Rhone-Poulenc Films

Rhone-Poulenc Chimie

Philippe Corsi

Jean-Pierre Assante

Marcel Eyraud

Didier Veyrat

Etienne Fleury

Joel Richard

Louis Vovelle

Michel Prissette

Nicole Pecate

Abel Buisine

Transparent receptor substrates, well suited for electrostatic reprography, e.g., for the production of overhead transparencies, exhibit excellent transparency, good slip, good adhesion of toner thereto and good electrical conductivity, comprise (i) a transparent composite polyester base(s) having (ii) a toner-receptive primer coating (P) on at least one of the face surfaces thereof, such composite polyester base comprising (a) a thick layer (A) of semicrystalline polyester and (b) a thin layer (B) of an identical or different polyester adhered to at least one of the face surfaces of said thick layer (A), and the at least one primer coating (P) comprising an acrylic polymer having a glass transition temperature ranging from 10.degree. C. to 50.degree. C., a free --COOH carboxylic functional group content less than 50 millimoles per 100 grams of said acrylic polymer and a thickness no greater than 0.3 .mu.m.

Transparencies for electrostatic reprography

Composite polyester films and their use as protective layers for

Polyester films, their use for obtaining composite films and resultant

Composite polyester films with improved adhesion and process for

Biaxially drawn, advantageously filled multilayer polyester film substrates, well adapted for the manufacture of magnetic recording tapes, are comprised of a composite of at least two adjacent layers of biaxially stretched thermoplastic polyester film, at least one of the face surfaces thereof having a roughness defined by a plurality of dome and peak protuberances extending therefrom, said domes being present in a concentration of at least 5 per mm.sup.2 and having heights of at least 9/100 of one micron, the ratio of the height of such dome protuberances to the diameter of the base thereof being less than 1/100, and the ratio of the height of such peak protuberances to the diameter of the base thereof being at least 1/100.

Biaxially drawn, composite polyester film substrates

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Lyons, France

Philippe Corsi