Polymer dispersions and their uses
AssigneeBASF Wyandotte Corporation
InventorDuane A. Heyman
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Abstract
This invention relates to polymer dispersions prepared by the in situ polymerization of an ethylenically unsaturated monomer or mixture of monomers in a chain extender in the presence of a free radical polymerization initiator and a polyamide stabilizer. The invention also relates to mixtures of the polymer dispersions with compounds having two or more active hydrogen atoms as determined by the Zerewittinoff method. These mixtures are used to prepare polyurethane products.
Claims6
A process for preparing a polyurethane elastomer comprising reacting a mixture of (a) a polymer dispersion prepared by the in situ polymerization of about 10 percent to about 70 percent by weight based upon the total weight of the dispersion of an ethylenically unsaturated monomer or mixture of monomers in a chain extender of a molecular weight of 62 to less than 400 selected from the group consisting of aliphatic and/or araliphatic diols having 2 to 14 carbon atoms in the presence of a free radical polymerization initiator and a polyamide stabilizer having a pendent amide group said polyamide having an average molecular weight of from about 5,000 to about 1,000,000, wherein the weight ratio of the monomer to the polyamide is from about 2:1 to about 100:1;
- and (b) a compound containing two or more active hydrogen atoms as determined by the Zerewitinoff method with a molecular weight of 1000 to 8000 with an organic polyisocyanate.
Dependencies are inferred from the claim text.