| 摘要 |
The present invention provides aqueous composition comprising a multi-stage acrylic emulsion polymer having a first stage polymer of from 0.5 to 4 wt.%, based on the total weight of monomers used to make the first stage polymer, of a copolymerized carboxylic acid or salt group containing monomer, and having 10 to 30 wt.%, on total solids of the multi-stage acrylic emulsion polymer, of a second stage polymer of from 3 to 15 wt.% of a copolymerized hydroxyl group containing monomer, the first stage polymer having a glass transition temperature (Tg) by dynamic mechanical analysis (DMA) of less than -10°C and the second stage polymer having a Tg (DMA) of greater than 80°C; and (ii) from 25 to 75 wt.%, based on the total solids weight of the multi-stage acrylic polymer, of a polyurethane. |
