Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2006-03-28
2006-03-28
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C528S125000, C528S126000, C528S128000, C528S172000, C528S173000, C528S176000, C528S179000, C528S183000, C528S188000, C528S220000, C528S229000, C528S350000, C528S353000, C525S420000, C525S422000, C428S411100, C428S357000, C428S394000, C428S395000, C428S396000, C428S473500
Reexamination Certificate
active
07019103
ABSTRACT:
A terminal-crosslinkable polyamic acid oligomer having 1) heat resistance indicated by Tg of 300° C. or more and a pyrolysis temperature of 500° C. or more, 2) toughness, and 3) capability of allowing an increase in concentration. The polyamic acid oligomer is obtained by reacting an aromatic tetracarboxylic dianhydride including 2,2′,3,3′-biphenyltetracarboxylic dianhydride, an aromatic diamine compound, and a reactive crosslinking agent including an amino group or acid anhydride group and a crosslinkable group in the molecule, and includes a crosslinkable group at the molecular terminal.
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J. A. Johnston, et al. “Synthesis and Characterization of Imide Oligomers End-Capped with 4-(Phenylethynyl)Phthalic Anhydrides”, POLYMER, vol. 35, No. 22, 1994, pp. 4865-4873.
Goto Kohei
Ozawa Hideki
Yokota Rikio
Hampton Hightower P.
JSR Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ube Industries Ltd.
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