Roehm Gmbh Chemische Fabrik

Rohm Gmbh

Claudia Beyer

Horst Pennewiss

Ruediger Jelitte

Clemens Auschra

Heinz Jost

Juergen Omeis

Bernhard Will

The invention relates to a method for making oligomers, including homo-oligomers and cooligomers, by the free radical polymerization of at least one monomer component B) having a greater tendency to polymerize and 0-90 wt. %, calculated on the oligomers, of a monomer component A) having a lesser tendency to polymerize, at an elevated temperature and in the presence of a polymerization initiator in a conventional polymerization vessel, by adding monomer component B) to monomer component A), or to a solution of monomer component A), or merely to a solvent, so that the mol ratio of B) to A), if A) is present, passes through values of 0 to about 0.2 during the initial phase of the polymerization and takes the value 0.2 to 20 during the terminal phase of the polymerization, the reaction temperature being in a region in which a homopolymer of the monomer component B) is already significantly depolymerized, and the initiator, which has a half-life time at the reaction temperature from 1 minute to about 5 hours, being added throughout the duration of the polymerization in an amount from 0.1 to 10 percent of the total weight of the monomers.

Method for making oligomers

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

Synthetic oils comprising 5-100 percent by weight of an oligomer of

Synthetic oligomeric oils

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Seeheim-Jugenheim, Germany

Claudia Beyer