Molding compounds, sponge articles produced therefrom and proces

Details Molding compounds, sponge articles produced therefrom and proces Molding compounds, sponge articles produced therefrom and proces

1982-07-19

1984-06-26

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 81, 521 95, 521139, 521140, 521915, 525 92, 525 98, 525 99, 525901, C08J 910, C08L 5302

Patent

active

044567065

ABSTRACT:
A molded object having a sponge-like interior surrounded by a skin, molding composition from which it is produced, and the method for producing the article. Copolymers of vinyl-substituted aromatic compounds containing from 8-18 carbon atoms copolymerized with conjugated diene having from 4-12 carbon atoms and polymer chosen from among solid resinous polymers of vinyl-substituted aromatic compounds present in amounts ranging from about 10 to about 75 parts by weight per 100 parts by weight of the copolymer and solid resinous copolymers of ethylene present in an amount of about 5 to about 50 parts by weight per 100 parts by weight of the copolymer are blended with a sufficient amount of polarizing agent to achieve rapid heating through response to microwave treatment, blowing agent in an amount sufficient to provide a sponge-like, rubbery porosity to an article molded therefrom, and, optionally, cellular control agent. Composition is melted at a temperature that activates the blowing agent, molded, and removed from the mold as an article having a sponge-like interior surrounded by polymeric skin.

REFERENCES:
patent: 4206850 (1981-03-01), Thorsud
patent: 4306034 (1981-12-01), Thorsud
patent: 4352854 (1982-10-01), Siedenstrang et al.

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