Abstract: The invention concerns a transparent polyamide alloy, produced by compounding it from 30-98% by weight of a transparent, amorphous, rigid and brittle polyamide A with at least 35 mole % cyclo-aliphatic diamine and a glass transition point of at least 150° C., and 2-70% by weight of a transparent, impact resistant polyamide B with at least 40-80 mole % of at least one long-chain polyamide-forming monomer, with more than 10 carbon atoms and at least 10 mole % terephthalic acid and a glass transition point of under 70° C.

Abstract: The invention concerns a transparent polyamide alloy, produced by compounding it from 30-98% by weight of a transparent, amorphous, rigid and brittle polyamide A with at least 35 mole % cyclo-aliphatic diamine and a glass transition point of at least 150° C., and 2-70% by weight of a transparent, impact resistant polyamide B with at least 40-80 mole % of at least one long-chain polyamide-forming monomer, with more than 10 carbon atoms and at least 10 mole % terephthalic acid and a glass transition point of under 70° C.

Abstract: Colorless, amorphous, transparent copolyamides, their blends or alloys, and molded articles with high alternate bending strengths that can be produced from them. The copolyamides are preferably made of cycloaliphatic diamines combined with aliphatic dicarboxylic acids and small amounts of aromatic dicarboxylic acids. The copolyamides exhibit high strength, high rigidity, high heat distortion, and good solvent resistance.

Abstract: The invention relates to the use of polyamide moulding compounds, their alloys or blends, which contain at least one homopolyamide, which has been obtained from long-chained aliphatic monomer blocks with cycloaliphatic monomer blocks, in order to manufacture moulded members for optical or electro-optical applications.

Abstract: A polyamide composition which is flame-retardant, includes several polyamides; and at least one flame-retarding additive which is at least one alkyl phosphonic acid compound having general formula (I):

Abstract: Colorless, amorphous polyamides, their blends or alloys, and the molded articles with high alternate bending strengths that can be produced from them, are made available; they are preferably made up of cycloaliphatic diamines combined with aliphatic dicarboxylic acids and small amounts of aromatic dicarboxylic acids which show at the same time high strength, high rigidity, high heat distortion, and good solvent resistance.

Abstract: A polyamide composition which is amorphous and transparent, which has reduced flammability, and which has reduced migration of flame-retardant additive so that it is film-free, includes at least one polyamide which contains cycloaliphatic monomer units and which is amorphous and transparent; and a flame-retardant additive which is present in an amount effective to reduced flammability of the polyamide composition, which is dissolved in the at least one polyamide, and which is at least one alkyl phosphonic acid compound having a general formula: ##STR1## wherein R and R' each represent, independent of each other, an alkyl group having from 1 to 4 carbon atoms, and x=0 or 1. An article molded from this composition is transparent, has reduced flammability, and has reduced migration of flame-retardant additive so that it is film-free.

Abstract: An uncoated lens, especially for use as the lens of a fog light or a headlight for an automobile, and having particularly good resistance against the environmental effects which are inherent in this environment, is formed of a colorless, transparent copolyamide having a glass transition temperature of at least a 170.degree. C., blended with a homopolyamide, and wherein the copolyamide is formed from at least one cycloaliphatic diamine with two cyclohexane rings, and at least one aromatic dicarboxylic acid which is predominantly isophthalic acid. The copolyamide may optionally contain up to 20 mol % of a further polyamide forming monomer of at least one lactam or an omega-aminocarboxylic acid. The homopolyamide is preferably one of PA6, PA11, PA12, PA66, PA69, PA610 or PA612. The cycloaliphatic diamine of the copolyamide is preferably bis(3-methyl-4-aminocyclohexyl)-methane.

Abstract: Colorless, amorphous polyamides, preferably their blends or alloys, and the molded articles with high alternate bending strengths that can be produced from them, are made available; they are made up from unbranched long chain monomer units and cycloaliphatic monomer units, and have high strength, high rigidity, high heat distortion, and good solvent resistance.

Abstract: A polyamide composition which is amorphous and transparent, which has reduced flammability, and which has reduced migration of flame-retardant additive so that it is film-free, includes at least one polyamide which contains cycloaliphatic monomer units and which is amorphous and transparent; and a flame-retardant additive which is present in an amount effective to reduced flammability of the polyamide composition, which is dissolved in the at least one polyamide, and which is at least one alkyl phosphonic acid compound having a general formula: ##STR1## wherein R and R' each represent, independent of each other, an alkyl group having from 1 to 4 carbon atoms, and x=0 or 1. An article molded from this composition is transparent, has reduced flammability, and has reduced migration of flame-retardant additive so that it is film-free.

Abstract: Colorless, amorphous polyamide, or blends or alloys thereof, and the molded articles with high alternate bending strengths are made available; they are preferably made up of unbranched aliphatic diamines and cycloaliphatic dicarboxylic acids, and have high strength, high rigidity, high heat distortion, and good solvent resistance.

Abstract: A copolyamide composition and article molded therefrom, the molded article being transparent, being especially rigid, tough and cold impact resistant, having good resistance to solvents, and exhibiting negligible changes in mechanical properties in the conditioned state due to very low water absorption. The copolyamide composition including long-chain monomer building blocks and being comprised of from about 30 to about 96 parts by weight of at least one long-chain monomer which is suitable as a long-chain building block for a polyamide and which has from 9 to 12 carbon atoms; and from about 4 to about 70 parts by weight of precursor monomers for semiaromatic polyamides, which precursor monomers comprise at least one diamine, H.sub.2 N--R--NH.sub.

Abstract: Colorless, amorphous polyamides, their blends or alloys, and the molded articles with high alternate bending strengths that can be produced from them, are made available; they are preferably made up of aliphatic diamines and aliphatic dicarboxylic acids, and at the same time have high strength, high rigidity, high heat distortion, and good solvent resistance.

Abstract: Colorless, transparent copolyamides, made up of monomers based on cycloaliphatic diamines and aromatic dicarboxylic acids and a maximum of 20 mol % of further polyamide-forming aliphatic monomers, which have glass transition temperatures of at least 175.degree. C., their blends and alloys, along with the molded articles that can be produced from them and a process for their preparation are proposed.

Abstract: A multi-layer composite made of at least one copolyamide protective layer, and at least one copolyamide barrier layer, with the protective layer placed such that it is between the barrier layer and a source of moisture. The protective copolyamide layer is composed of a partially aromatic, amorphous copolyamide of a specified composition, and the barrier layer is composed of a partially aromatic barrier copolyamide of a specified composition. This multi-layer composite is especially useful in reusable packaging systems, such as beverage bottles or containers of any kind.

Abstract: 4-component thermoplastic molding compositions which are easily processed on injection molding or extrusion machinery consisting essentially of amorphous copolyamides which can be produced from inexpensive raw materials, inexpensive elastomeric block polyetherpolyamides and block polyetheresterpolyamides as well as commercially available modified copolyolefins and are distinguished by high cold impact resistance, good ductility, variably adjustable rigidity which is independent of the degree of humidity and excellent pigment compatibility as well as by good stress crack resistance, thermal and dimensional stability.