C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/00 (2006.01) B01J 13/14 (2006.01) C08F 2/16 (2006.01) C08F 285/00 (2006.01) C09D 7/12 (2006.01) C09D 151/00 (2006.01) D21H 19/42 (2006.01)
Patent
CA 2140035
This invention relates to polymer particles that are acid-free in the swellable polymer core and to hollow polymer particles derived therefrom, and to a process for the production of these particles. The acid-free core advantageously decreases the polym- er particle's affinity to water. Applicants have discovered that non- carboxylated latexes having a variety of T g's will swell at tem- peratures higher than the T g of the polymer. These latex particles are useful as opacifying plastic pigments for various coat- ings and particularly as gloss-enhancing plastic pigments for paper and paperboard coatings. Preparation of the hollow polymer particle comprises the use of (meth)acrylate ester monomers, vinyl esters of carboxylic acids or a mixture thereof which are hydrolyzable and swellable at higher temperatures in alkaline environments. The particles may be encapsulated with a hard shell.
Leadbetter Arthur N.
Lee Do I.
Mulders Michael R.
Nicholson Dwayne J.
Dow Global Technologies Inc.
Smart & Biggar
The Dow Chemical Company
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