US 6,333,394 B1Granted

Copolycarbonate preparation by solid state polymerization

AssigneeGeneral Electric Company

InventorsChristian Maria Emile Bailly, Bhaskar Bhairavnath Idage, Swaminathan Sivaram, Nayaku Nivarati Chavan, Rein Mollerus Faber, Shamal Karunakaran Menon, Gautam Chatterjee, Godavarthi Satyana Varadarajan, James Day, Patrick Joseph McCloskey, Joseph Anthony King, Jr., Arun Savalaram Jadhav

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Abstract

Copolycarbonates containing such structural units as birefringence-reducing or “soft block” units are prepared by conducting a reaction, such as melt polymerization or equilibration, between a precursor polycarbonate and a monomer, polycarbonate oligomer or high molecular weight polycarbonate which is a source of other structural units. The crystallinity of the resulting precursor copolycarbonate or one of the reagents employed in its preparation is enhanced and the precursor copolycarbonate is subjected to solid state polymerization.

Claims29

Dependent claims

A method for preparing a copolycarbonate which comprises:

(I) contacting (A) a precursor polycarbonate with (B) a monomeric or polymeric source of structural units having structural features different from those present in component A, which are to be incorporated in the copolycarbonate, said contact being under conditions promoting reaction of components A and B with incorporation of the structural units in component B to form a precursor copolycarbonate;
(II) converting component A, component B or said precursor copolycarbonate to a polycarbonate of enhanced crystallinity, either prior to or following step I;
and
(III) subjecting said copolycarbonate of enhanced crystallinity to solid state polymerization, following step II and either concurrently with or following step I.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/379,234Filed 23 Aug 1999 · continuation in part
Priority: 9 Aug 1999
Granted: 25 Dec 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08G 64/20
Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule: general preparatory processes
C08G 64/14
Not containing aliphatic unsaturation: containing a chain-terminating or -crosslinking agent
C08G 64/183
Block or graft polymers: containing polyether sequences
C08G 64/307
Using carbonates: and phenols