Abstract: A process for producing a silicone sealant, which is stable in the absence of moisture, cures when exposed to moisture, has an elongation at break of greater than 800 percent, and has adhesion to concrete. The silicon sealant is produced by first mixing an alkoxysilethylene endblocked polymer, a dialkyldialkoxysilane, and a titanium catalyst, then mixing in precipitated calcium carbonate filler having a fatty acid surface treatment.

Abstract: A moisture curing silicone sealant which adheres to a variety of substrates is produced by a method which first mixes a trialkoxysilethylene endblocked polydiorganosiloxane, a trialkoxysilane crosslinker, and a beta-dicarbonyl titanium catalyst, then adds a precipitated calcium carbonate filler having a fatty acid treated surface.

Abstract: A room temperature curing composition which cures fast and has good reversion resistance and good package stability is a mixture of 66.75 to 89.4 weight percent of a hydroxyl endblocked polydiorganosiloxane; 5.5 to 10 weight percent of a tetrafunctional ethoxy-ketoximo silane mixture having 6 to 27 weight perent tetraketoximosilane, 9 to 39 weight percent of monoethoxytriketoximosilane, 38 to 60 weight percent of diethoxydiketoximosilane, and 5.5 to 25 weight percent triethoxymonoketoximosilane; 0.1 to 0.25 weight percent of a tin catalyst, 0 to 3 weight percent of an adhesion promoter, and 5 to 20 weight percent of reinforcing silica. These compositions cure to elastomeric materials useful as caulking materials, adhesives, coatings and encapsulating materials for construction and automotive industries.

Abstract: A chelated titanium catalyst can be improved by the addition of an additive selected from the group consisting of organomercaptan of the formula RSH, where R is a hydrocarbon radical containing from 3 to 12 carbon atoms, and mercapto containing silane of the formula HSR'SiX.sub.3, where R' is a divalent hydrocarbon having from 1 to 8 carbon atoms and X is alkoxy radical having 1 to 6 carbon atoms. The improved composition has a reduced tendency to develop color upon storage. The improved composition is particularly useful in a silicone composition comprising a hydroxyl endblocked polydiorganosiloxane and an alkoxysilane or mixture of alkoxysilanes, or in a silicone composition comprising an alkoxy endblocked polydiorganosiloxane.

Abstract: A faster curing neutral curing composition is obtained by the additive of an oxime compound to a composition comprising a trialkoxysilethylene endblocked polydiorganosiloxane, alkoxysilane crosslinker, and titanium catalyst.

Abstract: A chelated titanium catalyst can be improved by the addition of an additive selected from the group consisting of organomercaptan of the formula RSH, where R is a hydrocarbon radical containing from 3 to 12 carbon atoms, and mercapto containing silane of the formula HSR'SiX.sub.3, where R' is a divalent hydrocarbon having from 1 to 8 carbon atoms and X is alkoxy radical having 1 to 6 carbon atoms. The improved composition has a reduced tendency to develop color upon storage. The improved composition is particularly useful in a silicone composition comprising a hydroxyl endblocked polydiorganosiloxane and an alkoxysilane or mixture of alkoxysilanes, or in a silicone composition comprising an alkoxy endblocked polydiorganosiloxane.

Abstract: A silicone sealant which is stable in the absence of moisture and cures upon exposure to moisture to give an elastomer with a controllable modulus is produced by mixing a polydiorganosiloxane having both vinyl and alkoxysilethylene endblocking, alkoxy silane crosslinker, titanium catalyst, and optional filler. The modulus is controlled by varying the ratio of vinyl to alkoxysilethylene endblocking present on the polymer.

Abstract: A process for producing a silicone sealant which is stable in the absence of moisture and having a slump of less than 1 inch mixes a polydiorganosiloxane polymer having hydroxyl or alkoxysilethylene endblocking, an alkoxysilane crosslinker, and a titanium catalyst; then adds a reinforcing filler.

Abstract: Protective coating solutions for cementitious substrates are disclosed which comprise a minor amount of a cyclohexane based organic solvent on a major amount of an asphaltic material. The asphaltic material is a blend of asphalt with the reaction product of asphalt, a vinyl aromatic monomer, a rubber and an unpolymerized acrylamide.