Abstract: A readily adhesive polyester film comprising a polyester film having provided on at least one surface thereof a readily adhesive thin layer (a primer layer) containing an aqueous phenoxy resin; anda process for preparation of a readily adhesive polyester film which comprises applying an aqueous coating containing an aqueous phenoxy resin on at least one surface of a polyester film before completion of crystalline orientation, and then subjecting the resulting film to drying, stretching and heating treatments to complete crystalline orientation of the film.

Abstract: A heat transfer recording sheet comprising(A) a substrate film, and(B) formed on at least one surface of the substrate film, a film of an acrylic resin having recurring units represented by the following formula (1) ##STR1## wherein R.sup.1 represents a hydrogen atom or a methyl group,R.sup.2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms,R.sup.3 and R.sup.4 are identical or different and each represents an alkyl or hydroxyalkyl group having 1 to 5 carbon atoms,X represents a halogen atom, andl is 2, 3 or 4.

Abstract: A polyester film having on at least one surface thereof a primer layer comprising a crosslinked product of a polyurethane having at least one functional group selected from a carboxyl group, a sulfo group, a hemisulfate group, and salts of these groups and a polyepoxy compound. The polyester film having a primer layer can be produced by coating an aqueous primer coating composition comprising a polyurethane having at least one of a carboxylic acid salt group, a sulfonic acid salt group and a hemisulfate salt group on at least one surface of a polyester film before its crystallization and orientation are completed, and thereafter completing the crystallization and orientation by subjecting the coated film to drying, stretching and heat-treatment, and is useful as a base film for magnetic recording media.

Abstract: A process for producing a slippery biaxially stretched polyester film, which comprises coating one or both surfaces, preferably one surface, of a running polyester film, before the completion of its crystalline orientation, with an aqueous solution or dispersion containing(A) a metal salt having the composition of the following formula ##STR1## wherein Me represents a metal ion having a valence of 2 to 6, R is H or CH.sub.3, X is one equivalent of an anion, y is 1-6, z is 0-2, w is 0-8, and p is a number equal to the quotient obtained by dividing the total of y+2z+w by the atomic valence of Me, provided that when y is 2 or more, two or more R groups may be identical or different, when w is 2 or more, two or more X ions may be identical or different, and the group ##STR2## in the case of R.dbd.CH.sub.

Abstract: A process for producing a slippery biaxially stretched polyester film, which comprises coating one or both surfaces, preferably one surface, of a running polyester film, before the completion of its crystalline orientation, with an aqueous solution or dispersion containing(A) a metal salt having the composition of the following formula ##STR1## wherein Me represents a metal ion having a valence of 2 to 6, R is H or CH.sub.3, X is one equivalent of an anion, y is 1-6, z is 0-2, w is 0-8, and p is a number equal to the quotient obtained by dividing the total of y+2z+w by the atomic valence of Me, provided that when y is 2 or more, two or more R groups may be identical or different, when w is 2 or more, two or more X ions may be identical or different, and the group ##STR2## in the case of R=CH.sub.

Abstract: A process for producing an easily adherable biaxially stretched polyester film, which comprises coating a primer composition consisting of (A) and aqueous dispersion of polyurethane and (B) a montan wax salt and optionally a nonionic or anionic surface-active agent on the surface of a polyester film which has not yet been stretched completely, drying the coating, completing the stretching of the coated film, and then heat-setting it thereby to form a primer coated layer on the film surface.

Abstract: A linear aromatic polyester comprising, in the polymer molecule, at least 50 mole % of a repeating unit being represented by the formula ##SPC1##In whichR.sub.1 and R.sub.2 are the same or different and represent an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2,With an intrinsic viscosity of 0.3 or more when measured at 35.degree.C. by use of orthochlorophenol as a solvent.