C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/185, 261/45
C01B 33/32 (2006.01) C01B 33/24 (2006.01) C04B 28/00 (2006.01) C04B 28/26 (2006.01)
Patent
CA 1142733
Abstract of the Disclosure Prepolymers of alkali metal silicates and/or alkaline earth metal silicates and metal oxides, which can be used as moulding compositions preferably compression moulding compositions, for the production of compression- mouldable laminates or of insulating sheets, are obtained by a method wherein a mixture of solid alkali metal sili- cates and/or alkaline earth metal silicates, and/or aqueous solutions of such silicates, with or without addition of water, and of divalent to tetravalent metal oxides, the ratio of metal oxide to silicate in the mix- ture being from 1:1 to 1:9, expressed in parts by weight of solids, and the homogenised mixture having a water content of from 10 to 50% by weight, based on the total amount of mixture is allowed to pre-react in the temperature range of 10 to 50°C until the water content of the mixture has decreased by from 0.1 to 25% by weight and a product which is sufficiently tough and dry to permit communution is obtained. and this product is communuted and then heated at temperatures of up to 120°C until the prepolymer obtained has a water content of from 20 to 2% by weight.
310485
Forster Ewald
Kartschmaroff Peter
Schaffner Armin
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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