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: The present invention relates to olefin polymer compositions which can be extruded into film material characterized by improved stability and optical properties. In particular, this application is directed olefin polymer compositions containing specific polyorganosiloxanes bearing a hydroxyl functionality.

Abstract: Resilient, crosslinked silicone elastomers shaped as elastoforming dies or form blocks for the stamping of sheet material workpieces, e.g., ultra-thin sheet metal, and well adopted for applications in the automotive industry, include a crosslinked fluid organopolysiloxane having at least one silicone-compatible organic or inorganic plasticizer within the crosslinked network thereof, said at least one plasticizer being stable and nonmigrating under elastoforming stamping conditions, and said at least one plasticizer being present in such amount that said plasticized silicone elastomer has a Shore 00 hardness of less than about 40.

Abstract: Articles made from normally glossy thermoplastic polymer resins are flatted to reduce gloss by the addition of multi-stage polyorganosiloxane/polyvinyl-based graft polymer flatting agent compositions.

Abstract: A process is described for the production of an oriented, heat-set polyester film including an admixture of polydiorganosiloxane in the amount of 0.001 to 2% by weight, as well as further additives, such as inert inorganic and/or organic particles. The thermoplastic material is melted in an extruder and extruded through an appropriate die to give a cast film, is then quenched, reheated, stretch oriented, and heat set. The characteristic criteria is the addition of the polydiorganosiloxane to the polydiorganosiloxane-free polyester in the form of a masterbatch.

Abstract: A stabilized surface-segregatable, melt-extrudable thermoplastic composition suitable for processing by melt extrusion to form a fiber or film having a differential, increasing concentration of a siloxane-containing primary additive from the center of the fiber or film to the surface thereof, which differential, increasing concentration imparts hydrophilicity to the surface of the fiber or film, which composition includes at least one thermoplastic polymer, at least one siloxane-containing primary additive, and at least one siloxane-containing stabilizing additive. During formation of the fiber or film, the primary additive rapidly segregates in a controllable manner toward the newly-formed surface of the fiber or film, thereby resulting in a controllable differential concentration of the primary additive, which concentration increases with increasing distance from the center of the fiber or film to its surface. The weight ratio of the polymer to the additive is in the range of from about 1 to about 1,000.

Abstract: Silicone rubber adhesive films or sheets are obtained by sheeting a composition comprising 100 parts by weight of organopolysiloxane gum, 30 to 150 parts by weight of wet-process hydrophobic reinforcing silica, a curing agent, and 0.1 to 10 parts by weight of an organoalkoxysilane. These uncured sheets have a tensile strength at break of from 1.5 to 5 kg/cm.sup.2. The adhesive films are characterized by simplicity in handling and an excellent workability combined with excellent tensile adhesive strength. They tightly bond and unify adherend pairs and are particularly suitable for bonding flat surface, such as fabrics, glass, and rubber sheets.

Abstract: A process for improving properties of a synthetic resin powder which comprises: subjecting a latex of a graft-copolymer whose back bone is a rubber to coagulation, and adding a silicone oil to the graft-copolymer in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of said graft-copolymer. According to the present invention, the bulk specific gravity of a synthetic resin powder can be made large, the flowability and blocking resistance can be remarkably improved in comparison with known methods. Accordingly, the blocking during storage can be prevented, a line for transport is not packed with the resin powder, it is possible to automatically weigh the resin powder, and it is applicable to the tendency to grow larger in transport.

Abstract: Insulated electrical conductor and electrical insulation which includes a polyolefin as polymeric base material and a voltage stabilizer included in the polyolefin and comprised of at least one hydrolyzable alkoxy compound, which at least one hydrolyzable alkoxy compound is a liquid at a temperature ranging from about -25.degree. C. to about 140.degree. C. and has a formula:(R.sup.a O).sub.y R.sub.3--y.sup.b X-[R-X'(OR.sup.c).sub.z R.sub.2-z.sup.d ].sub.n -OR.sup.e,where R.sup.a, R.sup.c and R.sup.e are hydrocarbon groups having 1 to 18 carbon atoms; R.sup.b and R.sup.d are saturated or unsaturated, substituted or unsubstituted aliphatic hydrocarbon groups or aromatic hydrocarbon groups having from 1 to 30 carbon atoms; R is a group having a carbon skeleton including at least one heteroatom Y; O is oxygen; X and X' are elements having a valence of four; n varies from 1 to 10, y varies form 0 to 3, z varies from 0 to 2, and where R, R.sup.a, R.sup.b, R.sup.c and R.sub.

Abstract: Compounds of the general formula ##STR1## wherein R.sup.1 is alkyl with 1 to 8 carbon atoms,R.sup.2 is --O-- or --(CH.sub.2).sub.p O--, in which p=2, 3 or 4,R.sup.3 is hydrogen, alkyl with 1 to 4 carbon atoms or acyl,n is 40 to 60m is 0 to 3,x and y being selected so that the molecular weight of the polyoxyalkylene block is 1400 to 3000 and the molar ratio of x:y is 0.8 to 2.2, are added to coating compositions, such as paint, varnish or lacquer, in amounts of 0.001 to 0.5% by weight, based on the coating composition. This improves the scratch resistance and the sliding ability of the cured coatings.

Abstract: A pressure-adherent silicone elastomer composition comprising a homogeneous mixture of a silicone pressure sensitive adhesive composition, a crosslinkable silicone elastomer composition, and, optionally, a viscosity reducing agent. Specifically, the silicone pressure sensitive adhesive composition is a condensation product, having a plasticity of less than 200 mils, of a benzene-soluble resinous copolymer containing silicon-bonded hydroxyl radicals and consisting essentially of triorganosiloxy units of the formula R.sub.3 SiO.sub.1/2 and tetrafunctionalsiloxy units of the formula SiO.sub.4/2 in a ratio of about 0.6 to 0.9 triorganosiloxy units for each tetrafunctionalsiloxy unit present in the copolymer and a polydiorganosiloxane having a viscosity from 100 centipoise to 50,000 centipoise at 25.degree. C.

Abstract: A thermoplastic resin composition comprises (A) 99.9 to 60 parts by weight of a thermoplastic polyester or a polyacetal, (B) 0.05 to 20 parts by weight of a silicone oil having a viscosity of 150,000 cSt or larger and (C) 0.05 to 20 parts by weight of a lubricating oil having a viscosity of 3,000 cSt or smaller and is improved in durability to abrasion.

Abstract: The present invention is directed to aqueous coating compositions suitable for use as coating and finishing agents for surface coatings, preferably PVC or polyurethane coatings, based on sedimentation-stable polyurethane dispersions having a solids content of about 10-70% by weight wherein the polyurethane-urea solids material is based on polyester diols, low molecular weight diols and optionally triols, chemically incorporated hydrophilic groups, specific mixtures of diisocyanates and polyamine chain extenders having an average functionality of greater than 2 and wherein the aqueous preparations additionally contain alkoxylated dimethyl-polysiloxanes and water-soluble polyethylene oxides. The present invention is also directed to a process for applying top coats and finishes to surface coatings, preferably PVC or polyurethane surface coatings, wherein the above-described aqueous coating and finishing agents are used as the top coat and the coatings are cured at about 70.degree.-170.degree. C.

Abstract: A self-lubricating wear part is formed of a thermoplastic resin composition which exhibits improved durability to abrasion. The resin composition includes a thermoplastic polyester resin or polyacetal resin in an amount between 99.9 to 80.0 parts by weight, and a silicon oil having a viscosity of 150,000 cSt or more in an amount between 0.1 to 20 parts by weight.

Abstract: Compounds of the general formula I ##STR1## in which R.sup.1 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, phenyl or benzyl and R.sup.2 is hydrogen or C.sub.1 -C.sub.4 -alkyl, or R.sup.1 and R.sup.2, together with the C atom to which they are attached, form a 5-membered or 6-membered ring, and R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are identical or different and are hydrogen, C.sub.1 -C.sub.12 -alkyl, phenyl which is unsubstituted or monosubstituted to trisubstituted by C.sub.1 -C.sub.4 -alkyl, halogen or C.sub.1 -C.sub.4 -alkoxy, or is a group of the formula --CH.sub.2 OR.sup.7 (II) in which R.sup.7 is C.sub.1- C.sub.12 -alkyl, phenyl which is unsubstituted or monosubstituted to trisubstituted by C.sub.1 -C.sub.4 -alkyl, halogen or C.sub.1 -C.sub.4 -alkoxy, or is --C(O)--R.sup.8, and R.sup.8 is C.sub.1 -C.sub.12 -alkyl, and also not more than two of the radicals R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are one or two groups of the formula --CH.sub.2 CH.sub.2 Si(OR.sup.9).sub.3 (III), --CH.

Abstract: There is provided a flame retardant for thermoplastic resins comprising(i) 20 to 60% by weight a silicone oil;(ii) 10 to 40% by weight a silicone resin;(iii) 5 to 60% by weight a gassing agent selected from the group consisting of compounds containing both phosphorus and nitrogen or a mixture of phosphorus containing compounds with nitrogen containing compounds and(iv) a polyhydric alcohol in a weight ratio to said gassing agent ranging from about 1/9 to about 1/5.

Abstract: Polyalkoxysilyl-terminated polydiorganosiloxanes which are relatively stable in viscosity over prolonged storage periods are prepared by endcapping a silanol-terminated polydiorganosiloxane in the presence of a catalytic amount of an acidic amine salt which subsequently decomposes to substantially inert products, preferably an amine salt of formic acid, and in the absence of silicon-nitrogen compounds and enoxysilanes normally used as catalyst quenchers and scavengers. The products are useful for the preparation of scavenger-free room temperature vulcanizable compositions, particularly when combined with certain N-alkoxy-silylalkyl-substituted compounds as adhesion promoters.

Abstract: The presence of an incompatible liquid, polydiorganosiloxane wherein from 1 to 30 percent of the siloxane units contain an ethylenically unsaturated hydrocarbon radical in high-consistency organosiloxane compositions that cure by a platinum-catalyzed hydrosilation reaction substantially improves the tear strength and elongation of cured elastomers prepared from these compositions.

Abstract: An in-mold lacquer coating, and a process for utilizing the same, for producing a polyurethane-based molded article. The lacquer coating is mold-releasable without the aid of an external mold release agent, is re-coatable after de-molding without additional surface preparation, and comprising a mixture of a pre-reacted aliphatic polyurethane resin, a technically simple silicon resin mold-release agent, and an aromatic, acetate and alcoholic solvent system that is incompatible with the silicon resin and that has constituents with specific gravities less than the silicon resin and with varying rates of evaporation such that the ratio of aromatic to alcoholic solvents decreases as the solvent system evaporates.

Abstract: A sealant or coating composition admixture contains a blocked isocyanate-terminated prepolymer in which generally all of the NCO groups are blocked, a curing agent such as a polyamine or a polyimine, and a functional silane or siloxane nonreactive with blocked isocyanates. The sealants or coating compositions when cured have improved properties such as adhesion.

Abstract: A wear-proof paint for polymers such as rubber or plastic comprising by weight parts, urethane prepolymer A 100 parts, urethane prepolymer B 20-60 parts, silicon oxide 15-50 parts, carbon 2-6 parts and grease 2-10 parts. The paint is particularly adapted for painting door glass-run, weather strip or wiper of automobiles.

Abstract: A curable composition comprising (A) an organic polymer containing at least one reactive silicon functional group crosslinkable to produce an elastomer by the formation of a siloxane bond in its molecule and (B) an organic silicon compound having a molecular weight of not less than 140 and represented by the formula (1):[(CH.sub.3).sub.3 SiO].sub.n R.sup.1 (1)wherein R.sup.1 is a residue of an alcohol or a weak acid which has a valency of n, and n is a positive integer. The composition of the invention can give cured product having excellent modulus and elongation as well as has excellent storage stability.

Abstract: The extrudability of linear polymers of ethylene such as low density copolymers of ethylene and C.sub.4 -C.sub.10 olefins (LLDPE) into thin films is improved by adding small amounts, e.g. 250 to 1000 ppm of each of a fluorocarbon polymer, e.g. polyvinylidene fluoride, and of a polyalkylsiloxane, e.g. poly(methyl-octyl-siloxane), to reduce melt fracture, head pressure and extruder power.

Abstract: Silicone containing paint compositions containing aqueous dispersions of(a) organopolysiloxanes; and(b) an ethylene-vinyl chloride copolymer which does not exceed the weight of the organopolysiloxanes.

Abstract: A composition and method for forming elastomeric pressure sensitive adhesives comprising a mixture of (A) a xylene-soluble resin copolymer of 0.6 to 0.9 triorganosiloxy units per SiO.sub.4/2 unit and having less than 0.7 weight % silicon-bonded hydroxyl units. (B) a polydiorganosiloxane fluid endcapped with silicon-bonded hydroxyl groups and having a viscosity of from about 50 to 300,000 cP. at 25.degree. C., an organosilicon compound containing an average of more than two silicon-bonded alkoxy groups per molecule, and a condensation catalyst. The cured elastomeric pressure sensitive adhesives formed from these compositions are useful as medical adhesives, such as those used for ostomy seals.

Abstract: The present invention provides an oil-containing resin having a flowability of not more than 45.degree. in terms of an angle of repose, which comprises a porous styrene-divinylbenzene copolymer and a liquid oil adsorbed on the copolymer, an oil-containing resin mixture in a paste form of the oil-containing resin and a liquid oil, and a composition of the oil-containing resin mixture in a paste form and a thermoplastic resin. Owing to a good flowability, the oil-containing resin has a good moldability, and also owing to a high oil content, a molding having distinguished sliding characteristics is obtained from the composition of the oil-containing resin mixture in a paste form and a thermoplastic resin.

Abstract: Resilient, crosslinked silicon elastomers shaped as elastoforming dies or form blocks for the stamping of sheet material workpieces, e.g., ultra-thin sheet metal, and well adopted for applications in the automotive industry, comprise a crosslinked fluid organopolysiloxane including at least one silicon-compatible organic or inorganic plasticizer within the crosslinked network thereof, said at least one plasticizer being stable and nonmigrating under elastoforming stamping conditions, and said at least one plasticizer being present in such amount that said plasticized silicone elastomer has a Shore 00 hardness of less than about 40.

Abstract: A method for producing an .alpha.-olefin block copolymer, which comprises polymerizing propylene alone or together with a small amount of other .alpha.-olefin in the presence of a catalyst comprising a titanium-containing solid catalyst component and an organoaluminum compound, and then polymerizing the resulting propylene polymer with an .alpha.-olefin other than propylene, alone or together with propylene in a gas phase without deactivating the catalyst, characterized in that the gas phase polymerization is conducted in the presence of a siloxane or a polysiloxane in an amount of from 1.times.10.sup.-6 to 0.1 by weight ratio relative to the weight of said propylene polymer.

Abstract: Diorganopolysiloxanes having the formula: ##STR1## are especially useful for the stabilization of polyvinyl chloride-based polymers.

Abstract: A polymer composition is provided comprising at least one poly(arylene sulfide), at least one polysiloxane, at least one trialkoxysilane, and at least one solid, resinous polyolefin. Molded objects made of this polymer composition have greater impact strength than those made of poly(arylene sulfide), preferably poly(phenylene sulfide). In one embodiment, an additive composition comprising at least one polysiloxane, at least one trialkoxysilane and at least one solid, resinous polyolefin is provided. The additives can be blended with poly(arylene sulfide) so as to improve its impact strength. In another embodiment, a polymer composition is provided comprising at least one poly(arylene sulfide), at least one polysiloxane having molecular in the range of from about 100,000 to about 400,000, and optionally at least one trialkoxysilane.

Abstract: Organopolysiloxanes curable into elastomeric state, well adapted as sealing materials for a variety of substrates and useful, e.g., in the automotive industry, are comprised of a polyhydroxylated polysiloxane, a polyacyloxysilane crosslinking agent, and an effective amount of at least one calcium oxide, strontium oxide and/or barium oxide cure accelerator therefor. The subject compositions are stable for at least 10 minutes at ambient temperature and crosslink on heating and/or addition of an aqueous or liquid carboxylic acid promoter thereto.

Abstract: Storage-stable diorganopolysiloxanes curable into adhesive/elastomeric state, well adapted as coatings and sealants, e.g., for adhering a wide variety of building construction materials such as glass, aluminum and PVC, are comprised of an .alpha.,.omega.-dihydroxydiorganopolysiloxane polymer, a ketiminoxysilane crosslinking agent therefor, and an effective amount of a tackifier which comprises a (.DELTA..sup.2 -imidazolinyl)alkylsilane.

Abstract: Thixotropic, silica-filled coating compositions wherein the curable film-forming material is an organosiloxane copolymer resin include a liquid polydiorganosiloxane containing hydroxyl-terminated polyoxypropylene units as the flow control agent. The compositions are particularly useful as screen printable passivation coatings for semiconductor devices.

Abstract: Single-component diorganopolysiloxane compositions which are storage-stable in the absence of atmospheric moisture and which crosslink into silicone elastomeric state in the presence of moisture, are comprised of an alkoxy-terminated diorganopolysiloxane, a functionalization catalyst containing a primary or secondary amine group, a tin condensation catalyst, a filler material, and an effective stabilizing amount of an alkyl or aryl isocyanate-substituted diorganopolysiloxane.

Abstract: A silk-screenable circuit paste which can be screen-printed onto a circuit board with minimum pinholing or void formation is provided. The silk-screenable circuit paste of the present invention includes electrically conductive powder, a binding resin, an organic silicone material, and an organic solvent system including ethylene glycol diacetate and a suitable cosolvent.

Abstract: The subject invention relates to polytetramethylene adipamide resin compositions containing 100 parts by weight of the polyamide and 2 to 20 parts by weight of a silicon oil. Objects produced from the composition possess good surface appearance, excellent sliding properties and high heat resistance and rigidity.

Abstract: Heat-vulcanizable organopolysiloxane compositions well adopted for extrusion and molding, and facilely converted into elastomeric shaped articles having improved physical and electrical properties, e.g., seals and sections, include a diorganopolysiloxane oil containing from 0.05 to 3 mol % of vinylsiloxy recurring units, as well as an amine having a pKa greater than 7.5 in aqueous solution at 25.degree. C. and a boiling point of less than 270.degree. C. at atmospheric pressure.

Abstract: An aromatic carbonate resin composition comprising:(i) at least one aromatic carbonate resin;(ii) at least one polyolefin;(iii) at least one fluorinated polyolefin; and(iv) at least one silicone fluid;components (ii)-(iv) being present in amounts which are effective to improve the wear resistance of said aromatic carbonate resin.

Abstract: The invention relates to polymer mixtures which comprise a polyphenylene ether and short, "pristine", reinforcing fibres. The mechanical properties of articles formed from the polymer mixtures according to the invention are improved by the addition of a hydrogen siloxane compound.

Abstract: A polymer composition is provided comprising at least one poly(arylene sulfide), at least one polysiloxane, at least one trialkoxysilane, and at least one solid, resinous polyolefin. Molded objects made of this polymer composition have greater impact strength than those made of poly(arylene sulfide), preferably poly(phenylene sulfide). In one embodiment, an additive composition comprising at least one polysiloxane, at least one trialkoxysilane and at least one solid, resinous polyolefin is provided. The additives can be blended with poly(arylene sulfide) so as to improve its impact strength. In another embodiment, a polymer composition is provided comprising at least one poly(arylene sulfide), at least one polysiloxane having molecular in the range of from about 100,000 to about 4000,000, and optionally at least one trialkoxysilane.

Abstract: A curable fluorosilicone rubber composition comprising particular organopolysiloxane having a fluoroalkyl group and having a viscosity of 1,000 cP or more at 25.degree. C., reinforcing silica powder having a specific surface area of 50 m.sup.2 /g or more, and a vulcanizing agent; which further comprises, as a fluid for bleed, a fluid organopolysiloxane compound represented by General Formula: ##STR1## wherein some R' represent methyl groups and other R' represent phenyl groups; the ratio of the number of the methyl group to the number of the phenyl group in the molecule ranges between 70/30 and 25/75; and n is an integer of 0 to 5.Rubber obtained by curing of this composition has excellent oil and solvent resistance, thermal resistance and low-temperature resistance which are inherent in ordinary fluorosilicone rubber, and moreover has a good fluid-bleeding property.

Abstract: A thermoplastic-rubber polymer alloy contains a tough, wear resistant low friction thermoplastic such as ultra high molecular weight polyethylene, a cured rubber compound such as nitrile rubber, an a lubricant such as graphite in effective amounts to produce a composition which has good wet and dry friction and wear properties. The ultra high molecular weight polyethylene is typically utilized in a sufficient amount so as to form a continuous phase with the thermoset rubber being present as particles dispersed throughout the polyethylene as a discontinuous phase. The polymer alloy is made by dry blending the thermoplastic compound with ground thermoset rubber whereby the rubber is coated, heating and mixing the composition to above the glass transition temperature of the thermoplastic compound and subsequently cooling under pressure. The alloy can be easily transfer molded because of the lubricating action of the heated, softened plastic.

Abstract: Methylphenylsiloxane coating compositions comprising silica fillers and aluminum particulates, e.g., matte paints, are well adopted for the provision of hard nonadhesive finishes, e.g., on kitchen utensils.

Abstract: A titanium chelate catalyst for a room temperature vulcanizable silicone rubber composition which does not form nodules upon storage where the catalyst has the formula, ##STR1## where s varies from 0.7 to 1.3 and t varies from 0.7 to 1.3. Preferably s varies from 0.8 to 1.2 and t varies from 0.8 to 1.2.

Abstract: A silicone crumb in a fine particulate form has an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals. This crumb is made from a vinyl-containing polyorganosiloxane, a silicon-bonded hydrogen containing polysiloxane, a platinum catalyst, and a heat stability additive compound containing zirconium, titanium, or hafnium and organosiloxane. The crumb is useful in hydraulic applications where it is exposed to temperatures above 500.degree. F. for prolonged periods of time.

Abstract: Thermoplastic polymers or resins containing amide groups such as the nylons can readily be brominated or chlorinated in organic solvents to convert the (--NH--) units to (--NBr--) or (--NCl--) units and to form solutions of the N-brominated or N-chlorinated thermoplastic polymers or resins. These N-brominated or N-chlorinated thermoplastic polymer or resin solutions can be blended with silicones (siloxanes) and optionally with at least one finely divided material selected from the group consisting of inorganic and organic fillers and pigments and then can be coated on a cellular or solid rubbery hydrocarbon polymer substrate, such as an EPDM rubber in the form of a weatherstrip or glass run channel, dried and irradiated with ultraviolet light or heated at a temperature and for a period of time sufficient to reform the amide groups and to provide the rubbery substrate with an adherent and abrasion resistant coating which also exhibits a reduced coefficient of friction.

Abstract: An oriented, heat sealable polymer film laminate possessing a low coefficient of friction, good receptivity for water-based coatings and good optical clarity and a method for manufacturing such a laminate are provided.

Abstract: A novel pigment print paste for the coloration of textiles includes an additive comprising a diorganopolysiloxane. In particular, the diorganopolysiloxane contains reactive functional substituents which will react with other components of the pigment print paste, such as the binder or the clear diluent. Specifically, polydimethylsiloxane, diorganopolysiloxanes carrying side chains containing an amino, epoxy, or carboxyl functional group are illustrative additives. The diorganopolysiloxane may be terminated with alkoxy or hydroxy radicals. Heating a pigment printed textile results in coreaction, or cross-linking, producing advantageous results such as improved color fastness, improved resistance to crocking and abrasion, improved washability, and good hand properties in the printed area.

Abstract: What is disclosed are organopolysiloxane release coatings which are curable on a substrate and which consist of a base siloxane copolymer containing CH.sub.3 SiO.sub.3/2 units; C.sub.6 H.sub.5 SiO.sub.3/2 units, C.sub.6 H.sub.5 (CH.sub.3)SiO units and (C.sub.6 H.sub.5).sub.2 SiO units; CH.sub.3 SiO.sub.3/2 ; a fluid polysiloxane, and a curing agent. They are especially useful on commercial and household cookware and bakeware.

Abstract: There is provided curable compositions of free-radical polymerizable organic monomers and polymers and cyclicsilylpinacoles which can be used in combination to make such curable compositions.