Patent ID: 9284444
Filing Date: 2016-03-15
CPC Classification: B29B,B29K,B29L,C04B,C08F,C08L

Claim Text:
1. A shelf-stable composition for use in dry mix applications comprising a water redispersible polymer powder (RDP) composition containing B) a multi-stage acrylic copolymer RDP and A) from 0.1 to 7.5 wt. %, based on the total weight of A) and B), of a dry anionic associative thickener selected from a hydrophobically modified alkali swellable acrylic emulsion copolymer (HASE), an alkali swellable acrylic emulsion copolymer, and mixtures thereof, the multi-stage acrylic copolymer RDP B) having a calcium methacrylate salt group containing alkali-soluble resin outer stage and one or more inner stage, the RDP further containing each of one or more nucleating agent having a boiling point of 150° C. to 500° C. and a water solubility of 3.5% or less, and one or more colloidal stabilizer, wherein when the multi-stage acrylic copolymer is dispersed in water the one or more inner stage comprises an acrylic (co)polymer having a glass transition temperature (Tg) of from −10 to 15° C. calculated using the Fox equation, and the weight ratio of the alkali-soluble resin outer stage to the one or more inner stage(s) ranges from 1:19 to 2:3 and the dry anionic associative thickener, the colloidal stabilizer, the nucleating agent and the multi-stage acrylic copolymer are contained in the same particle.