Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-03-22
2005-03-22
Peng, Kuo-Liang (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C528S025000, C528S196000
Reexamination Certificate
active
06870013
ABSTRACT:
Copolyorganosiloxanecarbonates are prepared by first preparing an oligomeric aromatic polycarbonate, such as an oligomeric bisphenol A polycarbonate, in the presence of a tertiary amine as the only catalyst species; contacting the oligomeric polycarbonate mixture with a polyorganosiloxane bis(aryl)chloroformate, such as the bischloroformate of hydroxy-terminated eugenol polydimethylsiloxane; and introducing phosgene and/or chain termination agent either continuously or in stages. A feature of the process is the presence of dihydroxyaromatic compound in only one charge, at the beginning. The products have excellent physical properties, including transparency.
REFERENCES:
patent: 5530083 (1996-06-01), Phelps et al.
patent: 5616674 (1997-04-01), Michel et al.
patent: 6492481 (2002-12-01), Davis et al.
Dardaris David Michel
Davis Gary Charles
Silva James Manio
Caruso Andrew J.
General Electric Company
Patnode Patrick K.
Peng Kuo-Liang
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