Polymerizing monomers in presence of polyol and castor oil-polyol product
AssigneeBayer Aktiengesellschaft
InventorsTorsten Heinemann, Hans-Joachim Scholl, Manfred Dietrich, Gundolf Jacobs, Mark Kratz, Josef Sanders, Helmut Woynar
Life of this patent
Estimating the term…
Abstract
A process is described for the preparation of stable, agglomerate-free, low-viscosity graft copolymer dispersions by the free-radical polymerization of olefinic monomers, such as styrene and/or acrylonitrile, with polyol compounds in the presence of a hydroxyl compound modified with castor oil. The use of these graft copolymer dispersions in the manufacture of polyurethane plastics, particularly flexible foams, by the isocyanate polyaddition process is also described.
Claims10
A process for the preparation of stable, low-viscosity graft copolymer dispersions by the free-radical polymerization of a reaction mixture in the presence of a free-radical catalyst, wherein said reaction mixture comprises:
- 1) at least one ethylenically unsaturated monomer,
- 2) at least one base polyol having at least two hydroxyl groups,
- and
- 3) at least one modified hydroxyl group containing compound which is prepared by reacting a) castor oil with b) a polyol in a molar ratio of 1.1:1 to 10:1.
Dependencies are inferred from the claim text.