公开(公告)号：DE59207600D1

公开(公告)日：1997-01-16

申请号：DE59207600

申请日：1992-03-11

Applicant: BASF AG

Inventor： BAUMGARTNER EHRENFRIED DR ,  HOFMANN JUERGEN ,  JUNG RUDOLF ,  MOORS RAINER DR ,  SCHAECH HANSJOERG

IPC: C08L25/12 ,  C08L55/02

Abstract: The invention relates to rubber-modified, high-impact moulding compositions containing, based on the sum of A, B1 and B2, A: from 70 to 98% by weight of a polymer matrix A, formed by free radical-initiated polymerisation of a mixture of from 60 to 90% by weight of styrene and from 10 to 40% by weight of acrylonitrile, and B1: from 1 to 29% by weight of a particulate, first graft polymer B1 distributed in the matrix and comprising a graft base of polybutadien and graft branches of a copolymer of styrene and acrylonitrile, having a mean particle size of from about 100 to 500 nm, B2: from 1 to 29% by weight of a particulate, second graft copolymer B2 distributed in the matrix and comprising a graft base of polybutadien and graft branches of a copolymer of styrene and acrylonitrile having a mean particle size of from 600 to 10000 nm, as obtained by preparing the two graft copolymers in solution and/or bulk and incorporating them into the polymer matrix in a conventional manner. e

公开(公告)号：CA1114984A

公开(公告)日：1981-12-22

申请号：CA273939

申请日：1977-03-14

Applicant: BASF AG

Inventor： WALTER MANFRED ,  STEIN DIETER ,  FAHRBACH GERHARD ,  JUNG RUDOLF ,  ECHTE ADOLF

IPC: C08F291/00 ,  C08F279/02 ,  C08F291/02 ,  C08F253/00

Abstract: The invention is concerned with a process for the manufacture of a styrene polymer modified with rubber to improve its impact strength, by polymerizing styrene in the presence of 1 to 20% by weight, based on styrene, of rubber in at least two stages, wherein, in a first stage, the styrene, which contains the rubber in solution, is prepolymerized at from 50 to 150.degree.C in the presence or absence of inert diluents, while breaking up the disperse soft-component phase which forms during the polymerization by shearing the polymerization mixture until the quantity of styrene converted, based on the starting solution to be polymerized, corresponds to from 3 to 10 times the amount of elastomer constituent of the total amount of rubber employed and the particles of the disperse soft component phase thus formed have a mean diameter of less than 6 .mu.m, and thereafter, in one or more further stages, the polymerization is completed by taking it to the desired conversion with reduced shearing or entirely without shearing, in mass, in solution or in aqueous suspension. The process of the invention is characterized in that the shearing during prepolymerization is carried out in such a way that the particles have a weight-average mean diameter of less than 1 .mu.m and a narrow particle-size distribution, and the disperse soft-component phase contains, during the prepolymerization, from 35 to 65% by weight of free or chemically bonded polystyrene segments being incorporated into the rubber component in a chemically bonded form as a polymer block or a grafted branch, the segments having a number-average molecular weight of at least 30,000. The styrene polymers obtained exhibit not only high impact strength but also improved transparency, and may be used for packaging purposes.

公开(公告)号：DE3460470D1

公开(公告)日：1986-09-18

申请号：DE3460470

申请日：1984-05-14

Applicant: BASF AG

Inventor： HAMBRECHT JUERGEN DR ,  JUNG RUDOLF ,  LINDENSCHMIDT GERHARD DR ,  ECHTE ADOLF DR ,  PRIEBE EDMUND DR

IPC: C08K5/05 ,  C08L25/12 ,  C08L71/02