Abstract: Shelf life of noble metal catalyzed addition crosslinkable organosilicon compositions is remarkably increased by treatment of a noble metal catalyst having an oxidation state greater than 0 with a bidentate chelate compound. The latter may remain in the catalyst mixture or be removed, and the treatment may be performed in situ or ex situ with respect to the remainder of the crosslinkable composition components.

Abstract: Crosslinkable silicone compositions with improved electrical properties are prepared by crosslinking an at least three component composition crosslinkable by hydrosilylation, each component containing siloxy units with 1 or 2 3,3,3-trifluoropropyl substituents.

Abstract: Silicone elastomers exhibiting non-transitory biofilm inhibiting properties are prepared from crosslinkable components which include an organopolysiloxane bearing at least one silicon-bonded hydrogen and/or at least one alkenyl group, and at least one carboxylic acid, carboxylic acid ester, or carboxylic acid anhydride group, which becomes covalently bonded to the polymer before or during curing.

Abstract: A primer composition for silicone rubbers, in particular for addition-crosslinking silicone rubbers, comprises a tetraalkoxysilane and/or partial hydrolysate thereof, a metal salt, alkoxide, or chelate and/or partial hydrolysate thereof, a silicone resin, and from 50-95% by weight of solvent. The primer provides excellent adhesion between silicone rubber and numerous substrates.

Abstract: A primer composition for silicone rubbers, in particular for addition-crosslinking silicone rubbers, comprises a tetraalkoxysilane and/or partial hydrolysate thereof, a metal salt, alkoxide, or chelate and/or partial hydrolysate thereof, a silicone resin, and from 50-95% by weight of solvent. The primer provides excellent adhesion between silicone rubber and numerous substrates.

Abstract: The invention relates to organosilicon compounds with at least three silicon atoms, consisting of units of the formula (I) RaSi(NR1C═ONR22)k(NR3C═ONR4)t/2YmOn/2[(CR52)s]r/2, where Y represents units of the formula (II) —SiR63-p-q(NR1C═ONR22)p(NR3C═ONR4)q/2, where R, R1, R2, R3, R4, R5 and R6 independently of each other can be either identical or different and represent a hydrogen atom or possibly substituted monovalent hydrocarbon radicals with between 1 and 20 carbon atoms; and where a, k, t, n, m, r, s, p and q have the meaning assigned to them in claim 1, under the provision that the sum of p+q is ≦3, the sum of a+k+l+m+n+r equals 4, the sum of m+r equals 0 or 1, and the organosilicon compound of the invention contains at least one unit of formula (I) where t is not equal to 0.

Abstract: The invention relates to organopolysiloxane compounds which can be stored subject to the exclusion of moisture, can be cross-linked by cleaving of alcohols to form elastomers when moisture gains access at room temperature and are based on (A) polydiorganosiloxanes with organyloxy groups, optionally (B) organyloxy functional cross-linkers with at least three organyloxy groups, and optionally (C) condensation catalysts, characterised in that they contain at least one (D) compound selected from the compounds (D.sub.a) to (D.sub.f) given in claim 1.

Abstract: A process for preparing aqueous emulsions from high-molecular-weight organopolysiloxanes which are solid at room temperature, in the absence of organic solvents, which comprises dissolving the high-molecular-weight organopolysiloxane which is solid at room temperature in a low-molecular-weight organo(poly)siloxane which is liquid at room temperature, and emulsifying this solution with water in the presence of an emulsifier and other additives, if desired.

Abstract: The present invention relates to gypsum powders containing a hydrophobic agent and to water-repellent articles which are prepared from gypsum containing powered hydrophobic agents, in which the hydropohobic agents are prepared by spray-drying a mixture containing at least water, an organopolysiloxane having Si-bonded hydrogen and a water-soluble, film-forming polymer having a turbidity point of from 35.degree. to 98.degree. C.