Abstract: The present invention relates to a fluid comprising a compatible blend of (A) a polydimethylsiloxane and (B) a polybutylene wherein the viscosities of these two components are substantially identical such that the viscosity of the blend is less than the viscosity of either component (A) or (B), each viscosity being measured at the same operating temperature and pressure. This synergistic viscosity reduction is enhanced when particular moieties are present in the polydimethylsiloxane and/or polybutylene components and as the polydispersity of the polydimethylsiloxane is increased.

Abstract: A polyimide resin having excellent storage stability which cures to give a highly adherent, highly heat-resistant, and highly moisture-resistant film is disclosed, said resin being prepared by reacting(A) a tetracarboxylic dianhydride and(B) a diamino-functional siloxane compound having the general formula ##STR1## in which each R.sup.1 is independently selected from C.sub.1 to C.sub.20 monovalent hydrocarbon radicals, each R.sup.2 is independently selected from C.sub.1 to C.sub.20 divalent hydrocarbon radicals, R.sup.3 is selected from the group consisting of hydrogen and --SiR.sup.1.sub.3 wherein R.sup.1 is defined as above, a is an integer from 1 to 20, b is an integer from 1 to 20, c is an integer from 0 to 20, and d is an integer from 1 to 20.

Abstract: There is disclosed an organosilicon compound which contains a silicon-bonded functional group at each molecular chain terminal as well as a terminal -SiH group on a side chain branching from the main chain, said functional group being selected from amino-functional organic groups, epoxy-functional organic groups, hydroxyl group or a group obtained by substituting active hydrogen in the preceding groups with triorganosilyl group.

Abstract: A method for preparing a thermoplastic resin composition, said method comprising hot-kneading, in the absence of a radical-generating catalyst,(A) 100 parts by weight of a thermoplastic resin; and(B) 0.1 to 200 parts by weight of an alkenyl-functional polyorganosiloxane filled with amorphous silica micropowder, wherein the weight ratio of said silica micropowder to said alkenyl-functional polyorganosiloxane is 0.01:100 to 50:100, whereby the polyorganosiloxane of component (B) is chemically bonded to resin (A).

Abstract: A lubricant composition is disclosed which provides good antiwear characteristics in air at .gtoreq.100.degree. C. and exhibits a low friction coefficient, said composition comprising:(A) a fluorosilicone oil;(B) at least one compound selected from the group consisting of ferrocene, 1,1'-bis(diphenylphosphino) ferrocene and an N,N-disalicylidene-diaminoalkane in which the alkane portion has 3-6 carbon atoms; and(C) at least one phosphorous compound selected from the group consisting of triphenylphosphine, tri-o-tolylphosphine, 1,5-bis-diphenylphosphinopentane and a dialkyldithiophosphate salt in which the alkyl groups have 1-14 carbon atoms, wherein said components (B) and said component (C) is each present at a level of 0.01 to 0.3 percent based on the total weight of said composition.

Abstract: There is disclosed a liquid composition which does not readily phase separate, has a low surface tension, and exhibits excellent lubricating properties, said composition comprising(A) 100 parts by weight of a hydrocarbon oil that is liquid at ordinary temperature; and(B) 0.01 to 500 parts by weight of an organosilicon polymer that is liquid at ordinary temperatures, said polymer having the general formula ##STR1## wherein R.sup.1 denotes an non-alkenyl monovalent hydrocarbon radical, R.sup.2 is a radical selected from the group consisting of monovalent hydrocarbon radicals, hydrogen and hydroxyl, R.sup.3 is an alkylene radical, m is an integer with a value of at least 2, n is an integer with a value of zero or greater and m.gtoreq.n.

Abstract: There is disclosed a method for synthesizing polyolefins having a silyl group at one terminus, said method comprising reacting(A) a monomer selected from the group consisting of ethylene and a combination of ethylene and an .alpha.-olefin; and(B) a silane having the formulaR.sup.2 R.sup.3 R.sup.4 SiHwherein R.sup.2, R.sup.3 and R.sup.4 each represents a monovalent group selected from the group consisting of hydrogen, alkyl having 1 to 4 carbon atoms, aryl, alkylaryl, arylalkyl, alkoxy having 1-4 carbon atoms, phenoxy, fluorinated alkyl having 3 to 6 carbon atoms, a dialkylamino group in which the alkyl groups contain 1 to 4 carbon atoms and a diorganopolysiloxane chain containing 1 to 10 siloxane units, said reaction taking place in the presence of(C) a catalyst comprising a metallocene compound.

Abstract: A highly efficient method for preparing a diphenylsiloxane-dimethylsiloxane copolymer having a narrow molecular weight distribution, said method comprising:(I) polymerizing(A) a mixture of hexamethylcyclotrisiloxane and hexaphenylcyclotrisiloxane, using as polymerization initiator(B) a lithium compound having the formula ##STR1## in which R independently denotes a monovalent hydrocarbon radical, X and X' are selected from the group consisting of hydrogen and lithium, with the proviso that one of X and X' must be lithium, and m is an integer having a value of at least 1, optionally, in the presence of(C) a molecular-weight regulator selected from the group consisting of water and a compound having the formula ##STR2## in which R has its previously defined meaning and p is an integer having a value of at least 1, said polymerization taking place in the presence of both(D) a nitrile compound and(E) an active hydrogen-free polar solvent; and(II) terminating the polymerization reaction product from step (I) with a

Abstract: A highly efficient method for preparing an organopolysiloxane which contains little low molecular weight organosiloxane is disclosed, said method comprising:(I) polymerizing(A) cyclic trisiloxane having the formula ##STR1## wherein R is a monovalent hydrocarbon radical, excluding aryl radical, using as a polymerization initiator(B) a lithium compound having the formula ##STR2## in which R' is independently selected from monovalent hydrocarbon radicals, X and X' are selected from the group consisting of hydrogen and lithium, with the proviso that one of X and X' must be lithium, and m is an integer having a value of at least 1, optionally, in the presence of(C) a molecular-weight regulator selected from the group consisting of water and a compound having the formula ##STR3## in which R' has its previously defined meaning and p is an integer having a value of at least 1,said polymerization taking place in the presence of both(D) a nitrile compound and(E) an active hydrogen-free polar solvent; and(II) terminatin

Abstract: A method for preparing a telechelic polydiene having at least 70% 1,4-microstructure and at least 70% of its end groups capped by silanol-terminated siloxane functionality is disclosed, said method comprising:(I) reacting, in a non-polar solvent solution,(A) at least one diene monomer,(B) a dianionic initiator which is soluble in said non-polar solvent and, optionally,(C) a polymerization adjuvant to form a dianionically active polydiene;(II) reacting said dianionically active polydiene from step (I) with(D) a cyclic siloxane, in the presence of(E) a promoter selected from the group consisting of an organic sulfoxide, a tertiary amide and mixtures thereof to cap both ends of said dianionically active polydiene; and(III) quenching the capped product from step (II).

Abstract: There is disclosed an improved method for preparing a hybrid organodisilanol compound having the formulaHO--R.sup.1 R.sup.2 SiC.sub.n H.sub.2n RC.sub.n H.sub.2n SiR.sup.1 R.sup.2 --OH (I)said method comprising:(A) reacting a dihydridosilane of the formulaR.sup.1 R.sup.2 SiH.sub.2 (II)with a diene of the formulaC.sub.n H.sub.2n-1 RC.sub.n H.sub.2n-1 (III)to provide a dihydrido compound of the formulaH--R.sup.1 R.sup.2 SiC.sub.n H.sub.2n RC.sub.n H.sub.2n SiR.sup.1 R.sup.2 --H (IV); and(B) reacting said dihydrido compound (IV) with a buffered water solution in the presence of a palladium catalyst.

Abstract: There is disclosed a curable organopolysiloxane composition suitable for forming an adherent coating on metals which is durable under acidic conditions, said composition comprising:(A) an organopolysiloxane that contains at least 2 alkenyl groups in each molecule;(B) an organopolysiloxane that contains at least 2 silicon-bonded hydrogen atoms in each molecule;(C) a novel adhesion promoter; and(D) a hydrosilylation catalyst,wherein the adhesion promoter is prepared by reacting(a) an amine compound with the general formulaR.sub.n NH.sub.(3-n)in which R denotes a monovalent hydrocarbon group and n is 1 or 2, and(b) an aliphatically unsaturated epoxy compound, and, optionally, condensing the above reaction product with(c) a silicon compound that contains at least two silicon-bonded alkoxy groups in each molecule.

Abstract: Methods are disclosed for the blending of inherently incompatible polymer systems to provide compositions comprising (i) 1 to 99.99 percent by weight of a diorganopolysiloxane; and (ii) 0.01 to 99 percent by weight of an organopolysiloxane-grafted rigid linear aromatic polymer selected from the group consisting of organopolysiloxane-grafted polyimide and organopolysiloxane-grafted polybenzobisoxazole.

Abstract: A method for preparing a telechelic polydiene having at least 70% 1,4-microstructure and at least 70% of its end groups capped by reactive silyl functionality is disclosed, said method comprising:(I) reacting, in a non-polar solvent solution,(A) at least one diene monomer,(B) a dianionic initiator which is soluble in said non-polar solvent and, optionally,(C) a polymerization adjuvant to form a dianionically active polydiene; and(II) capping both ends of said dianionically active polydiene from step (I) with(D) a silane, said capping being carried out in the presence of(E) a promoter selected from the group consisting of a tertiary amine and a crown ether based on 12-crown-4.

Abstract: There is disclosed a diphenylsiloxane oligomer functionalized at both terminals and methods for the preparation thereof, said oligomer having the following general formulaG-(OSiPh.sub.2).sub.m O-G (i)wherein Ph denotes a phenyl radical, m is 3 to 50 and G has a formula independently selected from the group consisting of ##STR1## in which R, R.sup.4 and R.sup.5 are independently selected from the group consisting of methyl, phenyl and R.sup.1, R.sup.1 is selected from the group consisting of hydrogen and a monovalent hydrocarbon group having 2 to 8 carbon atoms excluding phenyl, tolyl, xylyl, and ethylphenyl radicals, Q is a divalent hydrocarbon group and k is independently 0 to 3 at each terminus of said oligomer with the proviso that k is >0 at one terminus of said oligomer, at least one substituent among R, R.sup.4 and R.sup.5 in formula (ii) is R.sup.1 and, when both R.sup.4 and R.sup.5 groups at one terminus of said oligomer are phenyl, groups R.sup.4 and R.sup.

Abstract: There is disclosed a curable resin composition that has an excellent fluidity prior to curing and that cures to form a molding resin that is flexible, highly moisture resistant, and strongly resistant to heat shock, said composition comprising(A) 100 weight parts of a curable resin; and(B) 0.1 to 500 weight parts of an epoxy group-containing silicone resin that has the general formula(R.sup.1 SiO.sub.3/2).sub.a (R.sup.2 R.sup.3 SiO.sub.2/2).sub.b (SiO.sub.4/2).sub.cwherein R.sup.1, R.sup.2 and R.sup.3 each represents a group selected from the group consisting of an epoxy group-containing organic group and a monovalent hydrocarbon group with the proviso that said epoxy group-containing organic groups comprise 0.1 to 40 mole percent of the total silicon-bonded organic groups in said silicone resin (B), a is a positive number, b is zero or a positive number, c is zero or a positive number, b/a has a value of zero to 10, c/(a+b+c) has a value of zero to 0.

Abstract: The present invention relates to a peroxide-curable silicone rubber composition which, when cured, exhibits a reduced modulus and improved tear strength relative to prior art systems without sacrificing other desirable properties, such as high tensile strength of the cured rubber or storage stability of the uncured rubber base, said composition comprising:(A) 100 parts by weight of a diorganopolysiloxane gum;(B) 10 to 75 parts by weight a reinforcing filler;(C) a polybutylene oligomer having a number average molecular weight of 200 to less than 900 and having functionality selected from the group consisting of epoxy, alkoxyphenylene, hydroxyl, carboxyl, anhydride and fully saturated; and, optionally,(D) a hydroxy-terminated diorganopolysiloxane having a degree of polymerization of 2 to 50.

Abstract: There is disclosed a method for treating and protecting a substrate, said method comprising coating the surface of said substrate with a composition comprising a blend of(A) a polydimethylsiloxane polymer having a viscosity at 25.degree. C. of 5 to 100,000 cS; and(B) a polyisobutylene oligomer having a number average molecular weight of 200 to 550. The treatment imparts an aesthetically pleasing appearance to the surfaces of plastic, rubber or leather substrates whereby surface gloss is enhanced, but not excessively, as is the case for a comparable all-silicone treating agent.

Abstract: A free-flowing silicone polymer powder, having an average particle size of 1 to 1000 microns and prepared by mixing a polydiorganosiloxane with a silica filler, is uniformly dispersed in an organic resin using conventional equipment, such as a single screw or, preferably, a twin screw extruder. When employed at a concentration of about 0.5 to 25 parts by weight of powder per 100 parts by weight of resin, a significant improvement in the burn character of the modified resin is obtained such that the rate of heat release, generation of smoke and evolution of toxic carbon monoxide gas is significantly reduced relative to the unmodified resin.

Abstract: A siloxane powder composition which can impart improved lubricity character to a thermoplastic resin is disclosed, said composition being prepared by mixing(A) 100 parts by weight of a liquid polydiorganosiloxane and(B) 40 to 200 parts by weight of a silica powder that has a specific surface of at least 50 m.sup.2 /g using sufficient shear to prepare a powder in which the surface of component (B) is coated with component (A), and then mixing this powder with(C) 10 to 50 parts by weight of a polyorganosiloxane resin which is a solid at room temperature, said resin consisting essentially of (R.sub.3 SiO.sub.1/2) siloxane units and (SiO.sub.2) siloxane units in the molar ratio of 1:4 to 1:1,where R is selected from the group consisting of alkyl radicals and phenyl radical.