Abstract:
PROBLEM TO BE SOLVED: To provide a method which can quickly and inexpensively evaluate the quality of a number of catalyst samples for catalyzing polymerization. SOLUTION: The method of determining the quality of polymerization catalysts comprises (a) a step of providing catalysts, (b) a step of carrying out the polymerization of a monomer using these catalysts, (c) a step of isolating polymers obtained in step (b), and (d) a step of characterizing the above polymers, and the above method is carried out in an assembly of n vessels in an essentially automated fashion, and the steps (a) to (d) are all carried out in parallel or are all carried out sequentially or some of the steps of (a) to (d) are carried out in parallel and the remainder are carried out sequentially, and n is a natural number of ≥2. COPYRIGHT: (C)2003,JPO
Abstract:
Disclosed is a method for purifying caprolactam made from lysin by treating caprolactam with an acid or an acidic ion exchanger. Also disclosed is the use for producing high-molecular polyamide (polyamide 6).
Abstract:
Process for preparation of high-molecular-weight polyamides, which comprises reacting a polyamide A) at a temperature of from 150 to 350° C. with a compound B) which at this reaction temperature liberates isocyanic acid, where the concentration of the amino end groups in the polyamide A) used is greater than or equal to the concentration of the carboxy end groups.
Abstract:
Thermoplastic molding compositions, comprising A) from 10 to 99% by weight of at least one thermoplastic polyamide, B) from 0.01 to 50% by weight of B1) at least one highly branched or hyperbranched polycarbonate with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, Part 2), or B2) at least one highly branched or hyperbranched polyester of AxBy type, where x is at least 1.1 and y is at least 2.1, or a mixture of these, C) from 0 to 60% by weight of other additives, where the total of the percentages by weight of components A) to C) is 100%.
Abstract:
A process for determining the quality of polymerization catalysts includes: (a) catalyst preparation; (b) polymerization of a monomer with the catalysts; (c) isolation of the polymers obtained under (b); and (d) characterization of the polymers. The process is carried out automatically in an arrangement of n vessels, steps (a) to (d) are all parallel steps, all sequential steps, or some in parallel and the rest in sequence and n at least 2. An Independent claim is included for an automated device for determining catalyst quality comprising: (A) a synthesis module and (B) an analysis module for determination of soluble and insoluble polymer fractions, where A and/or B contain at least 4 vessels and cumulative volume of the A and B vessels does not exceed 100000 ml.
Abstract:
PCT No. PCT/EP98/01553 Sec. 371 Date Sep. 29, 1999 Sec. 102(e) Date Sep. 29, 1999 PCT Filed May 18, 1998 PCT Pub. No. WO98/45352 PCT Pub. Date Oct. 15, 1998Linear, alternating alpha -olefin-CO copolymers are obtainable by polymerization of a monomer mixture comprising a) carbon monoxide, b) 1-alkenes which are functionalized by a covalently bonded crown ether unit or cryptand unit A containing at least 5 heteroatoms selected from the group consisting of nitrogen, oxygen, sulfur and/or selenium in the polyheteroatom framework, and, if desired, c) C2-C24-1-alkenes.
Abstract:
Thermoplastic molding compositions, comprising A) from 10 to 99% by weight of at least one thermoplastic polyamide, B) from 0.01 to 50% by weight of B1) at least one highly branched or hyperbranched polycarbonate with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, Part 2), or B2) at least one highly branched or hyperbranched polyester of AxBy type, where x is at least 1.1 and y is at least 2.1, or a mixture of these, C) from 0 to 60% by weight of other additives, where the total of the percentages by weight of components A) to C) is 100%.
Abstract:
El proceso para la preparacion de poliamidas de peso molecular alto, que comprende hacer reaccionar una poliamida A) a una temperatura de 150 a 350 degree C con un compuesto B) que a esta temperatura de reaccion libera acido isocianico, en donde la concentracion de los grupos finales amino en la poliamida A) usada es mayor que o igual a la concentracion de los grupos finales carboxi.
Abstract:
Thermoplastic molding compositions comprising A) from 10 to 99% by weight of at least one thermoplastic polyamide, B) from 0.1 to 5% by weight of at least one polyethyleneimine homo- or copolymer, C) from 0.05 to 3% by weight of a lubricant, D) from 0.05 to 3% by weight of a copper-containing stabilizer or of a sterically hindered phenol or mixtures thereof, E) from 0 to 60% by weight of further additives, the sum of the percentages by weight of components A) to E) adding up to 100%.