Abstract: A method for providing polymer-densified fillers consisting essentially of mixing 100 parts of a silicone polymer with 50 to 500 parts of reinforcing filler or 400 to 5000 parts of extending filler and mixing such blend for an amount of time effective for providing a dense, free-flowing particulate mixture.

Abstract: There is provided a method for increasing the bulk density of low bulk density materials by intimately admixing a low bulk density material and an organic or organopolysiloxane liquid and thereafter removing substantially all of said organic or organopolysiloxane liquid, for example, by evaporation.

Abstract: A method for the selective removal of boron halides and other Lewis acid-type impurities from silicon halides is disclosed. Treatment of contaminated silicon halides with siloxanes, which react with the impurities, allow the distillation of silicon halide which is virtually free from contamination within extremely low limits of detectability.

Abstract: There is disclosed a plastic film or metal foil composite sheet containing:(a) a first layer of plastic film or metal foil having firmly adhered to at least one side thereof,(b) a second layer of silicone foam.

Abstract: A heat curable oil extended silicone elastomer composition and the cured silicone elastomers derived therefrom which exhibit improved melt flow and improved tear resistance at high filler loadings. A preferred composition comprises in admixture, a silarylenesiloxane polydiorganosiloxane block copolymer, a dimethylsilicone oil bearing vinyl-type unsaturation, a filler and a catalyst.

Abstract: Diorganopolysiloxane copolymers having a viscosity from 50 to 200,000,000 centipoise at 25.degree. C., are produced by reacting a mixture of (i) a cyclic tetrasiloxane having at least one silicon-bonded organo substituent of three to eight carbon atoms, with (ii) a cyclic siloxane having 3 to 6 siloxane units, (i) being present in an amount of 30 to 98 mol % of the mixture of (i) and (ii), at a temperature in the range of 0.degree. to 90.degree. C. and in the presence of 5 to 300 parts per million of a catalyst comprising cesium hydroxide, a silanolate thereof, or a compound of the formula, ##STR1## wherein R.sup.3 is alkyl of 1 to 8 carbon atoms, cycloalkyl of 4 to 8 carbon atoms or phenyl, B is nitrogen or phosphorous, R.sup.4 is alkyl of 1 to 8 carbon atoms, cycloalkyl of 4 to 8 carbon atoms, phenyl, a siloxane chain of unit formula R.sub.a.sup.5 SiO.sub.(4-a)/2 and mixtures thereof, wherein R.sup.5 is monovalent hydrocarbon or halogenated monovalent hydrocarbon, and a is from 1.5 to 2.5.

Abstract: A process for producing diorganopolysiloxane gums having a viscosity from 1,000 to 100,000,000 centipoise at 25.degree. C., where at least one of the organo substituent groups on the silicon atoms is an aliphatic radical of more than three carbon atoms comprising reacting a cyclic tetrasiloxane or a mixture of cyclic tetrasiloxanes at a temperature in the range of 0.degree. to 90.degree. C. and in the presence of 5 to 300 parts per million of a catalyst selected from the class consisting of cesium hydroxide and ##STR1## where R.sup.2 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms and phenyl, B is selected from the class consisting of nitrogen and phosphorous, R.sup.3 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms, phenyl, siloxane chains of the unit formula R.sub.a.sup.4 SiO.sub.(4-a/2) and mixtures thereof, where R.sup.

Abstract: There is provided process aids for heat cured silicone rubber compositions which are the reaction product of a cyclictrisiloxane, and water or an aliphatic alcohol found in the presence of a catalyst which may be selected from certain moderate to high strength organic acids, lithium hydroxide, ammonia, ammonium hydroxide and primary amines. The advantage of such a process aid is that it is considerably less expensive to produce in silicone manufacturing facilities than the more traditional process aids that have been used in the past.

Abstract: A silyl phosphate which is an improved neutralizing agent for alkali metal hydroxides in silicone reactions, comprising the reaction product of a linear siloxane, and a phosphorous oxyhalogen or phosphoric acid. The reaction products of the phosphorous oxyhalogen over phosphoric acid are preferred. Such a reaction product is preferred for the continuous neutralization of alkali metal hydroxides in the equilibration of siloxanes.

Abstract: There is provided by the present invention a process for producing a solvent resistant block copolymer having desirable processability comprising reacting perfluoroalkylethylene substituted cyclic trisiloxane in the presence of a solvent promoter which may be tetrahydrofuran and in the presence of a dilithium compound catalyst and then adding a diphenyl cyclic trisiloxane and allowing the reaction to go to the completion.

Abstract: There is provided by the present invention a solvent resistant block copolymer having desirable processability comprising a copolymer of the formula, ##STR1## WHERE R is an alkyl radical of 1 to 3 carbon atoms, R.sup.1 is a perfluoroalkyl radical of 1 to 8 carbon atoms, Vi is vinyl, B is selected from the class consisting of lithium and hydrogen, x varies from 20 to 400 and y varies from 700 to 6000 and z varies from 0 to 100.There is also provided by the present invention an advantageous process for producing the above block copolymer.

Abstract: Diorganopolysiloxane homo- and copolymers having a viscosity from 2,000 to 200,000,000 centipoise at 25.degree. C., are produced by reacting a composition of (i) a silanol end-stopped perfluoroalkyl-substituted organopolysiloxane having 3 to 5 units, alone, or admixed with (ii) a second silanol end-stopped diorganopolysiloxane having 3 to 5 units, (i) being present in an amount of 20 to 100 mole % of the composition, in the presence of a non-bond-rearranging catalyst and removing the formed water of condensation.

Abstract: Diorganopolysiloxane oils having a viscosity from 50 to 100,000 centipoise at 25.degree.C., where at least one of the organo substituent groups on the silicon atoms is an aliphatic radical of three or more carbon atoms are produced by reacting a cyclic tetrasiloxane or a mixture of cyclic tetrasiloxanes at a temperature in the range of 0.degree. to 90.degree.C. and in the presence of 5 to 300 parts per million of a catalyst selected from cesium hydroxide, silanolates thereof, or a compound of the formula, ##EQU1## wherein R.sup.2 is alkyl of 1 to 8 carbon atoms, cycloalkyl of 4 to 8 carbon atoms and phenyl, B is nitrogen or phosphorous, R.sup. 3 is alkyl of 1 to 8 carbon atoms, cycloalkyl of 4 to 8 carbon atoms, phenyl, siloxane chains of the unit formula R.sub.a.sup.4 SiO.sub.4.sub.-a/2 and mixtures thereof, wherein R.sup.4 is monovalent hydrocarbon or halogenated monovalent hydrocarbon, and a is from 1.5 to 2.5.

Abstract: Diorganopolysiloxane copolymers having a viscosity from 100,000 to 200,000,000 centipoise at 25.degree.C., are produced by (a) forming an admixture of (i) a cyclic alkyl trifluoropropyl trisiloxane, (ii) a second cyclic diorgano trisiloxane, (i) being present in an amount of 40 to 85 mol % of the total of (i) and (ii), (iii) from 5 to 300 parts per million of an alkyl lithium catalyst, the alkyl component containing from 1 to 12 carbon atoms, and (iv) an aprotic solvent, said aprotic solvent being capable of dissolving both the trimers (i) and (ii) and the copolymer product, (b) reacting said admixture at a temperature between 0.degree.C. and 150.degree.C. to form the copolymer, and (c) recovering the copolymer from the reaction mixture.

Abstract: A process for producing diorganopolysiloxane gums having a viscosity from 1,000 to 100,000,000 centipoise at 25.degree.C, where at least one of the organo substituent groups on the silicon atoms is an aliphatic radical of more than three carbon atoms comprising reacting a cyclic tetrasiloxane or a mixture of cyclic tetrasiloxanes at a temperature in the range of 0.degree. to 90.degree. C and in the presence of 5 to 300 parts per million of a catalyst selected from the class consisting of cesium hydroxide and ##EQU1## where R.sup.2 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms and phenyl, B is selected from the class consisting of nitrogen and phosphorous, R.sup.3 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms, phenyl, siloxane chains of the unit formula R.sub.a.sup.4 SiO.sub.4.sub.-a/2 and mixtures thereof, where R.sup.