Rigid or semirigid foams and process of making them

Details Rigid or semirigid foams and process of making them Rigid or semirigid foams and process of making them

1974-11-07

1976-09-28

Anderson, Philip

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

260 25P, 264 455, 264 53, 264236, 264331, 264DIG14, 428 71, B29D 2704

Patent

active

039832953

ABSTRACT:
A rigid or semi rigid self-skinned cellular plastic structure which is heat recoverable and thermoelastic is prepared by a process wherein a plastisol or pregelified dry-blend of a homo- or copolymer of vinylchloride (PVC dispersion resin), a polymerizable polyfunctional allyl or vinyl monomer (o-diallyl phthalate), and a peroxide catalyst is prepared, and the plastisol or dryblend is heated so that the reacting mass is free to expand without restraint in at least one direction with a temperature rise of 10.degree.-30.degree.C/minute at least up to the temperature at which expansion of the reaction mass starts. This cellular structure is rigid at normal temperatures and behaves like an elastomer at high temperatures. The product can be subjected to fabrication techniques such as sheet molding, encapsulation expansion from compressed foam etc.

REFERENCES:
patent: 3066110 (1962-11-01), Cornell
patent: 3365353 (1968-01-01), Witman
patent: 3770662 (1973-11-01), Hennessy et al.
patent: 3786004 (1974-01-01), Furuya et al.
patent: 3804933 (1974-04-01), Allan et al.
patent: 3855160 (1974-12-01), Shiotsu et al.
patent: 3857915 (1974-12-01), Crowley

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