公开(公告)号：JPH02107611A

公开(公告)日：1990-04-19

申请号：JP26231788

申请日：1988-10-18

Applicant: SHOWA DENKO KK

Inventor： YOSHIDA HARUO ,  TAKOSHI HIROTAKA ,  ABE KAZUTO ,  ARAKAWA TSUTOMU ,  MARUYAMA SATOSHI

IPC: G02B1/04 ,  C08F290/00 ,  C08F299/00 ,  C08G75/02

Abstract: PURPOSE:To provide the title composition excellent in curability and giving cured products of outstanding high refractive index, low-water absorptivity and optical uniformity, comprising each specific liquid divinylbiphenyl isomer mixture, polythiol and radical polymerization initiator. CONSTITUTION:The objective curable composition suitable for optical materials, coating agents etc., comprising (A) a liquid divinylbiphenyl isomer mixture of formula I, (B) a polythiol of formula II (R is polyvalent organic group; n is >=2) (e.g. 9,10-anthracene dimethanethiol) and (C) 0.01-10mol%, based on the components A and B, of a radical polymerization initiator (e.g. 2,2- azobisisobutyronitrile), at the functional equivalent ratio A/B=0.01-1.0, and furthermore, if needed, (D) a filler such as glass fiber.

公开(公告)号：JPH02105824A

公开(公告)日：1990-04-18

申请号：JP25886388

申请日：1988-10-14

Applicant: SHOWA DENKO KK

Inventor： YOSHIDA HARUO ,  TAKOSHI HIROTAKA ,  ABE KAZUTO ,  ARAKAWA TSUTOMU ,  MARUYAMA SATOSHI

IPC: C08G75/02 ,  C08G75/04

Abstract: PURPOSE:To improve the curability of the title composition and the refractive index, water-absorbing property and optical uniformly of a cured product by compounding 3,3'-divinylbiphenyl, one of specified polythiols and a radical polymn. initiator. CONSTITUTION:A curable compsn. is obtd. by compounding 3,3'-divinylbiphenyl (A) of formula I, one of polythiols (B) of formula II (wherein R is a polyvalent org. group; n is 2 or larger) with an equimolar ratio of the functional groups of the component A to those of the component B of 0.001-1.01 [e.g., pentaerythritol tetrakis(3-mercaptopropionate)] and 0.001-20mol% radical polymn. initiator (C) based on the total amt. of the components A and B, which can form radicals by irradiation with heat, microwave, infrared light or ultraviolet light [e.g., 2,2'-azobis(2,4-dimethylvaleronitrile].

公开(公告)号：JPH01201306A

公开(公告)日：1989-08-14

申请号：JP2636788

申请日：1988-02-06

Applicant: SHOWA DENKO KK

Inventor： MARUYAMA SATOSHI ,  MINORIKAWA NAOKI ,  OTAKE ISAO ,  ARAKAWA TSUTOMU

IPC: G02B1/04 ,  C08F16/32 ,  C08F290/00 ,  C08F299/00 ,  G11B7/253

Abstract: PURPOSE:To provide an optical material having a low water absorptivity, excelling in optical homogeneity, abrasion resistance, etc., and suited for lenses, optical disc bases, etc., by constituting it from a (co)polymer of a specified alicyclic (meth)allyl ether compound. CONSTITUTION:This optical material is prepared from a polymer of a compound of formula I (wherein R1 and R2 are each H or methyl, l is 1-3, m and n are each 0-8, and 0

公开(公告)号：JPS63297008A

公开(公告)日：1988-12-05

申请号：JP13436387

申请日：1987-05-29

Applicant: SHOWA DENKO KK

Inventor： SAEDA SHIGERU ,  MARUYAMA SATOSHI ,  ARAKAWA TSUTOMU ,  MINORIKAWA NAOKI

IPC: G02B1/04 ,  B29C39/42 ,  B29L11/00 ,  G02B3/00

Abstract: PURPOSE:To produce the high quality plastic lens with good yield, while the surface contamination or unevenness of a molding, the mold release in polymerization process and the occurrence of voids are prevented by thermally polymerizing the raw material-monomer under the atmosphere whose oxygen concentration is lower than that of normal atmosphere until the stage where said monomer is polymerized and its gelation is initiated. CONSTITUTION:Two matrixes with desired curved surfaces are fixed oppositely by using an annular gasket, or two matrixes are positioned oppositely and are fixed by winding a tape around these matrixes. The raw material monomer containing a radical polymerization initiator and other additives is poured into the cavity between two matrixes, and is thermally polymerized under the atmosphere whose oxygen concentration is lower than that of normal atmosphere until the stage where its gelation is initiated. Next, the annular gasket or the tape is removed from the matrixes, and the thermal polymerization is further advanced and finished in the oxygen concentration of the normal atmosphere. The annular gasket or the tape is generally used as the means for fastening the matrixes, but the tape is preferably used from the point of operability.