| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multi-stage polymer emulsion suitable for forming a pressure sensitive adhesive with high peel and high temperature cohesion. <P>SOLUTION: The multi-stage emulsion polymer comprises: (a) 90 to 99.5 wt.% of a first polymer, based on total weight of first polymer and reinforcing polymer, wherein the first polymer is formed from at least one ethylenically unsaturated monomer, and has a Tg of less than -20°C, and is polymerized in the presence of 3 to 12 mmoles of chain transfer agent per kg of monomers in the first polymer; and (b) 0.5 to 10 wt.% of a reinforcing polymer based on total weight of first polymer and reinforcing polymer, wherein the reinforcing polymer either has a Tg of 60°C or higher, or is formed from monomers having two or more alpha, beta-ethylenically unsaturated groups, or combinations thereof. <P>COPYRIGHT: (C)2010,JPO&INPIT |
