Patent ID: 6194340
Filing Date: 2001-02-27
Classification: C07F,C08F,Y10S

Abstract:
A method of increasing the stability of a siloxy-aluminoxane, which method comprises:a) forming a solution of a siloxy-aluminoxane composition by mixing a hydrocarbylsiloxane with an aluminoxane in an organic solvent medium in which the molar ratio of aluminum to hydrocarbylsiloxane is from 1:1 to 1000:1, wherein the aluminoxane used has been formed by partial hydrolysis of aluminum trialkyl, and wherein the hydrocarbylsiloxane used is free of hydroxyl groups; andb) heating the solution of the siloxy-aluminoxane composition under reduced pressure to form a more concentrated solution and to thereby form a siloxy-aluminoxane composition having greater solution stability than the siloxy-aluminoxane composition formed in a).