Acrylate elastomer microspheres, not Sticky, esponjables insoluble in Solvent, and a process for preparing an aqueous suspension containing such areas

摘要

The invention relates to a swellable, solvent-insoluble, tack-free, elastomeric, acrylate microsphere having a shear storage modulus of at least 6.0 x 106 Pascals at 23 DEG C and 1 Hz and a Tg of less than about 0 DEG C, wherein the microsphere comprises the polymerization product of: (a) about 40 to about 99.7 equivalent weight % of free radically polymerizable monomer selected from the group consisting of alkyl acrylate esters of non-tertiary alkyl alcohols, the alkyl groups of the alcohols which comprise from about 4 to about 18 carbon atoms, alkyl methacrylate esters of non-tertiary alkyl alcohols, the alkyl groups of the alcohols which comprise from about 4 to about 18 carbon atoms, and mixtures thereof; (b) optionally, about 45 to about 1 equivalent weight % polar monomer copolymerizable with the monomer of element (a); and (c) about 10 to about 0.1 equivalent weight % of a multifunctional crosslinking agent. The invention also relates to processes of preparing suspensions of the microspheres and the suspensions produced thereby.