Abstract: A polystyrenic resin composition comprising (A) a styrenic polymer composition containing (a) 1 to 99% by weight of a polystyrenic resin having the syndiotactic configuration, (b) 1 to 99% by weight of a polyamide resin, (c) 0.1 to 10% by weight of a compatibilizer which is compatible with component (a) and has a polar group reactive with component (b), and (d) 0 to 50% by weight of a rubbery elastomer and/or a modified rubbery elastomer, (B) specific amounts of a copper compound and an iodine compound, and optionally, specific amounts of (C) a phenolic compound, (D) N,N'-hexamethylenebis(3,5-di-t-butyl-4-hydroxy-hydrocinnamide), (E) an ester of thiodipropionic acid or a derivative thereof, (F) a copper inhibitor, and (G) inorganic filler; and a molded article prepared from the polystyrenic resin composition.

Abstract: An additive for masticating natural rubber comprising at least one compound selected from the group consisting of benzoic acids, naphthoic acids, dicarboxylic acids and compounds represented by Formula (IV): ##STR1## wherein m and n each represent an integer of 1 to 3; p represents an integer of 1 to 4; m+n+p=6; X is O, NR.sup.8 or (R.sup.9 O).sub.q ; R.sup.6 is a C.sub.1 .about.C.sub.24 alkyl, a C.sub.2 .about.C.sub.24 alkenyl, or a C.sub.6 .about.C.sub.24 aryl group; and R.sup.7 is H, OH, an alkyl, alkenyl or aryl group; R.sup.8 is H or a C.sub.1 .about.C.sub.24 alkyl group; R.sup.9 is a C.sub.1 .about.C.sub.4 alkyl group; q is an integer of 1 to 5, a mastication method and a natural rubber composition each of which uses the additive, and a pneumatic tire using the natural rubber composition.

Abstract: The invention relates to compound antifoams comprising alkoxylated partial esters--using from 3 to 60 mol of propylene oxide with or without from 1 to 10 mol of styrene oxide and/or from 1 to 10 mol of butylene oxide--of oligoglycerols, obtainable by condensation of 2 to 20 glycerol molecules, with C.sub.8 to C.sub.22 fatty acids and inorganic or organic solids for defoaming polymer dispersions and aqueous coating systems.

Abstract: Polymer composition made by combining a polyketone polymer and a monophenolic compound of the general formula: ##STR1## R.sup.1 and R.sup.2, independently, are hydrogen or alkyl groups with 1-6 carbon atoms,Y is an organic group from 3 up to 15 carbon atoms.

Abstract: Disclosed is a polyalkylene naphthalate film, preferably the homopolymer of naphthalene-2,6-dicarboxylic acid and ethylene glycol (PEN), comprising a UV absorbing compound of general formula Q--CO--CO--X (explained in the description) for quenching of the UV fluorescence at 429 nm. The polymeric film is preferably used as support for a photographic material, preferably a colour negative or colour reversal photographic material.

Abstract: In order to prevent a thermoplastic resin possessing an unsaturated nitrile unit from discoloration, the thermoplastic resin prepared by copolymerizing at least an unsaturated nitrile compound as a polymerizing component in the presence or absence of a rubbery polymer is blended with 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate. The resulting composition shows little discoloration during the production and processing stages.

Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings.

Abstract: Highly uniform microporous foam suitable for medical applications and methods for preparing these foams. The highly uniform microporous foams are of controlled pore size that may be utilized in a variety of applications. In preparing the foams, an organic crystalline polymer is melted and combined with a selected solid crystalline fugitive compound to produce a substantially isotropic solution. The solution is cooled under controlled conditions, which foster solid-solid phase separation by the simultaneous crystallization of the fugitive compound and the polymer, to produce a foam precursor containing the solidified fugitive compound dispersed through a matrix of the organic polymer. Crystals of fugitive compound are then removed by solvent extraction and/or sublimation, or like process to produce microcellular foams having a continuous, open-cell structure.

Abstract: The present invention provides stain-inhibiting protection to glass surfaces of stacked glass sheets utilizing one or more water-soluble organic acid dispersed in a matrix of a water-soluble polymer or mixtures thereof. Suitable water-soluble organic acids may be found in the groups consisting of hydroxy mono, di, tri and tetra carboxylic acids. In the preferred form of the invention, components such as humectants, bactericidal and bacteriostatic agents and surface active (wetting) agents may be included in the composition.

Abstract: There is disclosed a styrenic resin composition which comprises 70 to 99.9% by weight of an (A) styrenic polymer having a high degree of syndiotactic configuration and 0.1 to 30% by weight of a (B) organic compound having a --NH-- group and a molecular weight of less than 10,000.According to the present invention, there is obtained a styrenic resin composition having a syndiotactic configuration which is improved in electrical insulating properties, especially in withstand voltage against direct current.

Abstract: The present invention relates to rubber compositions containing o-salicylsalicyclic acid of the formula: ##STR1##

Abstract: A thermoplastic synthetic resin, especially high-density polyethylene, has its diffusion coefficient especially for hydrocarbons, reduced by the addition of 2 to 8% by weight of an additive consisting essentially of at least one phenoxy resin, and at least one further component selected from the group which consists of at least one radical forming agent and at least one graft coploymerization catalyst, and optional quantities of an antioxidant selected from the group which consists of at least one phenolic antioxidant, at least one phosphitic antioxidant and mixtures thereof, at least one organosilane ester, at least one UV stabilizer, at least one antistatic composition, and polypropylene.

Abstract: Disclosed are coatings and materials that resist bacterial colonization and encrustation for use in medical devices and urological applications. The coating includes acidic chelating components, reactively bound to a hydrophilic polyurethane prepolymer along with noble metal combinations or antibacterials. The acidic and noble metal combinations can also be incorporated as additives during plastic molding of medical devices. A continuous antibacterial surfaces are provided by such coatings and materials.

Abstract: A polyacetal resin composition comprises a polyacetal resin, (A) a light stabilizer selected from the group consisting of a benzotriazole compound, a benzophenone compound, an aromatic benzoate compound, a cyanoacrylate compound, and an anilide oxalate compound and (B) an aliphatic acid ester. It is improved in stability to weathing.

Abstract: An antigel agent composed of four types of antioxidants that allows polyamides to be blended with acrylonitrile/butadiene polymers with minimum generation of gels and yields a blend which can be extruded or sheeted to give a uniformed shaped product, for example, sheets and molded articles and is essentially free of plugging the screens of extruder used to extrude hose tube or sheet.

Abstract: A stabilizing system for stabilizing polymeric materials against ultraviolet light and thermooxidative deterioration is provided in which the stabilizing system is in pellet form. The pellet is formed from a substantially dry homogeneous mixture of at least one stabilizer and an agent which will prevent melting of the stabilizer. The stabilizer compound makes up about 50% to about 98% by weight of the mixture. The stabilizers are antioxidants (such as phosphites and hindered phenols) or hindered amine UV light stabilizers, or combinations thereof. The melt preventing agent may be a compound derived from a fatty acid or a fatty alcohol, or a fatty acid or a fatty alcohol, or a combination of fatty acids or fatty alcohols which makes up about 3%-10% of the homogeneous mixture. The fatty acids, fatty alcohols, and the compounds derived therefrom preferably have a low melting point in the range of 50.degree.-100.degree. C. and preferably between 50.degree. C. and about 80.degree. C.

Abstract: Process for obtaining granular forms, from mixtures of powders of two or more additives for organic polymers, including extruding the mixture at a temperature of between about the melting point of the component with the lowest melting point and 140.degree. C., with the condition that, when the mixture consists of two additives, these are not tetrakis ?3-(3,5-di-t-butyl-4-hydroxyphenyl) propionyloxymethyl!methane, either in an amorphous or crystalline form, and an antiacid.

Abstract: A mixture of the compounds identified in the title, their pure isomers and alkane-bridged derivatives are particularly effective in stabilizing polymer compositions, particularly polyolefin compositions.

Abstract: The use of 3-arylacrylic esters I ##STR1## where Ar is an aryl radical which can additionally carry substituents,R.sup.1 is the residue of an n-hydric aliphatic polyol having up to 20 carbon atoms, where the carbon chain can be interrupted by up to 9 non-adjacent oxygen atoms, or of an n-hydric cyclo-aliphatic polyol having 5 to 20 carbon atoms in which ring carbon atoms can also be replaced by non-adjacent oxygen atoms,R.sup.2 and R.sup.3 are hydrogen or C.sub.1 --C.sub.4 -alkyl, andn is a number from l to 10,as stabilizers, in particular against the action of light, for non-living organic material.

Abstract: Recycled plastics, predominandy thermoplastics, from domestic, commercial and industrial waste can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and a metal salt of a fatty acid.

Abstract: A polymeric composition in which (D) a phenol antioxidant having a specific skeleton 5-t-butyl-3-methyl-4-hydroxyphenyl, (C) a hindered amine photostabilizer having a molecular weight of not less than 400, and (D) a specific phosphorus compound dihydrooxaphosphaphenanthrene are included in (A) a polymeric compound. This polymeric composition is excellent in thermal oxidation degradation resistance and discoloration of coloring resistance in contacting with a combustion gas or the like.

Abstract: A process is described for the preparation of finely divided polymer powders by polymerizing water-soluble monomers in the aqueous phase of a water-in-oil emulsion in the presence of water-in-oil emulsifiers and polymerization initiators, removing the water from the resultant water-in-oil polymer suspension by azeotropic distillation, and isolating the suspended, finely divided polymer powder, either the polymerization of the water-soluble monomers being carried out in the presence of from 0.1 to 10% by weight, based on the monomers employed in the polymerization, of protective colloids, or the protective colloids being added to the water-in-oil polymer suspension after the polymerization is complete. The polymerization is preferably carried out in the presence of surfactant. The finely divided pulverulent polymers are used as flocculants or thickeners for aqueous systems.

Abstract: A method of making flame retarded polyurethanes by including a bromobenzoate compound in the polyurethane mixture. Also disclosed is a method of making flame retarded polyvinyl chlorides, unsaturated polyesters and epoxy resins by incorporating a bromobenzoate compound into the polymer system. The bromobenzoate compounds of the invention may also be used as plasticizers for PVC and rubber.

Abstract: The present invention relates to a silica reinforced rubber composition and pneumatic tires having treads comprised of the silica reinforced rubber compositions. The silica reinforced rubber composition comprises an elastomer, silica, optionally carbon black and a silica coupler of the formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 individually represent hydrogen or an alkyl of 1 to 6 carbon atoms; X represents oxygen or sulfur; and Z represents a hydroxyalkyl group of 2 to 7 carbon atoms.

Abstract: The present invention comprises dipropylene glycol dibenzoate and diethylene glycol dibenzoate, the improvement comprising the addition of dipropylene glycol monobenzoate or diethylene glycol monobenzoate, whereby the plasticizer is resistant to fungal growth.

Abstract: Products are described which can be obtained by reacting components a), b) and c), where component a) is a compound of the formula I or a mixture of compounds of the formula I, component b) is a compound of the formula II or a mixture of compounds of the formula II and component c) is a compound of the formula III or a mixture of compounds of the formula III, ##STR1## in which the general symbols are as defined in claim 1, the compound of the formula I being, for example, pentaerythritol, thiodiethylene glycol, 1,4-butanediol, 1,4-propanediol, diethylene glycol, triethylene glycol, diethanolamine or glycerol, the compound of the formula II being, for example, sunflower oil or coconut fat, and the compound of the formula III being, for example, methyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate. The abovementioned products can be used as liquid antioxidants in polymers and lubricants.

Abstract: Products are described which can be obtained by reacting components a), b), c) and d), where component a) is a compound of the formula I or a mixture of compounds of the formula I, component b) is a compound of the formula II or a mixture of compounds of the formula II, component c) is a compound of the formula III or a mixture of compounds of the formula III and component d) is a compound of the formula IV or a mixture of compounds of the formula IV, ##STR1## in which the general symbols are as defined in claim 1, the compound of the formula I being, for example, pentaerythritol, thiodiethylene glycol, 1,4-butanediol, 1,2-propanediol, diethylene glycol, triethylene glycol, diethanolamine or glycerol, the compound of the formula II being, for example, sunflower oil or coconut fat, the compound of the formula III being, for example, methyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate and the compound of the formula IV, being for example, sulfur or diisopropyl dithiophosphate.

Abstract: Recycled plastics, predominanty thermoplastics, from domestic, commercial and industrial waste can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and a metal salt of a fatty acid.

Abstract: The invention relates to mixtures of polycarbonate, phenolically hydroxyfunctional branched dimeric fatty acid polyesters and optionally graft polymer, which are distinguished by a good low-temperature strength and stress cracking resistance and good mould release properties.

Abstract: The ultraviolet- and infrared-ray absorbing polymer composition contains 0.01-1 part by weight of an organic ultraviolet-ray absorbent and 0.001-2 parts by weight of an organic infrared-ray absorbent onto 100 parts by weight of a polycarbonate resin which implies 10-100% by weight of copolyestercarbonate, manufactured by heat-molding process at 210.degree.-245.degree. C. from a mixture of those components. This polymer composition is manufactured easily by an ordinary screw extruder or injection molding machine without strict control of heat-molding temperature, at a high non-defective ratio, said product having a stable effect in absorbing ultraviolet rays and infrared rays, while allowing transmittance of visible radiation rays, thus making it suitable for a wide variety of uses.

Abstract: A phosph(on)ite free antioxidant system based on an .alpha.-tocopherol formulation and a compound selected from tetrakis[methylene(3,5-di-tert.-4-hydroxyhydrocinnamate]methane or octadecyl 3,5-di-tert.-4-hydroxyhydrocinnamate is disclosed. This system can replace phenolic/phosphite combinations as the primary system, or simply replace the phosphite portion, to achieve certain optimum performance requirements. In either case, the problems associated with phosph(on)ites can be eliminated or minimized.

Abstract: Liquid polyester plasticizers, having a hydroxyl value of at least 25, are incorporated into vinyl resins, such as PVC, which are formed into gaskets for use on appliances made from textured coil stock, especially refrigerators or freezers. These plasticizers have no detrimental effect on the relatively soft surface coatings on such appliances.

Abstract: Useful stabilizer combinations and propylene polymer compositions stabilized therewith having improved resistance to discoloration upon processing are provided. The stabilizer combinations of the invention are comprised of a mixture of calcium salts of stearic acid and lactic acid and a tocopherol-containing mixture consisting essentially of .alpha.-tocopherol, glycerin, polyethylene glycol having an average molecular weight of about 300 and glycerol monocaprylate. Propylene homopolymers and random, block and impact copolymers of propylene are stabilized in accordance with the invention.

Abstract: The present invention relates to a container or bag for garbage which repels animals such as cats, dogs, rats, and crows. The article is made from a composition comprising a polyolefin having 10 to 7000 ppm by weight of a compound selected from methyl salicylate, ethyl salicylate, propyl salicylate, n-butyl salicylate, iso-butyl salicylate, iso-amyl salicylate, and menthol.

Abstract: An adhesive composition which undergoes a change from colored to colorless upon application to a substrate. The composition comprises a shape-giving base, the shape-giving base comprising a gel of a gel-forming salt of an aliphatic carboxylic acid having from about 8 to 36 carbon atoms with a cation selected from the group consisting of alkali metals, ammonia and lower alkylamines in an aqueous liquid selected from the group consisting of water and mixtures of water with water-miscible organic solvents. In a preferred embodiment, the aforementioned gel-forming salt of an aliphatic carboxylic acid is sodium stearate. The composition additionally includes an adhesive component selected from the group consisting of water-soluble and water dispersible adhesives. In a preferred embodiment, the adhesive component is polyvinylpyrrolidone.

Abstract: Plasticizers are homogeneously incorporated into finely divided solid polyamides by mechanically agitating a mixture of plasticizers and polyamides at temperatures of at least 80.degree. C. while the polyamide remains in the finely divided solid phase.

Abstract: A high degree of stabilization of polyvinyl chloride is achieved by using a perchlorate, a terminal epoxide compound and an antioxidant.

Abstract: The novel compounds of the formula I ##STR1## in which n is an integer from the range from 4 to 8 and m is an integer from the range from 1 to 4,A is the aliphatic, aromatic, araliphatic or heterocyclic radical of a monobasic to tetrabasic carboxylic acid, andR.sup.1 and R.sup.1', independently of one another, are C.sub.1 -C.sub.24 alkyl or C.sub.5 -C.sub.8 cycloalkyl, are suitable for stabilizing organic material against thermal, oxidative or actinic degradation.

Abstract: A polyolefin composition is provided which is resistant to gas fading upon exposure to atmospheric pollutants. The compositions containing a stabilizing amount of a phosphite of the formula ##STR1## wherein Y.sup.1 is an alkyl, preferably t-butyl, and Y.sup.2 is t-butyl or sec-butyl. Fibers and films made from the composition exhibit improved fade resistance compared to fibers and films made from polyolefins stabilized with various other commercially available phosphite. The compositions also contain an additive selected from hindered phenolic antioxidants and hindered amine light stabilizers.

Abstract: Improved thermoplastic compositions adopted for easy conversion, e.g., by injection molding or extrusion techniques, into useful shaped articles having high flexibility, and good tear resistance and elasticity, include a polyetheramide, advantageously a polyetheresteramide, and a styrene/diene copolymer, e.g., a copolymer of styrene with butadiene or isoprene, notably a linear or branched chain styrene/butadiene/styrene or styrene/isoprene/styrene copolymer.

Abstract: Molding materials having stress cracking resistance containingA) from 49 to 99% by weight of a polymer obtainable by polymerizing a C.sub.1 -C.sub.20 -alkyl ester of methacrylic or acrylic acid or a mixture of said esters,B) from 0.95 to 50% by weight of a polymer obtainable by polymerizing a monomer mixture comprisingb.sub.1) from 75 to 82% by weight of a vinyl aromatic monomer andb.sub.2) from 18 to 25% by weight of acrylonitrile or methacrylonitrile or a mixture thereof, andC) from 0.05 to 1% by weight of a mixture containingc.sub.1) a triaryl phosphite of the formula I ##STR1## c.sub.2) an amine of the formula II ##STR2## where n is from 2 to 10, c.sub.3) a benzotriazole of the formula III ##STR3## and C.sub.4) a phenol.

Abstract: The invention relates to an optically non-linear active waveguiding material comprising an optically transparent polymer and a donor group and acceptor group-containing triphenylcarbinol as a dopant. Said dopants have a high hyperpolarizability and have a charge-transfer absorption band which is about the same as that of their corresponding compounds having only one donor-.pi.-acceptor unit. The triphenylcarbinols were found to display good solubility in polymers. Nitro-functionalized triphenylcarbinols are preferred because of their charge-transfer absorption band at a low wavelength (.lambda..sub.max at about 290 nm). Aldehyde-functionalized calix(4)arenes were also found to have this low wavelength charge-transfer absorption band (.lambda..sub.max at about 270 nm). Triphenyls comprising stilbene donor-.pi.-acceptor units are preferred because of their high hyperpolarizability.

Abstract: Products are described which can be obtained by reacting components a), b) and c), where component a) is a compound of the formula I or a mixture of compounds of the formula I, component b) is a compound of the formula II or a mixture of compounds of the formula II and component c) is a compound of the formula III or a mixture of compounds of the formula III, ##STR1## in which the general symbols are as defined in claim 1, the compound of the formula I being, for example, pentaerythritol, thiodiethylene glycol, 1,4-butanediol, 1,4-propanediol, diethylene glycol, triethylene glycol, diethanolamine or glycerol, the compound of the formula II being, for example, sunflower oil or coconut fat, and the compound of the formula III being, for example, methyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate. The abovementioned products can be used as liquid antioxidants in polymers and lubricants.

Abstract: Compositions comprising an organic material which is sensitive to thermal, oxidative and/or actinic degradation and at least one compound of the formula I ##STR1## in which Z.sub.1 and Z.sub.2 independently of one another are C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.8 cycloalkyl, phenyl, phenyl-C.sub.1 -C.sub.4 alkyl or (C.sub.1 -C.sub.4 alkyl)phenyl andp is a number from 4 to 18,with the proviso that Z.sub.1 and Z.sub.2 are not simultaneously tertiary alkyl radicals. Some of the compounds of the formula I are novel.The compounds of the formula I can also be employed as stabilizers as a mixture with compounds of the formula VI and/or of the formula VII ##STR2## in which n and the radicals R.sup.1, R .sup.1 ' and A are as defined in claims 14 and 15.

Abstract: A process is described for stabilizing polyethylene grit in which a sterically hindered phenol and an ester of phosphorous or of hypophosphorous acid are added to said grit, wherein the sterically hindered phenol in melt form and the ester of phosphorous or of hypophosphorous acid are made available to the polyethylene grit within a ground polyolefin matrix in which the ester is incorporated, the polyolefin matrix being compatible with the polyethylene grit.

Abstract: The invention relates to improved thermoplastic compositions composed of one or more thermoplastics (component A), and a stabilized MBS core shell graft copolymer (component B) formed from a rubber-elastic core based on polybutadiene, and a hard graft shell.The stabilized MBS core shell graft copolymer (component B) contains a special stabilization formulation of at least one hindered phenol, a phosphite, an organic sulfide, and optionally a pH buffer system. The stabilized MBS core shell graft copolymer improves the impact strength and heat aging properties of thermoplastic compositions and polyacetal compositions.The shaped articles produced from the improved thermoplastic compositions are particularly distinguished by an excellent high-temperature impact strength and a good heat aging performance.

Abstract: A polyoxymethylene composition which is remarkably improved in heat stability, little stains molds even in long-term continuous molding and little generates formaldehydic stench in molding, and which comprises a polyoxymethylene and, added thereto, 0.01 to 5% by weight of an antioxidant and 0.01 to 10% by weight of a melamine-formaldehyde polycondensate, each based on the polyoxymethylene, characterized in that the melamine-formaldehyde polycondensate used is one which is prepared mainly from melamine and formaldehyde and contains 2.0 to 10 moles of the melamine units on the average per mol of the melamine-formaldehyde polycondensate, wherein the mean mole number of hydrogen bonded to 3 moles of the amino groups contained in 1 mole of melamine is 3.0 moles or above.

Abstract: A connector comprising a housing comprising a polybutylene terephthalate resin composition comprising:(A) 100 parts by weight of a polybutylene terephthalate resin having an intrinsic viscosity of from 1.10 to 1.30 dl/g as measured in o-chlorophenol at 25.degree. C.;(B) from 40 to 60 parts by weight of a copolymer of acrylonitrile and styrene;(C) from 10 to 20 parts by weight of a graft copolymer comprising:(C1) from 65 to 75% by weight of copolymer comprising from 75 to 85% by weight of ethylene and from 25 to 15% by weight of glycidyl methacrylate, and(C2) from 25 to 35% by weight of a copolymer of acrylonitrile and styrene;(D) from 0.05 to 0.5 part by weight of a hindered phenol compound represented by formula (I): ##STR1## (E) from 0.05 to 0.5 part by weight of a thioether compound represented by the following formula (II):(R.sub.3 SR.sub.4 COOCH.sub.2).sub.m C(CH.sub.2 OH).sub.4-m (II)wherein the variables are defined in the specification.

Abstract: The invention relates to an optically non-linear active waveguiding material comprising an optically transparent polymer and a non-linear optical dopant comprising more than one donor-.pi.-acceptor unit.Dopants comprising more than one donor-.pi.-acceptor unit, especially dopants in which the donor-.pi.-acceptor units are positioned in a cyclic group, have a high hyperpolarizability and a charge-transfer absorption band wavelength which is about the same as that of dopants with only one donor-.pi.-acceptor unit.Especially suitable dopants for use are calix(4)arenes. These are provided with acceptor groups at the upper rim and with donor groups at the lower rim. In addition to having excellent hyperpolarizability, these compounds were found to be readily soluble in host polymers, such as polymethylene (meth) acrylate and polystyrene.

Abstract: A polyacetal resin composition which comprises (A) 100 parts by weight of a polyacetal resin, (B) 0.1 to 1.5 parts by weight of at least one kind selected from the group of light stabilizers represented by the following formula (1) ##STR1## wherein two X's are the same or different and each denotes a hydrogen atom or a methyl group, (C) 0.1 to 1.5 parts by weight of an ultraviolet light absorber, (D) 0.1 to 3 parts by weight of polyethylene, (E) 0.1 to 5 parts by weight of polyethylene glycol, and (F) 0.1 to 10 parts by weight of a polymer of a methacrylate ester. This polyacetal resin composition is excellent in weather resistance and molding processability.