Abstract: A composition curable to a silicone rubber exhibits adhesion to metal and glass substrates under both dry and wet conditions where the composition contains an alkenyl-containing polydiorganosiloxane, an organohydrogensiloxane, a hydrosilation catalyst containing platinum, an (epoxy-functional organo)trialkoxysilane, an alkoxy-silicon compound, and a titanium compound having Ti--O--CH bonds and the molar amount of alkoxy-silicon compound exceeds the molar amount of (epoxyfunctional organo)trialkoxysilane.

Abstract: Improved thermoplastic compositions characterized by high tensile elongation values are described. They comprise polyphenylene ether resin, a hydrogenated elastomeric block copolymer having an A-B-A' structure, with specific molecular weight values for the copolymer blocks and a phenylsiloxane fluid of particular composition. Electrical conductor articles which include polymerized thermoplastic compositions as mentioned above represent another embodiment of this invention.

Abstract: In an active hydrogen-containing B-side composition for reaction with a polyisocyanate-containing A-side composition to make a polyurethane or polyurethaneurea elastomer by reaction injection molding, the improvement which comprises a mold release composition which is the reaction product of triethylenediamine and a C.sub.2 -C.sub.21 epoxide reacted in the presence of a carboxy functional siloxane.

Abstract: The present invention relates to waterproofing sealer compositions that protect various types of porous substrates from deterioration due to water absorption and thus extend their useful lives. Example of porous substrate are concrete, brick, masonry, ceramics, stones, cloth, wood and the like. These waterbased compositions comprise alkali metalalkylsiliconates, alkali silicates, polymers, diluents and additives.These sealer compositions do not change appearance and character of the substrate surface.

Abstract: A thermoplastic composition is provided comprising an acrylonitrile-butadiene-styrene graft copolymer, polycarbonate and an epoxy functional silicone. The compositions exhibit reduced gloss and enhanced low temperature impact strengths and are useful as molding resins.

Abstract: This invention relates to polymers having enhanced hydrophilicity and thermal regulative properties. Exemplary polymers include aliphatic polyamide polymers and polyester polymers. The polymer has bonded thereto a hydrophilic polysiloxane having an affinity for the polymer and having a molecular weight greater than about 1000 g/mol preferably greater than about 2000 g/mol, and preferably greater than about 4000 g/mol. The polymer has substantially no polymerization with the hydrophilic polysiloxane. Alternatively, an aliphatic polyamide polymer is provided having enhanced hydrophilicity and thermal regulative properties. The polymer has bonded thereto an anionic hydrophilic polysiloxane having an affinity for the aliphatic polyamide polymer. The aliphatic polyamide polymer has substantially no polymerization with the anionic hydrophilic siloxane.

Abstract: A crosslinkable polymer composition comprises an olefin copolymer or graft copolymer with hydrolysable saline groups and a silanol condensation catalyst, as well as a silane compound with at least one hydrolysable organic group. The polymer composition is characterized in that the silane compound has a compatibility with the polymer composition of at least 0.035 mole hydrolysable groups per 100 g polymer composition, and in that the silane compound is represented by the general formula: R.sup.1 (SiR.sup.2.sub.n X.sub.3-n).sub.m, wherein R.sup.1 is a monofunctional hydrocarbyl group having 13-30 carbon atoms, or a difunctional hydrocarbyl group having 4-24 carbon atoms, R.sup.2 is a hydrocarbyl group having 1-10 carbon atoms, X is a hydrolysable organic group, n is 0, 1 or 2, and m is 1 or 2.

Abstract: A melt-extrudable thermoplastic composition is provided which includes a thermoplastic polyolefin and an additive system made up of a first component and a second component, in which (A) the first component is a defined polysiloxane polyether having a molecular weight of from about 350 to about 18,000 and which is present in an amount of from about 0.1 to about 3 percent by weight, based on the amount of thermoplastic polyolefin; and (B) the second component is a hydrophobic fumed silica, in which the weight ratio of the first component to the second component is in the range of from about 20 to about 300. Such composition yields, upon melt-extrusion, either nonwoven webs having significantly increased tensile strengths when compared to nonwoven webs prepared from the thermoplastic polyolefin alone, or wettable webs requiring an amount of first component which is significantly less than that required in the absence of the second component.

Abstract: A surface-segregatable, melt-extrudable thermoplastic composition is provided which includes (A) a thermoplastic polypropylene-polyethylene block copolymer in which the polyethylene blocks constitute from about 1 to about 10 percent by weight of the copolymer and (B) a defined trisiloxane polyether additive having a molecular weight of from about 350 to about 1,400, which additive is present in an amount of from about 0.1 to about 5 percent by weight, based on the amount of thermoplastic block copolymer. The use of the block copolymer unexpectedly permits the use of significantly reduced amounts of additive while still providing nonwoven webs which are immediately wettable and which do not become significantly less wettable over time.

Abstract: An aqueous starch oil sizing composition is provided which produces improved processibility in woven and non-woven applications. The sizing combines a high amylose corn starch which has been derivatized with propylene oxide, with a low amylose highly crosslinked corn starch. The sizing also includes lubricants which may be oils or waxes and a lubricant which is the salt of a polyamino functional polyamide resin. Other emusifiers, humectants, lubricants, defoamers, and biocides may be present. The size also includes a silane coupling agent such as gamma glycidoxy propyl trimethoxy silane which can be hydrolyzed. Strands of glass fiber which have been treated with this size have shown a reduced tendency to shed the size from the strands, a reduction in the buildup of broken filaments or "fuzz" on processing equipment and reduced strand breakage.

Abstract: Disclosed herein are electronic device sealing resin compositions containing (A) 40-25 parts by weight of a thermoplastic resin composed of 100-10 wt. % of a poly(arylene thioether-ketone) and 0-90 wt. % of a poly(arylene sulfide), (B) 60-75 parts by weight of an inorganic filler, and per 100 parts by weight of the sum of the thermoplastic resin (A) and inorganic filler (B), (C) 1.5-5 parts by weight of a silicone oil, (D) 10-15 parts by weight of a silicone rubber or (C) 0.5-3 parts by weight of a silicone oil and (D) 5-13 parts by weight of a silicone rubber. Electronic devices sealed using such resin compositions are also disclosed.

Abstract: In an active hydrogen-containing B-side composition for reaction with a polyisocyanate-containing A-side composition to make a polyurethane, polyurethaneurea or polyurea elastomer by reaction injection molding, the improvement which comprises a mold release composition consisting essentially of (1) the reaction product of a mixture of a phenol compound, a tertiary amine, and a reactive epoxide and (2) a carboxy functional siloxane.

Abstract: The compatibility between high consistency fluorinated and non-fluorinated polydiorganosiloxanes is increased, with a resultant increase in the physical-properties of elastomers prepared from mixtures of these polymers, by blending the polymers together with a reinforcing silica filler that is reacted with both fluorinated and non-fluorinated liquid polydiorganosiloxanes as filler treating agents. The high consistency polydiorganosiloxanes contain at least two alkenyl radicals per molecule and are cured by a hydrosilation reaction.

Abstract: A process for preserving cellular structures includes the steps of pre-treating the structures with a polymeric water solution, drying the structures and then post-treating the structures with an organic solvent, non-water-base solution. Once the structure has been treated with the pre-treatment solution, the specimen is allowed to sit for a predetermined period of time in order for the active ingredients of the solution to penetrate the surface area of the specimen. The specimen is then preferably freeze-dried. The specimens are then treated with a non-water-based post-treatment solution of water-resistant, film-forming polymeric resin to form a barrier coat on the finished product.

Abstract: A silicone rubber composition comprising(A) 100 parts by weight of a polyorganosiloxane having, per molecule, at least two structural units represented by the following formula:(R.sup.1).sub.a (R.sup.2).sub.b SiO.sub.(4-(a+b))/2 (I)(B) a polyorganohydrogensiloxane comprising structural units shown by the following formula:(R.sup.3).sub.c H.sub.d SiO(4-(c+d))/2 (II)and having at least three silicon-bonded hydrogen atoms per molecule, the amount of component (B) being such that the number of silicon-bonded hydrogen atoms in component (B) is from 0.5 to 4.0 per R.sup.1 group in the structural units shown by formula (I) of component (A),(C) from 0.1 to 10 parts by weight of a compound selected from the group consisting of an organosilicon compound having, per molecule, at least one silicon-bonded hydrogen atoms and at least one group represented by the following formula: ##STR1## and an acrylic- or methacrylic-functional silane coupling agent, (D) from 0.

Abstract: Improved thermoplastic compositions characterized by high tensile elongation values are described. They comprise polyphenylene ether resin, a hydrogenated elastomeric block copolymer having an A-B-A' structure, with specific molecular weight values for the copolymer blocks and a phenylsiloxane fluid of particular composition. Electrical conductor articles which include polymerized thermoplastic compositions as mentioned above represent another embodiment of this invention.

Abstract: The invention provides a thermal and addition curable silicone release coating comprising a mixture of an epoxysilicone controlled release additive containing at least one tri- or quadri-functional siloxane unit, a vinyl-functional silicone base polymer, a temperature-dependent hydrosilation inhibitor and an effective hydrosilation catalyst.

Abstract: One-part, ambient moisture-curable polyurethane adhesives are produced by reacting with a polyol selected from the group consisting of polyether diols, triols and tetrols based on propylene glycol or ethylene-capped propylene glycol and mixtures thereof with an organic polyisocyanate for a sufficient time to form a reaction product including an isocyanate-terminated prepolymer and unreacted isocyanate, admixing with the reaction product talc or another additive containing free water which reacts with the unreacted isocyanate to extend the chain of the polyurethane and provide hard segments therein, allowing the water-isocyanate reaction to proceed until a predetermined amount of unreacted isocyanate remains and introducing the resulting adhesive into a substantially hermetically sealed container or package.

Abstract: An organocyclosiloxane having utility as a coupling agent is disclosed, said organocyclosiloxane having the general formula ##STR1## wherein R.sup.1 is independently selected from monovalent hydrocarbon groups having 1 to 8 carbons, R.sup.2 is selected from the group consisting of an alkoxy group and an alkoxysilylalkyl group, R.sup.3 is an organofunctional group selected from the group consisting of glycidoxyalkyl, methacryloxyalkyl, N-(trialkylsilyl)aminoalkyl, (hydroxyphenyl)alkyl and haloalkyl, x is 1 to 6 and y is 1 to 6, with the proviso that x+y is an integer having a value of 3 to 8.

Abstract: Organosiloxane compositions curable by a platinum-catalyzed hydrosilation reaction contain as the adhesion promoter a silane comprising an silicon-bonded alkenyl radical containing at least five carbon atoms and at least one alkoxy group. The silane or a hydrolysis-condensation product thereof is optionally used in combination with a catalyst that promotes reaction of the silane with groups present on the surface of the substrate to which bonding is desired.

Abstract: The invention relates to aqueous dispersions containing aminooxy crosslinking agents, of copolymers containing carbonyl groups, to processes for the preparation thereof and to the use thereof as a crosslinking system in binders, adhesives and coating agents.

Abstract: A thermoplastic molding composition is disclosed containing a polycarbonate resin and(i) 0.1 to 10.0 percent of a polyalkylene oxide corresponding to formula (I) ##STR1## in which R represents H, C.sub.1-6 alkyl, tetrahydropyranyl or a silyl radical,R' represents H or C.sub.1-6 alkyl andx is an integer of 1 to 100, and(ii) 0.1 to 10 percent of an aromatic compound which contains at least one sulfonic acid ester substituent, said percent being relative to the weight of said polycarbonate. The composition which is resistant to the effects of gamma radiation is suitable for the preparation of sterilizable medical instruments.

Abstract: A flame-retardant resin composition comprising the following components (A), (B), (C) and (D): (A) 100 parts by weight of a thermoplastic resin comprising 1 a polycarbonate resin, or 2 a polycarbonate resin and a non-polycarbonate resin, (B) from 0.1 to 40 parts by weight of a phosphorus compound, (C) from 0.001 to 40 parts by weight of a boron compound, and (D) from 0.01 to 5 parts by weight of a polyorganosiloxane and/or from 0.001 to 5 parts by weight of a fluorine resin.

Abstract: A fluid-permeable agent for providing fluid-permeability to non-woven sheets of polyolefin fibers contains 50 wt % or more of polyoxyalkylene modified silicone shown by Formula (A) given below: ##STR1## where x is an integer in the range of 1-10, y is an integer in the range of 7-100, a is an integer equal to or greater than 5, b is an integer equal to or less than 95, (a+b) is an integer equal to or less than 100 and R.sup.1 is H or alkyl group with 1-12 carbon atoms. The agent may additionally contain surfactants of certain specified kinds and is applied at a rate of 0.1-0.5 wt % with respect to the fibers for good results.

Abstract: The present invention relates to improved flame retardant insulation/jacketing compositions for wire and cable products based on ethylene-vinyl ester and ethylene-alkyl acrylate copolymers. The copolymers are formulated with a hydrated inorganic filler, an alkoxysilane, a crosslinking agent, a processing additive and a combination of specific antioxidants, namely, a pentaerythritol betaalkylthiopropionate and a hindered phenol. The formulations stabilized with the pentaerythritol betaalkylthiopropionate/hindered phenol combination have good heat stability and do not tarnish or discolor the surface of the copper conductor upon steam vulcanization.

Abstract: Disclosed is a novel polypropylene resin composition which is outstandingly free from surface tackiness and still has good transparency so as to be useful as a material of resin films used for wrapping. The resin composition comprises, as a uniform blend, (a) 100 parts by weight of a polypropylene resin, and (b) from 0.01 to 10 parts by weight of an inorganic oxide powder which is a product obtained by the deflagration of an inorganic oxidizable powder, e.g., an elementary silicon powder, in an oxidizing atmosphere such as air. By virtue of the unique method for the preparation of the silicon dioxide powder, the particles have high surface activity so that the surface properties of the resin composition or, in particular, resin films prepared therefrom can be greatly improved even with a relatively small amount of the inorganic oxide powder compounded as an anti-blocking agent not to badly affect the transparency.

Abstract: Solutions of polycondensates which have N-containing heterocyclic ring systems as structural units, or solutions of intermediates of these polycondensates, in inorganic solvents, contain from 0.1 to 20% by weight, based on the polycondensates or the intermediates thereof, of one or more azidosilanes of the general formulaN.sub.3 --R.sup.3 --Si--R.sup.1.sub.n (OR.sup.2).sub.3-n Iwhere R.sup.1 is C.sub.1 -C.sub.3 -alkyl, phenyl, benzyl or toluyl, R.sup.2 is C.sub.1 -C.sub.4 -alkyl, C.sub.2 -C.sub.4 -alkoxyalkyl, phenyl or benzyl, R.sup.3 is C.sub.1 -C.sub.8 -alkylene which may be interrupted by an oxygen atom, a sulfur atom or a --(N--R.sup.4) -group, where R.sup.4 is hydrogen, methyl, ethyl or phenyl, and n is 0, 1 or 2.

Abstract: A flame-retardant resin composition includes a thermoplastic polyester, a flame retardant containing an organic halide compound in an amount required for providing flame-retardancy, an antimony compound, and an alkoxidesilane compound in an amount required for providing thermostability. The flame-retardant resin composition has a high strength and excellent thermal stability.

Abstract: A curable organopolysiloxane composition comprising (A) an organopolysiloxane having at least two alkenyl groups and a viscosity of 100 to 200,000 cs, (B) a specific organopolysiloxane having an alkoxysilyl group, (C) an organohydrogen polysiloxane having at least two hydrogen atoms attached to silicon atoms, and (D) an addition reaction catalyst is improved in adhesion. It cures to substrates of metals, glass, rubber and plastics to form a firm bond even in low temperature or brief high temperature curing conditions.

Abstract: Liquid silicone compositions are described that cure to rubber which exhibits a unique combination of properties including low compression set and unprimed adhesion to a variety of substrates. The compositions include silicone polymers curable by hydrosilation reaction and specific combinations of adhesion promoting materials. Compositions containing aluminum chelates and epoxytrialkoxysilanes have been found particularly useful when adhesion to metal substrates is desired. When the compositions are desired to adhere to plastic materials, it is advantageous to include along with the aluminum chelate and epoxytrialkoxysilane, a tetraalkyltitanate, an alkylpolysilicate, and an acrylate or methacrylate compound.

Abstract: A polyisocyanate composition comprising 0.1% by weight or more and less than 10% by weight of a silicate compound dissolved or dispersed into at least one kind of polyisocyanate compound selected from the group consisting of diphenylmethane diisocyanate oligomers containing 20 to 60% by weight of diphenylmethane diisocyanate and the derivatives thereof. This composition has an excellent low temperature storage stability.

Abstract: A film-forming organopolysiloxane composition is disclosed which imparts an excellent releaseability and lubricity to the surface of various types of rubber materials. The composition comprises a solvent dispersion of(a) 50 to 90 weight percent of a block organopolysiloxane copolymer;(b) 2 to 50 weight percent of a compound selected from the group consisting of an organosilane or a partial hydrolyzate thereof;(c) 4 to 40 weight percent of a mixture an epoxy group-containing organoalkoxysilane and an alkenyl group-containing organoacetoxysilane in a weight ratio of 1:9 to 9:1 or a condensation-reaction product thereof;(d) 0.1 to 10 weight percent of an hydroxy or alkoxy terminated diorganopolysiloxane; and(f) 0.1 to 10 weight percent of a condensation-reaction catalyst.

Abstract: Novel neopentasiloxane compounds of the general formula Si[OSiR.sub.2 Q].sub.4 wherein R denotes a monovalent hydrocarbon or halohydrocarbon group and Q denotes a group R or a group comprising a block of at least two oxyalkylene units and having a terminal group containing a reactive hydrogen atom, not more than one Q denoting an R group.The invention also encompasses a film-forming composition comprising a curable polyurethane resin and the neopentasiloxane, and the use of the film-forming compositions to provide breathable (water vapour permeable) coatings on textile fabrics.

Abstract: Silicone rubber compositions based on an organopolysiloxane are improved in release properties by blending a silane having both a fluorinated hydrocarbon group and an alkanoyloxy group and/or an organopolysiloxane having an alkanoyloxy or alkanoyloxyalkyl group.

Abstract: A flame-retardant resin composition obtained by irradiating with ionizing radiation a resin composition comprising 100 parts by weight of a thermoplastic resin, from 100 to 250 parts by weight of magnesium hydroxide, and from 1 to 10 parts by weight of an organosilicon compound represented by formula (I): ##STR1## wherein R represents an alkyl group containing a methacrylic or acrylic group and Y.sup.1, Y.sup.2, and Y.sup.3 each represents a group selected from the group consisting of an alkyl group, an alkoxyl group, and a halogen group; and an insulated electrical wire obtained by coating the above flame-retardant resin composition on a conductor followed by irradiation.

Abstract: The present invention relates to new stabilized compositions based on halogenated polymer and more specifically on chlorinated polymer. It relates more particularly to stabilized compositions based on chlorinated polymer, which are characterized in that they contain:a) an effective quantity of at least one lead compound or of at least one organostannic compound, andb) an effective quantity of at least one essentially amorphous basic aluminum magnesium carbonate denoted by the formula (I):(MgO).sub.y.Al.sub.2 O.sub.3.(CO.sub.2).sub.x.(H.sub.2 O).sub.z (I).

Abstract: A bearing material mainly comprising plastics and a plastic bearing made thereof. The bearing material is composed of 30 to 98 wt % of glassy carbon and 70 to 2 wt % of plastics, and has persistent, excellent abrasion resistance, sliding properties, and heat resistance.

Abstract: The present invention relates to new stabilized compositions based on halogenated polymers and more specifically on chlorinated polymer. It relates more particularly to stabilized compositions based on chlorinated polymers, which are characterized in that they contain:a) an effective quantity of an organic zinc or cadmium compound,b) an effective quantity of an organic calcium, magnesium, barium or lanthanide compound, andc) an effective quantity of at least one essentially amorphous basic aluminum magnesium carbonate denoted by the formula (I):(MgO).sub.y.Al.sub.2 O.sub.3.(CO.sub.2).sub.x.(H.sub.2 O).sub.z (I).

Abstract: The present invention relates to improved polymeric compositions based on ethylene-vinyl ester and ethylene-alkyl acrylate copolymers which can be crosslinked to provide insulation coatings for wire and cable products. The copolymer compositions contain a hydrated inorganic filler, an alkoxysilane, an antioxidant and a polymeric processing additive. Organic peroxides are preferably employed to facilitate crosslinking. An improved method for providing the improved compositions and electrical conductors coated with the crosslinkable polymeric compositions are also provided by the invention.

Abstract: The present invention relates to improved flame retardant insulation/jacketing compositions for wire and cable products based on ethylene-vinyl ester and ethylene-alkyl acrylate copolymers. The copolymers are formulated with a hydrated inorganic filler, an alkoxysilane, a crosslinking agent, a processing additive and a combination of specific antioxidants, namely, a pentaerythritol betaalkylthiopropionate and a hindered phenol. The formulations stabilized with the pentaerythritol betaalkylthiopropionate/ hindered phenol combination have good heat stability and do not tarnish or discolor the surface of the copper conductor upon steam vulcanization.

Abstract: Disclosed herein are electronic device sealing resin compositions containing 100 parts by weight of a thermoplastic resin mixture composed of 25-60 wt. % of a poly(arylene sulfide) and 40-75 wt. % of an inorganic filler; and 1.5-5 parts by weight of an epoxy-modified silicone oil having an epoxy equivalent of 350-1,000 g/eqiv. Also disclosed are electronic devices sealed using such resin compositions.

Abstract: Moulding materials vulcanizable by means of the action of heat which contain a thiocyanatopropyltrialkoxysilane and a method of their manufacture are disclosed.

Abstract: A fire-retardant thermoplastic compound that can be used as compounded or further enhanced through chemical cross linkage. The compound is manufactured from a composition of a copolymer or terpolymer with a carboxylic acid comonomer and optionally a low modulus polymer and a synthetic hydrocarbon elastomer with or without a graft of ethylenically unsaturated carboxylic acid or anhydride. A fire retardant additive comprising a group I, group II or group III metal oxide hydrate with the proviso that at least 1% by weight of the composition is in the form of an organopolysiloxane. The compound may be used for sheet or wire extrusion and action for injection or compression molding.

Abstract: A method for forming a water-in-oil emulsion of a water-soluble polymer by emulsion polymerization of the corresponding monomer in the presence of an initiator and an emulsifier which is a polysiloxane polyalkylene polyether copolymer. The polymerization of acidic monomer can be carried out without complete neutralization of the monomer beforehand and without adverse effects on the emulsion stability. The water-in-oil product emulsion is easily inverted to a stable oil-in-water emulsion.

Abstract: The wet soak adhesion of acrylic latex sealants is improved by incorporating micelles of polysiloxane oil into the emulsion.

Abstract: A thermoplastic polycarbonate molding composition comprising a polycarbonate resin and a stabilizing agent is disclosed. Containing (i) a polyether polyol and (ii) an aromatic disulfide, the agent imparts to the composition improved resistance to gamma-radiation-induced color change. Articles molded from the composition of the invention are suitable for the preparation of gamma-radiation sterilizable medical equipment.

Abstract: The present invention describes a polymeric support film coated with a primer coating composition and overcoated with a silicone release coating, thereby forming a silicone release film. Silicone release films are well known and serve as temporary supports for an adhesive or tacky surface such as for labels, pressure sensitive tape, etc. The primer coating composition, before dilution with water, comprises from about 25 to 75% by weight of a glycidoxy silane and from about 75 to 25% by weight of a copolyester. The copolyester comprises from about 40 to 98 mol percent isophthalic acid; from about 0 to about 50 mol percent of at least one aliphatic dicarboxylic acid; from about 2 to about 20 mol percent of at least one sulfonate group attached to a dicarboxylic nucleus; and about 100 mol percent of glycol having from about 2 to 11 carbon atoms. Typical glycidoxy silanes that can be employed in the primer coating composition include glycidoxypropyltrimethoxysilane.

Abstract: Flame retardant polyphenylene ether compositions are provided which utilize a silicone fluid treated filler, such as a clay or fumed titanium oxide treated with a polydiorganosiloxane fluid.

Abstract: An aqueous silicone compound-containing coating composition comprises an addition polymer dispersion and at least one silicone compound, the silicone compound forming part of the disperse phase of a dispersion of multi-polymer particles.The silicone compound may be monomeric, oligomeric or polymeric and it may either be added in existing form or be prepared in situ. The provision of reactive groups on either or both of silicone compound as addition polymer gives cross-linking capacity.An unusally wide variety of silicones can be used in the compositions including some not normally associated with coating compositions.

Abstract: There is disclosed a radiation stabilized fabric of propylene polymer or copolymer of propylene which has improved odor characteristics. Radiation stabilization results from adding by weight 0.25 to 2.0 percent of an acetylated hindered amine light stabilizer known in the art as Cyasorb UV-3668 or by adding by weight 0.25 to 2.0 percent of an oligomeric, hindered amine substituted siloxane such as polymethyl propyl 3-oxy [4- (2, 2, 6, 6-tetramethyl) piperdinyl] siloxane.