Tert-butylhydroquinone polycarbonates

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

Reexamination Certificate

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Details

C156S325000, C156S327000, C428S354000, C428S411100, C428S412000, C525S067000, C528S196000, C528S198000

Reexamination Certificate

active

07629432

ABSTRACT:
The present invention relates to polycarbonate having repeat units derived from tert-butylhydroquinone (TBHQ). It has herein been found that polycarbonate having repeat units derived from TBHQ has superior properties as compared to polycarbonate having repeat units derived from other dihydroxy (hydroquinone-type) compounds. In one embodiment the present invention provides a polycarbonate having repeat units derived from tert-butylhydroquinone. The polycarbonate has a Mw (PC) of at least 9,000 g/mol.

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patent: 2008/0004426 (2008-01-01), Brack et al.
patent: 2009/0088538 (2009-04-01), Campman et al.
patent: 3269017 (1991-11-01), None
patent: 00/47679 (2000-08-01), None
Brunelle et al., Preparation of Crystalline and Solvent Resistant Polycarbonates Via Ring-Opening Polymerization of Cyclic Oligomers, Macromol Symposium, 1994, pp. 117-124, Huthig & Wepf Verlag, Basel.
Brunelle, Daniel J., Solvent-resistant Polycarbonates, Trends in Polymer Science, May 1995, pp. 154-158, vol. 3, No. 5.
Brunelle et al., “Preparation of Crystalline and Solvent Resistant Polycarbonates Via Ring-Opening Polymerization of Cyclic Oligomers”, Polymer Preprints, American Chemical Society, US, 1993, vol. 34, No. 1, pp. 73-74.

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