Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2011-08-16
2011-08-16
Seidleck, James (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S368000, C525S418000
Reexamination Certificate
active
07999060
ABSTRACT:
A tailorable polyimide prepolymer blend comprising an end group component, a dianhydride component, and a diamine component. The dianhydride component includes at least 3,4,3′,4′-benzophenonetetracarboxylic dianhydride (BTDA), derivatives thereof, or combinations thereof, and 3,4,3′,4′-biphenyltetracarboxylic dianhydride (BPDA), derivatives thereof, or combinations thereof. The diamine component includes at least 1,3-phenylenediamine (mPDA), derivatives thereof, or combinations thereof; 1,4-phenylenediamine (pPDA), derivatives thereof, or combinations thereof; bis amino phenoxy benzene (APB), derivatives thereof, and combinations thereof; and optionally, 4,4′-(1,3-phenylene-bis(1-methylethylidene)bisaniline (Bis-M), derivatives thereof, and combinations thereof. A cured polyimide matrix has a glass transition temperature of at least about 450° F. (232° C.). An article formed from the tailorable polyimide prepolymer blend may be a powder, a neat resin, a coating material, a film, an adhesive, a fiber, a composite, a laminate, a prepreg, a part, and combinations thereof.
REFERENCES:
patent: 5115087 (1992-05-01), Sheppard et al.
patent: 5708128 (1998-01-01), Oikawa et al.
patent: 6184333 (2001-02-01), Gray
Ronk Warren
Shafer Lisa
General Electric Company
General Electric Company
Listvoyb Gregory
Louke Marcella R.
Seidleck James
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