Method and composition for air bladder release during tire production

Claim 1

A release composition for the application to expandable items, comprising: a fluid blend having release properties enduring multiple repetitions of expansion and contraction of the expandable item, said fluid blend comprising from about 20 to about 80 parts of an adhesion agent, from about 4 to about 25 parts of a curing agent, from about 5 to about 80 parts of a slip agent, and from about 20 to about 80 parts of a release agent; wherein said adhesion agent is an amino-functional di-organopolysiloxane resin having the following formula: ##STR7## where v is a number up to 20,000; where R represents a divalent radical selected from the group consisting of a divalent hydrocarbon radical having from 1 to 10 carbon atoms, (OCH 2 ) r , (OC 2 H 4 ) r , (OC 3 H 6 ) r , where r is a number from 1 to 50, and an unsaturated divalent hydrocarbon radical having from 2 to 10 carbon atoms; where R' represents a monovalent radical having from 1 to 18 carbon atoms and selected from the group consisting of: hydrocarbons and halogenated hydrocarbons, where R" is selected from the group consisting of hydrogen, and a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, R" being the same or different in bonding to N; said curing agent having the following formula: ##STR8## where n is a number up to 30, where R represents the same divalent radicals as described in said formula for said adhesion agent, and where R' represents the same monovalent radicals as described in said formula for said adhesion agent; said slip agent selected from the group consisting of polyalkylene glycols and di-organopolysiloxane fluids, and combinations thereof, said polyalkylene glycols having the following formula: ##STR9## where R'" is an alkylene radical or an alkoxy-substituted alkylene radical having from 1 to 8 carbon atoms, and combinations thereof, and where t is a number from 2 to 80; said di-organopolysiloxane fluids having the following formula: ##STR10## where w is a number greater than 5 and where R' represents the same monovalent radicals as described in said formula for said adhesion agent; wherein said di-organopolysiloxane fluids have a viscosity range from about 100,000 to about 2,500,000 centipoise; and said release agent selected from the group consisting of silazane fluids, mono-organopolysiloxane fluids and combinations thereof, said silazane fluids having the following formula: ##STR11## where s is a number from 1 to 30, where R' represents the same monovalent radicals as described in said formula for said adhesion agent, and where R" represents hydrogen and the same monovalent radicals as described in said formula for said adhesion agent; said mono-organopolysiloxane fluids having the following formula: ##STR12## where w is a number greater than 5 and where R' represents the same monovalent radicals as described in said formula for said adhesion agent.