Bayer Aktiengesellschaft

Ineos Styrolution Group Gmbh

Bayer Materialscience Ag

Ineos Abs Limited

Ulrich Jansen

Herbert Eichenauer

Karl-Heinz Ott

Gisbert Michels

Hans-Erich Gasche

Wolfgang Fischer

Heinrich Alberts

Adolf Schmidt

Eckhard Wenz

Dieter Wittmann

Thomas Eckel

Karl-Erwin Piejko

Alfred Pischtschan

Edgar Leitz

Tobias Schulz

Otto Koch

Stefan Moss

Stefan Kaminsky

Norbert Niessner

Hans-Jurgen Kress

Horst Peters

Jochen Schoeps

Leo Morbitzer

Frank Wingler

Karl Zabrocki

Joachim Doring

Brian J Banaszak

Wolfgang Herrig

Ralph Ostarek

Frank Eisentraeger

Pierre Vanhoorne

Christian Ruthard

Rudy Verstraeten

Hans-Bernhard Hauertmann

Klaus Summermann

Nils Wittenberg

Wolfgang Dietz

Liqing-Lee Sun

Fabian Rueter

Frank Eisenträger

Fabian RÜTER

The present invention is directed to a process for the production of graft copolymer compositions which are based on acrylonitrile-styrene-acrylate (ASA) or acrylonitrile-butadiene-styrene (ABS) graft copolymers. The graft copolymers compositions are obtained by emulsion polymerization and afterwards precipitation, dewatering, drying and optionally cooling of the dried graft copolymer powder, wherein the graft copolymer B powder obtained is mixed with an aeration gas, preferably air and/or nitrogen, wherein the bulk density of the graft copolymer B powder is equal or less than 98.5% of the bulk density of the non-aerated graft copolymer B, during the whole aeration step. The graft copolymer powders show higher powder flowability and less tendency of caking during storage, for example in a silo.

Process for the production of graft copolymer powder compositions and thermoplastic resin compositions

The invention relates to a process for producing graft copolymers based on acrylonitrile-butadiene-styrene copolymers (ABS), wherein the graft copolymers may be dewatered particularly readily after production and precipitation and have a low residual moisture content after centrifugation. The invention further relates to a process for producing thermoplastic molding materials using the thus obtained ABS graft copolymers.

Process for producing ABS graft copolymers

The invention relates to a process for producing thermoplastic molding materials based on acrylonitrile-styrene-acrylate copolymers (ASA) having improved surface properties, in particular an improved stability of surface quality during storage in a hot and humid environment and a reduced content of residual monomers. The invention further relates to the use of a fluidized bed dryer and/or a flow dryer in the production of thermoplastic ASA molding materials for improving surface quality and the use of a fluidized bed dryer and/or a flow dryer in the production of thermoplastic ASA molding materials for reducing the content of residual monomers. The invention further provides ASA molding materials producible by means of the process according to the invention and also moldings.

Process for producing ASA plastics

The invention relates to a process for producing a stabilizer dispersion S, wherein the stabilizer dispersion is an aqueous composition comprising at least one phenolic stabilizer A, at least one thio co-stabilizer B, at least one surfactant C and at least one silicon oil component D. Further the present invention is directed to a process for producing a thermoplastic moulding composition, in particular an composition based on acrylonitrile butadiene styrene copolymers (ABS), using the stabilizer dispersion S.

Process for producing a stabilizer dispersion and process for producing a thermoplastic composition stabilized with the stabilizer dispersion

A process for preparing a thermoplastic polymer composition or a thermoplastic polymer blend, comprising: &#x2014;from 20 to 80% by weight of at least one water-moist elastomer component A containing up to 40%, preferably up to 30% by weight of residual water, &#x2014;from 20 to 80% by weight of at least one thermoplastic polymer B, &#x2014;from 0 to 40% by weight of at least one further polymer C, and &#x2014;from 0 to 60% by weight of additive(s) D, by mixing the elastomer component A with the thermoplastic polymer B and, if present, the further polymer C and, if present, the additive(s) D in an extruder, comprising the steps of precipitating the elastomer component A, and mechanical dewatering of the elastomer component A leads to improved salt-free products.

Process for the manufacturing of ABS-molding compositions

A Polymer compositions that features high degree of toughness, very good processability and extremely high gloss is disclosed. The composition contains

ABS moulding material with improved workability and a high lustre

The present invention provides polymer compositions of special graft rubber polymers, in the production of which are employed rubbers with defined particle diameters obtained by seed polymerization using seed latex particles with defined particle diameters.

Polymer compositions with improved property constancy

A molding composition having good surface gloss, high elongation at break and good thermoplastic processability is disclosed. The composition contains (A) a graft polymer that is obtained by free-radical polymerization of resin-forming vinyl monomers in the presence of rubber in latex form, (B) a copolymer of styrene and acrylonitrile and an optional (C) a resin selected from the group consisting of polycarbonates, polyester-carbonates, polyesters and polyamides. The preparation of the graft polymer is characterized in that (i) before the start of the grafting polymerization reaction the rubber latex is brought to a pH of 9 to 11, (ii) the redox initiator components are employed in amounts of 0.1 to 2.5 wt. % (based on the monomers metered in) and (iii) during the entire grafting polymerization reaction the pH remains constant&plusmn;0.5 and in the range of 11.0 to 8.8, and (iv) the temperature difference between the start and end of the reaction is at least 10&deg; C.

Thermoplastic molding materials based on special graft rubber components

A thermoplastic molding composition that features constancy of properties, especially toughness and processability is disclosed. The composition contains a first graft rubber polymer that is a product of emulsion polymerisation of styrene and acrylonitrile in the presence of a butadiene polymer latex (A) with a mean particle diameter d of 80 to 220 nm, a second graft rubber polymer obtained by emulsion polymerisation of styrene and acrylonitrile in the presence of a butadiene polymer latex (B) with a mean particle diameter d of 340 to 480 nm, and a rubber-free copolymer of styrene and acrylonitrile. Importantly, the butadiene polymer latex (A) is the product of seed polymerization using a seed latex with a mean particle diameter of 10 to 100 nm, and the butadiene polymer latex (B) is the product of seed polymerisation using the butadiene polymer latex (A) as seed latex.

Polymer compositions with an improved constancy of characteristics

The invention relates to a process for the preparation of graft rubber polymers of the ABS type by emulsion polymerization according to the so-called fed batch process, in which latexes having markedly reduced residual monomer contents are obtained, and to compositions containing the mentioned graft rubber polymers. The polymers so obtained have no negative effects at all on other properties

Process for the preparation of graft rubber latexes having a reduced residual monomer content

An elastic-thermoplastic graft polymer prepared by a multi-stage free radical polymerization is described. The elastic-thermoplastic graft polymer is prepared by polymerizing (i) one or more monomers containing vinyl groups, and (ii) at least one molecular weight regulating compound, in the presence of (iii) at least one rubber in latex form. The ratio of monomers (M) to the molecular weight regulating compound (MWR) is altered throughout the various stages of the polymerization method. The M:MWR ratio is: from 50:1 to 400:1 in the first stage; from 100:1 to 800:1 in the second stage; and from 200:1 to 2000:1 in the third stage of the polymerization. In at least one further reaction stage of the polymerization, the monomers, in the absence of the molecular weight regulating compound, are polymerized in the presence of the rubber. This further reaction stage occurs before the first stage and/or after the third stage of the polymerization. The multi-stage polymerization is conducted such that: M:MWR (first stage)&lE;M:MWR (second stage)<M:MWR (third stage). Also described are compositions comprising the elastic-thermoplastic graft polymer, and shaped articles prepared from such compositions.

Elastic-thermoplastic graft polymers prepared by multi-stage free radical polymerization

Thermoplastic moulding compositions of the ABS type of

ABS moulding compositions with improved properties

ABS type thermoplastic moulding compounds obtainable by

ABS type thermoplastic moulding compounds

Thermoplastic moulding materials containing

Polycarbonate moulding materials with improved toughness

Thermoplastic molding compounds of the ABS type of

ABS molding compounds with improved toughness

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Dormagen, Germany

Ulrich Jansen