Method of producing foamed polymer materials

Details Method of producing foamed polymer materials Method of producing foamed polymer materials

1994-07-29

1996-08-20

Seidleck, James J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 99, 521113, 521128, 521130, 521136, 521187, C08J 908

Patent

active

055479960

ABSTRACT:
Reacting carbonyls, such as aldehydes and ketones, with amines produces a ketimine or aldimine and a water byproduct. When the ketimine or aldimine reaction occurs in a polymer composition, the polymer becomes foamed due to the evolution of water. Hence, carbonyl and amine containing compounds may be introduced into a polymeric composition to serve as an in-situ blowing agent. The carbonyl and amine containing compounds may be different polymers which will be combined through a ketimine or aldimine linkage to form a graft co-polymer, they may be small molecular weight additives that are placed in the composition with a polymer that is to be foamed as a byproduct of a ketimine or aldimine reaction of the additives, or they may be a polymer containing a carbonyl or amine moiety and a small molecular weight additive compound that will react with the moiety on the polymer to form a ketimine or aldimine.

REFERENCES:
patent: 4975470 (1990-12-01), Matzner et al.
patent: 4990548 (1991-02-01), Gillis et al.
patent: 5114983 (1992-05-01), Stahlke et al.
patent: 5179130 (1993-01-01), Bland et al.
Mohanty, D. K., et al., 32nd Int'l SAMPE Symposium, "Ketimine Modifications as a Route to Novel . . . Poly(Arylene Ether Ketone Homo- and Copolymers", Apr. 6-9, 1987, pp. 408-419.

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