Title:
【発明の名称】スピロビインダンポリカーボネートの製造法及びその生成物及びそれから得られる製品
Document Type and Number:
Japanese Patent JP2655675
Kind Code:
B2
Abstract:
Homo- and copolycarbonates of spirobiindane bisphenols are prepared by first reacting phosgene with a substantially pure spirobiindane bisphenol in the presence of aqueous base in a heterogeneous medium at a pH in the range of about 9-11, and subsequently adding an interfacial polycarbonate formation catalyst and, optionally, a dihydroxyaromatic compound and a chain termination agent and continuing phosgene passage at a pH of at least about 10. By this method, there may be prepared homo- and copolycarbonates of 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1-spiro(bis)indane having high molecular weight. Said homopolycarbonates and copolycarbonates with bisphenol A may be used for manufacture of optical disks having low birefringence.
Inventors:
GARII REI FUARAA
JERII CHAARUZU RINCHI
JERII CHAARUZU RINCHI
Application Number:
JP9583088A
Publication Date:
September 24, 1997
Filing Date:
April 20, 1988
Export Citation:
Assignee:
JENERARU EREKUTORITSUKU CO
International Classes:
G02B1/04; C08G64/00; C08G64/06; C08G64/22; C08G64/24; G11B7/24047; G11B7/2534; (IPC1-7): C08G64/24; C08G64/06
Domestic Patent References:
| JP60127323A |
Attorney, Agent or Firm:
Tokunji Ikunuma