Abstract: Mercaptan substituted silicon compounds are produced by the reaction of amine with carboxyl. UV curable silicon compositions are produced from such compounds.

Abstract: Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include hydrogen-functional and vinyl-functional photoreactive terpolymers, which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.

Abstract: There are provided curable compositions, comprising (a) an organopolysiloxane base polymer, (b) an organohydrogenpolysiloxane crosslinking agent, (c) an effective amount of precious metal containing catalyst, and (d) and azo compound wherein at least one --N.dbd.N-- moiety is not part of a cyclic structure, and preferably is alpha to an electron withdrawing group such as carbonyl, in an amount effective to inhibit reaction of said organopolysiloxane base polymer and said organohydrogenpolysiloxane crosslinking agent. Articles of manufacture as well as methods for preparation of such compositions and articles 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: Epoxy- and/or acrylic-functional polysiloxanes are disclosed which, when combined with onium salt photoinitiating catalysts or free-radical photoinitiating catalysts or both, form ultraviolet radiation-curable release coating compositions which render surfaces non-adherent to other surfaces which would normally adhere thereto. The compositions will cure to such an adhesive state upon brief exposure to ultraviolet radiation. Cure and substrate adhesion may be enhanced by the addition of epoxy monomers where onium salt photocatalysts are included. Preparation of the polymers, coating compositions, catalysts and catalyst blends are also disclosed.

Abstract: Photo-curable vinyloxy-functional organosiloxane polymers are provided. Also provided are release coating compositions made by combining said polymers with various photo-initiators. The polymers have a unique vinyloxy functionality; and the release coating compositions cure with brief exposure to ultraviolet radiation to form premium abhesive coatings. Process for preparing the vinyloxy-functional polysiloxanes and the release coating are also disclosed.

Abstract: Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include mercaptoalkoxyalkyl-functional polysiloxanes and vinyl-functional photoreactive terpolymers, both of which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.

Abstract: There is provided a method for making curable compositions containing silicon-bonded hydrogen atoms and silicon-bonded olefinic radicals, the improvement comprising adding at least one free radical type photoinitiator and at least one precious metal or precious metal-containing hydrosilation catalyst so that crosslinking is effected by two separate mechanisms. The curable compositions and articles made therefrom are also provided.

Abstract: There is provided a method for making curable compositions containing silicon-bonded hydrogen atoms and silicon-bonded acrylate radicals, the improvement comprising adding at least one free radical type initiator and at least one precious metal or precious metal-containing hydrosilation catalyst so that crosslinking can be effected by two different mechanisms. Curable compositions and articles made therefrom are also provided.

Abstract: Epoxy- and/or acrylic-functional polysiloxanes are disclosed which, when combined with onium salt photoinitiating catalysts or free-radical photoinitiating catalysts, or both, form ultraviolet radiation-curable release coating compositions which render surfaces non-adherent to other surfaces which would normally adhere thereto. The compositions will cure to such an adhesive state upon brief exposure to ultraviolet radiation. Cure and substrate adhesion may be enhanced by the addition of epoxy monomers where onium salt photocatalysts are included. Preparation of the polymers, coating compositions, catalysts and catalyst blends are also disclosed.

Abstract: Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include mercaptoalkoxyalkyl-functional polysiloxanes and vinyl-functional photoreactive terpolymers, both of which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.

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: Ultraviolet radiation-curable epoxyfunctional silicone controlled release compositions are provided. Polyfunctional epoxy monomers, when added to UV-curable epoxy silicones provide quantitative variable release, depending on the amount of epoxy monomer added.

Abstract: There are provided condensation curable silicone release compositions comprised of a silanol functional base polymer, a crosslinker containing silanic hydrogen, a precious metal catalyst such as platinum or rhodium, an optional carboxylic ester inhibitor and silicone vinyl gum cure accelerators effective for allowing thermal cure at relatively lower temperatures while minimizing the necessity of excess metal catalyst.

Abstract: A solventless release coating composition is provided as well as a method for rendering materials nonadherent to other materials which would normally adhere thereto. The coating composition is a precious metal catalyzed silicone composition comprising a vinyl functional polysiloxane base polymer and a methylhydrogen cross-linking agent. A blend of diallylmaleate and vinyl acetate is added to the composition in order to extend the useful pot-life of the product by inhibiting premature cross-linking.

Abstract: The present invention provides a method for preparing a precious metal catalyzed, heat curable silicon release coating composition. Also, there is provided an article of manufacture for packaging the ingredients necessary to practice the method of the invention.

Abstract: Epoxy functional diorganosiloxane fluids are combined with bis-aryl iodonium salts, particularly linear alkylate bis-dodecylphenyl iodonium salts to form a silicone coating composition effective for rendering surfaces non-adherent to other surfaces which would normally adhere thereto, and which will cure to a final non-adherent state upon brief exposure to ultraviolet radiation. Adhesion of the silicone coating to a substrate can be improved with the addition of .beta.-(3,4-epoxycyclohexyl)ethyltrimethoxy silane.

Abstract: An ultraviolet light curable silicone pressure sensitive adhesive is provided which is comprised of an epoxy functional silicone polymer and a combination of standard MQ silicone resins or epoxy functional MQ silicone resins, which can be cured to an adhesive composition in the presence of certain bis(aryl)halonium salt catalysts.

Abstract: There are provided addition-curable silicone release compositions comprised of a vinyl or silanol functional polymer base, a crosslinker containing silanic hydrogen, a precious metal catalyst such as platinum or rhodium, an optional carboxylic ester inhgibitor and silicone vinyl gum cure accelerations effective for allowing thermal cure at relatively lower temperatures while minimizing the necessity of excess metal catalyst.

Abstract: The present invention provides a method for preparing a precious metal catalyzed, heat curable silicon release coating composition. Also, there is provided an article of manufacture for packaging the ingredients necessary to practice the method of the invention.