Abstract: A solution comprising a composition and a volatile silicone solvent overcomes the environmental disadvantages associated with volatile organic compounds. The invention particularly provides for a primer composition for bonding silicone elastomers to metals that is free of volatile organic compounds comprises an epoxy alkoxy silane, a titanium ortho alcoholate or ortho ester, a silicon ortho alcoholate or ortho ester and a volatile silicone compound.

Abstract: A solution comprising a composition and a volatile silicone solvent overcomes the environmental disadvantages associated with volatile organic compounds. The invention particularly provides for a primer composition for bonding silicone elastomers to metals that is free of volatile organic compounds comprises an epoxy alkoxy silane, a titanium ortho alcoholate or ortho ester, a silicon ortho alcoholate or ortho ester and a volatile silicone compound.

Abstract: A heat cured fluorosilicone rubber exhibiting improved compression set comprises N,N'-meta-phenylenedimaleimide.

Abstract: A polyfluoroalkyl silicone having the general formula:M.sub.a M'.sub.b D.sub.c D'.sub.d T.sub.e T'.sub.f Q.sub.g ;whereM=R.sup.1.sub.u R.sup.2.sub.v R.sup.3.sub.w SiO.sub.1/2 with the sum of the subscripts u+v+w being 3 and the subscripts v and w are each independently 0 or 1;M'=R.sup.4 R.sup.5 R.sup.6 SiO.sub.1/2 ;D=R.sup.7.sub.x R.sup.8.sub.y SiO.sub.2/2 with the sum of the subscripts x+y being 2 and y is 0 or 1;D'=R.sup.9 R.sup.10 SiO.sub.2/2 ;T=R.sup.11.sub.z SiO.sub.3/2 with the subscript z being 1;T'=R.sup.12 SiO.sub.3/2 ; andQ=SiO.sub.4/2 ;where the substituent groups R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.8, R.sup.9, R.sup.10, and R.sup.12 are each independently selected from the group of one to forty carbon atom monovalent hydrocarbon radicals, the subscripts a, b, c, d, e, f, and g are zero or positive integers with the substituent groups, R.sup.1, R.sup.7, and R.sup.11, each independently selected from the group of consisting of monovalent polyfluoroalkyl groups having the formula CF.

Abstract: A polyfluoroalkyl silicone having the general formula:M.sub.a M'.sub.b D.sub.c D'.sub.d T.sub.e T'.sub.f Q.sub.g ;whereM=R.sup.1.sub.u R.sup.2.sub.v R.sup.3.sub.w SiO.sub.1/2 with the sum of the subscripts u+v+w being 3 and the subscripts v and w are each independently 0 or 1;M'=R.sup.4 R.sup.5 R.sup.6 SiO.sub.1/2 ;D=R.sup.7.sub.x R.sup.8.sub.y SiO.sub.2/2 with the sum of the subscripts x+y being 2 and y is 0 or 1;D'=R.sup.9 R.sup.10 SiO.sub.2/2 ;T=R.sup.11.sub.z SiO.sub.3/2 with the subscript z being 1;T'=R.sup.12 SiO.sub.3/2 ; andQ=SiO.sub.4/2 ;where the substituent groups R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.8, R.sup.9, R.sup.10, and R.sup.12 are each independently selected from the group of one to forty carbon atom monovalent hydrocarbon radicals, the subscripts a, b, c, d, e, f, and g are zero or positive integers with the substituent groups, R.sup.1, R.sup.7, and R.sup.11, each independently selected from the group of consisting of monovalent polyfluoroalkyl groups having the formula CF.

Abstract: Methyl- and phenyl-containing fluorosilicone terpolymeric fluids over the range of 30 cps to 200,000 cps are effective as additives for various uses. Over the range of 16,000 to 200,000 cps, the fluids are effective as additives in promoting a finger transferable self-bleed of lubricant in fluorosilicone-containing heat-curable rubber compositions, even after a post-bake of the composition. Over the viscosity range of 30 cps to 1000 cps, the fluids are useful in personal care and cosmetic products as water and oil repellency additives. Methods of ring opening polymerization are used to produce the terpolymeric fluids from cyclic reactants.

Abstract: A thin fluorosilicone elastomer coating which prevents oil weepage problems with silicone rubber gaskets wherein the fluorosilicone elastomer coating contains a vinyl-containing fluorosilicone polymer cured with a hydrogen-containing siloxane/platinum group hydrosilation catalyst curing system used in combination with a peroxide curing agent.

Abstract: A method of polymerizing organosiloxane monomers to produce high molecular weight polymers having a relatively narrow range of molecular weights, which includes drying the monomers to a selected moisture content of 10 ppm or less by moisture transfer contact with a desiccant at temperatures below the polymerization temperature prior to polymerization.

Abstract: A method is provided for making a polyfluoroalkylsiloxane fluid in the form of a homopolymer, copolymer, or terpolymer, by polymerizing polyfluoroalkylsiloxane trimer in the presence of a mixture containing an effective amount of water and a strong acid catalyst, such as trifluoromethanesulfonic acid.

Abstract: Heat cured silicone rubber compositions which contain a potassium aluminosilicate filler exhibit improved resistance to hydrocarbon oils. The potassium aluminosilicate filler has an average surface area of between about 5.0 and about 6.50 m.sup.2 /g, an average particle diameter of between about 1.0 and about 20.0 micrometers, and an average particle thickness of between about 0.5 and 1.0 micrometers. The filler improves retention of physical properties and resistance to swelling in hot hydrocarbon oils in a wide variety of siloxane compositions.

Abstract: A heat curable fluorosilicone rubber composition having improved heat stability without a sacrifice in physical properties is provided by using critical amounts of cerium hydroxide and red iron oxide in the preparation of the curable fluorosilicone composition.

Abstract: Novel fluorosilicone hydrides are provided which are useful as intermediates in the preparation of epoxy-functional fluorosilicones having improved cure efficiency at low temperatures and improved resistance to solvents and fuels than analogous non-fluoro-functional epoxy-functional silicones prepared from non-fluoro-functional silicone hydrides.

Abstract: A treatment for finely divided silica reinforcing fillers is provided which comprises heating the silica filler in the presence of a fluoroalkyl-functional diorganopolysiloxane. The treated fillers are especially compatible with fluorosilicone gums, and fluorosilicone rubbers made using said fillers exhibit improved mechanical properties, especially tear strength and compression set.

Abstract: Novel epoxy-functional fluorosilicones and UV-curable compositions containing these epoxy-functional fluorosilicones in combination with onium salt photoinitiators are provided, the UV-curable compositions having improved cure efficiency and improved solvent and fuel resistance as compared to epoxy-functional silicones containing only non-fluorinated organic groups. Such compositions are useful as conformal coatings, optical fiber coatings, and electrical encapsulation.

Abstract: A process is disclosed whereby silica filler may be surface treated in situ following addition to a curable polysiloxane gum.

Abstract: There is provided a fluorosilicone composition comprising:(1) a cyclic trimer represented by the general formula: ##STR1## wherein R.sup.1 is C.sub.1-8 alkyl, preferably methyl; R.sup.2 is C.sub.1-8 haloalkyl, preferably trifluoropropyl; and x ranges from 3 to 10 and averages about 6;(2) water; and(3) a mixture comprising by weight about 20% to about 52% of a polar aprotic solvent and about 80% to about 48% of an organic nonaprotic solvent.

Abstract: In a heat curable silicone rubber composition comprising a polydiorganosiloxane base polymer and a curing catalyst, the improvement comprising an effective amount of co-curing agent. Preferably, the co-curing agent has the general formula ##STR1## where R is H or a C.sub.1-5 alkyl radical, R.sup.1 is a C.sub.1-5 alkylene radical, each R.sup.2 is independently selected from H and CH.sub.3, R.sup.3 is H or CH.sub.3, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.

Abstract: Sodium fluorosilanolate catalyst is disclosed which has improved effectiveness as a catalyst to produce fluorosilicone polymer and which at the same time improves fluorosilicone polymer purity.

Abstract: There is provided a process for producing low molecular weight silanol end-stopped diorganopolysiloxanes containing an average of 3 to 10 diorganosiloxy units and averaging 5 diorganosiloxy units comprising contacting a cyclic trimer of the formula:(R.sup.2 SiO).sub.3where R.sup.2 is a halogenated monovalent hydrocarbon radical and R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals with a mixture comprising an aprotic solvent and water and separating the desired product after the hydrolysis.

Abstract: Fluorosilicone heat cured rubber compositions are prepared using a chain modifier mixture comprising vinyl terminated polysiloxanes and silanol terminated siloxanes which allow vinyl-on-chain-ends functionality to easily crosslink unhindered by perfluoroalkyl groups.