The present invention relates to a method for preparing poly(carbonate-etherimide) compound comprising polycarbonate segment as shown in the structure (A) and polyetherimide segment as shown in the structure (B). Said method does not contain a highly toxic phosgene in its operation, can be performed easily, and can be operated at not high temperature. wherein R.sub.1 represents aromatic with 6 to 30 carbon atoms or, optionally said aromatic is bonded with heteroatom; R.sub.2 represents aromatic with 6 to 30 carbon atoms or, optionally said aromatic is bonded with heteroatom; m is an integer from 1 to 15; and n is an integer from 1 to 10. ##STR00001##

A process for the purification of an oxydiphthalic anhydride includes contacting a mixture of an oxydiphthalic anhydride and at least one of the corresponding oxydiphthalic diacid, a corresponding oxydiphthalic tetraacid, a halophthalic anhydride, and a catalyst with a solvent to provide a slurry. The solvent is capable of solubilizing the corresponding oxydiphthalic diacid, the corresponding oxydiphthalic tetraacid, the halophthalic anhydride, and the catalyst at a temperature of 15 to 50 C., and the oxydiphthalic anhydride is substantially insoluble in the solvent at this temperature. The oxydiphthalic anhydride can be isolated from the slurry. A purified oxydiphthalic anhydride and a polyetherimide prepared therefrom are also disclosed.

A method for producing an aqueous polyimide precursor solution composition includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in an aqueous solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

The present disclosure relates to a method for producing a polyimide film. The method includes: providing a polyamic acid copolymer including at least a semi-aromatic polyamic acid obtained by reacting cyclobutane-1,2,3,4-tetracarboxylic (CBDA) with an aromatic cyclic diamine; and adding dehydrating agent and a pyridine catalyst having an ortho substituent into the polyamic acid copolymer to carry out a chemical imidization reaction of the polyamic acid copolymer to prepare a polyimide film.

The present invention provides a polyimide film and a manufacturing method therefor, wherein the polyimide film satisfies the following equation (1) as measured for dimensional change by a thermomechanical analyzer (TMA) undergoing a temperature elevation process from 25 C. to 400 C. and then a cooling process from 400 C. to 25 C. Equation (1) dimensional measurement in TD direction (cooling, 50 C.)dimensional measurement in TD direction (temperature elevation, 50 C.)<0 m.

A transparent polyimide film with low birefringence, high glass transition temperature (T.sub.g) consists of polyimide essentially comprising non-linear structure. This polyimide is prepared by a mixture of dianhydrides and diamines, comprising at least 10 mol % of asymmetric dianhydride and 50 mol % or less of meta-substituted diamine. This transparent polyimide film has a transmittance of 85% or more at 550 nm, a birefringence value of 0.005 or less and a T.sub.g of 300 C. or more. The present invention relates to the low birefringence required electro-optic field, including the substrate and cover window for flexible OLED and LCD displays.

A method of making a polyetherimide comprising reacting a diamine having four bonds or more between the amine groups, 3,3-bisphenol A dianhydride, and 4,4-bisphenol A dianhydride to form a polyetherimide having a cyclics content less than 1 weight percent (wt %), a glass transition temperature greater than or equal to 213 C., and a weight average molecular weight greater than or equal to 25,000 Daltons, wherein the molar ratio of 3,3-bisphenol A dianhydride to 4,4-bisphenol A dianhydride is 98:02 to 10:90.

Provided is a polyimide resin composition and a production method thereof, wherein the polyimide resin composition contains an alicyclic polyimide resin having a structural unit represented by the following general formula (1) and inorganic particles of at least one selected from the group consisting of titanium dioxide, barium titanate, and zirconium oxide, wherein the alicyclic polyimide resin has a glass transition temperature of 260 C. or higher,

##STR00001## wherein R.sub.1 represents a tetravalent alicyclic hydrocarbon group having a carbon number of from 4 to 22, and R.sub.2 represents a divalent aliphatic hydrocarbon group having a carbon number of from 2 to 28 and/or a divalent aromatic hydrocarbon group having a carbon number of from 6 to 27.

A method of manufacture of a polyetherimide composition includes contacting a substituted phthalic anhydride and an organic diamine in the presence of diphenyl sulfone, sulfolane, or a combination comprising at least one of the foregoing solvents at a temperature of greater than 130 C. to provide a bis(phthalimide) composition comprising diphenyl sulfone, sulfolane, or a combination comprising at least one of the foregoing solvents and a bis(phthalimide); and polymerizing the bis(phthalimide) and an alkali metal salt of a dihydroxy aromatic compound in the presence of diphenyl sulfone, sulfolane, or a combination comprising at least one of the foregoing to form a polyetherimide. The method does not require any catalyst either for the imidization or the polymerization.

This application provides a resin composition and an adhesive. The resin composition is composed of benzoxazine and a resin. The benzoxazine is synthesized from a primary amine-capped flexible polyimide oligomer, an aldehyde and a monofunctional phenolic compound. The resin contains one or more of an epoxy resin, a maleimide resin, and a cyanate ester resin containing two or more functional groups. The resin is 0.1%-70% by weight of the benzoxazine.