Abstract: The present invention relates to a process for preparing organyloxysilyl-terminated polymers which have increased stability toward atmospheric moisture, by reacting hydroxy-terminated organic polymers with isocyanato-functional silanes in the presence of at least one catalyst selected from the group consisting of bismuth and zinc compounds, and to crosslinkable compositions comprising such polymers.

Abstract: The invention relates to moisture-crosslinkable organopolysiloxane-polyurea block copolymers, to a process for preparing the crosslinkable organopolysiloxane-polyurea block copolymers, and to their use; to crosslinkable compositions comprising the crosslinkable organopolysiloxane-polyurea block copolymers, to the preparation of the crosslinkable compositions, to their vulcanization, and to the use of the vulcanizates.

Abstract: Crosslinkable compositions employing organosilicon compounds having at least two hydrolyzable groups, optionally a crosslinker, and optionally a compound containing basic nitrogen, include a crosslinking catalyst which is a reaction product of a phosphorus compound, a sulfur compound, and a tin compound. The compositions exhibit improved shelf life.

Abstract: Organopolysiloxane compositions obtainable by reaction of (a) essentially linear organopolysiloxanes which are terminated at both ends by Si-bonded hydroxy groups, (b) optionally, plasticizers, (c) at least one dialkylaminomethylalkyldialkoxysilane chain extender and/or partial hydrolysate thereof, (d) at least one deactivator, (e) optionally, one or more alkyltrialkoxysilanes and/or partial hydrolysates thereof, and (f) optionally, catalysts for accelerating the reaction of silane (e) with Si—OH groups, are useful in low-modulus compositions which can be crosslinked at room temperature, in particular, compositions which crosslink with elimination of alcohols.

Abstract: The invention relates to compounds on the basis of organosilic compounds, which can be crosslinked at room temperature, so-called RTV-1 compounds, and which are characterized by containing as the catalyst at least one organozinc compound (C) that contains moieties of the general formula (I): RaR1b(XR3)cSnX(4-a-b-c)/2, and compounds (D) that contain basic nitrogen, wherein R1 is the same or different and represents —OS(═O)2R2, and R, X, R2, R3, a, b and c are defined as in claim 1, with the proviso that the organozinc compound comprises at least one R1 group. The invention further relates to a method for producing the inventive compounds.

Abstract: Storage stability of one-component elastomers prepared from constituents having alkoxysilyl end groups is enhanced by employing bin compounds having a coordination number of 5 or 6 in which tin is coordinately bonded to a P═O group as at least one condensation catalyst.

Abstract: Organopolysiloxane compositions which are stable on storage in the absence of moisture and can be crosslinked at room temperature on admission of moisture are based on organosilicon compounds containing at least two hydrolyzable groups, and contain, as catalyst, at least one titanium compound of the formula Ti(OR)4-n[(OR1)x—OR2]n  (I) where R may be identical or different and are monovalent, substituted or unsubstituted hydrocarbon radicals, R1 may be identical or different and are divalent, substituted or unsubstituted hydrocarbon radicals, R2 may be identical or different and are as defined for R, n is 1, 2, 3 or 4 and x is an integer greater than or equal to 1.

Abstract: Stable RTV-1-alkoxy compositions contain a tin catalyst and surfactants (S) which contain divalent polyether units of the general formula (I) —O—[(CR&agr;R&bgr;)u—O]v—  (I) in which R&agr; and R&bgr; are hydrogen or a monovalent C1-C10-hydrocarbon radical optionally substituted by hydroxyl, fluorine, chlorine, bromine, C1-C10-alkoxyalkyl or cyano groups, u is from 1 to 6 and v is from 3 to 100. The compositions are stable despite the presence of the tin catalyst and alkoxy-functional organosilicon compounds.