Patent ID: 8580876
Filing Date: 2013-11-12
Classification: C08F,C08K

Abstract:
1. A concentrated aqueous polymer dispersion, comprising a) a polymer carrier prepared by heterophase radical polymerization of at least one ethylenically unsaturated monomer in the presence of b) a non-polar organic phenolic antioxidant, and c) a non-ionic, cationic or anionic surfactant, wherein: a weight ratio of the non-polar phenolic antioxidant to the polymer carrier is equal to or greater than 30 parts of the phenolic antioxidant per 100 parts of the carrier; a residual monomer content of the polymer carrier is below 2000 ppm; and the dispersion has an average particle size of less than 1000 nm, and wherein the phenolic antioxidant b) is represented by formula (A): wherein: R n ranges from 1-4, such that: when n is 1, then: A A A A A A when n is 2, then: when n is 3, then: when n is 4, then: L L L L