Silicone rubber powder and method for the preparation thereof
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsAsao Harashima, Yoshitsugu Morita, Ryuji Tachibana
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Abstract
There is disclosed a silicone rubber powder prepared from a curable silicone composition, said powder comprising a polyorganosiloxane drain having at least one silicon-bonded polyoxyalkylene group of the formula --R.sup.1 (OR.sup.2).sub.m OR.sup.3 wherein R.sup.1 is an alkylene radical, R.sup.2 is an alkylene radical, R.sup.3 is selected from the group consisting of hydrogen and alkyl radicals and m is an integer having a value of 2 to 100. The rubber powder is preferably prepared by curing the above silicone composition to form a cured silicone rubber and then pulverizing the silicone rubber.
Claims18
A cured silicone rubber powder prepared from a curable silicone composition, said powder comprising a polyorganosiloxane chain having at least one silicon-bonded polyoxyalkylene group of the formula
- --R.sup.1 (OR.sup.2).sub.m OR.sup.3
- wherein R.sup.1 is an alkylene radical having 1 to 20 carbon atoms, R.sup.2 is an alkylene radical having 1 to 20 carbon atoms, R.sup.3 is selected from the group consisting of hydrogen and alkyl radicals having 1 to 10 carbon atoms and m is an integer having a value of 2 to 100.
A method for preparing a silicone rubber powder, said method comprising:
- (I) curing a curable silicone composition comprising a polyorganosiloxane which contains at least one silicon-bonded polyoxyalkylene group of the formula
- --R.sup.1 (OR.sup.2).sub.m OR.sup.3
- wherein R.sup.1 is an alkylene radical having 1 to 20 carbon atoms, R.sup.2 is an alkylene radical having 1 to 20 carbon atoms, R.sup.3 is selected from the group consisting of hydrogen and alkyl radical having 1 to 10 carbon atoms and m is an integer having a value of 2 to 100 to provide a cured silicone rubber;
- and
- (II) pulverizing said cured silicone rubber.
A cured silicone rubber powder prepared by a method comprising:
- (I) curing a curable silicone composition comprising a polyorganosiloxane which contains at least one silicon-bonded polyoxyalkylene group of the formula
- --R.sup.1 (OR.sup.2).sub.m OR.sup.3
- wherein R.sup.1 is an alkylene radical having 1 to 20 carbon atoms, R.sup.2 is an alkylene radical having 1 to 20 carbon atoms, R.sup.3 is selected from the group consisting of hydrogen and alkyl radical having 1 to 10 carbon atoms and m is an integer having a value of 2 to 100 to provide a cured silicone rubber;
- and
- (II) pulverizing said cured silicone rubber.
Dependencies are inferred from the claim text.