Abstract: The invention provides a novel class of organosilicon compounds useful as a curing agent in a room temperature curable organopolysiloxane composition, which is represented by the general structural formulaR.sub.2 CH--CR.dbd.C(OR)--O--Si(R.sup.1).sub.3-m (O--CR.dbd.CH--R).sub.m,in which each R is a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group independently from the others, R.sup.1, if any, is a substituted or unsubstituted monovalent hydrocarbon group and the suffix m is 2 or 3. The compound can readily be synthesized by the reaction of an .alpha.,.beta.-unsaturated ester compound represented by the general formulaR.sub.2 C.dbd.CR--CO--OR,and an alkenyloxy-containing silane compound represented by the general formulaHSi(R.sup.1).sub.3-m (O--CR.dbd.CH--R).sub.m,in which R.sup.1, R and m each have the meaning as defined above, in the presence of a rhodium compound as a catalyst.

Abstract: The invention provides a novel cyclic organopolysiloxane compound represented by the general formula ##STR1## in which the groups denoted by R, R.sup.1 and R.sup.2 are each typically a monovalent hydrocarbon group having 1 to 8 carbon atoms, m is zero, 1, 2 or 3 and n is 2, 3 or 4 with the proviso that m+n is typically 4. A method for the preparation of the compound is disclosed. The inventive compound is useful as a crosslinking agent of a diorganopolysiloxane terminated at both molecular chain ends each with a silanolic hydroxy group so as to give a room temperature-curable silicone rubber composition free from the problem of emission of toxic or corrosive gases as a byproduct of the crosslinking reaction.

Abstract: The invention provides a novel and improved room temperature curable organopolysiloxane composition which is very stable over a long period of time if stored under an anhydrous condition but readily curable on exposure to moisture-containing atmosphere without producing no condensation products having toxicity, unpleasant odor or corrosiveness. The composition comprises, as the main component, an organopolysiloxane having at least three alkenyloxy groups bonded to the silicon atom or atoms in the organopolysiloxane molecule through a silhydrocarbylene linkage, e.g. silethylene linkage, and a curing accelerator.

Abstract: The present invention provides a novel room temperature-curable composition based on a polyoxyalkylene polyether, e.g. polyoxypropylene, admixed with a curing agent which is very stable when kept in a dry atmosphere or in a hermetically sealed condition but is readily cured when exposed to atmospheric air containing moisture into a rubber-like elastomer. The polyoxyalkylene polyether is terminated at both molecular chain ends with organosilyl groups having alkenyloxy groups bonded to the silicon atoms and can be prepared by the addition reaction of an allyl-terminated polyoxyalkylene polyether with an organosilane or organopolysiloxane compound having at least one silicon-bonded hydrogen atom and at least one silicon-bonded alkenyloxy group in a molecule in the presence of a platinum catalyst.

Abstract: The invention provides a novel class or organosilane compounds having a methacryloxy group and one or more of alkenyloxy groups bonded to the silicon atom as represented by the general formula ##STR1## in which R.sup.1 is a monovalent hydrocarbon group having from 1 to 8 carbon atoms, R.sup.2, R.sup.3 and R.sup.4 are each a hydrogen atom or a monovalent hydrocarbon group having from 1 to 8 carbon atoms, m is an integer of 3, 4 or 5 and n is a number of zero, 1 or 2. The organosilane compound, e.g. 3-methacryloxypropyl-containing alkenyloxysilanes can be readily prepared by the addition reaction of allyl methacrylate and a corresponding alkenyloxysilane having a hydrogen atom directly bonded to the silicon atom in the presence of a platinum catalyst. The organosilane compounds are useful as a coupling agent to increase adhesive bonding strength between inorganic and organic materials.

Abstract: A novel room temperature-curable composition is provided by the invention, of which the base polymer is a polyoxyalkylene polyether terminated at both chain ends with silanolic hydroxy groups. The composition comprises 100 parts by weight of the above silanol-terminated polyoxyalkylene polyether and 1 to 30 parts by weight of an organosilane or organopolysiloxane having, in a molecule, at least two hydrolyzable groups bonded to the silicon atoms which serves as a crosslinking agent. The composition can be stored for a long period of time when kept with exclusion of atmospheric moisture and, when exposed to the atmosphere, is rapidly cured into a rubbery elastomer having good mechanical properties. Tack-free drying of the composition is accelerated when an alkenyloxy-containing silane is used as the above-mentioned silane having hydrolyzable groups in combination with a guanidyl-containing organosilicon compound.

Abstract: The invention provides a novel class of organosilicon compounds which are hydrogenalkenyloxysilanes represented by the general formula ##STR1## in which R.sup.1 is a monovalent hydrocarbon group having from 1 to 8 carbon atoms, R.sup.2, R.sup.3 and R.sup.4 are each a hydrogen atom or a monovalent hydrocarbon group having from 1 to 8 carbon atoms and n is a number of zero, 1 or 2. The silane compounds are readily obtained by the dehydrochlorination reaction between a corresponding hydrogen-containing chlorosilane compound and an .alpha., .beta.-unsaturated aldehyde compound or a ketone compound in the presence of an acid acceptor. The compounds are useful as a modifying agent in the silicone technology and also serve as a curing agent.

Abstract: The invention provides a novel class of organosilane compounds having a glycidyloxy group and one or more of alkenyloxy groups bonded to the silicon atom as represented by the general formula ##STR1## in which R.sup.1 is a monovalent hydrocarbon group having from 1 to 8 carbon atoms, R.sup.2, R.sup.3 and R.sup.4 are each a hydrogen atom or a monovalent hydrocarbon group having from 1 to 8 carbon atoms, m is an integer of 3, 4 or 5 and n is a number of zero, 1 or 2. The organosilane compound, e.g. 3-glycidyloxypropyl-containing alkenyloxysilanes can be readily prepared by the addition reaction of glycidyl allyl ether and a corresponding alkenyloxysilane having a hydrogen atom directly bonded to the silicon atom in the presence of a platinum catalyst. The organosilane compounds are useful as a coupling agent to increase adhesive bonding strength between inorganic and organic materials.