JPS57131225A - Purification of polycarbonate solution - Google Patents

Purification of polycarbonate solution

Info

Publication number
JPS57131225A
JPS57131225A JP1690881A JP1690881A JPS57131225A JP S57131225 A JPS57131225 A JP S57131225A JP 1690881 A JP1690881 A JP 1690881A JP 1690881 A JP1690881 A JP 1690881A JP S57131225 A JPS57131225 A JP S57131225A
Authority
JP
Japan
Prior art keywords
diatomaceous earth
polycarbonate solution
solution
filter layer
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP1690881A
Other languages
Japanese (ja)
Other versions
JPS6340210B2 (en
Inventor
Masayoshi Miyauchi
Koji Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teijin Ltd
Original Assignee
Teijin Chemicals Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teijin Chemicals Ltd filed Critical Teijin Chemicals Ltd
Priority to JP1690881A priority Critical patent/JPS57131225A/en
Publication of JPS57131225A publication Critical patent/JPS57131225A/en
Publication of JPS6340210B2 publication Critical patent/JPS6340210B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Processes Of Treating Macromolecular Substances (AREA)
  • Polyesters Or Polycarbonates (AREA)

Abstract

PURPOSE: To obtain a color-free highly purified polycarbonate solution capable of providing thermally stable moldings, by further filtering a polycarbonate solution which has been free from water-soluble impurities through a diatomaceous earth-containing filter layer.
CONSTITUTION: A polycarbonate solution is produced, for example, by a method comprising reacting a dihydroxydiarylalkane with phosgene, and the impurities are removed, for example, by a method including washing of the solution with an aqueous washing liquid. Then, the purpose highly purified polycarbonate solution is obtained by adjusting the viscosity of the polycarbonate solution to below about 300cP and feeding and passing the solution through a filter layer usually containing above 10% diatomaceous earth. As the filter layer containing diatomaceous earth, there is used a filter medium consisting of a combination of diatomaceous earth and cellulose or a filter layer containing diatomaceous earth as a filter acid.
COPYRIGHT: (C)1982,JPO&Japio
JP1690881A 1981-02-09 1981-02-09 Purification of polycarbonate solution Granted JPS57131225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1690881A JPS57131225A (en) 1981-02-09 1981-02-09 Purification of polycarbonate solution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1690881A JPS57131225A (en) 1981-02-09 1981-02-09 Purification of polycarbonate solution

Publications (2)

Publication Number Publication Date
JPS57131225A true JPS57131225A (en) 1982-08-14
JPS6340210B2 JPS6340210B2 (en) 1988-08-10

Family

ID=11929229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1690881A Granted JPS57131225A (en) 1981-02-09 1981-02-09 Purification of polycarbonate solution

Country Status (1)

Country Link
JP (1) JPS57131225A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6424829A (en) * 1987-07-21 1989-01-26 Mitsubishi Gas Chemical Co Polycarbonate molding material for optical disc
JP2003026792A (en) * 2001-07-16 2003-01-29 Teijin Chem Ltd Process for producing purified polycarbonate resin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6424829A (en) * 1987-07-21 1989-01-26 Mitsubishi Gas Chemical Co Polycarbonate molding material for optical disc
JP2003026792A (en) * 2001-07-16 2003-01-29 Teijin Chem Ltd Process for producing purified polycarbonate resin

Also Published As

Publication number Publication date
JPS6340210B2 (en) 1988-08-10

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