Process of making articles of foamed polymethyl methacrylate

Details Process of making articles of foamed polymethyl methacrylate Process of making articles of foamed polymethyl methacrylate

1982-06-08

1985-07-23

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 53, 26433118, 264DIG5, 264DIG13, 425817R, B29D 2704

Patent

active

045308063

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.

REFERENCES:
patent: 3458248 (1969-07-01), Eversole
patent: 3661807 (1972-05-01), Seiner
patent: 3663670 (1972-05-01), Swayne et al.
patent: 3673126 (1972-06-01), Carmody et al.
patent: 3813462 (1974-05-01), Roberts
patent: 3823027 (1974-07-01), Wismer et al.

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