The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300° C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.

In a first aspect, a coated film includes a polyimide film, a curable resin coating composition and an adhesion-promoter. The curable resin coating composition includes a curable oligomer and first nanoparticles. The adhesion-promoter includes a polyamic acid composition and is on a surface of the polyimide film that is in contact with the curable resin coating composition. In a second aspect, an electronic device includes the coated film of first aspect.

In a first aspect, a coated film includes a polyimide film, a curable resin coating composition and an adhesion-promoter. The curable resin coating composition includes a curable oligomer and first nanoparticles. The adhesion-promoter includes a polyamic acid composition and is on a surface of the polyimide film that is in contact with the curable resin coating composition. In a second aspect, an electronic device includes the coated film of first aspect.

A polymeric lyotropic liquid crystal solution comprises a birefringent aromatic polymer. A linear polarizer layer is obtained by shear-coating the polymeric lyotropic liquid crystal solution on a coatable substrate, and treating the resulting coating layer with a doping-passivation solution containing iodine and multi-valent cations. A linear polarizer includes a birefringent coating layer of 1.0 micrometers or less in thickness, and contains birefringent aromatic polymer, iodine anions, and multi-valent cations. An optical article includes an optical retarder layer of 1.0 micrometers or less in thickness and a linear polarizer layer of 1.0 micrometers or less in thickness, with an intermediate layer between the linear polarizer layer and the optical retarder layer. The optical retarder layer contains a first birefringent aromatic polymer generally aligned along a first alignment direction and the linear polarizer layer contains a second birefringent aromatic polymer generally aligned along a second alignment direction, with an angle between the first alignment direction and the second alignment direction in a range of 40° to 50°.

A simple method for removing foreign substances that are formed on a substrate during a semiconductor device production process and a composition for forming a coating film for foreign substance removal, said coating film being used in the above-described method. A composition for forming a coating film for foreign substance removal, said composition containing a polymer and a solvent and being capable of forming a coating film that dissolves in a developer liquid, wherein: the polymer is selected from among phenolic novolacs, polyhydroxystyrene derivatives and carboxylic acid-containing polymers; and the polymer is contained in an amount of 50% by mass or more relative to the total solid content in the composition.

Provided is a composition for interfacial polymerizing polyamide including an amine compound; and one or more types of compounds selected from among a purine-based compound and a pyrimidine-based compound of Chemical Formula 1: ##STR00001## wherein, in Chemical Formula 1: X is N or NH; Y is O or OH; Z is O, OH or NH.sub.2; R1 and R2 are each hydrogen or a substituted or unsubstituted alkyl group; and is a single bond or a double bond, and a method for manufacturing a water-treatment membrane and a water-treatment membrane using the same.

Provided is a composition for interfacial polymerizing polyamide including an amine compound; and one or more types of compounds selected from among a purine-based compound and a pyrimidine-based compound of Chemical Formula 1: ##STR00001## wherein, in Chemical Formula 1: X is N or NH; Y is O or OH; Z is O, OH or NH.sub.2; R1 and R2 are each hydrogen or a substituted or unsubstituted alkyl group; and is a single bond or a double bond, and a method for manufacturing a water-treatment membrane and a water-treatment membrane using the same.

Films including solvent barriers and primer layers are described. In particular, films including a substrate, the substrate including polylactic acid, a primer layer disposed on the substrate, a barrier layer disposed on the surface of the primer layer opposite the substrate, and an adhesive layer disposed on a surface of the barrier layer opposite the primer layer. The barrier layer includes an amorphous aliphatic polyamide with a glass transition temperature of at least 40 #C. Such films can provide acceptable adhesion and barrier performance to polylactic acid based graphics film systems.

Films including solvent barriers and primer layers are described. In particular, films including a substrate, the substrate including polylactic acid, a primer layer disposed on the substrate, a barrier layer disposed on the surface of the primer layer opposite the substrate, and an adhesive layer disposed on a surface of the barrier layer opposite the primer layer. The barrier layer includes an amorphous aliphatic polyamide with a glass transition temperature of at least 40 #C. Such films can provide acceptable adhesion and barrier performance to polylactic acid based graphics film systems.

A separator and a lithium-ion battery. The separator includes a porous substrate, and a first coating layer arranged on at least one surface of the porous substrate, wherein the first coating layer includes an aromatic polyamide. An aramid coating layer is used; the aromatic polyamide in the aramid coating layer swells or plasticizes under the action of a solvent and a lithium salt in the electrolyte at high temperature or normal temperature, to increase the elongation of the separator, while improving the safety performance of the lithium-ion battery by interaction between the aramid coating layer and the electrode active material or the binder.