摘要:
This invention relates to thermoplastically deformable branched aliphatic polyamides prepared by the hydrolytic polycondensation of lactams in the presence of small quantities of .alpha.-amino-.epsilon.-caprolactam (ACL) and approximately equivalent quantities of polycarboxylic acids (preferably dicarboxylic acids) and to a process for their preparation which is distinguished by considerably reduced polycondensation times without giving rise to cross-linked products. The process optionally in addition employs a solid phase after-condensation in which rapid further condensation takes place to the products with increased melt viscosity which are branched but are still soluble in m-cresol.
摘要:
Polyamide moulding materials which have been impact-modified with diene and/or acrylic rubbers and can be processed by thermoplastic means and contain special diphenols.
摘要:
Thermoplastic polyamides containing phenolic compounds in quantities of from 0.5 to 15%, by weight, based on polyamide are less sensitive to water.
摘要:
Transparent copolyamides obtained by polycondensation of mixtures of positional isomeric diaminodicyclohexyl methanes and optionally further diamines and azelaic acid and optionally isophthalic and/or adipic acid. The copolyamides are valuable moulding compounds for the manufacture of various products such as sheets, films, plates, tubes, rods and containers.
摘要:
A process for the activated anionic polymerization of lactams wherein as activator a fluid partially masked aliphatic araliphatic or cycloaliphatic polyisocyanate being masked with 0.5-0.7 equivalents of lactam per equivalent of NCO groups is used.
摘要:
Biuret-group-containing polyisocyanates based on non-aromatic diisocyanates, possibly mixed with liquid N-alkyl-lactams, as activators for activated anionic polymerization of lactams.
摘要:
Polyamide block copolymers obtained by activated anionic polymerization of lactams having at least 5 ring members in the presence of basic catalysts, polyisocyanates as activators and amino-terminated polyethers, which are characterized in that the amino-terminated polyethers have a functionality of at least 3.0 preferably at least 3.2, and a molecular weight of at least 3500, and the polyisocyanates are aliphatic or cycloaliphatic polyisocyanates.
摘要:
High impact polyamide blends consisting of polyamides having a relative viscosity of at least 3, 5 and of at least one polymer taken from the group comprising aliphatic polyolefines, olefinic copolymers of aliphatic monoolefines, (meth)acrylic acid or (meth)acrylic acid esters, copolymers of styrene, (meth)acrylic acid and (meth)acrylic esters, copolymers of aliphatic dienes and acrylonitrile and high molecular weight organic silicon compounds.