Foamable molding compositions

Details Foamable molding compositions Foamable molding compositions

1989-02-02

1989-07-25

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 94, 521138, 521139, 521180, 521182, C08J 906

Patent

active

048514535

ABSTRACT:
A Chemical Blowing Agent (CBA) concentrate was developed comprising a modifying agent and a chemical blowing agent. The CBA is characterized in that its decomposition products contain a primary amine. The modifying agent is a blend of a maleic anhydride copolymer and a butadiene based rubber. It was surprisingly found that resin degradation which often accompanies foam moldings using a CBA of the present type and is expressed in terms of a reduction in the molecular weight of the resin, is much reduced upon the incorporation of the modifying agent and chemical blowing agent of the invention. The concentrate may optionally further comprise a polymeric resin component.

REFERENCES:
patent: 3888801 (1975-06-01), Hunter et al.
patent: 4207402 (1980-06-01), Sprenkle
patent: 4420584 (1983-12-01), Rawlings et al.
patent: 4737523 (1988-04-01), White et al.
patent: 4751250 (1988-06-01), White et al.

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