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    RESIN FOR OPTICAL LENS
    11.
    发明专利
    RESIN FOR OPTICAL LENS 失效

    公开(公告)号：JPH0651101A

    公开(公告)日：1994-02-25

    申请号：JP20234792

    申请日：1992-07-29

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  SUZUKI KAORU ,  YOKOTA MITSURU

    IPC: C08F220/18 ,  C08F20/34 ,  C08F30/08 ,  C08F220/10 ,  C08F220/36 ,  C08F230/08 ,  C08F290/00 ,  C08F299/08 ,  G02B1/04

    Abstract: PURPOSE:To obtain flexibility and stable UV absorptivity by forming the resin from the oxygen-permeable resin contg. silicon atom and copolymerized with an UV absorbent. CONSTITUTION:The resin consists of an oxygen-permeable resin copolymerized with an UV absorbent and contg. silicon atom and has an oxygen permeability coefficient of >=10X10 cm (STP).cm/cm .sec.mmHg. In this optical lens resin, the resin is the polymer of a siloxane having a double bond and a compd. having an acryloyl group copolymerized with the UV absorbent. In this case, the acryloyl group includes a methacryloyl group, the UV absorbent has an acryloyl group in the molecule, and the acryloyl group includes a methacryloyl group. Further, 0.01-10wt.% of the absorbent is copolymerized with the oxygen- permeable resin.

    PRODUCTION OF POLYESTER
    13.
    发明专利
    PRODUCTION OF POLYESTER 失效

    公开(公告)号：JPH1160714A

    公开(公告)日：1999-03-05

    申请号：JP22811497

    申请日：1997-08-25

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  KATOU YOSHIMASA ,  YOSHIOKA MASAO

    IPC: C08G63/183 ,  C08G63/86

    Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a polyester solving problems comprising the variation in the polymerization degree of the polyester due to the change in a reaction rate and the generation of foreign matters due to the deposition of one or more metals, and thereby enabling to produce the polyester little in color and having a stable color tone. SOLUTION: This method for producing a polyester comprises subjecting terephthalic acid and ethylene glycol as main components to an esterification reaction and subsequently subjecting the esterification product to a polycondensation reaction. Therein, antimony trioxide having a purity of >=99.0% and containing lead element and bismuth element in amounts of 30-60 ppm and

    PRODUCTION OF POLYESTER
    14.
    发明专利
    PRODUCTION OF POLYESTER 失效

    公开(公告)号：JPH09124783A

    公开(公告)日：1997-05-13

    申请号：JP28319995

    申请日：1995-10-31

    Applicant: TORAY INDUSTRIES

    Inventor： NOGAMI KATSUO ,  ITO SHIN ,  CHIKAMORI KAZUYUKI

    IPC: C08G63/183 ,  C08G63/78

    Abstract: PROBLEM TO BE SOLVED: To recycle a glycol component recovered at the step of polycondensation in a polyester production process as a starting material for the polyester production without purifying the recovered component by distillation. SOLUTION: In a process for producing a polyester by starting the esterification of a dicarboxylic acid with a glycol in a vacuum, adding the glycol further to the reaction system, increasing the degree of vacuum in the course of the esterification, completing the esterification, and conducting polycondensation while recovering the glycol, the glycol recovered at the step of polycondensation is used as at least a part of the glycol added after the starting of esterification.

    PREPARATION OF POLYESTER
    15.
    发明专利
    PREPARATION OF POLYESTER 失效

    公开(公告)号：JPH0859810A

    公开(公告)日：1996-03-05

    申请号：JP19670394

    申请日：1994-08-22

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  KAMATA KATSUMA ,  YOSHIOKA KAZUKI

    IPC: C08G63/91 ,  C08G63/78

    Abstract: PURPOSE: To obtain a polyester lowered in the amt. of the terminal carboxyl groups of the polymer chain and hence improved in hydrolytic resistance at a low cost by additionally adding a specific amt. of a dihydroxy component after completion of an esterification reaction and effecting a polymn. reaction after a specific period of time in a specific temp. range. CONSTITUTION: After completion of an esterification reaction (e.g. an esterification reaction of terephthalic acid with 1,4-butanediol), 0.1-0.5mol, based on the dicarboxylic acid component, dihydroxy component is additionally added to an esterification reaction vessel. The resulting mixture is stirred or allowed to stand in a temp. range of the b.p. of the dihydroxy component to the m.p. of the resulting prepolymer far 3 to 60min. Thereafter, the mixture is transferred to a polymerizer, wherein a polymn. reaction thereof is effected. According to the foregoing procedure, a polyester lowered in the amt. of the terminal carboxyl groups of the polymer chain can be prepd. at a low cost without needing large-scale remodeling of existent production facilities. This palyester is expected to be improved in salid phase polymerizability, lowered in water absorption, and improved in hydrolytic resistance under heat and moisture.

    CONTACT LENS
    17.
    发明专利
    CONTACT LENS 失效

    公开(公告)号：JPH05188329A

    公开(公告)日：1993-07-30

    申请号：JP472392

    申请日：1992-01-14

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  SUZUKI KAORU

    IPC: G02C7/04

    Abstract: PURPOSE:To obtain the contact lens by which a standard of the contact lens can be known easily from its external appearance by coloring it in a different color in accordance with a difference of the standard. CONSTITUTION:In two pieces or more of contact lenses having different standards, they are colored in different colors in accordance with a difference of the standards. In this case, as for the standards, the diameter, thickness, a base curve, lens power, etc., are given and also, there are the kind of a raw material, a lens design, a manufacture, a manufacturer's serial number, etc. As for a method for coloring in different colors, a method for coloring with different pigments are used, and also, a method for shading by using the same pigment, etc., are used. In such a way, that information related to a standard of a contact lens is obtained by an external appearance, the contact lens worn by a patient himself can be discriminated easily, and danger of erroneous wear can be prevented.

    PRODUCTION OF TEREPHTHALIC ACID AND POLYESTER
    18.
    发明专利
    PRODUCTION OF TEREPHTHALIC ACID AND POLYESTER 失效

    公开(公告)号：JPH1135664A

    公开(公告)日：1999-02-09

    申请号：JP19564097

    申请日：1997-07-22

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  KATOU YOSHIMASA ,  MIYAGAWA HIROYUKI

    IPC: C07C63/26 ,  C08G63/183

    Abstract: PROBLEM TO BE SOLVED: To obtain terephthalic acid for producing the corresponding low- discolored polyester with stable color tone, and to provide a method for the above polyester. SOLUTION: The subject terephthalic acid has the following characteristics: the content of 9-fluorenone-2, 6-dicarboxylic acid is =87%; and the light transmittance (at 340 nm) of its alkali solution after heated at 280 deg.C for 3 h (concentration at 7.5 g/dL) (quartz cell, optical path length being 10 mm) is >=70%. The other objective polyester is obtained by esterification between the terephthalic acid and a glycol followed by conducting a polycondensation.

    POLYESTER PELLET
    19.
    发明专利
    POLYESTER PELLET 失效

    公开(公告)号：JPH10292051A

    公开(公告)日：1998-11-04

    申请号：JP10316897

    申请日：1997-04-21

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  KAMATA KATSUMA ,  YOSHIOKA KAZUKI

    IPC: C08J3/12

    Abstract: PROBLEM TO BE SOLVED: To prevent the fusion of polyester pellets in the molding step and improve their blocking resistance by setting the band half-value width at a specified wavelength in the Raman spectrum at the surface and central part of a polyester pellet to a specified value or lower. SOLUTION: The half-value width of a band of 1,730 cm in the Raman spectrum at the surface of this polyester pellet is 22 cm or lower and that in the central part is 18 cm or lower. The pellet may be cylindrical, elliptically cylindrical, squarely cylindrical, platy, or spherical and has the size of one side of about 0.7-12 mm. The pellets are produced by extruding a molten polyester through a circular or elliptical die, cooling the resultant strand at the glass transition point or higher for a sufficient time, and cutting the solidified strand with a cutter or by cutting the extruded strand still in the semimolten state with a cutter and subjecting the resultant pellets to shearing treatment under machanical impact.

    PRODUCTION OF POLYESTER
    20.
    发明专利
    PRODUCTION OF POLYESTER 失效

    公开(公告)号：JPH10279677A

    公开(公告)日：1998-10-20

    申请号：JP8934897

    申请日：1997-04-08

    Applicant: TORAY INDUSTRIES

    Inventor： ITO SHIN ,  OGAWA TATSURO ,  KAMATA KATSUMA

    IPC: C08G63/183 ,  C08G63/78

    Abstract: PROBLEM TO BE SOLVED: To provide a process for producing a high-quality polyester industrially advantageously by reusing, as the raw material, a distilled glycol produced in a continuous polyester polymn. apparatus. SOLUTION: In a process for producing a polyester mainly from terephthalic acid and a glycol (pref. ethylene glycol or 1,4-butanediol) by using a continuous polyester production apparatus comprising two esterification reactors arranged in series and a polycondensation reactor, a part or the whole of a distillate mainly comprising a glycol and discharged from the second esterification reactor is reused, as it is without being purified by distillation, as a part or the whole of the raw material glycol.

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