| 摘要 |
<p>PCT No. PCT/EP95/04091 Sec. 371 Date Sep. 16, 1997 Sec. 102(e) Date Sep. 16, 1997 PCT Filed Oct. 18, 1995 PCT Pub. No. WO96/12747 PCT Pub. Date May 2, 1996The present invention relates to a polyurethane-modified polyacrylate which is obtainable I. by polymerization with the addition a1) of an essentially carboxyl-free acrylate or of a mixture of acrylates, a2) of an ethylenically unsaturated monomer which carries at least one hydroxyl group per molecule and is essentially carboxyl-free or of a mixture of such monomers, and a3) of an essentially carboxyl-free, ethylenically unsaturated monomer which is different from (a1) and (a2), or of a mixture of such monomers, to give a polyurethane solution which contains no copoly-merizable double bonds, II. by subsequent further polymerization and addition b1) of at least one ethylenically unsaturated monomer which carries one carboxyl group per molecule, or of a mixture of such monomers, and b2) of an essentially carboxyl-free, ethylenically unsaturated monomer, or of a mixture of such monomers, after the monomers added in step I have been almost completely reacted, and III. by neutralization after the end of the polymerization, and dispersion in water.</p> |
