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
2006-04-04
2006-04-04
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S153000, C525S328600, C525S330700, C525S534000, C525S539000, C528S125000, C528S176000, C528S191000, C528S401000, C528S421000, C428S423700
Reexamination Certificate
active
07022772
ABSTRACT:
The present invention refers to a polymeric optical film the polymer of the polymeric optical film consisting essentially of one or more polyarylates having repeating units represented by the general structure:wherein A represents one or more different bisphenolfluorene radicals having the general formula (I):wherein R1and R2independently represent an alkyl group, a halogen atom, an alkoxy group, an acyl group, a phenyl group or a nitrile group, with the proviso that R1and R2are not both an alkyl group; R3, R4, R5and R6represent a hydrogen atom, an alkyl group, a halogen, an alkoxy group, an acyl group, a phenyl group, a nitro group, or a nitrile group, with the proviso that when R1and R2are both bromide atoms, at least one of R3, R4, R5and R6is different from hydrogen atom;B represents one or more different dicarboxy radicals having the formula:wherein X is a divalent aromatic hydrocarbon group having from 6 to 20 carbon atoms, and n is the number of the repeating units which build up the polymer and is a positive integer higher than 20.The optical film of the present invention has excellent mechanical and thermal properties, a high Tg and does not readily yellow upon exposure to light.
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Journal of Applied Polymer Science, vol. 29, pp. 35-43; (1984).
Angiolini Simone
Avidano Mauro
Bracco Roberto
Salvarani Paolo
Ferraria Technologies S.p.A.
Mark A. Litman & Assoc. P.A.
Truong Duc
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