Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1994-07-21
1996-06-25
Dean, Jr., Ralph H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 26, 528 29, 525464, C08G 77448
Patent
active
055300839
ABSTRACT:
A method is provided for making silicone polycarbonate block copolymers and polycarbonate blends thereof having reduced haze. Silicone polycarbonate block copolymer formation is effected by using a phase transfer catalyst to generate polycarbonate oligomers having at least one terminal haloformate group followed by the late addition of hydroxyaryl terminated polydiorganosiloxane.
REFERENCES:
patent: 4600632 (1986-07-01), Paul et al.
patent: 4732949 (1988-03-01), Paul et al.
patent: 5100960 (1992-03-01), Grigo et al.
Boden Eugene P.
Davis Gary C.
Hoover James F.
Joyce Danielle R.
Phelps Peter D.
Dean Jr. Ralph H.
General Electric Company
Pittman William H.
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