Abstract: Thermoplastic compositions with improved mechanical characteristics, including:a) a graft impact-resistant vinylaromatic copolymer containing a quantity of between 0.1 and 2% by weight of an ethylenically unsaturated compound having a carboxylic group or one of its derivatives in the molecule;b) a polyamide resin andc) a polyolefin.

Abstract: A polyamide resin composition having a multi-phase structure and a process for producing the same are disclosed, the composition comprising:(A) from 60 to 97 parts by weight of a polyamide resin containing at least 2 parts by weight of (A-1) a polyamide resin having a concentration ratio of terminal carboxyl group to terminal amino group of 1.5 or more,(B) from 3 to 40 parts by weight of an ethylene copolymer comprising:(a) from 40 to 90% by weight of an ethylene unit,(b) from 5 to 60% by weight of an .alpha.,.beta.-unsaturated carboxylic acid alkyl ester unit, and(c) from 0.3 to 10% by weight of a maleic anhydride unit, and(C) from 0.

Abstract: A process for producing a graft copolymer comprising melt-blending:(A) 1 to 90 parts by weight of an ethylene copolymer, based on the weight of the graft copolymer, comprising (a) 40 to 99.9% by weight of ethylene units, (b) 0 to 60% by weight of .alpha.,.beta.-unsaturated carboxylic acid alkyl ester units, and (c) 0.1 to 10% by weight of maleic anhydride units;(B) 0.1 to 10 moles of a lactam metal salt compound per mole of the maleic anhydride units (c) of the ethylene copolymer (A); and(C) 10 to 99 parts by weight of a lactam compound, based on the weight of the graft copolymer,which results in a graft copolymer having high impact strength, high flexibility, satisfactory dyeability, and well-balanced physical properties over a wide temperature range.

Abstract: A novel thermoplastic resin composition excellent in heat resistance, mechanical properties and processability is provided which comprises a composition containing (A) a dispersing phase of polyphenylene ether obtained by oxidation polymerization of at least one phenol compound represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 each represents a hydrogen atom, a halogen atom or a substituted or unsubstituted hydrocarbon residue and at least one of them is a hydrogen atom and (B) a crystalline thermoplastic resin matrix phase and (C) a mutual compatibilizer compatible with (A) and/or (B), an average particle diameter in said dispersing phase having of 0.01-10.mu..

Abstract: Thermoplastic molding compositions including a semicrystalline polyamide a) and an amorphous copolyamide b), the latter containing dimerized fatty acid as one monomer building block. Optionally, a compatibility agent and other additives are also included.The molding compounds having high stiffness up to at least 100.degree. C. are produced by melt-mixing components a) and b), and optionally a compatibilizer, and are used for making molded parts which are outstanding in their thermal properties, high solvent resistance, and resistance to stress corrosion.

Abstract: Polyoxymethylene compositions having 5-15 wt. thermoplastic polyurethane; where the polyurethane has a soft segment glass transition of lower than 0.degree. C., the polyoxymethylene has a molecular weight of 20,000-100,000, and the polyurethane is dispersed in the polyoxymethylene as discrete particles show extraordinary impact resistance as measured by Gardner impact.

Abstract: Thermoplastic compositions of an aromatic polyimide and an aromatic polyethersulfone. The compositions have high upper critical use temperatures, high moduli, high tensile strengths, and high impact strengths. Some of the compositions are miscible blends, which additionally possess significant advantages due to their ease of processing. The miscible blends can be processed into amorphous single phase compositions or phase-separated compositions, depending on the processing conditions. Preferred compositions are blends of VICTREX polyethersulfone with either of the polyimides XU-218 or PI-2080.

Abstract: The present invention teaches polyetherimide blends which are comprised of at least one polyetherimide resin and at least one polyester resin derived from a cyclohexanedimethanol and a carbocylic acid. These blends can be utilized in applications requiring improved impact strengths compared to unmodified polyetherimide compositions.

Abstract: A polyamide composition comprising an aromatic ring-containing polyamide resin and a specific amount of an aliphatic polyester. The composition has improved molding properties, such as mold release characteristics, and exhibits excellent physical properties, such as stiffness, which will not be lowered upon contact with moisture. The polyamide composition may contain additional components which have been used to improve properties other than molding properties, such as Izod impact strength and hinge effect properties, so that the effects of the components are also exerted in the present composition without sacrificing the main effect aimed at by the present invention, i.e., excellent molding properties. Therefore, the polyamide composition of the present invention is useful as a molding material in various fields, e.g., automobile, electrical and electronic industries.

Abstract: It is frequently desirable to increase the modulus of rubbers which are utilized in a wide variety of applications. This invention discloses a technique for increasing the modulus of rubbers. By utilizing this technique, high modulus rubber compositions can be attained without sacrificing other properties, such as elongation and hysteresis. This invention more specifically relates to a process for preparing a high modulus rubber composition which comprises: (1) polymerizing at least one N-carboxyl-.alpha.-amino acid anhydride in a polymer cement of a rubbery elastomer under conditions which result in the formation of a rubber cement having the poly(.alpha.-amino acid) dispersed therein; and (2) recovering the high modulus rubber composition from the rubber cement. The high modulus rubber compositions made by this technique are comprised of at least one rubbery elastomer and at least one poly(.alpha.-amino acid).

Abstract: A fiber-reinforced rubber composition capable of providing a vulcanizate having an excellent strength and modulus and a production process thereof. This fiber-reinforced rubber composition includes fine short fibers of thermoplastic polymer having ##STR1## groups buried in vulcanizable rubber. The vulcanizable rubber and the thermoplastic polymer are grafted to each other through a resol type alkylphenol formaldehyde resin precondensate or a novolak type phenol formaldehyde resin precondensate at an interface of the fiber. The ratio of the fiber to the vulcanizable rubber (A) 1 to 70 parts by weight based on 100 parts by weight of the rubber in the case of the resol type alkylphenol formaldehyde resin precondensate or (B) 1 to 100 parts by weight based on 100 parts by weight of the rubber in the case of the novolak type phenol formaldehyde resin precondensate.

Abstract: Thermoplastic blends of a polyamide having low amine end-group concentration and a polymer containing ester or carbonate linkages. The blends are useful in providing molded parts having improved properties such as improved impact strength.

Abstract: Disclosed is a novel two-step reaction method for preparing block copolyether-ester-amides. In the first step, caprolactam or other lactam is reacted with a polyether polyol in the presence of a catalyst to form an amino-terminated prepolymer with both a polyamide hard segment and a polyether soft segment. In the second step, the prepolymer is reacted with a dicarboxylic acid as a chain extender to form high molecular weight block copolyether-ester-amides.The block copolyether-ester-amides prepared by this method are transparent, easily moldable by conventional processing methods such as extrusion and injection molding, and exhibit excellent mechanical properties.

Abstract: Blended polymer compositions are described which comprise(I) from about 1% to about 97% by weight of at least one alpha-olefin polymer;(II) from about 1% to about 97% by weight of at least one polyamide;(III) from about 1% to about 97% by weight of at least one polymer of a vinyl aromatic hydrocarbon; and(IV) an effective amount of a mixture of two or more compatibilizing agents selected from the group consisting of(IVa) at least one selectively hydrogenated block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene;(IVb) at least one selectively hydrogenated block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene to which has been grafted, an alpha,beta-olefinically unsaturated monocarboxylic or dicarboxylic acid reagent; and(IVc) at least one terpolymer of an alpha-olefin, at least one acrylic ester, and an alpha,beta-olefinically unsaturated dicarboxylic acid reagent, or a glycidyl acrylate.The polymer blends of the present invention have improved impact-resistance.

Abstract: This invention relates to molding compositions comprising:(a) from about 15 to about 85 percent by weight of a polyamide having an inherent viscosity of about 0.6 to about 2.5 dl/g,(b) from about 15 to about 85 percent by weight of a copolyester, having an inherent viscosity of about 0.5 to about 1.0 dl/g, comprising repeat units of terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol, and(c) from about 5 to about 30 percent by weight of a combination of at least two impact modifiers are selected from the group consisting of maleated and unmaleated ethylene-propylene rubbers wherein at least one said impact modifier is maleated.

Abstract: Tough, high melt flow, low molecular weight polyamide compositions containing toughening polymers are obtained by blending conventional polyamides with the toughening polymer and then mixing the blend with very low molecular weight polyamides which are capable of reacting with the conventional polyamide by transamidation.

Abstract: Vulcanized blends of poly(etherimide ester) copolymer or poly(ether-ester-amide) block copolymer with epoxy functionalized EPDM rubber are provided having enhanced elastic recovery %. Vulcanization of compatibilized blends of the poly(etherimide ester) copolymers or poly(ether-ester-amide) block copolymers with epoxy functionalized EPDM rubber can be effected with crosslinking agents, such as, organic diamines.

Abstract: In the case where a polyamide is blended with a specific partially crosslinked graft-modified polyolefin elastomer obtained by dynamically heat-treating a blend of a peroxide-crosslinking olefin copolymer rubber and an olefinic plastic with an unsaturated carboxylic acid or derivative thereof, an unsaturated epoxy monomer or an unsaturated hydroxy monomer in the presence of an organic peroxide, if the graft-modified polyolefin plastomer occupies a major portion, a composition excellent in the oil resistance, the mechanical strength and the resistance against heat aging is obtained and if the polyamide occupies a major portion, a composition excellent in the impact resistance, the rigidity and the tensile strength is obtained.

Abstract: An agent is provided which renders compatible at least two incompatible thermoplastic polymers. The agent contains one di- or trisequenced copolymer comprising at least one N-vinyl pyrrolidone or methyl (meth) acrylate telomer and one mono- or difunctional oligomer selected from the group consisting of an ethylenically unsaturated polymerizable monomer, or a polycondensable monomer, or a lactam. The agent is prepared by condensation of the telomer with the oligomer and is used in the preparation of alloys of incompatible thermoplastic polymers.

Abstract: One-component, moisture-hardening sealants and adhesives contain telechelic isocyanate prepolymers obtainable by reacting diisocyanates and/or polyisocyanates in stoichiometric excess with polyester polyols, polyether polyols and hydroxy-functional (meth) acrylate prepolymers, as well as conventional plasticizers, the polyester polyols having branches, more particularly formed by alkyl radicals containing no functional groups. The polyester polyols can either be obtained by reacting corresponding branched diols and/or dicarboxylic acids or by subsequent grafting of side groups on to straight-chain polyester polyols. The sealants and adhesives are transparent or translucent, have a high ageing stability and excellent mechanical characteristics.