Title:
PRODUCTION OF ORGANIC/INORGANIC COMPOSITE POLYMER
Document Type and Number:
Japanese Patent JP3419570
Kind Code:
B2
Abstract:
PURPOSE: To produce an organic/inorganic composite polymer improved in transparency by subjecting an organic/inorganic composite material containing a metal oxide obtained by performing the hydrolysis and subsequent dehydrative condensation of a metal alkoxide in the presence of an organic monomer and an organic monomer to a polymerization treatment.
CONSTITUTION: An organic monomer (e.g. (meth)acrylamide) in an amount of 10 pts.wt. selected from monomers having amide bonds, imide bonds, urethane bonds or urea bonds and 10-4-40 pts.wt. alkoxide of a metal selected from Si, Ti, Zr, etc., (e.g. silicon tetraoxide) are dissolved in a 1-4C alcohol solvent, a catalyst (e.g. 1×10-1 to 10 N aqueous ammonia solution) is added to the solution, and the resultant mixture is subjected to hydrolysis and dehydrative condensation at 25-150°C. The alcohol, water and NH3 are distilled off to obtain an organic/inorganic composite material containing the metal oxide and the organic monomer. A mixture formed by adding a radical polymerization initiator to the composite material is poured into a mold and polymerizad by heating to a predetermined temperature to obtain an organic/inorganic composite polymer molding being small in the dependency of a coefficient of linear thermal expansion and a refractive index on temperature and having excellent transparency.
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Inventors:
Takeshi Ohkubo
Hiroaki Tanji
Hiroaki Tanji
Application Number:
JP30342794A
Publication Date:
June 23, 2003
Filing Date:
December 07, 1994
Export Citation:
Assignee:
HOYA Corporation
International Classes:
C08L33/24; C08F2/44; C08K3/20; C08L35/00; C08L57/00; C08L83/04; C08L85/00; C08L101/00; C08L101/12; (IPC1-7): C08L101/00; C08F2/44; C08K3/20
Domestic Patent References:
| JP6448001A |
Attorney, Agent or Firm:
Shizuo Nakamura (1 outside)