Abstract: A platinum catalyst which is prepared by reacting a platinum halide with an organic compound having at least one --C.tbd.C-- group in the presence or absence of a base to form a complex which promotes the addition of silicon-bonded hydrogen atoms to silicon-bonded aliphatic unsaturated hydrocarbon groups in the presence of no-clean flux.

Abstract: 3-(Vinylbenzyloxy)propylsilane compounds represented by the general formula, CH.sub.2 CH.PHI. CH.sub.2 OCH.sub. CH.sub.2 CH.sub.2 SiR.sup.1.sub.n (OR.sup.2).sub.3-n (wherein R.sup.1 and R.sup.2 each represent a hydrocarbon residue containing 1 to 4 carbon atoms, and n represents an integer from 0 to 2) are provided as novel styrene skeleton-containing alkoxysilane compounds which are highly useful as silane coupling agent or polymerizing monomer.

Abstract: A chiral catalyst is disclosed together with methods of using it for enantioselective syntheses. The chiral catalyst includes a nucleus with two metal atoms that has four bridging ligands oriented radially to the axis of the nucleus. Each of these ligands includes a two complexing atoms each complexed to one of the metal atoms. At least one of the bridging ligands includes a chiral center which is bonded to one of the complexing atoms. Preferably, all four of the bridging ligands include a chiral center bonded to one of the complexing atoms. The catalyst of the invention has been found to be useful in catalyzing carbenoid transformation reactions such as cyclopropanation.

Abstract: Disclosed are purified polyether silicone addition reaction products of a hydrogen siloxane and a polyoxyalkylene containing a terminal double bond, which in unpurified form contains one or both of unreacted polyoxyalkylene and internal rearrangement side reaction products thereof which generate unpleasant odors in the reaction product upon storage and upon contact with water, substantially free from said unreacted polyoxyalkylene and rearrangement products thereof so that the total quantity of ketones and aldehydes produced by a treatment of the purified polyether silicones in a closed system at 60.degree. C. for 24 hours with a quantity of 10 .sup.

Abstract: Process for preparing organosilicon compounds having silicon-bonded groups containing olefinic unsaturation by reaction of a silicon compound having SiH groups with a diene having at least 5 carbon atoms and in which the unsaturation is located at the terminal carbon atoms. The process is carried out in the presence of a catalyst which has been prepared by reacting (i) an inorganic solid having surface reactive groups, (ii) an organosilicom compound having a group reactive with the inorganic solid and a group containing nitrogen and/or sulphur and (iii) a platinum compound or complex PtLb in which L is a ligand.Products have reduced content of isomers resulting from migration of double bond to internal position.

Abstract: This invention discloses a novel organosilicon compound, which is soluble in silicone oils and strongly absorbs ultraviolet light, represented by the general formula:An organosilicon compound having a benzophenone skeleton represented by the general formula: ##STR1## where "n" is an integer in the range 0.about.100, R.sup.1 are similar or dissimilar saturated hydrocarbon groups with a number of carbon atoms in the range 1-30 or phenyl group, R.sup.2 is a monofunctional organic group represented by the formula --(CR.sup.3 .sub.2 CR.sup.3 (H) CR.sup.3 .sub.2)-- R.sup.4, R.sup.3 is hydrogen atom or a saturated monofunctional hydrocarbon group with 1-5 carbon atoms, and R.sup.4 is a group represented by the formula: ##STR2## wherein R.sup.5 is a hydrogen atom or hydroxyl group, R.sup.6 are hydrogen atoms, or similar or dissimilar monofunctional saturated or unsaturated hydrocarbon groups with 1-10 carbon atoms, "a" is an integer in the range 0-3, and "b" is an integer in the range 0-4.

Abstract: A process comprising the steps of:1) reacting a norbornene compound of the formula: ##STR1## where R is H or methyl, R.sup.1 is a direct bond or --C(.dbd.O)O-- and R.sup.2 is vinyl, ethynyl, allyl or propargyl, with a silicon hydride functional compound in the presence of hydrosilation catalyst at a temperature of at least 60 degrees; and2) recovering a product which consists essentially of the addition products of the silicon hydride functional compound to the R.sup.2 group of the norbornene compound and which is substantially free of addition products of the silicon hydride functional compound to the internal ring double bond of the norbornene compound.The products of this process can be used to produce norbornene functional prepolymers which are useful in cureable silicone formulations based on thiolene or hydrosilation cure chemistry.

Abstract: The present invention is a process for the preparation of hydrolyzable beta-cyanoalkylsilanes. More particularly, this invention relates to the catalytic addition of silicon hydrides to alpha,beta-unsaturated olefinic nitriles to form beta-cyanoalkylsilanes. The present invention employs a novel catalyst comprising a supported aminoorganosilane.

Abstract: The invention provides a process for producing epoxy-functional silicones by a rhodium metal complex-catalyzed hydrosilation reaction between an SiH-containing silane or siloxane and an olefin epoxide, in the presence of a tertiary amine stabilizer. In practicing the invention, RhCl.sub.3 [(CH.sub.3 (CH.sub.2).sub.3).sub.2 S].sub.3 or PtCl.sub.2 [(CH.sub.3 CH.sub.2).sub.2 S].sub.2 are suitable hydrosilation catalysts and methyldicocoamine, CH.sub.3 (C.sub.18 H.sub.37).sub.2 N, is a suitable stabilizer. The invention also provides for a composition including an SiH-functional silane or siloxane, and a tertiary amine, where the composition is not susceptible to gelation during a hydrosilation addition reaction. The invention further provides a method for stabilizing epoxysilicones both during and after the hydrosilation addition reaction used in their production.

Abstract: Organopolysiloxanes having two different functional groups selected from the group consisting of 3-glycidoxy-propyl, 2-(3',4'-epoxycyclohexyl)ethyl, 3-hydroxypropyl, 3-(2'-hydroxyethoxy)propyl, 3-acryloxypropyl, and 3-methacryloxypropyl groups are more compatible with organic resins and more effective for tailoring the organic resins. They are produced by hydrosilylation of organohydrogenpolysiloxanes with functional group-containing alkenes.

Abstract: Siloxane copolymers containing alkenyl groups are prepared by reacting an organic compound (1) containing at least two aliphatic double bonds of the general formulaR.sup.2 (CR.sup.3 .dbd.CH.sup.2).sub.xin which R.sup.2 is a divalent, trivalent or tetravalent hydrocarbon radical having from 1 to 25 carbon atoms per radical, R.sup.3 is a hydrogen atom or an alkyl radical having from 1 to 6 carbon atoms per radical and x is 2, 3 or 4, with an organopolysiloxane (2) having an average of more than one Si-bonded hydrogen atom per molecule, in the presence of a catalyst (3) which promotes the addition of Si-bonded hydrogen to an aliphatic double bond, in which the ratio between the aliphatic double bond in the organic compound (1) and the Si-bonded hydrogen in the organopolysiloxane (2) is such that the alkenyl containing siloxane copolymers thus obtained have an average of more than one alkenyl group per molecule of the formula --CR.sup.3 .dbd.CH.sup.2, in which R.sup.3 is the same as above.

Abstract: A novel silicone polymer which is obtained by addition polymerization of at least one organohydrogenpolysiloxane of the type shown belowR.sup.1.sub.a R.sup.2.sub.b H.sub.c SiO.sub.(4-a-b-c)/2 ( 1)R.sup.1.sub.j H.sub.k SiO.sub.(4-j-k)/2 ( 2)and a specific type of polyoxyalkylene and/or organopolysiloxane provided that at least one selected from the organohydrogenpolysiloxane of the general formula (1) and the polyoxyalkylene is present for the addition polymerization. The silicone polymer is capable of being swollen with silicone oils to give a uniform, pasty composition without use of any surface active agent. This composition is able to stably, uniformly disperse water therein. Thus, the silicone polymer has wide utility in the fields of cosmetics and medicines.

Abstract: Alpha-fluorinated olefins are hydrosilated using selected cobalt compounds as catalysts. The products are useful in coatings, and as chemical intermediates, elastomers, and caulks.

Abstract: Alkynyl substituted organopolysiloxanes having alkynyl radicals attached to silicon by carbon-silicon bonds can be used in combination with a hydride siloxane crosslinker and a Group 8-10 catalyst to make one part heat curable organopolysiloxane compositions.

Abstract: The present invention is a process for the preparation of omega-alkenylchlorosilanes. The process comprises reacting a mixture comprising an .alpha.,.OMEGA.-diene and an organohydrosilane in the presence of a supported platinum catalyst to form an .OMEGA.-alkenylchlorosilane, where the mole ratio of the .alpha.,.OMEGA.-diene to the organohydrosilane is within a range of about 6:1 to 50:1. A preferred process is run as a continuous process employing a fixed-bed of silica gel supported platinum catalyst and excess .alpha.,.OMEGA.-diene is recovered and recycled to the process.

Abstract: Fluorine-containing dimethylchlorosilanes are prepared by reacting an ethylene compound having a fluorine-containing organic group with dimethylchlorosilane in the presence of a rhodium complex, for instance RhCl(PPh.sub.3) (Ph: phenyl group), as a catalyst. The use of a rhodium complex as a catalyst enables preparation in high yield of the fluorine-containing dimethylchlorosilane, which has been heretofore obtainable only in low yields.

Abstract: The invention disclosed herein deals with acyloxy endblocked polyethers having improved hydrolytic stability. This invention also deals with polysiloxane-polyoxyalkylene copolymers having improved hydrolytic stability and, with compositions which include the polysiloxane-polyoxyalkylene copolymers in the presence of water, and to methods for use of the polysiloxane-polyoxyalkylene copolymers to prepare polyurethane foams.

Abstract: A process and a catalytic composition for carrying out a platinum catalyzed hydrosilylation reaction between an SiH-containing material and a terminal olefin. The process of the invention involves heating the reactants in the presence of a platinum catalyst and a promoter which is a hindered amine or phosphine, or acid salt thereof, the promoter containing at least 6 carbon atoms and having the formula ##STR1## Q is N or P; when Q is N, R is H, alkyl of 1-18 carbon atoms, nonterminal alkenyl of 4-18 carbon atoms, arylalkyl of 7-25 carbon atoms, or a derivative thereof; when Q is P, R is alkyl of 1-18 carbon atoms, nonterminal alkenyl of 4-18 carbon atoms, arylalkyl of 7-25 carbon atoms, or a derivative thereof; x is 0 or 1; R' is alkyl of 1-18 carbon atoms, nonterminal alkenyl of 4-18 carbon atoms, arylalkyl of 7-25 carbon atoms, or a derivative thereof; y is 0, 1, or 2; R" is a branched group having a 2.degree. or 3.degree.

Abstract: The use of an effective amount of a cyclodextrin has been found to enhance the rate of addition between a silicon hydride and an olefinically unsaturated material in the presence of a platinum catalyst.

Abstract: 3-chloropropylsilanes are prepared from hydrogensilanes and allyl chloride, where a stoichiometric excess of allyl chloride is maintained in the condensate of the vapor emitted by the boiling reactant mixture.

Abstract: A chiral catalyst is disclosed together with methods of using it for enantioselective syntheses. The chiral catalyst includes a nucleus with two metal atoms that has four bridging ligands oriented radially to the axis of the nucleus. Each of these ligands includes two complexing atoms each complexed to one of the metal atoms. At least one of the bridging ligands includes a chiral center which is bonded to one of the complexing atoms. Preferably, all four of the bridging ligands include a chiral center bonded to one of the complexing atoms. The catalyst of the invention has been found to be useful in catalyzing carbenoid transformation reactions such as cyclopropanation.

Abstract: Catalytic polymerization of dialkyl-, alkylaryl- or diaryldiethynylhydridosilanes cleanly affords soluble poly(silylene)vinylenes which can be shaped as fibers, films and bulk objects and thermally converted to silicon carbide.

Abstract: An improved process is provided for the preparation of siloxane-oxyalkylene block copolymer surfactant compositions which utilize a hydrosilylation reaction with a monocarboxylate ester of an alkanediol as the reaction solvent. The reaction solvent need not be removed from the block copolymer, particularly when the block copolymer is used as a surfactant for polyurethane foam formulations. 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is the preferred reaction solvent.

Abstract: The platinum catalyst composition comprises a diolefin component represented by the following general formulaCH.sub.2 .dbd.CH--R--CH.dbd.CH.sub.2wherein R is a divalent saturated hydrocarbon radical, and a platinum compound component. The platinum catalyst composition is extremely useful for hydrosilylation of an organosilicon compound having a .tbd.SiH radical with an olefin. When used for the hydrosilylation reaction, it inhibits effectively the isomerization of the starting material olefin, thereby enabling the intended organosilicon compound to be obtained in a high yield.

Abstract: Disclosed are purified polyether silicone addition reaction products of a hydrogen siloxane and a polyoxyalkylene containing a terminal double bond, which in unpurified form contains one or both of unreacted polyoxyalkylene and internal rearrangement side reaction products thereof which generate unpleasant odors in the reaction product upon storage and upon contact with water, substantially free from said unreacted polyoxyalkylene and rearrangement products thereof so that the total quantity of ketones and aldehydes produced by a treatment of the purified polyether silicones in a closed system at 60.degree. C. for 24 hours with a quantity of 10.sup.

Abstract: The present invention relates to a process for the preparation of compounds of the formula I ##STR1## in which R.sup.1 is hydrogen, halogen, alkyl, alkoxy andR.sup.2 is hydrogen, halogen, alkoxy or phenoxy, which may be substituted by halogen, alkyl, alkoxy or alkylthio, by reaction of a compound of the formula II ##STR2## with a compound of the formula II ##STR3## in which R.sup.1 and R.sup.2 have the meanings as in formula I, in the presence of catalytically active amounts of hexachloroplatinic acid, which comprises metering the starting compounds of the formulae II and III simultaneously into the reaction vessel at temperatures of 60.degree. C. to 150.degree. C. and allowing the reaction to go to completion.

Abstract: The present invention is a process for the preparation of hydrolyzable .beta.-cyanoalkylsilanes. More particularly, this invention relates to the catalytic addition of silicon hydrides to .alpha.,.beta.-unsaturated olefinic nitriles to form .beta.-cyanoalkylsilanes. The instant process employs a catalyst comprising a diamine and copper or a copper compound. The copper or copper compond may be retained on a solid support. The proces rate and yield of .beta.-cyanoalkylsilanes is increased by running the process in essentially an oxygen free environment.

Abstract: Cyclopentyl trichlorosilane can be efficiently prepared by the hydrosiliaton reaction of trichlorosilane and cyclopentene which can proceed only to a very low extent by the use of conventional platinum catalysts effective in other hydrosilation reactions. Thus, an equimolar mixture of the reactants is heated in the presence of a chlorine-deficient chloroplatinic acid catalyst of a specified chlorine:platinum atomic ratio at a temperature higher than the boiling point of the mixture under normal pressure in a pressurizable vessel so that the desired product can be obtained in a yield of 90% of the theoretical value or higher.

Abstract: Novel silanes having sterically hindered aminohydrocarbyl groups of the formula X.sub.3 SiRCR'.sub.2 NR".sub.2 and having utility as coupling agents and a process for their preparation are described.

Abstract: Novel organofunctional polydiorganosiloxanes containing amino and polyoxyalkylene groups, well adapted as surfactants, dispersants or additives to textile rinsing softening compositions, or to solid antifoams for washing powders, have the formula: ##STR1##

Abstract: This invention relates to polyfunctional silicone polymers containing one or more alkylene polyfunctional hydrolyzable silyl radicals extended from the siloxy polymer chain, said polymer having the structure ##STR1## wherein R.sub.2 and R.sub.3 are each independently alkyl or aryl optionally substituted with lower alkyl;R.sub.4 is hydrogen or R.sub.2 ;R.sub.7 is R.sub.2 or Z.sub.1 ;Z.sub.1 is --CH.sub.2 CHA--(CH.sub.2).sub.r Si(R.sub.1).sub.3 ;Z and Z.sub.2 are each independently --CH.sub.2 CHA--(CH.sub.2).sub.r Si(R.sub.1).sub.3 or (R.sub.9).sub.n Si(H).sub.3-n ;R.sub.9 is alkyl, alkoxy, phenoxy or aryl optionally substituted with lower alkyl;n has a value of from 0 to 3;x has a value of from 2 to 1000;y has a value of from 1 to 200;p' has a value of from 0 to about 50% of y;A is hydrogen, alkyl or phenyl;r has a value of from 0 to 12; andR.sub.1 is hydroxy, acyloxy, halogen, amino, alkoxy, aryloxy or aryloxy substituted with lower alkyl, halogen or acyloxy.

Abstract: Novel diorganopolysiloxanes containing benzalmalonate functional groups, well adapted as coatings for optical fibers, as well as lubricants for plastic substrates, e.g., PVC substrates, have one of the following formulae: ##STR1## in which A and/or B is a benzalmalonate radical.

Abstract: A polyorganosiloxane compound is provided which has a fluorine-containing group at its .alpha.-position and one or more than one hydrosilyl group at its .omega.-position, has a fluorine-containing group located at least at its .alpha.- and .alpha.'-position and one or more than one hydrosilyl group at its .omega.-position or has a fluorine-containing group at least at its .alpha.-, .alpha.'- and .alpha."-position and one or more than one hydrosilyl group at its .omega.-position.

Abstract: In a process for the preparation of molded polyurethane or polyurea articles, especially by the RIM process, internal release agents of the general formula ##STR1## are used. In this formula R.sup.1 =is alkyl with 20 to 40 carbon atoms,R.sup.2 =is R.sup.1 or methyl,R.sup.3 =is --(CH.sub.2).sub.s -- or --[(CH.sub.2).sub.t --].sub.r (OC.sub.2 H.sub.4).sub.x --(OC.sub.3 H.sub.6).sub.y --whereins=3 to 12,t=3 to 12,r=0 or 1,x=0 to 10,y=0 to 10,and the sum of x+y is not less than 1,n=0 to 50,m=2 to 100, m being greater than n,p=0 to 5,with the proviso that the siloxane has a melting point of not less than 38.degree. C.The compounds are finely dispersed with an average particle size of not less than 5 to 100.mu. in amounts of 0.5 to 5 weight percent, based on the reaction formulation. The release agents are preferably suspended in a portion of the polyol or polyolamine that is to be foamed.

Abstract: A process for directly producing a high purity vinylalkoxysilane by gradually feeding an alkoxysilane containing low levels of ionic chloride or alkyl amine into a reaction zone containing an alkyne and a platinum hydrosilation catalyst.

Abstract: Linear and cyclic diorganopolysiloxanes containing dibenzoylmethane functional groups are well suited for the coating of optical fibers and for lubricating plastics, e.g., PVC.

Abstract: The invention provides a diorganopolysiloxane having a hydroxy- and amino-functional reactive group bonded only to one of the terminal silicon atoms of the linear molecular chain ends. The diorganopolysiloxane compound, which is useful as a modifying agent of various kinds of synthetic resins, is represented by the general formulaR.sub.3 Si--O--SiR.sub.2 --O.sub.n SiR.sub.2 --CH.sub.2 CH.sub.2 CH.sub.2 OCH.sub.2 CHOHCH.sub.2 NR.sup.1 R.sup.2,in which R is a monovalent hydrocarbon group, R.sup.1 and R.sup.2 are each a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of alkyl groups having 1 to 18 carbon atoms and aryl groups having 6 to 15 carbon atoms, at least one of R.sup.1 and R.sup.2 being not a hydrogen atom, or R.sup.1 and R.sup.2 are each a divalent group jointly forming a morpholino group together with the nitgoren atom and the subscript n is zero or a positive integer not exceeding 1000.

Abstract: Organosilicon prepolymer compositions which are the reaction products of (a) at least one of cyclic polysiloxanes or tetrahedral siloxysilanes containing at least two .tbd.SiH groups and (b) polycyclic polyenes having at least two non-aromatic, non-conjugated carbon-carbon double bonds in their rings, wherein the total ratio of the non-aromatic, non-conjugated carbon-carbon double bonds in the rings of (b) to .tbd.SiH groups in (a) in greater than 1.8:1 and either the .tbd.SiH containing compounds (a) or the polycyclic polyenes (b) have more than two reactive sites. The organosilicon compositions are blended with (c) at least one of additional cyclic polysiloxanes, additional tetrahedral siloxysilanes or linear, short chain .tbd.SiH terminated polysiloxanes to make fluid hydrosilation compositions. These storable blends are polymerized to thermally stable thermoset polymers.

Abstract: A polyorganosiloxane compound which has a fluorine-containing group at its one terminal and an aminopropyl group at its other terminal.The polyorganosiloxane compound can provide various improved properties as well as new properties to synthetic resins by a chemical connection to the synthetic resins with a functional group or groups reactive with the amino group at the other terminal thereof.

Abstract: A rhodium colloid has been found to be a superior catalyst for the hydrosilylation of silicon hydride having two or three hydrogens attached to silicon. The rhodium colloid is made by effecting reaction between rhodium trichloride and certain silicon hydride.

Abstract: A polyorganosiloxane compound contains a fluorine-containing substituent at least at its .alpha.-, .alpha.'- or .alpha."-position and a substituent having an epoxy linkage at its .omega.-position. The polyorganosiloxane compound can provide a synthetic resin with properties which cannot be provided by conventional polysiloxane compound by incorporating the polyorganosiloxane compound into the synthetic resin through a chemical linkage via the epoxy linkage thereof and a group reactive with the epoxy linkage thereof.

Abstract: A process for forming polysilanes from silicon hydrides by contacting the silicon hydride with catalytic amounts of selected scandium, yttrium and rare earth metal hydrides, and a process for hydrosilation of alpha-olefins in which an alpha-olefin is contacted with a silicon hydride in the presence of catalytic amounts of selected scandium, yttrium and rare earth metal compounds.

Abstract: A method of producing alkoxysilethylene endblocked polydiorganosiloxane consists essentially of first reacting hydroxyl endblocked polydiorganosiloxane with an excess of a SiH compound having from 2 to 4 SiH groups in the presence of a platinum catalyst, then reacting that product with vinyltrialkoxysilane to give the desired polymer.

Abstract: A novel organopolysiloxane compound is disclosed which is capable of being cured by crosslinking and exhibiting a liquid-crystalline phase even in a crosslinked condition. The organopolysiloxane has mesogenic groups bonded to the silicon atoms such as --CH.sub.2).sub.3 O--Pn--CO--O--Pn--CN; --CH.sub.2).sub.3 O--CH.sub.2).sub.3 O--Pn--CO--O--Pn--CN; --CH.sub.2).sub.3 O--Pn--CO--O--Pn--F; and --CH.sub.2).sub.3 O--Pn--CO--O--Pn--O--CH.sub.3, in which the symbol Pn denotes a 1,4-phenylene group, and hydrolyzable groups pertaining to the crosslinking reaction.

Abstract: 3-Benzylidenecamphor-substituted diorganopolysiloxanes, well adopted for incorporation into coating and lubricant compositions (notably as a lubricant for PVC), have the structural formulae (1) and (2) ##STR1## wherein A and/or B is a 3-benzylidenecamphor moiety.

Abstract: A process for the neutralization, clarification and decolorization of organosilanes or organosilicones derived from the reaction of an organosilane or a hydropolysiloxane with an aliphatically unsaturated compound in the presence of an acidic platinum catalyst, a process for the conversion of a soluble platinum catalyst into an insoluble form and a process for the recovery of a platinum catalyst from an insoluble anion exchange resin which comprises:(a) contacting a reaction mixture of the organosilane or organosilicone with a basic anionic exchange resin having a free amino or quaternized ammonium salt functionality in an insoluble polymeric matrix under conditions suitable to bind the soluble platinum catalyst to said resin;(b) separating said resin containing bound platinum catalyst from the organosilane or organosilicone reaction mixture and, optionally,(c) treating the separated resin with an inorganic base to convert the bound platinum catalyst to a recoverable salt or(d) subjecting the resin containing

Abstract: The present invention provides a method for preparing alkenylsilanes whereby a gaseous mixture consisting essentially of an acetylenic hydrocarbon and a silane containing a silicon-bonded hydrogen atom is directed into contact with a reaction medium in the form of a relatively thin moving liquid layer or film. The reaction medium comprises a solubilized hydrosilylation catalyst and the alkenylsilane produced as a product of the reaction. The reaction medium can optionally include an organic liquid that is a solvent for the catalyst, alkenylsilane and acetylenic hydrocarbon reactant.

Abstract: Secondary-amino-functional organosilicone are prepared by the reaction of an N-substituted, secondary allylamine with an Si-H functionalized organosilicone particularly a di- or polysiloxane. The resulting products are useful in toughening thermosetting matrix resins, particularly epoxy resins.

Abstract: Compounds of the formula ##STR1## in which Ar is substituted or unsubstituted phenyl, pyridinyl, furanyl, naphthyl, thienyl, or thiazolyl; R is a (C.sub.1-4) alkyl; W is oxygen or methylene; and Ph is substituted or unsubstituted phenoxyphenyl, benzylphenyl, phenyliminophenyl, benzodioxolyl, or benzoylphenyl, exhibit pyrethroid-like insecticidal activity with low toxicity to aquatic fauna.

Abstract: A curable composition comprising an unsaturated polyether having terminal alkenyl groups, a linear or branched siloxane-substituted polyether having terminal polyorganosiloxane residues and at least two Si-H groups in the molecule and a catalyst having platinum as the main component has an excellent deep portion curing property and provides a cured body having a good hydrophilic property and a good dimensional reproducibility. This curable composition is especially valuable as a dental impression material.