Abstract: A suspension containing crosslinked silicone particles with a lower mean particle diameter and a better dispersion in certain organic resins is prepared by emulsifying a condensation crosslinkable silicone composition containing (A) an organopolysiloxane having at least two silanol groups per molecule and (B) a crosslinker, but no (C) condensation catalyst, in water using a surfactant. A tin (II) salt of an organic acid with no more than ten carbon atoms is then emulsified in water with a surfactant, and added as the component (C) to the emulsion of condensation crosslinkable silicone composition. This crosslinks the emulsion of condensation crosslinkable silicone composition.

Abstract: A method for producing organopolysiloxane comprising (A) polymerizing or increasing the viscosity of straight-chain or cyclic organo(poly)siloxane using an acid-active solid catalyst, (B) adding at least one zeolite solid adsorbent, and (C) thereafter filtering off the adsorbent.

Abstract: The present invention relates to surface-modified insulators obtained by coating an insulator body with a preparation containing at least one organofluorine-functional silane and/or siloxane, at least one mineral acid and at least one metal salt of aluminum(III), tin(II), tin(IV), iron(III) or titanium(III) as catalyst, to a process for their preparation and to the use of the preparation for coating insulators.

Abstract: Antireflective compositions characterized by the presence of an SiO-containing polymer having pendant chromophore moieties are useful antireflective coating/hardmask compositions in lithographic processes. These compositions provide outstanding optical, mechanical and etch selectivity properties while being applicable using spin-on application techniques. The compositions are especially useful in lithographic processes used to configure underlying material layers on a substrate, especially metal or semiconductor layers.

Abstract: This invention relates to a process of producing a siloxane copolymer comprising the step of reacting at least one diol, at least one dicarbonate and at least one silicon compound as copolymerization components in the presence of an esterification or transesterification catalyst, wherein the silicon compound is represented by the general formulas (I) and (II): wherein R1, R2, R3 and R4 are each independently a hydrogen atom or a substituted or non-substituted organic group; X and Y are each independently a hydrogen atom or a substituted or non-substituted organic group; a represents an integer of 0 to 5,000; and b represents an integer of 3 to 20.

Abstract: An organoxy-terminated organopolysiloxane of the general formula (A): wherein R is a monovalent hydrocarbon group, R1 is a monovalent hydrocarbon group of 1-18 carbon atoms, and R2 is an organic group of 1-18 carbon atoms, and “a” is an integer of 0, 1 or 2, is prepared by reacting an organopolysiloxane of the formula: HO(R2SiO)nH having a viscosity of 10-100,000 centistokes at 25° C. with an organoxysilane of the formula: (R2O)4-a—Si—(R1)a or a partial hydrolyzate thereof in the presence of a tetraalkoxytitanium.

Abstract: A condensation curable coating composition comprises the following and any reaction product thereof: (A) a room temperature vulcanizable polyorganosiloxane composition; and (B) a marine foul release-enhancing proportion of at least one organic compatible silicone fluid free from silanol groups and being capable of blooming to the surface of a cured product of component A.

Abstract: The present invention relates to photocurable siloxane polymers having functional acryl groups, useful in the preparation of intraocular lenses (IOLs). The polymers are siloxane copolymers, wherein the siloxane can be selected from the group consisting of diphenyl siloxane, phenylalkyl siloxane, dialkyl siloxane, and trifluoroalkyl alkyl siloxane. The invention also relates to methods for producing the said siloxane polymers, as well as to producing accommodating lenses in vivo, which means that the tens is formed in the capsular bag of the eye.

Abstract: Oligomers of the formula: [R3SiO1/2]m[O1/2Si(R2)O1/2]n[SiO3/2R]o[SiO4/2]p  (I) wherein each R is selected individually from the group consisting of B, R1, —OR2, R3 and R4; B is an organosilyl functional group bridged to the Si atom of the siloxane oligomer backbone by an Si—C bond; each R1 is independently a saturated aliphatic hydrocarbon group of 1 to 16 carbon atoms; each R2 is independently a group as defined for R1, an aromatic hydrocarbon group or an acyl group; each R3 is independently a monovalent organic radical containing an aliphatically unsaturated hydrocarbon group and each R4 is a monovalent organic radical linked to the Si atom of the siloxane oligomer backbone by an Si—C bond, which does not include an aliphatically unsaturated hydrocarbon group and which has thereon one or more members of the group selected from aromatic hydrocarbon, ether, ester, carbamate, thioether, polysulfide, blocked mercaptan, amide, epoxy, cyano an

Abstract: A condensation reaction curable silsesquioxane resin composition and methods for its preparation and cure are disclosed. By modifying the silsesquioxane resin with a silyl-terminated hydrocarbon, such as a silphenylene, the resulting silsesquioxane resin has improved strength and toughness without significant loss of modulus.

Abstract: A composition comprising at least one organofluorine-functional silane and/or siloxane, at least one mineral acid and at least one metal salt of aluminum(III), tin(II), tin(IV), iron(III) or titanium(III); a process for preparing said composition and to its use; and surface-modified substrates obtainable by coating with said composition.

Abstract: A solution comprising a composition and a volatile silicone solvent overcomes the environmental disadvantages associated with volatile organic compounds. The invention particularly provides for a primer composition for bonding silicone elastomers to metals that is free of volatile organic compounds comprises an epoxy alkoxy silane, a titanium ortho alcoholate or ortho ester, a silicon ortho alcoholate or ortho ester and a volatile silicone compound.

Abstract: The present invention provides fora silicone epoxy resin, its preparation, and the use in corrosion-inhibiting, heat-stable coatings.

Abstract: Compositions having improved stability which, when applied to a variety of substrates and cured, form transparent abrasion resistant coatings having improved adhesion, and improved resistance to crack formation. The coating compositions are aqueous-organic solvent mixtures containing a mixture of hydrolysis products and partial condensates of an epoxy functional silane and a disilane and a carboxylic acid component. Substrates containing the coating compositions and a process for applying the coating composite to a substrate are also disclosed.

Abstract: A room temperature curable organopolysiloxane composition comprising (1) a hydroxyl end-blocked organopolysiloxane having a viscosity of 10-1,000,000 centistokes at 25° C. in admixture with a premix of (2) methyltriacetoxysilane or a partial hydrolyzate thereof as a curing agent and (3) methanol is improved in shelf stability, physical properties and outer appearance as well as adhesion to aluminum.

Abstract: The present invention provides a curable composition comprising a reactive silicon group-containing saturated hydrocarbon polymer which features a high curing rate and a high degree of adhesiveness to various adherends. This invention is relates to a curable composition which comprises (A) a saturated hydrocarbon polymer having at least one silicon-containing group containing a hydroxyl or hydrolyzable group bound to the silicon atom and capable of forming a siloxane bond, (B) a tetravalent tin compound, and (C) a silicon compound of the general formula (1) R1aSi(OR2)4-a   (1) wherein R1 and R2 each independently represents a substituted or unsubstituted hydrocarbon group containing 1 to 20 carbon atoms; a represents any of 0, 1, 2 and 3.

Abstract: A solvent free silicone composition for forming a cured release coating comprising (A) 100 parts by weight of a diorganpolysiloxane having in each molecule at least two alkenyl groups and a visocisity of 50 to 5,000 mPa-s at 25 ° C.; (B) 3 to 50 parts by wight of an organohydrogenpolysilozane mixture comprising constituent (b-1) and consitiuent (b-2) in a weight ratio of 1:0.01 to 1:1, where (b-1) is a diorganopolysilozane having a visocsity of 1 to 1,000 mP-s at 25 ° and having both molecular terminals capped with silicon-bonded hydrogen atoms and (b-2) is an organhydrogenpolysilozane having a visocity of 1 to 1,000 mPa-s at 25 ° C. and having at least three pendant silicon-bonded hyhdrogen atoms in each molecular chain; and (C) a catalyic amount of a platinum-type catalyst.

Abstract: Oligomers of the formula: [R3SiO½]m[O½Si(R2)O½]n[SiO{fraction (3/2)}R]o[SiO{fraction (4/2)}]p  (I) wherein each R is selected individually from the group consisting of B, R1,—OR2, R3 and R4; B is an organosilyl functional group bridged to the Si atom of the siloxane oligomer backbone by an Si—C bond; each R1 is independently a saturated or aromatic hydrocarbon group of 1 to 16 carbon atoms; each R2 is independently a group as defined for R1 or an acyl group; and each R3 is independently a monovalent organic radical containing an aliphatically unsaturated hydrocarbon group and each R4 is a monovalent organic radical linked to the Si atom of the siloxane oligomer backbone by an Si—C bond, which does not include an aliphatically unsaturated hydrocarbon group and which has thereon one or more members of the group selected from ether, polyether, ester, polyester, carbamate, polyurethane, isocyanurate, thioether, polysulfide

Abstract: Novel hindered alkoxy siloxane compounds and compositions containing hindered alkoxy siloxane compounds are provided. The compositions include a polymer/crosslinking system which is composed of a self crosslinking resin comprised of a silicone fluid modified with pendant or terminal silanes containing hindered alkoxy groups, or a silanol fluid and a crosslinking compound, of a mixture thereof. These components are first emulsified and then formulated into a latex sealant by blending with a separate emulsion of an appropriate catalyst. Crosslinking occurs upon drying of the emulsion.

Abstract: This invention relates to the preparation of an elastomer which contains a dispersion of a reinforcing system formed in situ within an elastomer host by the interaction of a telechelic hydroxy and/or alkoxy terminated polysiloxane and a reticulating agent having a moiety comprised of at least two alkoxy groups. The invention further includes a rubber composition of at least two elastomers wherein one of said elastomers is a pre-formed composite of elastomer and the in situ formed reinforcement system. A tire having a component of such rubber composition, particularly a tire tread, is specifically contemplated.

Abstract: Compositions comprising a silylated polymer and an adhesion promoter, the silylated polymer having an inorganic or organic backbone and at least two groups thereon selected from alkoxysilyl, aryloxysilyl, alkyloximinosilyl and silanol groups and the adhesion promoter being a silane adhesion promoter of the formula: R1 is a branched or cyclic alkylene group, an arylene group or an alkarylene group, any of which may be optionally interrupted by one or more ether oxygen atoms or a (poly)sulfide bridge, provided that R1 has at least 4 carbon atoms; R2 is an alkyl, aryl or alkaryl radical having 1 to 6 carbons; R3 is a C1 to C6 alkoxy group or a C3 to C5 ketoximato group; R4 is hydrogen, a hydrocarbon group, which may optionally be substituted, or a group which will thermally deblock to form an amine group containing the nitrogen atom to which it is attached; and z is 0 or 1.

Abstract: A room temperature curable organopolysiloxane composition comprising (A) a diorganopolysiloxane both-side terminated with hydroxyl groups, represented by the general formula: HO(R12SiO)nH (wherein R1 represents a monovalent substituted or unsubstituted hydrocarbon group, and n represents an integer of 150 or more), (B) an organohydrogenpolysiloxane having in one molecule at least three hydrogen atoms bonded to silicon atoms, (C) a compound selected from the group consisting of an organosilane having in one molecule at least two alkoxyl groups bonded to silicon atoms and containing at least one primary amino group bonded to a silicon atom through an alkylene group and a partial hydrolysis-condensation product thereof, (D) a metal fatty acid salt, and (E) an organic compound having at least one C═O group in one molecule, capable of reacting the primary amino group of the component-(C) to form water.

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.

Abstract: A composition capable of curing to form an elastomeric mass is disclosed which comprises a polymeric material having at least one hydroxyl or hydrolyzable group bonded to silicon, a crosslinking agent of the formula R—Si—(OR1)3 wherein R denotes an alkyl group having from 4 to 8 carbon atoms and each R1 independently denotes an alkyl or acyl group having from 1 to 20 carbon atoms and a catalyst compound comprising a titanium compound. A method of using the composition as a sealing material is also disclosed.

Abstract: A curable coating composition has a binder comprising a compound or polymer (A) containing at least one primary or secondary amine group, a compound or polymer (B) containing at least one ethylenically unsaturated double bond activated by an adjacent electron-withdrawing group, and a polymer (C) containing at least two silicon-bonded alkoxy groups. Either (A) or (B) contains at least one silicon-bonded alkoxy group in its molecule. The coating is capable of curing at ambient temperature and humidity both by hydrolysis and condensation of the Si—O—C bonds of the polyorganosiloxane (C) and of the aminoalkyl silane (A) and by Michael-type addition reaction of the amine group of the aminoalkyl silane (A) with the activated ethylenically unsaturated double bonds of (B).

Abstract: The invention relates to a novel amino acid silicon polymer with good adhesion to the keratin layer of the skin, a method of preparing the amino acid silicon polymer, a cosmetic particles surface-treated with the amino acid silicon polymer, and a color cosmetic composition including the cosmetic particles. According to the present invention, the particles surface-treated up to 3% to the maximum with the amino acid silicon polymer prepared by reacting an amino acid and a functional silicon polymer in the manner of organic synthesis have water resistance and usability peculiar to silicon-treated pigments and take positive surface charges, thereby offering good adhesion to the skin and durability. Due to these characteristics, the cosmetic containing the surface-treated particles of the present invention is superior in the cosmetic effect to that containing the conventional surface-treated particles.

Abstract: A hydrolyzable group end-blocked organopolysiloxane is prepared by reacting (A) an organopolysiloxane having a silanol group at each end of its molecular chain with (B) an organosilicon compound having hydrolyzable groups or a partial hydrolyzate thereof in the presence of (C) a condensation catalyst. Use is made of a vibratory mixer comprising a conduit through which a fluid flows in an axial direction and an agitating element disposed in the conduit for reciprocal motion in the flow direction. A reactant mixture of necessary components is introduced into the conduit where the components are vibro-agitated by the agitating element while reaction takes place.

Abstract: A silicone oil-in-water emulsion containing a linear noncrosslinked silicone copolymer is prepared by polymerizing an OH endblocked polydimethylsiloxane monomer with an amine functional trialkoxysilane monomer in the presence of a metal catalyst. However, the polymerization is interrupted by the emulsification of this copolymer, and a carboxylic anhydride is added prior to the emulsification. The resulting emulsions are particularly useful in most personal care applications, and they also have value in textile fiber treatment, leather lubrication, fabric softening, as release agents, in water based coatings, for oil drag reduction, lubrication, and for the facilitation of cutting of cellulose materials.

Abstract: An organosiloxane release coating composition useful for coating bakeware.

Abstract: A room temperature vulcanizing (RTV) silicone composition curable in the presence of moisture with rapid development of green strength. The RTV silicone composition comprises (A) 0 to about 85 weight percent polydiorganosiloxanes comprising on average at least 1.2 chain terminations per molecule selected from the group consisting of hydroxysilyl groups and alkoxysilyl groups; (B) about 10 to 95 weight percent polydiorganosiloxanes comprising on average at least 1.

Abstract: The coating composition according to the invention comprises: (A) a component which is the reaction product with oxalic acid of at least one organometallic compound of formula: R1y—M(OR)x-y   (I) wherein, M is a metal R is H or an alkyl radical, R1 is a chelating ligand, x is the valency of the metal, y is an integer at least equal to 1 and x-y is at least equal to 1; and (B) at least one organoalkoxysilane of formula: R3nSi(OR2)4-n   (II) wherein, R2 is an alkyl radical, R3 is an epoxidized alkyl group and n is an integer from 1 to 3 or a mixture of the organoalkoxysilane of formula (II) with an alkoxysilane of formula (II′) R′n′Si(OR″)4-n′  (II′) wherein n′ is an integer from 0 to 3, R″ is H, an alkyl radical or an alkoxyalkyl radical, and R′ is a vinyl, (meth)acryl, aromatic, cyclic or aliphatic alkyl radical. Application for making abrasion-resistant coating on plastic ophtalmic lenses.

Abstract: A three-stage process for the continuous preparation of RTV-1 compositions comprises, in a first step, preparing a raw mixture of &agr;,&ohgr;-dihydroxypolydiorganosiloxane, filler and, if desired, further constituents, in a second step, freeing the raw mixture of gas inclusions under reduced pressure and, if desired, mixing it with further constituents and, in a third step, mixing the degassed raw mixture with a crosslinker, a condensation catalyst and, if desired, additional constituents not yet added in the first and second steps.

Abstract: An oligomer of the formula: [R3SiO1/2]m[O1/2Si(R2)O1/2]n[SiO3/2R]o[SiO4/2]p  (I) wherein each R is selected individually from the group consisting of R1, —OR2 and —OR3; each R1 is independently a substituted or unsubstituted hydrocarbon group; each R2 is a C1-C6 alkyl group or an acyl group; and each R3 is a independently an alkyl or alkenyl group having at least 8 carbon atoms; with the provisos that if R3 is alkenyl, there is no unsaturation within two carbon atoms adjacent to the oxygen atom of the —OR3 group; at least one R group is —OR3; at least one quarter of all R groups are —OR2 or —OR3; m=2 to 20; n=0 to 50; o=0 to 20; and p=0 to 10. The oligomer is a useful component of in insulation formulations for wire and cable used in underground locations.

Abstract: The present invention provides hydrophilically modified curable silicone dental impression materials comprising an addition curable silicone prepolymer composition and a polymerizable hydrophilic modifier. The addition curable silicone prepolymer in the composition of the present invention comprises blended vinyl terminated organopolysiloxane fluids, an organohydrogen polysiloxane crosslinker, a platinum catalyst, a retarder, filler and optional additives. The cured compositions have a stable hydrophilic nature, excellent mechanical properties, and maximum long-term dimensional stability.

Abstract: A condensation curable coating composition comprises the following and any reaction product thereof: (A) a room temperature vulcanizable polyorganosiloxane composition; and (B) a marine foul release-enhancing proportion of at least one organic compatible silicone fluid free from silanol groups and being capable of blooming to the surface of a cured product of component A.

Abstract: Storage-stable crosslinkable RTV-1 compositions comprising at least one tin catalyst obtained by the reaction of at least one organotin compound with at least one monoorthophosphoric acid or mixture of mono and di-orthophosphoric acids, and at least one crosslinkable polysiloxane.

Abstract: A moisture curing composition comprising (a) an oxyalkylene polymer having at least one reactive silicon group in each molecule, (b) bis(3-triethoxysilylpropyl)tetrasulfane, and (c) a condensation catalyst. The presence of the bis(3-triethoxysilylpropyl)tetrasulfane in the composition provides for improved physical properties such as tensile strength and elongation. The present compositions are suitable for use in such applications as sealing materials for construction both in the form of extrudable liquid compositions and as cured preformed configurations such as tapes.

Abstract: The following class of glycidyl and allyl ethers are found to cure at room temperature much faster than their glycidyl and allyl analogs: ##STR1## where: R.sub.1 is selected from the group consisting of:(a) an aliphatic hydrocarbon group containing 2 to 10 carbon atoms; and(b) a group having the formula ##STR2## wherein n=1 to 3,m=0 to 5R.sub.2 and R.sub.2 ' are each selected from the group consisting of an alkyl group containing 1 to 4 carbon atoms, an unsubstituted aryl group, and a substituted aryl group, and R.sub.

Abstract: Anti-fouling coatings comprise a room temperature vulcanizable polyorganosiloxane composition and a polyorganosiloxane free from silanol groups and comprising at least one hydroxy- or alkoxy-terminated polyoxyalkylenealkyl radical. The latter is capable of blooming to the surface of the cured room temperature vulcanizable composition, thus inhibiting the deposition of marine life on the coated article.

Abstract: A solution comprising a composition and a volatile silicone solvent overcomes the environmental disadvantages associated with volatile organic compounds. The invention particularly provides for a primer composition for bonding silicone elastomers to metals that is free of volatile organic compounds comprises an epoxy alkoxy silane, a titanium ortho alcoholate or ortho ester, a silicon ortho alcoholate or ortho ester and a volatile silicone compound.

Abstract: The present invention relates to a siloxane random copolymer having a repeating unit represented by the following general formula (I) (II) and (III) at random and a resin composition containing the same. ##STR1## Further, the invention relates to a process of producing a siloxane copolymer comprising the step of reacting at least one polycarbonate and/or dicarbonate of diol and, if needed, at least one diester of dicarboxylic acid with at least one specified silicon compound in the presence of an esterifying or ester exchange catalyst.

Abstract: This invention discloses hydrophilic additives in polysiloxane gels, elastomers and coatings, and novel processes for producing them. The process comprises:(a) redistributing into polysiloxane-polyether copolymers an unsaturated silane or siloxane,(b) adding to the mixture of reagents a catalytically effective amount of a basic catalyst; and(c) heating the reaction mixture to effect reaction.Novel siloxane structures of unsaturated aliphatic modified polyerther siloxane copolymers are also taught.

Abstract: A method for forming dense ceramics, particularly a ceramic coating by a low temperature treatment is provided. The method for forming ceramics according to the invention is characterized in that a polysilazane having a number-average molecular weight of 100 to 50,000 or a modified polysilazane thereof is subjected to a heat treatment, then exposed to an atmosphere containing water vapor or immersed in distilled water containing a catalyst, or both, or is brought into contact with Pd.sup.2+ ions and water, the polysilazane having a skeleton comprising the unit represented by the following general formula (I): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each independently represents a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, a group other than the above and having a carbon atom directly attached to the silicon atom, an alkylsilyl group, an alkylamino group and an alkoxy group; with the proviso that at least one of R.sup.1, R.sup.2 and R.sup.3 is a hydrogen atom.

Abstract: Symmetric and asymmetric cyclic silalkylenesiloxane monomers and copolymers thereof are disclosed, as well as crosslinked and/or reinforced silalkylenesiloxane copolymers, medical devices containing such materials, and methods of preparation.

Abstract: A stain-proofing agent comprising a compound represented by the formula (1): ##STR1## and non-aqueous composition for paints comprising the stain-proofing agent, resin, curing agent and/or curing catalyst and being capable of forming a coating film remarkably excellent in stain-proofing property.

Abstract: A composition for use in silicone coatings comprising an epoxy resin, an amine functional silane, an organometallic compound and an organic solvent. The composition is used in combination with OH-terminated diorganosiloxane coatings to form resilient films having good freeze-release properties and improved abrasion resistance over previously known coatings.

Abstract: A silphenylene polymer having the general formula: ##STR1## wherein each R is independently a monovalent hydrocarbon group free of aliphatic unsaturation and having 1 to 10 carbon atoms; Ph is a substituted or unsubstituted phenylene group; R.sup.1 is an alkylene group having 2 to 10 carbon atoms or an alkyleneoxyalkylene group; A is a hydrolyzable group or a hydroxy group; B is an alkylene group having 2 to 10 carbon atoms, an alkyleneoxyalkylene group, or an oxygen atom; n is an integer from 0 to 2; x is an integer having a value of at least 1; y is an integer having a value of at least 0; and z is an integer having a value of at least 0.

Abstract: An ultra-high molecular weight MQ resin and a method for its preparation are disclosed. The ultra-high molecular weight MQ resin has weight average molecular weight of at least 100,000, and the ultra-high molecular weight MQ resin is soluble in organic solvents.

Abstract: A radiation-curable silicone rubber composition is provided which includes:(A) a specific organopolysiloxane having radiation-sensitive (meth)acryloyl groups at the both terminals of the molecular chain,(B) a photosensitizer;(C) a tetraalkoxysilane or a partial hydrolysis-condensation product thereof; and(D) optionally together with a specific organic titanium compound. This composition is curable upon irradiation by ultraviolet rays for a short time and exhibits adhesion quickly. Hence, it is useful for the bonding, coating and potting of various substrates. This composition also has a relatively weak adhesion immediately after curing, and can be peeled from the substrate with ease for a while. Hence, it is also suited for uses where repair is required. Because of a high curing rate, it can be effective for, e.g., making a process short, improving productivity and saving energy in the manufacture of electric and electronic parts.

Abstract: A 1-acyloxy-organotetrasiloxane represented by the general formula: ##STR1## wherein R.sup.1 is a monovalent organic group containing an acryloyloxy group or a monovalent organic group containing a methacryloyloxy group, and R.sup.2 is a monovalent hydrocarbon group, and a process for producing the above mentioned 1-acyloxy-organotetrasiloxane, which is characterized by subjecting hexamethylcyclotrisiloxane to a ring-opening reaction with an acyloxysilane represented by the general formula: ##STR2## wherein R.sup.1 is a monovalent organic group containing an acryloyloxy group or a monovalent organic group containing a methacryloyloxy group, and R.sup.2 is a monovalent hydrocarbon group, in the presence of an acidic catalyst.