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公开(公告)号：JPH05125169A
公开(公告)日：1993-05-21
申请号：JP29017791
申请日：1991-11-06
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU
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 Ni and/or Mo 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：JPH04332725A
公开(公告)日：1992-11-19
申请号：JP19896491
申请日：1991-05-08
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , OSHINO YASUHIRO
Abstract: PURPOSE:To obtain a polycarbonate having faint color and useful for injection molding at a low cost by carrying out the melt polycondensation of a bivalent hydroxy compound and a bisaryl carbonate in a reactor plated at the liquid- contacting part. CONSTITUTION:A polycarbonate is produced by the ester-interchange melt- polycondensation of a bivalent hydroxy compound (e.g. bisphenol A) and a bisaryl carbonate in the presence of an ester interchange catalyst (e.g. lithium borohydride). The reactor used in the above reaction has a liquid-contacting part plated with Cr or Ni or the reactor is made of a stainless steel and has a liquid-contacting part subjected to electrolytic polishing.
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公开(公告)号：JPH04106125A
公开(公告)日：1992-04-08
申请号：JP22323690
申请日：1990-08-24
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , KUWANA TAKAAKI
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 molten in a tank for melting feeds. In step 2, this mixture is polymerized on a horizontal twin-screw polymerizer to obtain a polycarbonate prepolymer of a viscosity-average molecular weight of 5000-30000. In step 3, the obtained prepolymer is received in at least one hold tank. In step 4, it is reacted on at least one paddle-type self-cleaning extruder to melt-polycondense components A and B by transesterification and to thereby obtain a polycarbonate of a viscosity-average molecular weight of 12000-60000.
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公开(公告)号：JPH047329A
公开(公告)日：1992-01-10
申请号：JP11089190
申请日：1990-04-25
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , FUKUDA YUTAKA
Abstract: PURPOSE:To obtain a lowly colored high-molecular weight polycarbonate by melt-polycondensing a dihydroxy compound with a bisaryl carbonate in a stainless steel reactor having a pickled liquid-contacting part. CONSTITUTION:A stainless steel reactor is charged with hydrochloric acid of a concentration of 40-45wt.% or an aqueous nitric acid solution of a concentration of 5-15wt.%, brushed at room temperature to 50 deg.C, washed with water and dried. A dihydroxy compound of any one of formulas I-IV (wherein R1 to R5 are each H, 1-8 C 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：JPH03265651A
公开(公告)日：1991-11-26
申请号：JP6562890
申请日：1990-03-16
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , SUGANO TATSUYA
Abstract: PURPOSE:To prepare the title compsn. improved in resistance to heat and hydrolysis by compounding an arom. polycarbonate polymer with a phosphite compd. and a hindered phenol compd. CONSTITUTION:An arom. polycarbonate polymer [e.g. a polymer obtd. from a dihydric compd. such as 2,2-bis(4-hydorxyphenyl)propane] is compounded with a phosphite compd. (e.g. a compd. of formula I) and a hindered phenol compd. [e.g. a compd. of formula II (wherein R is a 1-30C hydrocarbon group)] to give the title compsn., which is excellent in resistance to heat and hydrolysis and useful in many application areas as an engineering plastic.
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Patent Agency Ranking
公开(公告)号：JPH05148354A
公开(公告)日：1993-06-15
申请号：JP31473591
申请日：1991-11-28
Applicant: DAICEL CHEM
Inventor： OSHINO YASUHIRO , YAMATO TSUTOMU
Abstract: PURPOSE:To obtain a colorless transparent high-molecular polycarbonate without using any phosgene by effecting the melt polycondensation of a dihydroxy compound with a carbonic ester in the presence of a specified transesterification catalyst. CONSTITUTION:1mol of a dihydroxy compound of any one of formulas I-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) and 1.01-1.5mol of a carbonic diester are subjected to melt polycondensation at 100-300 deg.C in the presence of a transesterification catalyst comprising 10 to 10 mol, per mol of the, dihydroxy compound, of an electron-donating amine compound, 10 to 10 mol of an alkali (alkaline earth) metal compound and 10 to 10 mol of a phosphorus compound of any one of formulas V-IX (wherein R1 is a 1-30C hydrocarbon residue).
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公开(公告)号：JPH05125173A
公开(公告)日：1993-05-21
申请号：JP29303791
申请日：1991-11-08
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU
Abstract: PURPOSE:To efficiently obtain a polycarbonate having high molecular weight, free from coloring, 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 Cu and/or Al 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：JPH04122727A
公开(公告)日：1992-04-23
申请号：JP24148090
申请日：1990-09-12
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , FUKUDA YUTAKA
Abstract: PURPOSE:To obtain a high-molecular weight colorless and transparent polycarbonate by polymerizing further a polycarbonate prepolymer in the presence of an alkali (alkaline earth) metal. CONSTITUTION: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 10 -10 mol, per mol of the dihydroxy compound, of a transesterification catalyst to obtain a polycarbonate prepolymer of a viscosity-average molecular weight of 1000-30000. The prepolymer is further polymerized in the presence of 1X10 -1wt.% alkali (alkaline earth) metal compound (e.g. lithium borohydride).
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公开(公告)号：JPH0446928A
公开(公告)日：1992-02-17
申请号：JP15649590
申请日：1990-06-14
Applicant: DAICEL CHEM
Inventor： SUGANO TATSUYA , YAMATO TSUTOMU
Abstract: PURPOSE:To obtain a high-molecular weight, chloride-ion-free, colorless transparent polycarbonate without using any phosgene by melt-polycondensing a bisphenol with biphenyl carbonate in the presence of an electron-donating amine compound and an alkali (alkaline earth) metal compound catalyst. CONSTITUTION:A bisphenol [e.g. a compound of formula I, II, III or IV (wherein R1 to R4 are each H, 1-8 C alkyl or phenyl; X is halogen; (n) = 0-4; and (m) = 1-4)] is melt-polycondensed with biphenyl carbonate in the presence of an electron-donating amine compound (e.g. 2-methylimidazole) catalyst and an alkali metal compound (e.g. sodium acetate) or an alkaline earth metal compound (e.g. calcium carbonate). In this way, a high-molecular weight, substantially chloride ion-free, colorless transparent polycarbonate can be obtained without using any toxic phosgene.
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公开(公告)号：JPH03174443A
公开(公告)日：1991-07-29
申请号：JP31462089
申请日：1989-12-04
Applicant: DAICEL CHEM
Inventor： YAMATO TSUTOMU , FUKUDA YUTAKA
Abstract: PURPOSE:To prepare a colorless, transparent, high-mol. wt. polycarbonate substantially free from chlorine ion without using toxic phosgene by reacting a dialkyl carbonate with an arom. dihydroxy compd. in the presence of a specific transesterification catalyst. CONSTITUTION:A dialkyl carbonate is reacted with an arom. dihydroxy compd. in the presence of a transesterification catalyst comprising SbR1R2R3 or Sb2Xm (wherein R1, R2, and R3 are each alkyl, phenyl, alkoxy, or phenoxy; X is O or S; and m is 3 or 5). The dialkyl carbonate pref. releases a low-boilng alkyl group when forming a carbonate bond, and pref. if dimethyl carbonate obtd. from methanol, a cheap raw material. As the arom. dihydroxy compd., a compd. of formula I, II, III, or IV (wherein R1, R2, R3, and R4 are each H, 1-8C linear or branched alkyl, or phenyl; X is halogen; n is 0-4) is pref. A pref. transesterification catalyst is Sb2O3.
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