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公开(公告)号：JPH03265625A
公开(公告)日：1991-11-26
申请号：JP6562790
申请日：1990-03-16
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , SUGANO TATSUYA
Abstract: PURPOSE:To obtain a polycarbonate excellent in heat resistance, hydrolysis resistance and hue by adding a phosphite compound to a specified polycarbonate. CONSTITUTION:A phosphite compound desirably comprising a compound of the formula is added to a polycarbonate obtained by melt polycondensation through transesterification between a dihydroxy compound [e.g. 2,2-bis(hydroxyphenyl)-propane] and a bisaryl carbonate (e.g. diphenyl carbonate) in the presence of a transesterification catalyst (e.g. potassium borohydride).
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公开(公告)号：JPH0236228A
公开(公告)日：1990-02-06
申请号：JP18774388
申请日：1988-07-27
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , GOU HIROYUKI
IPC: C08G65/46
Abstract: PURPOSE:To obtain the subject polymer containing little by-product and residual reaction solvent by adding a mixture of aromatic polyether polymer to a volatile on-solvent, crushing the polymer simultaneous to precipitation and extracting the granulated polymer with a non-solvent. CONSTITUTION:The objective polymer is purified by removing by-products and reaction solvent from an aromatic polyether polymer mixture by the following procedures. The polymer mixture is added to a volatile solvent which is a non-solvent of said aromatic polyether polymer. The precipitated aromatic polymer is crushed simultaneous to precipitation and the granulated polymer is extracted with a non-solvent.
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公开(公告)号：JPH01319530A
公开(公告)日：1989-12-25
申请号：JP15268888
申请日：1988-06-21
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , NAKAJIMA NAOKI
Abstract: PURPOSE:To carry out the purification and separation of a polymer having low residual solvent content, uniform particle size and high bulk density, in high efficiency by cooling an aromatic polyether polymer mixture to form a precipitate, granulating the precipitate and removing by-products and reaction solvent from the granule. CONSTITUTION:A mixture composed of an aromatic polyether polymer, by- products (e.g., KCI) and reaction solvent (e.g., tetramethylene sulfone) is cooled to a temperature near the freezing point of the reaction solvent and the produced precipitate is granulated. The objective aromatic polyether polymer can be separated in purified state by removing the by-products and the reaction solvent from the granule. The obtained polymer has excellent heat-resistance and flame-retardance and is useful as a resin for the parts of electronic apparatus.
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公开(公告)号：JPH05140292A
公开(公告)日：1993-06-08
申请号：JP33408391
申请日：1991-11-21
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU
Abstract: PURPOSE:To produce a high-mol. -wt., clear and colorless polycarbonate by conducting the transesterification of a dihydroxy compd. with a carbonic diester under contact with a metallic material mainly comprising Al and/or Mn. CONSTITUTION:The transesterification of a dihydroxy compd. of formula I, II. or III (wherein R1, R2, R3, R4, R5, and R6 are each H, alkyl, cycloalkyl, aralakyl, or aryl; X1, X2, Y1, Y2, Y3, Z1, and Z2 are each halogen, alkoxy, alkyl, cycloalkyl, aralkyl, or aryl; (l), (m), (n), (p), (q), (r), and (s) are each 0-4; and (t) is 2-10) with a carbonic diester (e.g. diphenyl carbonate) is conducted under contact with a powdered, particulate, or ribbonlike metallic material contg. at least 50% Al and/or Mn, thus giving a high-mol. -wt. polycarbonate free from coloration.
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公开(公告)号：JPH05125174A
公开(公告)日：1993-05-21
申请号：JP29303891
申请日：1991-11-08
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , FUKUDA YUTAKA
Abstract: PURPOSE:To efficiently obtain a polycarbonate having high molecular weight, free from coloration, having excellent transparency and suitable for injection molding, etc., by polycondensing a dihydric hydroxy compound with a bisaryl carbonate in the presence of a catalyst in a reactor consisting of a specific material. CONSTITUTION:A dihydric hydroxy compound such as 2,2-bis-(4-hydroxyphenyl) propane is polycondensed with a bisaryl carbonate such as diphenyl carbonate in the presence of a transesterification catalyst consisting of an electron donative amine compound such as N,N-dimethyl-4-aminopyridine or the electron donative amine compound and alkali (alkaline earth) metal compound in a reactor using a material whose Cu and/or Zn content is >=60% in quantitative relationship of the composition constituted as the material to provide the objective polycarbonate.
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Patent Agency Ranking
公开(公告)号：JPH05125172A
公开(公告)日：1993-05-21
申请号：JP29017891
申请日：1991-11-06
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , OSHINO YASUHIRO
Abstract: PURPOSE:To efficiently obtain a polycarbonate having high molecular weight, free from coloration, having excellent transparency and suitable for injection molding, etc., by polycondensing a dihydric hydroxy compound with a bisaryl carbonate in the presence of a catalyst in a reactor consisting of a specific material. CONSTITUTION:A dihydric hydroxy compound such as 2,2-bis-(4-hydroxyphenyl) propane is polycondensed with a bisaryl carbonate such as diphenyl carbonate in the presence of a transesterification catalyst consisting of an electron donative amine compound such as N,N-dimethyl-4-aminopyridine or the electron donative amine compound and alkali (earth) metal compound in a reactor using a material whose Cr and/or Ni content is >=60% in quantitative relationship of the composition constituted as the material to provide the objective polycarbonate.
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公开(公告)号：JPH05125170A
公开(公告)日：1993-05-21
申请号：JP29303991
申请日：1991-11-08
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU
IPC: C08G64/20
Abstract: PURPOSE:To efficiently obtain a polycarbonate having high molecular weight, free from coloration, having excellent transparency and suitable for injection molding, etc., by polycondensing a dihydric hydroxy compound with a bisaryl carbonate in the presence of a catalyst in a reactor consisting of a specific material. CONSTITUTION:A divalent hydroxy compound such as 2,2-bis-(4-hydroxyphenyl) propane is polycondensed with a bisaryl carbonate such as diphenyl carbonate in the presence of a transesterification catalyst consisting of an electron donative amine compound such as N,N-dimethyl-4-aminopyridine or the electron donative amine compound and an alkali (earth) metal compound in a reactor using a material whose Ni and/or C content is >=60% in quantitative relationship of the composition constituted as the material to provide the objective polycarbonate.
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公开(公告)号：JPH04106126A
公开(公告)日：1992-04-08
申请号：JP22323790
申请日：1990-08-24
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , OSHINO YASUHIRO
Abstract: PURPOSE:To produce a polycarbonate having a high molecular weight and improved colorlessness, transparency and production efficiency by melt- polycondensing a dihydroxy compound with a bisaryl carbonate by transesterification in four specified steps. CONSTITUTION:In step 1, a monomer mixture comprising a dihydroxy compound (A) and a bisaryl carbonate (B) is polycondensed in a molten state in at least one tank-type reactor to obtain a polycarbonate prepolymer of a viscosity- average molecular weight of 5000-20000. In step 2, this prepolymer is received in at least one hold tank, step 3, it is polycondensed in a vented extruder to obtain a polycarbonate of a viscosity-average molecular weight of 10000-30000 while the distillate such as the phenol formed by the reaction is removed. In step 4, this polycarbonate is treated in at least one paddle-type self-cleaning twin-screw extruder to melt-polycondense components A and B by transesterification to thereby obtain a polycarbonate of a viscosity-average molecular weight of 10000-30000.
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公开(公告)号：JPH047328A
公开(公告)日：1992-01-10
申请号：JP11089090
申请日：1990-04-25
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , OSHINO YASUHIRO
Abstract: PURPOSE:To obtain a lowly colored high-molecular weight polycarbonate by melt-polycondensing a dihydroxy compound with a bisaryl carbonate in a reactor having an inside wall made of buffed stainless steel. CONSTITUTION:The inside wall of a stainless steel reactor is buffed with a buffing compound having a grain size of 80mum or below. A dihydroxy compound of any one of formulas I-IV (wherein R1 to R5 are each H, 1-8C linear or branched alkyl or phenyl; X is halogen, (n) is 0-4; and (m) is 1-4) is melt- polycondensed with a bisaryl carbonate at 100-300 deg.C in the presence of a transesterification catalyst (e.g. lithium borohydride) in the reactor.
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公开(公告)号：JPS6443524A
公开(公告)日：1989-02-15
申请号：JP19955987
申请日：1987-08-10
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , NAKATANI TOSHIO
IPC: C08G65/46
Abstract: PURPOSE:To obtain the title high-bulk density polymer efficiently, by treating an aromatic polyether polymer mixture left after removing by-products and the reaction solvent from the reaction mixture with a specified mixed solvent. CONSTITUTION:A mixed solvent (B) is obtained by mixing an aliphatic alcohol (a) (e.g., methanol) with a ketone (b) (e.g., acetone) at a ratio of 8-1:2-9. Reaction by-products and the reaction solvent are removed from an aromatic polyether polymer mixture (A), and 5-20pts.wt., per pt.wt. component A, component B is added to the residue. The resulting mixture is agitated at a temperature lower than any of the boiling points of components (a) and (b), preferably at room temperature - 50 deg.C.
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