B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 39/20 (2006.01) B01J 41/14 (2006.01) C08F 2/18 (2006.01) C08F 4/36 (2006.01) C08F 4/38 (2006.01) C08F 8/00 (2006.01) C08F 212/04 (2006.01)
Patent
CA 2111022
ABSTRACT A method for producing a spherical crosslinked copolymer, which comprises polymerizing a monofunctional addition-polymerizable monomer and a polyfunctional addition-polymerizable monomer by suspension polymerization in an aqueous medium in the presence of a radical polymerization initiator of the following formula (a) or (b) which has a decomposition temperature for a half-life period of 10 hours within a range of from 60 to 120°C and which is capable of forming at least four radical initiating points per molecule by the decomposition: Image (a) wherein R1 is a linear or branched C1-10 alkyl group, R2 is a n-substituted C4-15 hydrocarbon group, and n is an integer of at least 2, wherein the plurality of R1 per molecule may be the same or different; (R4-O-O?mR5 (b) wherein R4 is a linear or branched C1-10 alkyl group, R5 is a m-substituted C4-25 hydrocarbon group, and m is an integer of at least 2, wherein the plurality of R4 per molecule may be the same or different.
Ito Tsuyoshi
Sugawara Toyokazu
Watanabe Junya
Mitsubishi Chemical Corporation
Smart & Biggar
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