Recyclable thermoplastics foam of high glass temperature

Details Recyclable thermoplastics foam of high glass temperature Recyclable thermoplastics foam of high glass temperature

1993-09-28

1994-04-05

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 85, 521 92, 521 93, 521 97, 521150, 521182, 521189, C08J 912

Patent

active

053005430

ABSTRACT:
A thermoplastic molding composition suitable for the preparation of foam is disclosed. The composition comprises a thermoplastic resinous component and a foaming agent which includes A) (i) 0.01 to 4.8% alumina hydrate (aluminum hydroxide) in combination with (ii) 0.01 to 4.8% of an acidic additive or B) 0.01 to 4.8% of the reaction product of said (i) and said (ii), the percentages being relative to the weight of the composition to be foamed. The invention is based on the finding that the foaming of the composition does not lead to any significant reduction in molecular weight of the resinous component or to troublesome discoloration of the foam, even during its re-extrusion.

REFERENCES:
patent: 3277929 (1966-10-01), Chadwick et al.
patent: 3969313 (1976-07-01), Aishima et al.
patent: 4407768 (1983-10-01), Garcia et al.
patent: 4446254 (1984-05-01), Nakae et al.
patent: 4889875 (1989-12-01), Aust et al.
patent: 5132331 (1992-07-01), Kohler et al.
Patent Abstract of Japan, vol. 4, No. 65, May 16, 1990, JP 55-31871, Mar. 6, 1980.
Abstract of JP 520445667.
Chemical Abstracts, vol. 89, 1978 Abstract No. 44653g, Kubo et al, Thermoplastic Foams & JP-A-7 829 368 (Matsushita Electric Works Ltd).

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