Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2008-04-15
2008-04-15
Boykin, Terressa (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C525S439000, C528S198000, C556S418000, C556S437000
Reexamination Certificate
active
07358321
ABSTRACT:
A copolycarbonate is discloses, comprising units of the formula (1)wherein 70 to 99.5 mole percent of the total number of R1groups are derived from a dihydroxy compound of formula (2)wherein R2and R3are each independently a halogen or a C1-6alkyl group, R4is a methyl or a phenyl group, and c is independently 0 to 4; and 0.5 to 30 mole percent of the total number of R1groups are derived from a dihydroxy compound of formula (3)in-line-formulae description="In-line Formulae" end="lead"?HO—R5—OH (3)in-line-formulae description="In-line Formulae" end="tail"?wherein at least 60% of the R5groups are aromatic, and the dihydroxy compound of formula (3) is not the same as the dihydroxy compound of formula (2), and wherein the copolycarbonate has a glass transition temperature of 250° C. or higher.
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Gurel Emine Elif
Mahood James A.
Boykin Terressa
General Electric Company
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