Title:
PRODUCTION OF POLYMER
Document Type and Number:
Japanese Patent JP3623891
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a molding methacrylic material having excellent transparency, heat resistance, and mechanical strengths, low water absorption, and low birefringence by a high-productivity industrially practicable manner by polymerizing an α-substituted acrylic acid ester at a specified temperature or higher.
SOLUTION: An α-substituted acrylic ester monomer represented by the formula (wherein R is a 1-20C hydrocarbon group) or 10-70 wt.% α-substituted acrylic ester monomer is copolymerized with other vinyl monomers at a polymerization temperature of 115°C or above to obtain a polymer or a copolymer. The polymerization initiator used is desirably one having a 10-hr half-life temperature of at least 90°C and is exemplified by di-t-butyl peroxide (having a 10-hr half-life temperature of 125°C), diisopropylbenzene hydroperoxide (148°C), or 2,2-bis(4,4-di-t-butylperoxycyclohexyl)propane (92°C). The polymerization process is desirably suspension polymerization or bulk polymerization.
Inventors:
Koji Nishida
Takayuki Makino
Tokimitsu Toru
Takayuki Makino
Tokimitsu Toru
Application Number:
JP36093398A
Publication Date:
February 23, 2005
Filing Date:
December 18, 1998
Export Citation:
Assignee:
Mitsubishi Rayon Co., Ltd.
International Classes:
C08F32/06; C08F220/26; C08F222/10; (IPC1-7): C08F220/26
Other References:
Macromolecules,1991年,24(8),2036-42