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Title:
COMPOSITION FOR OPTICAL MATERIALS
Document Type and Number:
WIPO Patent Application WO/2013/133144
Kind Code:
A1
Abstract:
The objectives of the present invention are to: inhibit the clouding of cured products obtained by polymerizing and curing a composition including sulfur and an episulfide compound, and inhibit the occurrence of clouding particularly in lenses, called plus-power lenses, that have large central thicknesses; and provide a composition for optical materials with which it is possible to predict and assess whether or not clouding will occur after curing and to determine quality at a stage before polymerization and curing. These objectives are achieved by, for example, a composition for optical materials that is characterized by comprising: sulfur the turbidity value of which when made into a 30-mass% carbon disulfide solution is 10 ppm or less; and an episulfide compound. That is, clouding is prevented and excellent transparency is achieved in optical materials produced from said composition for optical materials that comprises an episulfide compound and sulfur that satisfies the aforementioned condition in terms of turbidity value. Moreover, it is possible to provide a composition for optical materials with which it is possible to predict and assess whether or not clouding will occur after curing and to determine quality at a stage before polymerization and curing.

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Inventors:
TANAKA HIROAKI (JP)
HORIKOSHI HIROSHI (JP)
Application Number:
PCT/JP2013/055619
Publication Date:
September 12, 2013
Filing Date:
March 01, 2013
Export Citation:
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Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
C08G75/08; C07D331/02; G02B1/04
Foreign References:
JP2011231185A2011-11-17
JP2004043526A2004-02-12
JP2006348289A2006-12-28
JP2005336248A2005-12-08
JP2001002933A2001-01-09
JP2010153296A2010-07-08
JPH09110979A1997-04-28
JP2001002783A2001-01-09
JP2004043526A2004-02-12
JP2004137481A2004-05-13
JP2004269673A2004-09-30
Other References:
See also references of EP 2824129A4
Attorney, Agent or Firm:
KOBAYASHI Hiroshi et al. (JP)
Kobayashi 浩 (JP)
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