Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1998-08-07
2000-03-28
Evans, Elizabeth
Stock material or miscellaneous articles
Circular sheet or circular blank
428 644, 428412, 428913, 43027011, 4304951, 430945, 369288, 528 86, 528193, 528196, 528204, 528206, 528219, 528271, B32B 300
Patent
active
060429208
ABSTRACT:
Copolycarbonates comprise structural units derived from a bisphenol such as bisphenol A, a spiro(bis)indane bisphenol such as 6,6'-dihdyroxy-3,3,3',3'-tetramethyl-1,1'-spiro(bis)indane and a polyoxyalkylene glycol such as polyethylene glycol. These copolycarbonates have high processability and are expected to have low birefringence. They are useful for the fabrication of optical disks.
REFERENCES:
patent: Re34431 (1993-11-01), Brunelle et al.
patent: 4789725 (1988-12-01), Guggenheim et al.
patent: 5859833 (1999-01-01), Chatterjee et al.
patent: 5883218 (1999-03-01), Gordon et al.
Chatterjee Gautam
King, Jr. Joseph Anthony
LeGrand Donald George
Varadarajan Godavarthi Satyanarayana
Evans Elizabeth
General Electric Company
Johnson Noreen C.
Stoner Douglas E.
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