| 摘要 |
<p>The present invention provides a coating composition containing a two-stage polymer emulsion. The two-stage emulsion polymer contains composite polymeric particles of a first stage polymer prepared from about 0.25% to about 5% by weight monomer having at least two polymerizable ethylenically unsaturated groups, about 2.5% to about 10% by weight hydroxyl monomer, preferably at least about 50% by weight of non-functional monomer of hydrophobic monomer, and preferably without addition of any acid-functional monomer; and a second stage polymer having a theoretical glass transition temperature at least about 50C prepared using, by weight, about 25% to about 50% by weight hydroxyl monomer, about 3% to about 9% carboxylic acid monomer, preferably at least 25% by weight of non-functional monomer of hydrophobic monomer;. The composite polymeric particles have a theoretical glass transition temperature of not more than about 30C, preferably not more than about 0C, and include from about 0.8% to about 2% by weight of carboxylic acid monomer.</p> |
