Abstract: There is provided a crystalline silicone-imide block copolymer comprising at least one imide-disiloxane block, wherein the imide portion of said imide-disiloxane block has a symmetrical aromatic radical as its nucleus, and at least one polydiorganosiloxane has at least about five siloxy units.

Abstract: The instant invention provides a method for making acrylate-functional halosilanes or halosiloxanes comprising reacting an organic acrylate and a halosilane or halosiloxane having at least one silicon-bonded hydrogen atom in the presence of a hydrosilation catalyst and an amount of inhibitor effective for inhibiting the thermal free radical polymerization of said organic acrylate. Acrylate-functional halosilanes and halosiloxanes prepared in accordance with the present method are also provided.

Abstract: Acrylated silicone polymers are prepared by reacting limoneneoxide-functional silicones with acrylic acid or a substituted acrylic acid in the presence of a catalyst selected from tetraalkylurea (e.g. tetramethylurea), tetraalkylguanidine (e.g. tetramethylguanide) or mixtures thereof. Adhesion of the resulting ultraviolet light curable compositions to various substrates, especially super calendared kraft papers, can be improved with the addition of N-vinylpyrrolidinone.

Abstract: A composition for coating, which comprises:(1) 100 parts by weight of film forming components comprising:(A) 10 to 90% by weight of an organosilane triol of the following formula and/or its partial condensate:R.sup.1 Si(OH).sub.3wherein R.sup.1 represents a monovalent group selected from the group consisting of alkyl groups having 1 to 3 carbon atoms and aryl groups, and(B) 90 to 10% by weight of colloidal silica; and(2) 5 to 40 parts by weight of a copolymer of:(C) a compound represented by the formula: ##STR1## wherein Q represents >C.dbd.O or the following formula: ##STR2## wherein each X may be either the same or different and each represents hydrogen atom or hydroxyl group, of which at least one is hydroxyl group, and R.sup.2 represents an alkyl group having 1 to 18 carbon atoms, and(D) an epoxy group-containing trialkoxysilane.

Abstract: There is provided a room temperature vulcanizable silicone composition comprising a polyalkoxy-terminated polydiorganosiloxane and a difunctional nitrogen-containing silane. Processes for making such room temperature vulcanizable compositions are also provided.

Abstract: A method for making a novel copolymer, which comprises: reacting(A) a compound represented by the formula: ##STR1## wherein Q represents >C.dbd.O or the following formula: ##STR2## wherein each X may be either the same or different and each represents hydrogen atom or hydroxyl group, of which at least one is hydroxyl group, and R.sup.1 represents an alkyl group having 1 to 18 carbon atoms, with(B) an epoxy group-containing trialkoxysilane and/or an epoxy group-containing dialkoxysilane in the presence of(C) an aluminum chelate compound represented by the formula:Al(OR.sup.2).sub.n L.sub.3-nwherein R.sup.2 represents an alkyl group having 1 to 4 carbon atoms, L represents the following formula: ##STR3## where R.sup.3 represents an alkyl group having 1 or 2 carbon atoms, R.sup.4 represents an alkyl group or an alkoxy group each having 1 or 2 carbon atoms,and n is an integer of 0, 1 or 2.

Abstract: The present invention provides an electroconductive silicone elastomer composition comprising:(A) 100 parts by weight of a polydiorganosiloxane having an average degree of polymerization of 500 to 12,000, wherein each polymer molecule contains at least two vinyl groups bonded to silicon atoms;(B) 100 to 500 parts by weight of nickel-coated carbon;(C) 0.1 to 5 parts by weight of a polyorganohydrogensiloxane, and(D) 0.2 to 300 ppm based on the total amount of (A), (B) and (C) of platinum metal or platinum compound as platinum atom.

Abstract: A process for the continuous polymerization of polydiorganosiloxanes comprising:(a) mixing one or more cyclopolysiloxane monomers with one or more chainstopping agents,(b) preheating the mixture resulting from (a),(c) adding to the preheated mixture of (b) an amount of catalyst effective for catalyzing a polymerization reaction,(d) polymerizing the catalyzed mixture of (c) in a screw extruder having essentially plug flow therethrough, and(e) adding to the resulting polymer an amount of neutralizing agent effective for neutralizing said catalyst.

Abstract: The present invention provides a room temperature curable polyorganosiloxane composition comprising:(A) 100 parts by weight in total of:(1) a polydiorganosiloxane of the general formula: ##STR1## (2) a silane of the general formula:R.sub.b.sup.3 Si(OR.sup.4).sub.4-b(B) 0.01 to 10 parts by weight of a curing catalyst;(C) 0.5 to 10 parts by weight of a nitrogen-containing silicon compound in which the nitrogen atom is bonded with a silicon atom through one or more carbon atoms and said nitrogen atom is further bonded directly with said silicon atom or another silicon atom; and(D) 0.05 to 50 parts by weight of a polyoxyalkylene chain-containing compound.

Abstract: A stable, one-package, silicone RTV composition convertible to a tack-free elastomer comprising:(1) a polydiorganosiloxane base polymer,(2) an effective amount of condensation catalyst,(3) a stabilizing amount of a silicon-nitrogen compound for scavenging hydroxy radicals which releases ammonia as a by-product of the scavenging reaction, and(4) an effective amount of scavenger for said ammonia by-product selected from the group consisting of molecular sieves, acids and mixtures thereof.

Abstract: There is provided a curable composition comprising:(A) an organopolysiloxane block copolymer comprising:(i) at least one siloxane block consisting essentially of from about 6 to about 120 units of the formula R.sub.2 SiO,(ii) at least one siloxane block consisting essentially of from about 3 to about 160 units of the formula R.sup.1 SiO.sub.1.5,(iii) optionally, at least one siloxane block consisting essentially of from 1 to about 80 units of the formula R.sup.2 SiO.sub.1.5, and(iv) at least one siloxane block consisting essentially of from about 0.1 to about 10 mole percent of the sum of (i), (ii) and (iii) of units of the formula RR.sup.3 SiO,where R is a C.sub.1-5 substituted or unsubstituted alkyl radical or a C.sub.6-10 substituted or unsubstituted aryl or alkaryl radical, R.sup.1 is a C.sub.6-10 substituted or unsubstituted aryl or alkaryl radical, R.sup.2 is a C.sub.1-5 substituted or unsubstituted alkyl radical and R.sup.3 is a C.sub.

Abstract: A dirt resistant silicone coating composition comprising:(1) a base vinyl chainstopped polysiloxane,(2) a resinous organopolysiloxane copolymer,(3) a platinum catalyst and,(4) a liquid organohydrogenpolysiloxane crosslinking agent.

Abstract: A process for preparing polymethylsilsesquioxane comprising hydrolyzing and condensing methyltrialkoxysilane or its partially hydrolyzed condensate in an aqueous solution of ammonia or an amine.

Abstract: Stable, substantially acid-free, one package moisture curable organopolysiloxane compositions are provided having a condensation catalyst such as a tin compound and novel scavenger or scavenger/crosslinker compositions. A method for making the aforesaid moisture curable organopolysiloxane composition is also provided.

Abstract: An article comprising a backing, a silicone pressure sensitive adhesive, and optionally, a silicone release coating is provided for effecting removal of vertically cohesive inks from cellulosic materials. There is also provided the process of making and using the article.

Abstract: An article comprising a backing, a silicone pressure sensitive adhesive, and optionally, a silicone release coating is provided for effecting removal of vertically cohesive inks from cellulosic materials. There is also provided the process of making and using the article.

Abstract: A process for preventing odor in a polyoxyalkylene group-containing polyorganosiloxane comprising adding phytic acid to the polyoxyalkylene group-containing polyorganosiloxane during and/or after its production.

Abstract: There is provided a composition which vulcanizes at room temperature on exposure to moisture comprising a product resulting from mixing:(A) an organopolysiloxane consisting essentially of repeating R.sub.2 SiO units, where R is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical;(B) an effective amount of condensation catalyst, and(C) an effective amount of self-bonding agent of the general formula ##STR1## where R.sup.1 is a C.sub.(1-7) monovalent hydrocarbon radical, R.sup.2 is a C.sub.(1-4) alkyl radical, C.sub.(1-4) acyl radical or a radical of the formula --CH.sub.2 CH.sub.2 O).sub.n R.sup.4, where n is 1 or 2 and R.sup.4 is a C.sub.(1-4) alkyl radical, R.sup.3 is a C.sub.(1-18) divalent hydrocarbon radical free of aliphatic unsaturation attached to a nitrogen atom of the urea nucleus through a non-aromatic carbon atom, Z is hydrogen or a C.sub.(1-4) alkyl radical and y equals 0 or 1.

Abstract: A silicone emulsion composition containing a reinforcing amount of alumina sol blended in an emulsion precursor obtained by emulsifying a polydiorganosiloxane having at least one silanol group per molecule, one nonionic surfactant and the remainder water.

Abstract: A curable silicone coating composition which is resistant to dirt pickup, comprising:(1) a vinyl chainstopped polysiloxane having a viscosity up to 2,000,000 centipoise;(2) 1 to 2 parts of a resinous organopolysiloxane copolymer per part of (1);(3) a platinum catalyst and,(4) an organohydrogenpolysiloxane crosslinking agent.