Process of making articles of foamed polymethyl methacrylate
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United States of America Patent
Stats
-
Jul 23, 1985
Grant Date -
N/A
app pub date -
Jun 8, 1982
filing date -
Jun 25, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a process of making articles of foamed polymethyl methacrylate (PMMA). In a first process stage a mixture comprising monomeric methyl methacrylate, plasticizer, preferably liquid foaming agent and catalyst is polymerized by heating and/or irradiation to form a foaming agent-containing solid body. In the second process stage this body is foamed by heating to the softening temperature of the plastic material. Either of these stages may also be performed continuously. The final product is clear-transparent and has large closed cells, a smooth surface, is light- and weather-resistant, readily workable, has good thermal insulation properties also in combination with plastics or glass coatings and may be used in a variety of applications, especially as a transparent insulating slab or plate.
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