Roehm Gmbh Chemische Fabrik

Rohm Gmbh Chemische Fabrik

Juergen Omeis

Horst Pennewiss

Clemens Auschra

Michael Mueller

Norbert Rau

Claudia Beyer

Ruediger Jelitte

Bernhard Will

Michael Kunesch

The invention relates to polymer emulsions of poly(meth)acrylic acid esters and olefin copolymers suitable for improvement of the viscosity index, for use as oil additives. The polymer emulsion is formed of a continuous phase of poly(meth)acrylic acid esters and d-oligomers where the esters and oligomers have a bimodal molecular-weight distribution, a stabilizing agent (a graft or block polymerizate of an olefin copolymerizate and methacrylic acid esters), and a disperse phase of olefin copolymerizates distributed in the continuous phase.

Polymer emulsions with bimodal molecular-weight distribution

The present invention relates to comb polymers KP, produced from macromonomers of formula (I) ##STR1## where X represents a group which comes from the initiator system, preferably an alkyl group with 1-50 C atoms; R1 represents an alkyl group with 1-18 C atoms, preferably 1-10 C atoms, particularly preferably 1-4 C atoms; R2 and R3 each represent an alkyl group with 1-8 C atoms; and B represents a terminal alkene group with at least 2 and not more than 12 C atoms; wherewith the compound of formula (I) is converted, by means which are per se known, to a compound of formula (II) which contains an active hydrogen substituent in the terminal position: ##STR2## where X, R1, R2, a, b, and c are as defined above, and a represents the group B modified by introduction of the active hydrogen function; wherewith the compound of formula (II) in turn is acylated to a macromonomer of formula (IV) by a reagent MR which introduces the (meth)acryloyl group: ##STR3## where X, R1, R2, R3, A, a, b, and c are as defined above, and R4 represents hydrogen or methyl; and the macromonomers of formula (IV) thus obtained are converted to the comb polymers KP by radical polymerization with monomers M chosen from the group comprised of: (meth)acrylic acids of C.sub.1 -C.sub.28 -alkanols, functionalized radically polymerizable monomers, vinyl esters of fatty acids and vinylaromatic monomers.

Comb polymers

The present invention provides a polymer-modified bitumeniferous composition containing polymer components in the amount of 0.5-50 wt. %, wherein 20-100 wt. % of the polymeric additive is a copolymer comprises of units of: C.sub.6 -C.sub.28 -alkyl (meth)acrylates in the amount of 80-99.9 wt. %, maleic anhydride in the amount of 0.1-20 wt. %, and other polymerizable compounds in the amount of 0-19.9 wt %. The polymer-modified bitumens exhibit excellent and persistent homogeneity, high elastic resilience, and a good range of plasticity.

Alkyl (meth)acrylate-maleic anhydride copolymer-modified bitumen

A process for producing thin, anisotropic layers composed of liquid crystalline substances, the liquid crystalline substances being applied in a thin layer to one side of a support having a surface prestructured in such a way that the structure is given a preferred direction which determines orientation of the liquid crystalline substance and data storage devices produced.

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Bickenbach, Germany

Juergen Omeis