Silicone adhesive formulations

Claim 1

In a silicone pressure sensitive adhesive composition comprising 45 to 75 parts by weight of a silicone resin and 25 to 55 parts by weight of a silicone polymer gum, the improvement comprising adding to said composition 0.5 to 50 parts by weight, based on a total of 100 parts by weight of the resin and polymer gum, of a cluster compound selected from the group consisting of (A) RSi{OSi(OR') 3 } 3 , (B) M<OSi{OSi(OR') 3 } 3 > a , (C) M<OSiR{OSi(OR') 3 } 2 > a , and ##STR3## wherein R is hydrogen, an alkyl, alkenyl, aryl or aralkyl group, R' is hydrogen, an alkyl, alkenyl, aryl or aralkyl group with the proviso that at least a majority of the R' radicals are sterically hindered alkyl groups having at least 3carbon atoms, M is a substituted or unsubstituted branched or straight chain hydrocarbon radical, a is 2, 3, or 4, n is an integer from 0 to 300, R" is hydrogen, an alkyl, alkenyl, aryl, aralkyl or --OSi(OR') 3 group, and R''' is hydrogen, an alkyl, alkenyl, aryl, aralkyl, hydroalkyl, and halo or cyano substituted alkyl, alkenyl, aryl, aralkyl, and hydroalkyl.