Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-03-28
1991-02-19
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525462, 528204, C08G 6442, C08G 6418, C08G 6408
Patent
active
049945335
ABSTRACT:
A method for preparing novel poly(aryl ether)-(poly aryl carbonate) block copolymers by the decarboxylation of copolycarbonates prepared by the condensation of two different aromatic dihydroxy compounds and a carbonate precursor such as phosgene. At least one of the aromatic diols must have at least one electron-withdrawing group located in a position ortho or para to at least one of its hydroxy groups and at least one of the diols must not have any electron-withdrawing groups in a position ortho or para to either of its hydroxy groups. The method is particularly effective in making crystalline block copolymers.
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Bales Stephen E.
Crain Steven P.
Mullins Michael J.
Murray Daniel J.
Woo Edmund P.
Bleutge John C.
Buttner David
The Dow Chemical Company
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