公开(公告)号：DE4030512A1

公开(公告)日：1992-04-02

申请号：DE4030512

申请日：1990-09-27

Applicant: BASF AG

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

IPC: C08F279/02 ,  C08F2/02 ,  C08F2/04 ,  C08F2/06 ,  C08F4/32 ,  C08F279/00 ,  C08F279/04

Abstract: A process for the continuous preparation of high-impact polystyrene-acrylonitrile (ABS) by the free radical-initiated polymerisation of a mixture of from 60 to 90% by weight of at least one vinyl aromatic monomer and from 10 to 40% by weight of at least one further ethylenically unsaturated monomer in the presence of from 5 to 30% by weight, based on the sum of the monomers, of polybutadiene having a solution viscosity (5% strength by weight in styrene at 25 DEG C) of from 25 to 95 mPa.s and optionally in a solvent, in at least three series-connected reactors operating essentially with no back-mixing, at reaction temperatures of from 50 to 170 DEG C, phase inversion occurring in one of the reactors, the polymerisation being carried out as far as phase inversion at a temperature of 90 DEG C or below and being initiated by free radicals formed from the decomposition of tert.-butyl peresters whose half life period at 90 DEG C is not more than 20 minutes, the polybutadiene content, based on the total reaction mixture, being at least 10% by weight, and at most 25% of the entire amount of chain-transfer agent (regulator) required being added before phase inversion and the remainder thereafter.

公开(公告)号：DE4017680A1

公开(公告)日：1991-12-05

申请号：DE4017680

申请日：1990-06-01

Applicant: BASF AG

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

IPC: C08F287/00 ,  C08L51/00

Abstract: Rubber-modified, impact-resistant ABS moulding materials (I) are claimed. (I) are obtd. by polymerisation of styrene (S) and acrylonitrile (AN) in a soln. of preformed rubber in (S), (AN) and opt. a solvent; the novelty is that (I) contains, as rubber, a styrene-butadiene (SB) block copolymer and other polymer(s) (II) which is/are compatible with the polystyrene component of the rubber and Also claimed is a process for the prodn. of (I), by radical polymerisation of (S) and (AN) by known methods in a reaction mixt. contg. (S), (AN), initiator, opt. a solvent, SB block copolymer rubber and (II). Pref., in addn. to the SB rubber, (I) also contains a polybutadiene rubber; (II) is polystyrene, poly(cyclohexyl) (meth)acrylate) and/or PPE. USE/ADVANTAGE - The addn. of (II) in combination with the SB rubber gives ABS (I) (esp. injection moulding materials) with a combination of high surface gloss and high notch impact resistance, which can be produced by soln. or bulk polymerisation. (22pp Dwg.No.0/0)