Bayer Aktiengesellschaft

Adolf Schmidt

Herbert Eichenauer

Karl-Heinz Ott

Alfred Pischtschan

Udo W Hendricks

Heinrich Alberts

Joachim Probst

Karl-Erwin Piejko

Bruno Bomer

Ernst Roos

Ulrich Jansen

Martin Bohnenpoll

Christian Lindner

Ludger Heiliger

Werner Clarenz

Wolfhart Wieczorrek

Klaus Schuster

August Bockmann

Josef Pedain

Dieter Wittmann

Hanns P Muller

Werner Obrecht

Thomas Scholl

Herbert Bartl

Edgar Leitz

Walter Schafer

Frank Wingler

Peter Wendling

Karl Zabrocki

Gunter Kolb

Ulrich Eisele

Udo-Winfried Hendricks

Winfried Jeske

Lothar Liebig

Wilfried Litz

Gerd Wassmuth

Helmut M Meier

Gunther Schedrat

Karl H Ott

Ulrich Pallaske

Reinold Rose

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 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

Rubber mixtures prepared from at least one styrene/butadiene rubber gel and at least one rubber which contains double bonds and optionally further fillers and rubber auxiliary substances are in particular suitable for the preparation of vulcanizates having unusually high damping at temperatures of from -20 to +20.degree. C. as well as unusually low damping at temperatures of from 40 to 80.degree. C. The rubber mixtures may therefore be used, for example, to manufacture vehicle tires which grip in the wet and have low rolling resistance.

Rubber mixtures which contain SBR rubber gels

This invention relates to graft polymers of the ABS type which are produced in emulsion, and to thermoplastic molding compositions which are based thereon and which exhibit a very considerably increased notched bar impact strength compared with known ABS molding compositions and which at the same time exhibit high hardness values or high modulus values and good thermoplastic processability.

High-impact ABS moulding compositions

Elastic-thermoplastic graft polymers manufactured by radical emulsion polymerization of resin-forming vinyl monomers in the presence of rubber present in latex form with the use of a combination of a peroxide of formula (I) ##STR1## where R.sup.1 signifies alkyl, cycloalkyl and aryl groups with 4 to 20 carbon atoms,

Elastic-thermoplastic graft polymers with improved properties

ABS type thermoplastic moulding compounds obtainable by

ABS type thermoplastic moulding compounds

Moulding compounds the ABS type consisting of at least one resin matrix and a particulate graft-rubber polymer distributed therein and produced by emulsion polymerisation, wherein at least 70% of the graft-rubber particles (number) exhibit a structure of the rubber phase which can be detected by photographs taken with the aid of a transmission electron microscope and in which the individual particles contain irregular cellular inclusions of resin-forming polymer and the surface of the particles exhibits an irregularly jagged structure such that, for each particle illustrated, 5 to 30 of such jagged projections are present which differ from an idealised round particle (with a diameter d) by virtue of a diameter d+d/x with x=3 to 15, as well as a process for the manufacture of said moulding compounds.

ABS moulding compounds with novel morphology

Elastic-thermoplastic graft polymers manufactured by radical emulsion polymerisation of resin-forming vinyl monomers in the presence of rubber present in latex form with the use of a combination of a peroxide of formula (I) ##STR1## where R.sup.1 signifies alkyl, cycloalkyl and aryl groups with 4 to 20 carbon atoms,

New compounds corresponding to formula (I) ##STR1## and their use as emulsifiers for aqueous emulsions and, in the case of carboxylic acid derivatives, also as reactive groups for linking to biologically active substrates. New polymers synthesized from the emulsifiers and other monomers are also claimed.

Polymerizable emulsifiers and reactive groups and polymers of

The present invention relates to surface-active peroxides which can be employed as emulsifying initiators for the preparation of low-electrolyte polymer dispersions having a low tendency to foam.

Surface-active pereoxides and their use

Thermoplastic molding compositions of a vinyl chloride polymer and one or more emulsion polymers made with special emulsifiers have improved properties for technical application, such as reduced fogging. They are used for the production of molded articles, sheet products and films.

Vinyl chloride polymer based moulding compositions with reduced fogging

The invention relates to a process and an apparatus for determining the heat output rate in a reactor. This is achieved by determining the heat output rate in a sensor connected to the chemical reactor and taking into account the volume or mass ratio between the reactor and sensor contents. The apparatus allows balancing of the sensor, on the one hand, and continuous adjustment of the material composition and temperature of the reactor and sensor contents, on the other hand.

Calorimeter sensor

Reaction products of 1 mol of a cycloaliphatic diol corresponding to formula I

Emulsifiers and a process for the production of large particle size,

Growing community of inventors

Cologne, Germany

Adolf Schmidt