Abstract: A silver halide photographic material comprising a polyester support having formed thereon at least one light-sensitive silver halide emulsion layer is disclosed, said polyester support having a glass transition temperature of from 90.degree. to 200.degree. C. and having had at least one side thereof subjected to ultraviolet-light irradiation. The photographic material exhibits improved anticurl properties and high adhesion between the emulsion layer and the support.

Abstract: A silver halide photographic material comprises a support and at least one silver halide emulsion layer provided thereon. The support is essentially composed of poly(ethylene-2,6-naphthalate) and has Young's modulus of 550 to 650 kg/mm.sup.2 in both lengthwise direction and widthwise direction and breaking elongation of not less than 70%.

Abstract: A cationic high-molecular weight compound is represented by formula (I): ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each represents a hydrogen atom or C.sub.1-6 lower alkyl group; L.sup.1 represents --COO-- or --CONH-- and L.sup.2 represents a divalent group; J represents a C.sub.1-20 alkylene group or C.sub.7-20 aralkylene group; R.sup.3, R.sup.4 and R.sup.5 may be the same or different and each represents a C.sub.1-20 alkyl group or C.sub.7-20 aralkyl group; X.sup.

Abstract: There is disclosed a method for producing a polyethylene naphthalate from a naphthalenedicarboxylic acid represented by the following formula (I) and a glycol, in the presence of one or more compounds of glycol-soluble magnesium compounds, glycol-soluble manganese compounds, and glycol-soluble zinc compounds; a nitrogen-containing basic compound; and a phosphorous compound; which method comprises adding a glycol-soluble germanium compound of a limited amount, as a polymerization catalyst, at a limited relationship between amounts of said metal compound, the said nitrogen-containing basic compound, and the said phosphorous compound.

Abstract: A photographic polyester support is disclosed which hardly curls when heat-treated at a temperature of from 50.degree. C. to the glass transition temperature thereof in the form of a bulk roll, its thickness pattern satisfying the conditions of (1) Max-Min in the whole widthwise direction (TD R value): 8 .mu.m or less, (2) Max-Min of 5 m length in the lengthwise direction (MD R value): 10 .mu.m or less, (3) the difference in thickness between the adjacent hill and hollow (MD fluctuation): 8 .mu.m or less, and (4) the maximum value of hills above a base line of the average thickness of both ends (TD base line value): 5 .mu.m or less. The surface flatness of the heat-treated support is good. When the support is coated with photographic emulsions, the surface of the coated photographic material is even.