Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Coating or impregnating workpiece before molding or shaping...
Patent
1979-01-31
1980-10-28
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Coating or impregnating workpiece before molding or shaping...
264129, 264209, 2642103, 264216, 2642358, B29C 1702, B29D 702
Patent
active
042306540
ABSTRACT:
A concurrent-biaxially drawn polyvinyl alcohol film is prepared by fabricating a molten hydrate polyvinyl alcohol into a film; drying it under preventing an orientation thereof to form a substantially non-orientated substrate film having a water content of 3 to 20 wt. %; coating an aqueous dispersion of a macromolecular compound on at least one surface of the substrate film to form a coated film having an average water content of 5 to 30 wt. % with an increased water content of 2 to 10 wt. %; concurrent-biaxially drawing the coated film at an area elongation percent of 600 to 1300% to form a drawn film; drying the drawn film under releasing stress at a water content of less than 3 wt. % to form a dried film; and heat-treating continuously the dried film at higher than 160.degree. C. and lower than a decomposition temperature for a short time.
REFERENCES:
patent: 3136657 (1964-06-01), Dixler
patent: 3214291 (1965-10-01), Dixler
patent: 3440316 (1969-04-01), Miyake et al.
patent: 3985849 (1976-10-01), Notomi et al.
patent: 4124677 (1978-11-01), Saijo et al.
Kawasaki Motoo
Kitagawa Kiyoshi
Kuga Mutsuo
Watanabe Junkichi
Lowe James B.
Unitika Limited
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