Method of manufacturing a foamed plastic and subsequently polyme

Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating porous product

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264425, 264 53, 264129, B29C 4406

Patent

active

055628770

ABSTRACT:
A foamed plastic manufactured by foaming a mixture of a resin and a volatile polymerizable foaming agent, wherein the pressure in the foams of the foamed plastic is less than atmospheric pressure, is disclosed. Further, a foamed plastic manufactured by hermetically sealing with an airtight film and foaming a mixture of a resin and a volatile polymerizable foaming agent, wherein the pressure in a gap region between the airtight film and the foamed plastic and the pressure in the foams of the foamed plastic are less than atmospheric pressure is disclosed. Further, a method of manufacturing foamed plastic comprising foaming a mixture of a volatile polymerizable foaming agent and a resin, and irradiating the foamed plastic with an energy beam. According to the invention, to enhance the heat insulation and soundproof performance a volatile liquid polymerizable monomer is used as foaming agent, and irradiated with an energy beam to polymerize the foaming agent after forming, and to maintained a reduced internal pressure, the foamed plastic is further covered by a metal film or laminated film.

REFERENCES:
patent: 3723318 (1973-03-01), Butler
patent: 4038350 (1977-07-01), Jaques
patent: 4052347 (1977-10-01), Dieterich et al.
patent: 4419459 (1983-12-01), Melchior
patent: 4530806 (1985-07-01), Melchior
patent: 4898893 (1990-02-01), Ashida
patent: 5137929 (1992-08-01), Demmin et al.
patent: 5169873 (1992-12-01), Behme et al.
Database WPIL (Derwent), accession No. 83-15929K(07), Derwent Publications Ltd., London, GB & JP-A-58 011 714 (Shinetsu Chem. Ind. K.K.) Jan. 7, 1983 .

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