摘要:
A process for continuous production of copolyamides based on a lactam (I), a diamine (II) and a dicarboxylic acid (III) comprises reacting a mixture (IV) comprising a diamine (II), a dicarboxylic acid (III) and water in a first reaction zone at a pressure in the range from 1.3*105 to 2.5*105 Pa in the entry zone of the reaction zone and at a temperature above the melting point of polymer (V) to a conversion, based on the molar amounts of diamine (II) and dicarboxylic acid (III), of at least 80% to form a polymer (V), reacting a mixture (VI) comprising lactam (I) and water in a second reaction zone at a pressure in the range from 5*105 to 40*105 Pa and at a temperature above the melting point of polymer (VII) to a conversion, based on the molar amount of lactam (I), of at least 80% to form a polymer (VII), then reacting polymer (V) and polymer (VII) with each other in a third reaction zone at a pressure in the range from 1*105 to 1.5*105 Pa in the entry zone of the reaction zone at temperatures above the melting point of polymer (VIII) to form a polymer (VIII), said polymer (VIII) having a 95° C. water extractables content, based on lactam (I), diamine (II) and dicarboxylic acid (III), of not more than 10% by weight, and then extracting the polymer (VIII) with water to obtain the copolyamide.
摘要:
Thermoplastic molding compositions compriseA) from 5 to 97.9% by weight of a vinylaromatic polymer with syndiotactic structure,B) from 2 to 90% by weight of a low-viscosity polyamide with a viscosity number VN in the range from 50 to 150 ml/g andC) from 0.1 to 50% by weight of a polar-group-modified polyphenylene ether.
摘要:
Thermoplastic molding materials containA) from 4 to 95% by weight of a semicrystalline, partly aromatic copolyamide composed ofa.sub.1) from 30 to 44 mol % of units which are derived from terephthalic acid,a.sub.2) from 6 to 20 mol % of units which are derived from isophthalic acid,a.sub.3) from 43 to 49.5 mol % of units which are derived from hexamethylenediamine anda.sub.4) from 0.5 to 7 mol % of units which are derived from aliphatic cyclic diamines of 6 to 30 carbon atoms,the molar percentages of components a.sub.1) to a.sub.4) together giving 100%, andB) from 4 to 95% by weight of a polyolefin homo- or copolymer or a mixture thereof,C) from 1 to 20% by weight of a compatibilizer,D) from 0 to 20% by weight of an elastomeric polymer,E) from 0 to 50% by weight of a fibrous or particulate filler andF) from 0 to 30% by weight of conventional additives and processing assistants,the percentages by weight of components A to F together giving 100%.
摘要:
Thermoplastic molding materials contain A) from 1 to 99% by weight of a partly aromatic copolyamide composed of a.sub.1) from 30 to 44 mol % of units which are derived from terephthalic acid, a.sub.2) from 6 to 25 mol % of units which are derived from isophthalic acid, a.sub.3) from 43 to 49.5 mol % of units which are derived from hexamethylenediamine and a.sub.4) from 0.5 to 7 mol % of units which are derived from aliphatic cyclic diamines of 6 to 30 carbon atoms, the molar percentages of components a.sub.1) to a.sub.4) together giving 100%, B) from 1 to 99% by weight of a polyetherimide, C) from 0 to 30% by weight of a polymeric component having OH groups, D) from 0 to 60% by weight of fibrous or particulate fillers or mixtures thereof, E) from 0 to 40% by weight of rubber impact modifiers and F) from 0 to 40% by weight of conventional additives and processing assistants.
摘要:
Partly aromatic semicrystalline thermoplastic polyamide molding compositions contain A) from 40 to 100% by weight of a copolyamide composed of a.sub.1) from 30 to 44 mol % of units which are derived from terephthalic acid, a.sub.2) from 6 to 20 mol % of units which are derived from isophthalic acid, a.sub.3) from 43 to 49.5 mol % of units which are derived from hexamethylenediamine and a.sub.4) from 0.5 to 7 mol % of units which are derived from aliphatic cyclic diamines of 6 to 30 carbon atoms, the molar percentages of components a.sub.1) to a.sub.4) together giving 100%, and B) from 0 to 50% by weight of a fibrous or particulate filler, C) from 0 to 30% by weight of an elastomeric polymer and D) from 0 to 30% by weight of conventional additives and processing assistants, the percentages by weight of components A) to D) together giving 100%.
摘要:
Partly aromatic copolyamides contain as essential componentsA) 40-90% by weight of units derived from terephthalic acid and hexamethylenediamine,B) 0-50% by weight of units derived from .epsilon.-caprolactam andC) 0-60% by weight of units derived from adipic acid and hexamethylenediamine,the components B) and/or C) accounting for a total of not less than 10% by weight of the total units and the copolyamide having a triamine content of less than 0.5% by weight.
摘要:
A process for the continuous production of linear thermoplastic polyesters comprises the following steps:(a) passing a transesterification or esterification product of an aliphatic or aromatic dicarboxylic acid having a molecular weight of
摘要:
In a process for producing polyamides by polymerization of lactams in the presence of metal oxides as heterogeneous catalysts, the metal oxides are used in a form which permits mechanical removal from the reaction mixture and are removed from the reaction mixture in the course of or on completion of the polymerization.
摘要:
A process for continuous extraction of polyamide particles using a recirculating extractant in a vertical extraction column that is divided into two zones comprises treating the polyamide with an aqueous extractant comprising from 40 to 95% by weight of &egr;-caprolactam in a first zone at from 100 to 140° C., and then effecting an aftertreatment with water in a second zone. The caprolactam can then be extracted in a conventional manner. The process provides for economical production of polyamide having a low dimer content.
摘要:
Biodegradable polyesters based onA) 95-99.99 mol % of at least one polyester A containing as monomeric building blocks of an acid component comprisinga.sub.11) 20-95 mol % of at least one aliphatic or cycloaliphatic dicarboxylic acid or its ester-forming derivative anda.sub.12) 5-80 mol % of at least one aromatic dicarboxylic acid or its ester-forming derivative and at least one dihydroxy compound or at least one amino alcohol or their mixtures, andB) 0.01-5 mol % of a mixture comprising mono-, bi-, tri-, tetra- and higher-nuclear isocyanurates or corresponding compounds containing two, three or four functional groups capable of reacting with the end groups of polyester A, or mixtures of the isocyanurates and the corresponding compounds,as well as molding compositions comprising said polyesters, their manufacture and their use in the manufacture of moldings, filsm, fibers and coatings.