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    PRODUCTION OF POLYHYDROXYCARBOXYLIC ACID
    3.
    发明专利
    PRODUCTION OF POLYHYDROXYCARBOXYLIC ACID 失效

    公开(公告)号：JPH10168167A

    公开(公告)日：1998-06-23

    申请号：JP33054496

    申请日：1996-12-11

    Applicant: KYOWA YUKA KK

    Inventor： MARUYAMA HIROSHIGE ,  MURAYAMA SHUNICHI ,  YANAGISAWA TOKUO ,  TSUZAKI NOBUKO

    IPC: C08G63/06 ,  C08G63/83 ,  C08G63/85 ,  C08L101/16

    Abstract: PROBLEM TO BE SOLVED: To simply obtain the subject high molecular weight polymer useful as a medical stitch, etc., excellent in biodegradability in high purity by subjecting a hydroxycarboxylic acid or its oligomer to polycondensation in the presence of a specific polycondensation catalyst. SOLUTION: (A) A hydroxycarboxylic acid or its oligomer (e.g. including lactic acid) is subjected to polycondensation in the presence of (B) a polycondensation catalyst comprising an alkali (earth)metal-based compound or a metal-based compound belonging to the group IIIb of the periodic table [e.g. a catalyst in a form of (bi)carbonate, a hydroxycarboxylic acid salt, an acetic acid salt or a (hydr)oxide]. Furthermore, the reaction is carried out by adding the component B thereto so that its concentration in reaction solution becomes 5-1,000ppm. Thereby, a high molecular weight biodegradable polymer having 30,000 to 100,000 weight-average molecular weight can simply be obtained in high purity without requiring removal of catalyst.

    COMPOSITION CONTAINING POLYMER OR COMPOUND HAVING DITHIOCARBONATE GROUP
    4.
    发明专利
    COMPOSITION CONTAINING POLYMER OR COMPOUND HAVING DITHIOCARBONATE GROUP 失效

    公开(公告)号：JP2001081264A

    公开(公告)日：2001-03-27

    申请号：JP25520399

    申请日：1999-09-09

    Applicant: KYOWA YUKA KK

    Inventor： MURAYAMA SHUNICHI ,  HAGINO HIROFUMI ,  JINBO SHINICHIRO ,  SHIRAI HIROYOSHI ,  KIMURA RIKU

    IPC: C09K3/10 ,  C08F20/38 ,  C08K5/34 ,  C08L33/04 ,  C09D7/12 ,  C09D11/03 ,  C09D11/10 ,  C09D11/102 ,  C09D133/04 ,  C09D171/00 ,  C09J133/04 ,  C09J171/00 ,  H01L23/29 ,  H01L23/31

    Abstract: PROBLEM TO BE SOLVED: To obtain a composition which hardly emits a sulfur-like odor and is excellent in hardness, strengths, adhesiveness, and resistances to water, chemicals, weather, staining, blocking, or the like, by compounding a compound or polymer having at least one 5-memebered cyclic dithiocarbonate group, a nucleophilic reagent, and a metal phthalocyanine (salt). SOLUTION: A polymer or compound having at least one 5-membered cyclic dithiocarbonate group represented by formula I, a nucleophilic reagent, and 0.0001-10 wt.% metal phthalocyanine (salt) represented by formula II are compounded. In the formulas, R1 to R3 are each H or a lower alkyl; X is a metal atom; and Y1 to Y16 are each H, an alkyl, a substituted alkyl, a halogen, nitro, amino, azo, thiocyanate, carboxyl, a haloformly, formyl, carbamoyl, cyano, hydroxyl, an alkoxy, an aryloxy, or the like. The nucleophilic reagent is the one which gives a share in electrons to the thiocarbonyl group of the 5-membered cyclic dithiocarbonate group, and its example is a compound having an amino, hydroxyl, imino or thiol group.

    PRODUCTION OF POLYHYDROXYCARBOXYLIC ACID
    5.
    发明专利
    PRODUCTION OF POLYHYDROXYCARBOXYLIC ACID 失效

    公开(公告)号：JPH10204156A

    公开(公告)日：1998-08-04

    申请号：JP650597

    申请日：1997-01-17

    Applicant: KYOWA YUKA KK

    Inventor： MARUYAMA HIROSHIGE ,  MURAYAMA SHUNICHI ,  YANAGISAWA TOKUO ,  TSUZAKI NOBUKO ,  KODAMA AYA ,  HOTTA KOJI

    IPC: C08G63/06 ,  C08G63/08 ,  C08G63/83 ,  C08L101/16

    Abstract: PROBLEM TO BE SOLVED: To obtain an excellent biodegradable plastic by subjecting a mixture mainly comprising a hydroxycarboxylic acid or its oligomer obtd. by the distillation of a hydroxycarboxylic acid or its lactide to polycondensation by dehydration in the presence of a polycondensation catalyst. SOLUTION: An aq. lactic acid soln. having a concn. of 50-90wt.% is dehydrated at 120-150 deg.C and distilled at 130-200 deg.C under a reduced pressure to give a mixture mainly comprising a 2-6C aliph. hydrocarboxylic acid (e.g. lactic acid). A mixture mainly comprising lactic acid is melted by heaing to 120-180 deg.C in a nitrogen atmosphere in the presence of 0.03-10wt.% (based on the mixture) catalyst comprising an inorg. solid acid catalyst (e.g. aluminum silicate) alone or a combination thereof with an alkali metal compd. catalyst and then is subjected to polycondensation at 160-250 deg.C under a reduced pressure, thus giving a polymer having an average mol.wt. of 50,000-300,000. The polymer is used for wrapping films, drink bottles, drug delivery systems, etc.

    METHOD FOR PREVENTING BAD ODOR FROM EMANATING
    7.
    发明专利
    METHOD FOR PREVENTING BAD ODOR FROM EMANATING 失效

    公开(公告)号：JP2001164128A

    公开(公告)日：2001-06-19

    申请号：JP2000057424

    申请日：2000-03-02

    Applicant: KYOWA YUKA KK

    Inventor： MURAYAMA SHUNICHI ,  HAGINO HARUFUMI ,  GONNO AKIHIRO ,  TSUZAKI NOBUKO

    IPC: A61L9/01 ,  C08F20/38 ,  C08G65/334 ,  C08K3/10 ,  C08K5/06 ,  C08K5/1515 ,  C08K5/17 ,  C08L33/14 ,  C08L71/00 ,  C08L101/02

    Abstract: PROBLEM TO BE SOLVED: To provide a method for preventing a bad odor from emanating from a composition which contains a nucleophilic reagent and a polymer or compound having a 5-membered-cyclic dithiocarbonate group (or groups) and is useful for coating materials, adhesives, inks, sealants for buildings, sealants for semiconductors, etc., or a method for preventing a bad odor from emanating from a cured item obtained by curing the composition and to provide a method for improving the properties of the cured item. SOLUTION: The method for preventing a bad odor from emanating comprises the incorporation of an epoxy compound into a composition containing a nucleophilic reagent and a polymer or compound having a 5-membered-cyclic dithiocarbonate group (or groups) represented by formula I (R1, R2, and R3 are each H or a lower alkyl) or into a cured item obtained by curing the composition. The properties of the cured item are improved by the above method.

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