Patent ID: 6251327
Filing Date: 2001-06-26
Classification: C08G,C08K,C08L

Abstract:
A method of increasing the mold life of a silicone elastomer mold, said method comprising the steps of:I) preparing a curable organosiloxane composition, comprising:A) an alkenyl-containing polyorganosiloxane having an average of at least two silicon-bonded alkenyl groups per molecule;B) an organohydrogensiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule;C) a hydrosilylation reaction catalyst, in a concentration sufficient to promote curing of a mixture of Component (A) and Component (B); andD) a free radical scavenger for radicals that participate in the free radical polymerization of styrene;wherein the sum of the average number of silicon-bonded alkenyl groups in Component (A) and the average number of silicon-bonded hydrogen atoms per molecule in Component (B) is great than 4;II) preparing a curable polyester composition comprising a styrene monomer;III) curing the curable organosiloxane composition to form a silicone elastomer mold;(IV) casting parts in the silicone elastomer mold using a curable polyester composition; and(V) curing the curable polyester composition to form a cured polyester part; and(VI) removing the cured polyester part from the silicone elastomer mold.