau
patent: 3812225 (1974-05-01), Hosoda et al.
patent: 6670405 (2003-12-01), Servaty et al.
patent: 36 30 930 (1988-03-01), None
patent: 00 63280 (2000-10-01), None
Patent Abstracts of Japan vol. 016, No. 212 (M-1250), May 19, 1992 & JP 04 037529 A (Sekisui Chem Co Ltd), Feb. 7, 1992 abstract.

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