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: There is disclosed a diphenylsiloxane oligomer functionalized at both terminals, and methods for the preparation thereof, said oligomer having the following general formula G-(OSi(Ph).sub.2).sub.m O--G wherein Ph denotes a phenyl radical, m is 3 to 50 and G is has a formula independently selected from the group consisting of ##STR1## in which R.sup.1 is independently selected from the group consisting of hydrogen and a monovalent hydrocarbon group having 2 to 8 carbon atoms, said monovalent hydrocarbon group excluding phenyl, tolyl, xylyl, and ethylphenyl radicals, R is independently selected from the group consisting of R.sup.1, methyl radical and phenyl radical, Q is a divalent hydrocarbon group and n is an integer having a value of 1 to 3.

Abstract: There is disclosed a composition which can cure to provide a coating showing excellent release against tacky substances, particularly silicone pressure-sensitive adhesive, said composition comprising:(A) 100 parts by weight of an organopolysiloxane that contains at least one fluorinated organic group and at least two alkenyl groups in each molecule;(B) 0.3 to 40 parts by weight of an organohydrogenpolysiloxane that contains at least two silicon-bonded hydrogen atoms in each molecule;(C) 0.1 to 20 parts by weight of a fluorine-containing acrylic polymer;(D) a catalytic quantity of a hydrosilylation catalyst; and(E) a sufficient amount of an organic solvent to impart coatability to said composition.

Abstract: There is disclosed a process comprising(I) preparing a water-based dispersion of(A) a cured silicone powder having an average particle diameter of 0.1 to 200 micrometers and(B) an amorphous silica micropowder that has an average particle diameter not exceeding 1 micrometer and a surface silanol group density of at least 2 silanol groups per 100 square angstroms;(II) heating said water-based dispersion; and(III) removing the water from said dispersion, thereby producing a cured silicone rubber composition wherein the silica micropowder is immobilized on the surface of the cured silicone powder.

Abstract: An organopolysiloxane suitable for modifying curable organic and silicone compositions is disclosed, said organopolysiloxane having the general formula ##STR1## wherein each R.sup.1 is a monovalent group independently selected from the group consisting of hydrocarbon groups and halogenated hydrocarbon groups; R.sup.2 is selected from the group consisting of the hydrogen atom, monovalent hydrocarbon groups and halogenated hydrocarbon groups; R.sup.3 is selected from the group consisting of epoxy-functional organic groups, alkoxysilylalkyl groups and alkyl groups having at least 6 carbon atoms; a is zero or a positive number; b is a positive number; c is a positive number; a/c has a value of zero to <4; b/c has a value of 0.05 to 4; and (a+b)/c has a value of 0.2 to 4, with the proviso that neither R.sup.1 nor R.sup.2 is an alkenyl group and that said organopolysiloxane has in its molecule at least one said epoxy-functional organic group and at least one said alkyl group having at least 6 carbons.

Abstract: There is disclosed a method for preparing a diorganopolysiloxane having a functional group at only one end of the molecular chain and having the formulaR(R.sub.2 SiO).sub.p Bwherein R is an independently selected monovalent hydrocarbon group, B is selected from the group consisting of a hydrogen atom and an organosilyl group having the formula--SiR.sub.

Abstract: There is disclosed a polymer composition which can cure rapidly to provide a release coating that has a low surface tension, said composition comprising:(A) a fluorine-containing polymer that contains at least 2 alkenyl groups in each molecule, said polymer being obtained by the copolymerization of(a) an acrylic monomer having the general formulaCH.sub.2 .dbd.CX--COOR'wherein X is selected from the group consisting of hydrogen and a methyl radical and R' denotes a monovalent hydrocarbon group having 4 to 15 carbon atoms which contain at least one --CF.sub.2 -- group, and(b) a silicone macromonomer with the general formulaCH.sub.2 .dbd.CX--COO--Q--(RMeSiO).sub.n --Me.sub.

Abstract: An organic silicon alternating copolymer which resistant to chain scission by acid or alkali is disclosed, said copolymer comprising repeat units having the formula ##STR1## wherein R represents a monovalent hydrocarbon group having 1 to 10 carbon atoms and containing no aliphatic unsaturation, R.sup.1 represents a fluorine atom-containing monovalent organic group having 4 to 10 carbon atoms and containing at least two groups of the formula -CF.sub.2 -, R.sup.2 represents an alkylene group having 2 to 10 carbon atoms and said copolymer has a degree of polymerization of 1 to 10,000.

Abstract: There is disclosed an organopolysiloxane having bifunctional biphenyl groups of the formula I ##STR1## wherein Q is selected from the group consisting of a nitro group, a substituted amino group and an unsubstituted amino group, Z is an organopolysiloxane group represented by the formula II ##STR2## in which R.sup.1 is a divalent organic group having at least 2 carbon atoms, R.sup.2 through R.sup.6 are the same or different monovalent organic groups, n is an integer having a value of at least 1 and m is 0 or 1. The above organopolysiloxane may be reacted with an aromatic tetracarboxylic acid dianhydride and, optionally, with an aromatic diamine to obtain a polyamide acid, which may then be subjected to a thermal imidization step to provide a polyimide having repeating units shown by the formulas VI and VII ##STR3## wherein A.sup.1 is a tetravalent aromatic group, A.sup.3 is a divalent aromatic group and A.sup.

Abstract: An organopolysiloxane suitable for modifying curable organic and silicone compositions is disclosed, said organopolysiloxane having the general formula ##STR1## wherein each R.sup.1 is a monovalent group independently selected from the group consisting of hydrocarbon groups and halogenated hydrocarbon groups; R.sup.2 is selected from the group consisting of the hydrogen atom, monovalent hydrocarbon groups and halogenated hydrocarbon groups; R.sup.3 is selected from the group consisting of epoxy-functional organic groups, alkoxysilylalkyl groups and alkyl groups having at least 6 carbon atoms; a is zero or a positive number; b is a positive number; c is a positive number; a/c has a value of zero to <4; b/c has a value of 0.05 to 4; and (a+b)/c has a value of 0.2 to 4, with the proviso that neither R.sup.1 nor R.sup.2 is an alkenyl group and that said organopolysiloxane has in its molecule at least one said epoxy-functional organic group and at least one said alkyl group having at least 6 carbons.

Abstract: There is disclosed a novel organopolysiloxane-grafted polybenzobisoxazole and a method for preparing the functional organopolysiloxane-grafted polybenzobisoxazoles using a phthaloyl halide-functional organopolysiloxane.

Abstract: The present invention relates to an improved method for preparing a fluorinated silane having the formulaR.sup.1.sub.4 Si (I)or the formulaR.sup.2.sub.3 Si(R.sup.3 SiR.sup.4.sub.2).sub.z R.sup.3 SiR.sup.2.sub.3(II)said method comprising reacting the corresponding halide-functional or alkoxy-functional silane with lithium aluminum hydride or sodium borohydride to form a hydride-functional silane and then reacting the latter with a vinyl-terminated fluorotelomer or an allyl-terminated fluorotelomer, wherein at least three R.sub.1 of said silane (I), at least two of the R.sup.2 and at least one R.sup.4 of said silane (II) are selected from derivatives of fluorotelomers or fluorocotelomers, z has an average value of 0 to 4 and R.sup.3 is a derivative of an alkylene-terminated telechelic divalent telomer or cotelomer.

Abstract: Novel 1-aza-3-oxa-4-silacyclohex-1-ene compounds, and tautomers thereof, having utility as chemical modifiers or cross linkers for hydroxy-containing organic or inorganic substances are disclosed, said compounds being represented by the general formula (I) ##STR1## wherein R.sup.1 and R.sup.2 each independently denotes a monovalent organic group having 1 to 6 carbon atoms selected from the group consisting of saturated hydrocarbon groups and unsaturated hydrocarbon groups, R.sup.3 deontes an organic group having 1 to 30 carbon atoms selected from the group consisting of saturated hydrocarbon groups and unsaturated hydrocarbon groups, said R.sup.3 groups optionally containing a heteroatom selected from the group consisting of oxygen, nitrogen, sulfur, silicon, fluorine, chlorine, bromine and iodine, Me denotes a methyl radical and n is an integer having a value of 1 to 4.

Abstract: A curable composition suitable for treating substrates in order to render them oil repellent, water repellent and stain resistant, said composition comprising:(A) a fluorine-containing organosilicon compound having the general formula ##STR1## wherein R.sup.1 denotes a monovalent hydrocarbon group, excluding alkenyl groups, R.sup.2 denotes a divalent organic group, a is 2 or 3, and m is an integer having a value of 4 to 12, or a partial hydrolysis and condensation product thereof, and(B) a catalytic quantity of a condensation-reaction catalyst.

Abstract: A cotelomer of --CH.sub.2 CF.sub.2 -- (VDF) units and CF.sub.2 CF(CF.sub.3)-- (HFP) units characterized in that the HEP units comprise at least 33% of all VDF and HFP units in the cotelomer combined. Also claimed is a process for preparing a cotelomer in the liquid state comprising reacting (A) a bromine geminal telogen having the general formula RC(R')Br.sub.2 wherein R and R' are selected from the group consisting of F and perfluorinated alkyl radicals having 1 to 8 carbon atoms; (B) 1,1-difluoroethene, and (C) hexafluoropropene, the molar ratio of said components (A):(B):(C) being x:1:1 to x:1:5, in which x is 1 to 5.

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: There is disclosed a method for the preparation of an organosilicon polymer having the structure ##STR1## wherein each R.sup.1 is a monovalent hydrocarbon group, R.sup.2 is an alkylene group, R.sup.3 is selected from hydrogen, an alkenyl group or a hydroxyl group, m is zero or greater and n is 1 or more, said method comprising:reacting(A) diorganosiloxane having the general formula ##STR2## (B) an unsaturated aliphatic hydrocarbon having 3 to 10 carbon atoms that contains 2 carbon-carbon double bonds and an unsaturated aliphatic hydrocarbon having 2 to 10 carbon atoms that contains 1 carbon-carbon triple bond, said reaction taking place in the presence of(C) a hydrosilylation-reaction catalyst.

Abstract: A composition is disclosed, said composition comprising(A) a polydimethylsiloxane having a viscosity greater than about 2 cS at 25.degree. C.; and(B) a polyisobutylene oligomer having a number average molecular weight of about 200 to about 3,000 and having at least one end terminated with an epoxy-containing group, the weight ratio of said polydimethylsiloxane (A) to said polyisobutylene (B) being in the range 1:99 to 99:1.

Abstract: A silicone rubber composition having good processability and good molding properties is disclosed, said composition comprising:(A) an organopolysiloxane containing vinyl groups;(B) a fluorine resin powder;(C) an organopolysiloxane containing units having the formulaF(CF.sub.2).sub.a CH.sub.2 CH.sub.2 Si(Me).sub.n O.sub.3-n/2in which a is an integer of at least 4, n is 0, 1 or 2 and Me denotes a methyl radical;(D) a reinforcing silica powder having a surface area of at least 50 m.sup.2 /g; and(E) a sufficient quantity of a curing agent to cure said composition.

Abstract: An organopolysiloxane suitable for modifying curable organic and silicone compositions is disclosed, said organopolysiloxane having the general formula ##STR1## wherein each R.sup.1 is a monovalent group independently selected from the group consisting of alkyl radicals having 1 to 5 carbon atoms and phenyl radical; R.sup.2 is a monovalent group independently selected from the group consisting of hydrogen, alkyl radicals having 1 to 5 carbon atoms and phenyl radical; R.sup.3 is selected from the group consisting of alkoxysilylalkyl groups and alkyl groups having at least 6 carbon atoms; a is zero or a positive number; b is a positive number; c is a positive number; a/c has a value of zero to <4; b/c has a value of 0.05 to 4; and (a+b)/c has a value of 0.2 to 4, with the proviso that said organopolysiloxane has in its molecule at least one said alkoxysilylalkyl group and at least one said alkyl group having at least 6 carbons.