Polyimides comprising substituted benzidines

Details Polyimides comprising substituted benzidines Polyimides comprising substituted benzidines

1989-07-20

1991-12-10

Welsh, Maurice J.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528172, 528173, 528174, 528176, 528188, 528220, 528229, 528350, 528351, 428395, 4284735, C08G 6926

Patent

active

050719971

ABSTRACT:
A new class of polyimides and copolyimides made from substituted benzidines and aromatic dianhydrides and other aromatic diamines. The polyimides obtained with said diamines are distinguished by excellent thermal, excellent solubility, excellent electrical properties such as very low dielectric constants, excellent clarity and mechanical properties making the polyimides ideally suited as coating materials for microelectronic apparatii, as membranes for selective molecular or gas separation, as fibers in molecular composites, as high tensile strength, high compression strength fibers, as film castable coatings, or as fabric components.

REFERENCES:
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patent: 4384107 (1983-05-01), Rogers et al.
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patent: 4461888 (1984-07-01), Rogers et al.
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patent: 4530993 (1985-07-01), Jinda et al.
patent: 4629777 (1986-12-01), Pfeifer
patent: 4921728 (1990-05-01), Takiguichi et al.
Rogers et al., "Highly Amorphous, Birefringent, Para-Linked Aromatic Polyamides", Macro., vol. 18, pp. 10-58-1068, 1985.

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