SECONDARY COATING COMPOSITIONS FOR GLASS FIBERS, GLASS FIBERS COATED WITH THE SAME AND COMPOSITES REINFORCED THEREWITH

摘要

The present invention includes aqueous coating compositions adapted to coat a plurality of sized glass fibers, glass fibers coated with the same and composites reinforced with the coated glass fibers. The coating composition includes (a) a polysiloxane having: (1) an alkyl substituent attached through a carbon atom directly to a silicon atom of the polysiloxane; (2) an alkoxy substituent attached through a carbon atom directly to a silicon atom of the polysiloxane, the alkoxy substituent comprising an alkyl group, an alkyl ether group and a terminal group selected from the group consisting of hydrogen and an alkoxy group having about 1 to about 8 carbon atoms; and (3) endblocking groups independently selected from the group consisting of a phenyl group, an alkyl group having about 1 to about 20 carbon atoms and combinations thereof, wherein the polysiloxane is essentially free of silicon-bonded hydroxy groups and alkoxy groups attached through an oxygen atom directly to a silicon atom of the polysiloxane, and (b) zero to less than about 50 weight percent on a total solids basis of a film-forming material capable of forming a uniform continuous coating on the glass fibers.