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Title:
OPTICALLY EXCELLENT METHACRYLIC RESIN
Document Type and Number:
Japanese Patent JPH03294307
Kind Code:
A
Abstract:
PURPOSE:To provide the subject resin containing extremely small amounts of raw material-originated foreign matters and by-products and useful as a material for optical disks due to the optically excellent property thereof by filtering a monomer mixture mainly containing methyl methacrylate with a specific filter and subsequently polymerizing the monomer mixture by a specified method. CONSTITUTION:A monomer mixture mainly containing methyl methacrylate is filtered with a filter having pore sizes of <=0.1mum and subsequently continuously bulk-polymerized in the presence of an inert gas under a dissolved oxygen content of <=2ppm at 100-150 deg.C to provide the objective resin having a polymer end double bond ratio of <=2.5% measured by gel permeation chromatography(G. P.C) and nuclear magnetic resonance(NMR). The monomer mixture is preferably a mixture consisting of 88-99wt.% methyl methacrylate and 1-12wt.% of at least one of methyl acrylate, ethyl acrylate and butyl acrylate.

Inventors:
SHIMOMURA YASUNOBU
MATSUSHIMA MASAHIRO
Application Number:
JP9556790A
Publication Date:
December 25, 1991
Filing Date:
April 11, 1990
Export Citation:
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Assignee:
MITSUBISHI RAYON CO
International Classes:
C08F2/02; C08F6/00; C08F6/06; C08F20/10; C08F120/18; C08F220/10; C08F220/14; G11B7/24047; G11B7/2533; (IPC1-7): C08F2/02; C08F120/18
Domestic Patent References:
JPH03111408A1991-05-13
JPS5232665A1977-03-12
JPS5342261A1978-04-17
JPS6391601A1988-04-22
JPS6357613A1988-03-12