Patent ID: 6355720
Filing Date: 2002-03-12
Classification: C08F,C08L

Abstract:
A latex formulation that exhibits reduced yellowing, comprising a polymeric particle, the polymeric particle comprising:(a) a seed latex polymer incorporating at least one monomer selected from the group consisting of vinyl aromatic monomers, alkyl acrylates, alkyl methacrylates, and combinations thereof; (b) an inner polymer layer overlying at least a portion of the seed latex polymer, the inner polymer layer incorporating monomers comprising: (i) an acetoacetoxy-containing monomer selected from the group consisting of acetoacetoxyalkyl acrylates, acetoacetoxyalkyl methacrylates, and combinations thereof; (ii) an ethylenically unsaturated estercontaining monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates and combinations thereof; and (iii) an ethylenically unsaturated monomer selected from the group of monomers consisting of vinyl aromatic monomers, acrylic acid monomers, methacrylic acid monomers, and combinations thereof; and (c) an outer polymer layer comprising less than about 5 percent by weight of total incorporated vinyl aromatic monomers and comprising at least one incorporated monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, and combinations thereof, wherein the inner polymer layer is positioned between at least a portion of the seed latex polymer and the outer polymer layer and the polymeric particle exhibits reduced yellowing upon exposure to ultraviolet light.