초록 ▼

Polyamide-imide compositions, including amic acid precursors thereto, having in their molecules recurring units based on aromatic tri- and tetracarbonyl moieties joined by a bisphenoxyphenyl structure exhibit a desirable combination of chemical, mechanical and thermal properties and retention of the

Polyamide-imide compositions, including amic acid precursors thereto, having in their molecules recurring units based on aromatic tri- and tetracarbonyl moieties joined by a bisphenoxyphenyl structure exhibit a desirable combination of chemical, mechanical and thermal properties and retention of these properties on exposure to elevated temperatures even after saturation with water.

대표청구항 ▼

A polyamide-imide composition comprising recurring units corresponding to the formula [Figure] [Figure] wherein each of the A and B moieties is independently [Figure] or [Figure] [Figure] with →denoting isomerism and Ar being a tetravalent aromatic radical having each carboxyl group ortho to one oth

A polyamide-imide composition comprising recurring units corresponding to the formula [Figure] [Figure] wherein each of the A and B moieties is independently [Figure] or [Figure] [Figure] with →denoting isomerism and Ar being a tetravalent aromatic radical having each carboxyl group ortho to one other carboxyl group; each Y is independently halogen or C1-6 alkyl; each n is independently an integer of 0 to 4, inclusive; and each X is independently a meta- or para-disposed stable linkage free of sulfone and amide groups, the A and B moieties of said composition providing about 5 to about 95 mole % (1) and about 95 to about 5 mole % (2) based on total moles of (1) and (2).