Organosilicon prepolymers
AssigneeHercules Incorporated
InventorRaymond T. Leibfried
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Abstract
A novel organosilicon prepolymer, which is the partial reaction product of (a) a cyclic polysiloxane or a tetrahedral siloxysilane containing at least two hydrosilane groups and (b) a polycyclic polyene having in its rings at least two chemically distinguishable carbon-carbon double bonds, wherein the ratio of carbon-carbon double bonds in the rings of (b) to hydrosilane groups in (a) is greater than 0.5:1 and up to 1.8:1, and at least one of the compounds (a) and (b) has more than two reactive sites, a method for making the organosilicon prepolymer, and a method for preparing an organosilicon polymer therefrom, are disclosed.
Claims48
An organosilicon prepolymer which is the partial reaction product of (a) a cyclic polysiloxane or a tetrahedral siloxysilane containing at least two .tbd.SiH groups and (b) a polycyclic hydrocarbon polyene having in its rings at least two chemically distinguishable carbon-carbon double bonds, wherein the ratio of carbon-carbon double bonds in the rings of (b) to .tbd.SiH groups in (a) is greater than 0.5:1 and up to 1.8:1, at least one of the compounds (a) and (b) has more than two reactive sites and wherein 30% to 65% of the .tbd.SiH groups are reacted.
The process of forming a fiber reinforced composite material as claimed in claim 44, wherein the ratio of carbon-carbon double bonds in (b) to hydrosilane groups in the rings of (a) is in the ratio of about 0.7:1 up to 1.3:1.
Dependencies are inferred from the claim text.