Rapid advancement of molecular weight in polybenzazole oligomer

Details Rapid advancement of molecular weight in polybenzazole oligomer Rapid advancement of molecular weight in polybenzazole oligomer

1990-10-19

1992-02-18

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528172, 528179, 528184, 528207, 528208, 528210, 528211, C08G 7500, C08G 6300, C08G 6306

Patent

active

050895915

ABSTRACT:
Polybenzazole polymers can be advanced rapidly to high molecular weight at relatively high temperatures and high shear in a dehydrating solvent acid.

REFERENCES:
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patent: 4578432 (1986-03-01), Tsai
patent: 4608427 (1986-08-01), Sweeney
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patent: 4820793 (1989-04-01), Imai
patent: 4845183 (1989-07-01), Mueller
patent: 4847350 (1989-07-01), Harris
patent: 4900805 (1990-02-01), Arnold
patent: 4948867 (1990-08-01), Nishino
Wolfe et al., "Rigid-Rod Polymers 1, Synthesis and Thermal Properties of Para-Aromatic Polymers with 2,6-Benzobisoxazole Units in the Main Chain," 14 Macromolecules 909 (1981).
Wolfe et al., "Rigid-Rod Polymers 2, Synthesis and thermal Properties of Para-Aromatic Polymers with 2,6-Benzobisthiazole Units in the Main Chain," 14 Macromolecules 915 (1981).

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