Method for making polybenzobisoxazole containing polymer

Details Method for making polybenzobisoxazole containing polymer Method for making polybenzobisoxazole containing polymer

2005-07-13

2008-12-16

Truong, Duc (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C528S487000, C528S335000, C528S336000, C528S341000, C528S422000, C528S503000, C528S272000

Reexamination Certificate

active

07465781

ABSTRACT:
A method of making polybenzobisoxazole containing polymer by use of a non-polybenzobisoxazole polymer, hydroxylating the polymer, forming a solidified polymer and heating the solidified polymer wherein ring closure occurs in the hydroxylated polymer.

REFERENCES:
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patent: 3869429 (1975-03-01), Blades
patent: 3869430 (1975-03-01), Blades
patent: 4423202 (1983-12-01), Choe
patent: 5883259 (1999-03-01), Kim et al.
Hsiao et al., “Synthesis and Properties of Aromatic Poly(o-hydroxy amide)s and Polybenzoxazoles Based on the Bis(ether benzoyl chloride)s from Hydroquinone and Its Methyl-tert-Butyl-, and Phenyl-Substituted Derivatives”, J. of Polymer Science, Polymer Chemistry Edition, vol. 37, No. 13 (1999), pp. 2129-2136.
Caruso et al., “Synthesis and Preliminary Characterization of a New Fully Aromatic Mesogenic Polyester Containing a 2-Phenylbenzoxazole Group”, Macromolecules, vol. 25 (1992), pp. 2290-2293.

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