Process for surface treating a polyester film

Details Process for surface treating a polyester film Process for surface treating a polyester film

1986-04-08

1988-07-05

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Coating or impregnating workpiece before molding or shaping...

2642106, 264235, 264236, 427172, 427173, 427386, B29C 5502, B32B 2708

Patent

active

047553375

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.

REFERENCES:
patent: 3627625 (1971-12-01), Jarrett
patent: 4093458 (1978-06-01), McGrail et al.
patent: 4132552 (1979-01-01), Poesschen et al.
patent: 4267288 (1981-05-01), Burkhart et al.
patent: 4364885 (1982-12-01), Kanai et al.

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