Formed plastic and method of manufacturing the same

Stock material or miscellaneous articles – Sheet including cover or casing – Foamed or expanded material encased

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4283055, 4283186, 521 50, 521 99, 521110, 521128, 521134, 521136, 521142, 521146, 521155, 522 6, 523400, B32B 314

Patent

active

055872204

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: 4025687 (1977-05-01), Wooler et al.
patent: 4122203 (1978-10-01), Stahl
patent: 4419459 (1983-12-01), Melchior
patent: 4898893 (1990-02-01), Ashida
patent: 5137929 (1992-08-01), Demmin et al.
patent: 5169873 (1992-12-01), Behme et al.
patent: 5461083 (1995-10-01), Ogawa
Database WPIL (Derwent), accession No. 83-15929K(07), Derwent Publications Ltd., London, GB & JP-A-58 011 714 (Shinetsu Chem. Ind. K.K.) Jul. 1, 1983.
CA--99: 158,922, Dec. 1983.

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