Copolymer sealant compositions and method for making
AssigneeGeneral Electric Company
InventorsNavjot Singh, John Thomas Leman, John M. Whitney, Herman Otto Krabbenhoft
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Abstract
Condensation curable poly(fluoroorgano)siloxane-poly(silarylene)siloxane block copolymer compositions having a glass transition temperature not exceeding about −54° C. and excellent solvent resistance have been found useful as sealants. Polyalkoxysilylorgano compounds, such as 1,4-bis[trimethoxysilyl(ethyl)]benzene have been found to be effective as cross-linkers.
Claims25
A condensation curable poly(fluoroorgano)siloxane-poly(silarylene)siloxane block copolymer exhibiting a glass transition temperature not exceeding about −54° C.
A depolymerization resistant condensation curable poly(fluoroorgano)siloxane-poly(silarylene)siloxane block copolymer exhibiting a glass transition temperature not exceeding about −54° C. and a weight average molecular weight in the range between about 60,000 and about 190,000 wherein the copolymer comprises the reaction product of 1,4-bis(dimethylhydroxysilyl)benzene chemically combined with tris[(trifluoropropyl)methyl]cyclosiloxane.
A method for making a poly(fluoroorgano)siloxane-poly(silarylene)siloxane copolymer comprising effecting reaction between bis(diorganoysilyl)arylene and poly(fluoroalkylorgano)cyclopolysiloxane.
A method for making a depolymerization resistant poly(fluoroorgano)siloxane-polysilarylenesiloxane copolymer having a glass transition temperature not exceeding about −54° C. and a weight average molecular weight in the range between about 60,000 and about 190,000, comprising effecting reaction between 1,4-bis(dimethylhydroxysilyl)benzene and tris[(trifluoropropyl)methyl]cyclosiloxane in the presence of sodium fluorosilanolate and silyl phosphate at a temperature in a range between about 60° C. and about 150° C.
Dependencies are inferred from the claim text.