Abstract: A polyamide molding composition is described, comprising a proportion by weight of from 50 to 99% by weight of at least one transparent homopolyamide and/or copolyamide, a proportion by weight of from 1 to 50% by weight of at least one further polymer whose glass transition temperature is below 80° C., and also a proportion by weight of from 0.001 to 2.0% by weight of at least one photochromic dye. Further dyes and/or additives can optionally be present. The invention moreover encompasses articles manufactured therefrom, a particular example being photochromic ophthalmic lenses.

Abstract: The invention relates to new thermoplastically processible transparent polyamide molding materials based on copolyamides containing diamines and dicarboxylic acids with aromatic cores which exhibit a high index of refraction nD20 over 1.59 and a low density under 1.3 g/cm3. At the same time, a low birefringence, high hardness, and scratchresistance are achieved. The polyamide molding materials are fabricated by means of conventional pressure reactors (autoclaves) according to a modified technique. The granulate that is produced from the inventive molding materials is reshaped by thermoplastic processes like injection molding, particularly in multichamber cavity tools. The invention also relates to the utilization of the inventive molding materials for producing optical lenses.

Abstract: The present invention relates to semiaromatic semi-crystalline thermoplastic polyamide moulding materials having improved processing behavior, increased flowability, improved surface quality and improved mechanical properties, in particular, in conditioned state, the matrix of the polyamide moulding materials according to the present invention comprising at least 3 components: a semi-crystalline copolyamide (A) having the composition 66/6I/6T, a PA prepolymer (B) having the composition 6T/6I/66 or 6T/6I/6 and an amorphous copolyamide (C) having the composition 6I/6T.

Abstract: Transparent polyamide molding materials are provided which are characterized in that they have a melting enthalpy between 0 and 12 J/g and the polyamides are constituted of 100 mole-% of a diamine mixture having 10-70 mole-% of PACM [bis-(4-amino-cyclohexyl)-methane] with less than 50 wt.

Abstract: The present invention relates to semiaromatic semi-crystalline thermoplastic polyamide moulding materials having improved processing behavior, increased flowability, improved surface quality and improved mechanical properties, in particular, in conditioned state, the matrix of the polyamide moulding materials according to the present invention comprising at least 3 components: a semi-crystalline copolyamide (A) having the composition 66/6I/6T, a PA prepolymer (B) having the composition 6T/6I/66 or 6T/6I/6 and an amorphous copolyamide (C) having the composition 6I/6T.

Abstract: Transparent polyamide moulding materials are provided which are characterized in that they have a melting enthalpy between 0 and 12 J/g and the polyamides are constituted of

Abstract: Polyamide mixtures (blends) or alloys having improved transparency, chemical resistance and slight natural color, as well as a process improving the melting capacity and homogeneity of blends of polyamide according to formula (I) and partly crystalline polymers according to formula (II). Transparent polyamide blends are obtained which exhibit improved properties with respect to transparency, color, and chemical resistance, in particular stress cracking resistance against isopropanol, without resulting losses in the mechanical properties. At the same time it was possible to distinctly raise the throughput during extrusion while maintaining optimum transparency.

Abstract: Polyamide mixtures (blends) or alloys having improved transparency, chemical resistance and slight natural color, as well as a process improving the melting capacity and homogeneity of blends of polyamide according to formula (I) and partly crystalline polymers according to formula (II). Transparent polyamide blends are obtained which exhibit improved properties with respect to transparency, color, and chemical resistance, in particular stress cracking resistance against isopropanol, without resulting losses in the mechanical properties. At the same time it was possible to distinctly raise the throughput during extrusion while maintaining optimum transparency.