Process of producing transparent foamed plastics materials
First Claim
1. A process of producing transparent foamed plastics, comprising mixing (i) a polymerizable composition consisting essentially of methyl methacrylate and a polymerization catalyst and which does not contain a blowing agent, and (ii) at least one component selected from the group consisting of(a) solid beads comprising a mixture of at least one transparent polymethylmethacrylate and blowing agent, and(b) solid beads comprising at least one transparent polymethylmethacrylate with blowing agent containing micro-capsules enclosed therein,heating and expanding said beads and polymerizing said polymerizable composition.
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Accused Products
Abstract
The present invention relates to processes of producing transparent foamed plastics, particularly foamed acrylate and methacrylate materials, in the form of e.g. panels, molded articles, or as cores for laminate bodies. Solid beads of transparent polymer material and containing a blowing agent are mixed with a reaction resin, softened by heating or swelling, and expanded to large pore size. During the blowing the beads may be displaced relative to one another. Subsequently the reaction resin is completely polymerized. The so obtained foamed plastics panels, which have large closed cells with contiguous faces and a smooth, non-porous surface, are particularly useful as insulating and building material exhibiting good transparency and protection against loss of heat, especially for greenhouses.
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Citations
10 Claims
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1. A process of producing transparent foamed plastics, comprising mixing (i) a polymerizable composition consisting essentially of methyl methacrylate and a polymerization catalyst and which does not contain a blowing agent, and (ii) at least one component selected from the group consisting of
(a) solid beads comprising a mixture of at least one transparent polymethylmethacrylate and blowing agent, and (b) solid beads comprising at least one transparent polymethylmethacrylate with blowing agent containing micro-capsules enclosed therein, heating and expanding said beads and polymerizing said polymerizable composition.
Specification