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    PREVENTION OF DISCOLORATION OF ORGANIC ISOCYANATE COMPOUND
    3.
    发明专利
    PREVENTION OF DISCOLORATION OF ORGANIC ISOCYANATE COMPOUND 失效

    公开(公告)号：JPH0920744A

    公开(公告)日：1997-01-21

    申请号：JP16876295

    申请日：1995-07-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MATSUZAKA YASUHIRO ,  MURATA NAOHIRO ,  ISHIKAWA KEIKO ,  TANIGUCHI TOSHIYUKI ,  TAKAYANAGI HIROSHI

    IPC: C07C263/18 ,  C07C265/14 ,  C09K15/08 ,  C09K15/32

    Abstract: PROBLEM TO BE SOLVED: To obtain a high-quality organic isocyanate compound by adding a specific three component-based discoloration inhibitor to the compound, useful as a raw material for an elastic material, a foam, an adhesive, etc., while effectively preventing discoloration. SOLUTION: The method for preventing discoloration of an organic isocyanate compound comprises blending (A) an organic isocyanate compound with (B) a compound of the formula [R1 and R2 are each a 1-10C (branched) saturated hydrocarbon group; R3 is R1 or (thio) ether group] [e.g. 4,4'- butylidenebis(3-methyl-6-tert-butyphenol)] (B1 ), 2,6-di-tert-butyl-4-methylphenol (B2 ) and triphenyl phosphite (B3 ), for example, in the ratio of 100 pts.wt. of the component A, 0.005-1 pt.wt., especially 0.01-0.05 pt.wt. of the component B1 , the component B2 and the component B3 , respectively.

    POLYURETHANE SOLUTION, POLYURETHANE MOLDING, AND THEIR PRODUCTION
    4.
    发明专利
    POLYURETHANE SOLUTION, POLYURETHANE MOLDING, AND THEIR PRODUCTION 失效

    公开(公告)号：JPH0912670A

    公开(公告)日：1997-01-14

    申请号：JP16876495

    申请日：1995-07-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MATSUZAKA YASUHIRO ,  MURATA NAOHIRO ,  ISHIKAWA KEIKO ,  TAKAYANAGI HIROSHI

    IPC: C08L75/04 ,  C08G18/00 ,  C08G18/10 ,  C08G18/65 ,  C08L75/00 ,  D01F6/70 ,  D06M13/02 ,  D06M13/325 ,  D06M13/328 ,  D06M15/564 ,  D06M101/00 ,  D06M101/16 ,  D06M101/30

    Abstract: PROBLEM TO BE SOLVED: To obtain a stable polyurethane soln. which is prevented from coloration and viscosity change even when a polar solvent with a high impurity content is used by reacting a prepolymer contg. an org. diisocyanate with a chain extender in a polar solvent in the presence of a specific compd. SOLUTION: In producing a polyurethane soln. by reacting a prepolymer formed from an org. diisocyanate and a straight-chain compd. having two active hydrogen atoms and a mol.wt. of 250-4,000 with a chain extender in a polar solvent or by reacting a mixture comprising a straight-chain compd. having two active hydrogen atoms and a mol.wt. of 250-4,000 and a chain extender with an org. diisocyanate, the reaction is conducted in the presence of a one-side hindered phenol represented by the formula (wherein R1 and R2 are each a 1-10C satd. hydrocarbon group; and R3 is a 1-10C hydrocarbon group or an ether or thioether group) in an amt. of 50-50,000ppm based on the nonvolatile components. Thus, a polyurethane soln. excellent in physical properties is obtd. even when a recovered polar solvent having a high impurity content is used, and a molding obtd. by removing the solvent from the soln. has excellent physical properties.

    PRODUCTION OF POLYURETHANEUREA MOLDING
    5.
    发明专利
    PRODUCTION OF POLYURETHANEUREA MOLDING 失效

    公开(公告)号：JPH08176268A

    公开(公告)日：1996-07-09

    申请号：JP32280594

    申请日：1994-12-26

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MATSUZAKA YASUHIRO ,  MURATA NAOHIRO ,  TAKAYANAGI HIROSHI ,  ISHIKAWA KEIKO

    IPC: C08G18/10 ,  C08G18/65 ,  C08G18/66 ,  C08G18/72 ,  C08G18/76 ,  C08G18/82

    Abstract: PURPOSE: To produce a polyurethaneurea molding with a low hysteresis loss by reacting a specific org. diisocyanate with a linear compd., subjecting the resulting, prepolymer to chain extension to give a polyurethane soln., and removing the org. solvent from the soln. CONSTITUTION: A polyurethaneurea molding is produced by reacting an org. diisocyanate with a linear compd. having two active hydrogen atoms and a mol.wt. of 250-4,000, subjecting the resulting prepolymer to chain extension with a diamine or a mixture of a diamine with a monoamine in an org. solvent to give a polyurethaneurea soln., and removing the solvent from the soln. by a wet or dry method. In the above process, diphenylmethane diisocyanate comprising 2-50% 2,4'-isomer (including 2,2'-isomer) and 98-50% 4,4'-isomer and having a sum of the acid content and the hydrolyzable chlorine content of 20ppm or lower is used as the org. diisocyanate.

    POLYURETHANE SOLUTION, POLYURETHANE MOLDING, AND THEIR PRODUCTION
    6.
    发明专利
    POLYURETHANE SOLUTION, POLYURETHANE MOLDING, AND THEIR PRODUCTION 失效

    公开(公告)号：JPH0912668A

    公开(公告)日：1997-01-14

    申请号：JP16876395

    申请日：1995-07-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MATSUZAKA YASUHIRO ,  MURATA NAOHIRO ,  ISHIKAWA KEIKO ,  TAKAYANAGI HIROSHI

    IPC: C08L75/04 ,  C08G18/00 ,  C08G18/10 ,  C08G18/65 ,  C08L75/00 ,  D01F6/70 ,  D06M13/02 ,  D06M13/325 ,  D06M13/328 ,  D06M15/564 ,  D06M101/00 ,  D06M101/16 ,  D06M101/30

    Abstract: PROBLEM TO BE SOLVED: To obtain a stable polyurethane soln. which is prevented from coloration and viscosity change even when a polar solvent with a high impurity content is used by reacting a prepolymer contg. an org. diisocyanate with a chain extender in a polar solvent in the presence of a specific compd. SOLUTION: In producing a polyurethane soln. by reacting a prepolymer formed from an org. diisocyanate and a straight-chain compd. having two active hydrogen atoms and a mol.wt. of 250-4,000 with a chain extender in a polar solvent or by reacting a mixture of a straight-chain compd. having two active hydrogen atoms and a mol.wt. of 250-4,000 and a chain extender with an org. diisocyanate in a polar solvent, the reaction is conducted in the presence of a hindered phenol (meth)acrylate represented by formula I [wherein R1 is a 1-4C alkyl; R2 and R3 are each a group represented by formula II (wherein R' is a 1-5C alkyl or phenyl); and R4 is H or methyl] in an amt. of 50-50,000ppm based on the nonvolatile components. Thus, a polyurethane soln. excellent in physical properties is obtd. even when a recovered polar solvent having a high impurity content is used, thus enabling the production of a molding having good physical properties.

    METHOD FOR CURING THERMOSETTING RESIN
    8.
    发明专利
    METHOD FOR CURING THERMOSETTING RESIN 失效

    公开(公告)号：JPH08176262A

    公开(公告)日：1996-07-09

    申请号：JP32041994

    申请日：1994-12-22

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MURATA NAOHIRO ,  MATSUZAKA YASUHIRO ,  TAKAYANAGI HIROSHI

    IPC: C08G18/02 ,  C08G18/18 ,  C08G18/63 ,  C08G18/64

    Abstract: PURPOSE: To increase the hardness of a cured thermosetting resin by reacting a carbodiimide compd. with an org. polyisocyanate compd. in the presence of a cure catalyst. CONSTITUTION: A thermosetting resin is cured by reacting an org. carbodiimide compd. with an org. polyisocyanate compd. in the presence of a cure catalyst. Examples of the polyisocyanate compd. are 2,4'-diphenylmethane diisocyanate and hexamethylene diisocyanate. The obtd. cured item has a pencil hardness higher than that of a cured copolycarbodiimide.

    PRODUCTION OF RIGID POLYURETHANE FOAM
    9.
    发明专利
    PRODUCTION OF RIGID POLYURETHANE FOAM 失效

    公开(公告)号：JPH0725978A

    公开(公告)日：1995-01-27

    申请号：JP17389693

    申请日：1993-07-14

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： NAGO TAKU ,  KANEDA TOSHIKAZU ,  WATANABE MINORU ,  MATSUZAKA YASUHIRO

    IPC: C08G18/72 ,  C08G18/76 ,  C08G101/00 ,  C08J9/14

    Abstract: PURPOSE:To obtain a rigid polyurethane foam excellent in dimensional stability and low smoking properties without using regulated chlorofluorocarbons by blending a specific organic polyisocyanate with a polyol, a foaming agent, a catalyst, a foam stabilizer and other assistants. CONSTITUTION:The objective polyurethane foam is obtained by bending (A) polyisocyanate composition prepared by mixing (i) a polymethylene polyphenylene polyisocyanate, expressed by formula (n is 0 or a positive integer) and containing 25-45wt.% diphenylmethane diisocyanate with 0.5-5.0wt.% one or two or more selected from (ii) a hydrocarbon having 20-80 deg.C boiling point, (iii) an ester and (iv) a hydrofluorocarbon with (B) a polyol, (C) a foaming agent, (D) a catalyst, (E) a foam stabilizer and (F) other assistants.

    POLYURETHANE SOLUTION, POLYURETHANE MOLDING, AND THEIR PRODUCTION
    10.
    发明专利
    POLYURETHANE SOLUTION, POLYURETHANE MOLDING, AND THEIR PRODUCTION 失效

    公开(公告)号：JPH0912671A

    公开(公告)日：1997-01-14

    申请号：JP16876695

    申请日：1995-07-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MATSUZAKA YASUHIRO ,  MURATA NAOHIRO ,  ISHIKAWA KEIKO ,  TAKAYANAGI HIROSHI

    IPC: C08L75/04 ,  C08G18/00 ,  C08G18/10 ,  C08G18/65 ,  C08L75/00 ,  D01F6/70 ,  D06M13/02 ,  D06M13/325 ,  D06M13/328 ,  D06M15/564 ,  D06M101/00 ,  D06M101/16 ,  D06M101/30

    Abstract: PROBLEM TO BE SOLVED: To obtain a stable polyurethane soln. which is prevented from coloration and viscosity change by reacting a mixture contg. a hydroxylic chain extender with an org. diisocyanate in a polar solvent in the presence of a specific compd. and a urethane-forming catalyst. SOLUTION: In producing a polyurethane soln. by reacting a mixture comprising a straight-chain compd. having two hydroxylic active hydrogen atoms and a mol.wt. of 250-4,000 and a hydroxylic chain extender with an org. diisocyanate in a polar solvent, the reaction is conducted in the presence of a urethane- forming catalyst and a one-side hindered phenol represented by the formula (wherein R1 and R2 are each a 1-10C satd. hydrocarbon group; and R3 is a 1-10C hydrocarbon group or an ether or thioether group). Thus, a polyurethane soln. can be produced without detriment to the productivity or merchandise value. though a chain extender having hydroxylic active hydrogen atoms is used. A molding obtd. by removing the solvent from the soln. has excellent physical properties and is suitable for producing a fiber or film.

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