Foamable synthetic resin compositions

Details Foamable synthetic resin compositions Foamable synthetic resin compositions

1986-05-12

1987-05-12

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521149, 521153, 521910, 264DIG5, C08J 914

Patent

active

046651047

ABSTRACT:
A foamed polymethacrylimide resin having improved creep resistance at high temperature and reduced moisture absorption is obtained by heating a foamable resin composition consisting of (1) a copolymer formed between 47 to 53 percent by weight of methacrylonitrile monomer, 53 to 47 percent by weight of methacrylic acid monomer, and 0.01 to 4 percent, by weight of said monomers, of a metal salt of acrylic or methacrylic acid, and (2) 0.5 to 4 percent, also by weight of the monomers, of a blowing agent mixture of formamide or monomethyl formamide and a monohydric aliphatic alcohol having from 3 to 8 carbon atoms in the molecule.

REFERENCES:
patent: 3627711 (1971-12-01), Schroeder et al.
patent: 3734870 (1973-05-01), Schroeder et al.
patent: 4139685 (1979-02-01), Schroeder
patent: 4187353 (1980-02-01), Schroeder
Chem. Abstr. 77, 21066f.

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