Title:
HIGH-REFRACTIVE INDEX PLASTIC LENS
Document Type and Number:
Japanese Patent JPH0572401
Kind Code:
A
Abstract:
PURPOSE:To provide the above plastic lens which is good in moldability, transparency, dyeability, and impact resistance, is light in weight and is lessened in yellowing at the time of polymn. by copolymerizing diallyl isophthalate, diethylene glycol and diallyl terephthalate. CONSTITUTION:The three-component copolymer consisting of 10 to 70wt.% diallyl isophthalate, 20 to 60wt.% diethylene glycol (allyl carbonate) and 10 to 50wt.% diallyl terephthalate is used as an essential component. Further, the refractive index of the molding is >=1.530 and <1.560. An increase in the refractive index is hardly admitted if the total of the amt. of the diallyl isophthalate and the diallyl terephthalate is below 40wt.%. Physical and chemical characteristics are poor and such are molding is undesirable as the lens for spectacles if the total exceeds 80wt.%. The yellowing of the lens is conspicuous if the amt. of the diallyl isophthalate exceeds 70wt.%. The yellowing of the lens is conspicuous if the amt. of the diallyl isophthalate is below 10wt.%.
Inventors:
YAMAMOTO NOBUYOSHI
WAKABAYASHI TSUNEO
HAYASHI NAONORI
WAKABAYASHI TSUNEO
HAYASHI NAONORI
Application Number:
JP25961591A
Publication Date:
March 26, 1993
Filing Date:
September 11, 1991
Export Citation:
Assignee:
ASAHI GLASS CO LTD
International Classes:
C08F218/00; C08F18/00; C08F18/18; C08F218/16; G02B1/04; (IPC1-7): C08F218/00; C08F218/16; G02B1/04
Attorney, Agent or Firm:
Kenji Izumina
Next Patent: JPH0572402