Foams of silicates and poly(meth)acrylic acids

Details Foams of silicates and poly(meth)acrylic acids Foams of silicates and poly(meth)acrylic acids

C - Chemistry, Metallurgy

08

J

403/11

C08J 9/00 (2006.01) C04B 28/24 (2006.01) C08K 3/34 (2006.01) C08L 33/02 (2006.01) C08L 83/02 (2006.01)

Patent

CA 1193049

Foams of silicates and poly(meth)acrylic acids Abstract Inorganic-organic foams are obtained by foaming a mixture of (a) a 5 to 60% by weight aqueous alkali metal silicate or ammonium silicate solution, (b) a sufficient amount of a conventional hardener for aqueous silicate solutions, (c) a polymer of (meth)acrylic acid or a copolymer of acrylic acid and methacrylic acid or of (meth)acrylic acid and a copolymerisable monomer containing ethylinic double bonds, the polymer and copolymer being soluble in the aqueous silicate solution, some or all the carboxyl groups of the polymer or copolymer, where relevant, being neutralised by a base and the amount of polymer or copolymer being 0.1 to 30 parts per 100 parts of SiO2 contained in the aqueous silicate solution, (d) a blowing agent, (e) a surfactant having a foaming action and, where relevant, (f) gelling agent for solidifying the foam before har- dening and/or conventional fillers, and allowing the foam to harden. The foams can be used as insulating materials in the construction industry.

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