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公开(公告)号：JPH03160021A
公开(公告)日：1991-07-10
申请号：JP29935489
申请日：1989-11-17
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , FUKUDA YUTAKA
Abstract: PURPOSE:To obtain an essentially chloride ion-free, colorless, transparent, high- mol.wt. polycarbonate without using toxic phosgene by reacting a dialkyl carbonate with an aromatic dihydroxy compound in the presence of a specified transesterification catalyst. CONSTITUTION:A dialkyl carbonate is reacted with an aromatic dihydroxy compound in the presence of RmSnY4-m (wherein R is an alkyl group, a phenyl group, an alkoxyl group or a phenoxy group; Y is an acyloxy group such as acetyloxy or propionyloxy; and m is an integer of 0.4) as a transesterification catalyst. As the catalyst, (C4H9)3SnOOCCH3 which can give a high-mol.wt. polycarbonate of a colorless and transparent hue is desirable. Representative examples of the above aromatic dihydroxy compounds include compounds of formulas I, II, III and IV (wherein R1, R2, R3 and R4 are each a hydrogen atom, a 1-8 C linear or branched alkyl group or a phenyl group; and X is a halogen atom; and n = 0-4).
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公开(公告)号：JPH03131627A
公开(公告)日：1991-06-05
申请号：JP27110789
申请日：1989-10-18
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , FUKUDA YUTAKA
Abstract: PURPOSE:To obtain a high molecular weight polycarbonate of transparently colorless without containing chlorine ion nor toxic phosgene by reacting a dialkyl carbonate with an aromatic dihydroxy compound in the presence of a specific ester-interchange catalyst. CONSTITUTION:A dialkyl carbonate (e.g. dimethyl carbonate) is reacted with an aromatic dihydroxy compound (e.g. bisphenol-A) in the presence of a compound expressed by the formula MRn [M is alkali (earth) metal; n is 1 or 2; R is alkyl, phenyl, alkoxy or phenoxy] (preferably NaOCH3) as an ester- interchange catalyst to afford the aimed polycarbonate.
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公开(公告)号：JPH0288636A
公开(公告)日：1990-03-28
申请号：JP24169088
申请日：1988-09-27
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU
IPC: C08G65/46
Abstract: PURPOSE:To accomplish the title purification by filtering, grinding and granulating an aromatic polyether polymer mixture followed by extraction with a specific nonsolvent and then treatment in a mixed solution comprising aliphatic alcohol and ketone to remove byproduct salts, gel-like matter and reaction solvent to improve the bulk density of the polymer. CONSTITUTION:An aromatic polyether mixture comprising an aromatic polyether polymer, byproduct salts and reaction solvent is filtered through a filter pref. 1-100mum in mesh to remove the byproduct salts and the gel-like matter contained. The resultant mixture is then ground, granulated and then treated with a nonsolvent (e.g., methanol) completely soluble for the reaction solvent but insoluble for the polymer to extract said reaction solvent. The resultant crude polymer is further treated with a mixed solvent of aliphatic alcohol and ketone [pref. at the weight ratio (6:4)-(2:8)] to improve its bulk density, thus obtaining an aromatic polyether polymer pref. =0.3g/cc in bulk density, outstanding in heat resistance and mechanical properties and suitable for e.g., electrical and electronic equipment parts.
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公开(公告)号：JPH01263121A
公开(公告)日：1989-10-19
申请号：JP9195588
申请日：1988-04-14
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , KONDO MASAYOSHI
Abstract: PURPOSE:To efficiently provide the subject polymer having good heat resistance, moisture absorbing property and weather resistance, by grinding an aromatic polymer mixture in a non-solvent and heating the ground polymer mixture under reduced pressure at a temperature between the glass transition temperature, etc., of the polymer and the vapor pressure temperature of a reaction solvent to remove the non-solvent and the solvent. CONSTITUTION:4,4-Dihydroxydiphenyl sulfone, etc., is polycondensated with 4,4'-dichlorodiphenyl sulfone, etc., in the presence of potassium carbonate in a reaction solvent such as tetramethylene sulfone at 225 deg.C to provide an aromatic polymer such as an aromatic polyether sulfone. The resultant aromatic polymer mixture is ground in a non-solvent such as methanol and subsequently heated under reduced pressures within an operative temperature range 3 lower than the glass transition temperature 1 or melting point of the aromatic polymer mixture and higher than the temperature of the vapor pressure 2 of the reaction solvent to distill of the non-solvent and the reaction solvent, thereby purifying the aromatic polymer.
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公开(公告)号：JPH0649198A
公开(公告)日：1994-02-22
申请号：JP12701991
申请日：1991-03-13
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , KUWANA TAKAAKI
Abstract: PURPOSE:To efficiently produce a transparent, colorless high-molecular weight polycarbonate by subjecting a polycarbonate prepolymer obtd. in the former condensation step to the latter condensation step using a specific twin-screw extruder. CONSTITUTION:A polycarbonate having a viscosity-average mol.wt. of 12, 000--60, 000 is produced by subjecting a polycarbonate prepolymer having a viscosity-average mol.wt. of 5,000-20,000 and obtd. in the former condensation step to the latter condensation step using at least one paddle-type self-cleaning twin-screw extruder in the process for producing the polycarbonate by the melt polycondensation of a dihydroxy compd. with a bisaryl carbonate by transesterification. Formulas I and II (wherein R , R , and R are each H, 1-8C alkyl, or phenyl; X is halogen; and n is 0-4) show examples of the dihydroxy compd. Pref. mixing in the extruder is accelerated by revolving the paddles at different speeds.
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Patent Agency Ranking
公开(公告)号：JPH05140293A
公开(公告)日：1993-06-08
申请号：JP33408491
申请日：1991-11-21
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , SUGANO TATSUYA
Abstract: PURPOSE:To 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 Co and/or Cr. 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) and each 04; 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% Co and/or Cr, thus giving the objective high-mol.-wt. polycarbonate free from coloration.
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公开(公告)号：JPH05140290A
公开(公告)日：1993-06-08
申请号：JP30358491
申请日：1991-11-19
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , OKANO YOSHIMICHI
Abstract: PURPOSE:To produce a polycarbonate having an improved clarity by conducting the melt polycondensation of a dihydroxy compd. with a bisaryl carbonate in a reaction apparatus made of a specific material. CONSTITUTION:The melt polycondensation of a dihydroxy compd. of one of formulas I to IV (wherein R1 to R4 are each H, 1-8C linear or branched alkyl, or phenyl; X is halogen; (n) is 0-4; and (m) is 1-4) with a bisaryl carbonate is conducted at 100-300 deg.C in the presence of a transesterification catalyst consisting of an electron-donating amine compd. or consisting of the amine compd. and an alkali or alkaline earth metal compd. in a reaction apparatus made of a material contg. at least 60% Cu and/or Ni.
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公开(公告)号：JPH05125168A
公开(公告)日：1993-05-21
申请号：JP29017691
申请日：1991-11-06
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , KUWANA TAKAAKI
Abstract: PURPOSE:To efficiently obtain a high-molecular weight polycarbonate, excellent in transparency without coloring 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 composed 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 an ester interchange catalyst composed of an electron donative amine compound such as N,N-dimethyl-4-aminopyrine or the electron donative amine compound and an alkali (alkaline earth) metallic compound in a reactor using a material having the quantitative relationship of the composition constructed as the material composed of >=60% Ni and/or Al content. Thereby, the objective polycarbonate is obtained.
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公开(公告)号：JPH05117383A
公开(公告)日：1993-05-14
申请号：JP27740391
申请日：1991-10-24
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , OKANO YOSHIMICHI
Abstract: PURPOSE:To obtain a clear and colorless polycarbonate having high product stability by carrying out melt-polycondensation of a bivalent hydroxy compound with a bisaryl carbonate in the presence of an ester-interchange catalyst while controlling the amount of potassium in the system. CONSTITUTION:A clear and colorless polycarbonate having high product stability and a potassium content of
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公开(公告)号：JPH0517565A
公开(公告)日：1993-01-26
申请号：JP26336791
申请日：1991-07-08
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , KUWANA TAKAAKI
Abstract: PURPOSE:To obtain a polycarbonate not substantially containing impurities such as phenolic compounds by subjecting a bifunctional hydroxy compound and a biaryl carbonate to ester exchange to give a carbonate and purifying the carbonate with a specific compound. CONSTITUTION:A polycarbonate obtained by subjecting a bifunctional hydroxy compound and a biaryl carbonate to melt polycondensation by ester exchanging is purified with a compound shown by formula I (R1 and R2 are 1-6C alkyl or cycloalkyl). The purification is carried out by adding the compound of formula I to the polycarbonate, dissolving under heating, where the compounds shown by formula II to formula V (R1 to R5 are H, 1-8C alkyl or phenyl; X is halogen; (n) is 0-4; (m) is 1-4) are together used for the precipitation and granulation as the bifunctional hydroxy compound. Diphenyl carbonate is preferable as the disaryl carbonate.
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