Bayer Aktiengesellschaft

Fritz Mietzsch

Heinrich Alberts

Herbert Bartl

Hans Rudolph

Heinrich Wolfers

Otto Billinger

Dieter Arlt

Manfred Jautelat

Hugo Vernaleken

Hans-Heinrich Moretto

Volker Serini

Hans Sattlegger

Dietrich Hardt

Wolfram Mayer

Hans Friemann

Ulrich Steffen

Klaus Riebel

Hans-Ferdinand Muisers

Dietrich K Hardt, Deceased

The object of the invention is the use of ethylene-vinyl acetate-copolymers produced by emulsion polymerization and containing unipolymerized acids, for the modification of polyvinyl chloride.

Use of special ethylene-vinyl acetate-copolymers for the modification of

A vinyl acylanhydrocitrate of the formula ##STR1## in which R denotes hydrogen or lower alkyl is disclosed. The vinyl acylanhydrocitrates can be prepared by initially contacting citric acid with a carboxylic anhydride or carbonyl chloride followed by transesterification of the reaction product either with vinyl acetate in the presence of a catalyst or with acetylene. The vinyl acylanhydrocitrates can be polymerized or copolymerized to form useful products useful for inclusion in adhesive compositions, for crosslinking in coating systems and duromers or, after ring opening with bases, as dispersing auxiliaries or agents to increase the viscosity of aqueous systems.

Vinyl acylanhydrocitrates and their preparation

A co-grafted polymer dispersion comprising blocks of an organopolysiloxane with OH functional groups, blocks of an ethylene/vinyl ester copolymer containing about 5 to 99% by weight of incorporated vinyl ester, and blocks of vinyl monomer units polymerized in the presence of mixtures of the organopolysiloxane and ethylene/vinyl ester copolymer, the organopolysiloxane and ethylene/vinyl ester copolymer blocks being linked via vinyl polymer bridges. The dispersions mixed with suitable catalysts, can cure under the influence of atmospheric moisture to elastic tack-free rubbers suitable as sealants.

Crosslinked silicone-vinyl polymer systems

A notched-impact-resistant polyvinyl chloride moulding composition having a low shrinkage value, based on vinylchloride polymers and impact-resistant modifiers, containing from 0.01 to 5% by weight, based on the total of vinylchloride polymer and impact-resistant modifier, of liquid polysiloxanes having viscosities of from 20 to 100,000 cSt and/or solid polysiloxanes having molecular weights of from 20,000 to 500,000 and optionally conventional additives and auxiliaries.

Polyvinyl chloride moulding composition

Substituted tartaric acids and tartaric acid derivatives have proved to be highly reactive initiators for starting radical polymerization resp. hardening reactions of unsaturated compounds and mixtures of compounds, particularly unsaturated polyester resins.

Radical polymerization in the presence of substituted tartaric acid or

A process for the preparation of dispersions of optionally cross-linked ethylene-vinyl ester graft polymers wherein an ethylene-vinyl ester copolymer is used as graft substrate and a vinyl ester of a C.sub.1 -C.sub.18 carboxylic acid and/or a C.sub.1 -C.sub.10 -alkyl ester of acrylic and/or methacrylic acid are used as a graft monomer which is polymerized, optionally together with a cross-linking agent having two or more C--C double bonds, in organic solution until at least 25% by weight of the graft monomer has been reacted, the reaction product is converted into a stable finely divided dispersion by the addition of a precipitating agent under the action of shearing forces and polymerisation is completed before, during or after the formation of the dispersion.

Process for the preparation of ethylene-vinyl ester graft polymer

Graft copolymers of A 2 to 30% by weight of a polysaccharide ester as graft basis, and B 98 to 70% by weight of a grafted monomer mixture of (1) 8 to 90% by weight of ethylene and (2) 92 to 10% by weight of vinyl acetate. The polymers are suitable for the production of moulding compounds, films, packaging foils, and coatings.

Graft polymers of polysaccharide esters

A process for the copolymerization of ethylene at pressures of from 200 to 3500 atms and temperatures of from 130.degree. to 300.degree. C., wherein silyl ethers are used as initiators.

Process for the polymerization of ethylene in the presence of silyl

A process for the polymerization of ethylene and optionally further .alpha.,.beta.-unsaturated monomers at temperatures of from 100.degree. to 350.degree. C. and at pressures of from 600 to 3500 in the presence of 1,2 diaryl glycols atoms or 1,2-diaryl glycol alkyl ethers as initiators.

Process for the polymerization of ethylene in the presence of diaryl

Process for the production of vinyl chloride polymers modified with aromatic polycarbonate, characterized in that mixtures of olefinically unsaturated monomers containing at least 70 % by weight of vinyl chloride are polymerized by radical polymerization in the presence of aromatic polycarbonates, 0 - 100 % by weight of rubber or rubber-modified thermoplastic resin, based on the polycarbonate-modified vinyl chloride polymer, being added before or after polymerization.

Growing community of inventors

Cologne, Germany

Fritz Mietzsch