C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/16 (2006.01) C08F 220/18 (2006.01)
Patent
CA 2124342
The invention relates to a swellable, solvent-insoluble, tack-free, elastomeric, acrylate microsphere having a shear storage modulus of at least 6.0 x 10 6 Pascals at 23 °C and 1 Hz and a Tg of less than about 0 °C, wherein the microsphere comprises the polymerization product of: (a) about 40 to about 99.7 equivalent weight % of free radically polymerizable monomer se- lected 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 equi talent weight % of a multifunctional crosslinking agent. The invention also relates to processes of preparing suspen- sions of the microspheres and the suspensions produced thereby.
Delgado Joaquin
Silver Spencer F.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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