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US 4,225,686 AGranted
Blends of copolyimides with copolyamideimides
AssigneeThe Upjohn Company
InventorsKemal B. Onder, Frank P. Recchia
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AssigneeThe Upjohn Company
InventorsKemal B. Onder, Frank P. Recchia
Estimating the term…
Novel polymer blends are disclosed comprising about 10 to 95 percent by weight of a copolyimide (A) prepared from benzophenone-3,3',4,4'-tetracarboxylic acid dianhydride and a mixture of 4,4'-methylenebis(phenyl isocyanate) and toluene diisocyanate (2,4- or 2,6-isomer or mixtures thereof) with the isocyanates used in a molar percent ratio from about 10/90 to 30/70 respectively; and from about 90 to 5 percent by weight of a copolyamideimide (B) prepared from 4,4'-methylenebis(phenyl isocyanate) and a mixture of trimellitic anhydride and isophthalic acid with the acid components used in a molar percent ratio from about 70/30 to 90/10 respectively. The novel blends may be used in the form of their dry blend or in solution and the films produced therefrom are characterized by improved elongation and tear strength values over those for the copolyimide (A) alone. Furthermore, the softening point of the blends is increased over the copolyamideimide alone.
A polymer blend comprising (A) from about 10 to about 95 percent by weight of a copolyimide having the recurring units ##STR10## wherein from about 10 to about 30 percent of said recurring units are those in which R represents ##STR11## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR12## and mixtures thereof;
A polymer blend comprising (A) from about 50 to about 80 percent by weight of a copolyimide having the recurring units ##STR19## wherein about 20 percent of said recurring units are those in which R represents ##STR20## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR21## and mixtures thereof;
A polymer solution comprised of a dipolar aprotic solvent and a solids content comprising (A) from about 10 to about 95 percent by weight of a copolyimide having the recurring units ##STR24## wherein from about 10 to about 30 percent of said recurring units are those in which R represents ##STR25## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR26## and mixtures thereof;
Dependencies are inferred from the claim text.