Bladder lubricant composition for tire molding

Claim 1

In a method for forming a cured rubber tire by heating an uncured rubber tire within the confines of a mold, wherein a rubber bladder coated with a lubricant is first inserted into said uncured rubber tire and then inflated during said heating, the improvement comprising using as said lubricant a composition consisting essentially of: (A) about 50 to 90 weight percent of an organopolysiloxane resin consisting essentially of about 10 to 90 weight percent Ph--SiO 3/2 siloxane units, in which Ph denotes a phenyl group, and about 90 to 10 weight percent (CH 3 ) 2 SiO 2/2 siloxane units; (B) about 2 to 35 weight percent of an organosilane selected from the group consisting of an organosilane represented by the formula ##STR9## and an organosilane represented by the formula R--Si(OR.sup.1).sub.3 wherein R, R 1 and R 2 in the above formulas are monovalent hydrocarbon groups; (C) about 0.1 to 10 weight percent of a condensation catalyst; and (D) from about 1 to 10 weight percent of at least one diorganopolysiloxane having terminal groups selected from the group consisting of hydroxyl and alkoxy groups.