Coating processes – Coating remains adhesive or is intended to be made adhesive – Pressure sensitive adhesive
Patent
1997-11-07
1998-12-22
Pianalto, Bernard
Coating processes
Coating remains adhesive or is intended to be made adhesive
Pressure sensitive adhesive
4253812, 427294, 4274301, B05D 510
Patent
active
058515860
ABSTRACT:
The present invention relates to a process for producing a polymer film from an aqueous polymer composition wherein the process comprises the steps of: (A) introducing an aqueous composition comprising water and a polymer through at least one feed unit in one or more upstream sections of an extruder comprising a plurality of interconnecting sections wherein at least one downstream section comprises a homogenizer mixer; (B) conveying the composition through the extruder; (C) maintaining the composition at a temperature of from about 60.degree. C. to about 160.degree. C. as it is conveyed through the extruder; (D) reducing the pressure in at least one section of the extruder downstream of the feed units sufficiently to evaporate at least a portion of the water in the composition conveyed through that section; (E) removing the evaporated water from the extruder through at least one vent in a downstream section to form a water-reduced composition; and (F) extruding the water-reduced composition through a die thereby to produce a film.
In other embodiments, the invention relates to a process for producing sheets of a pressure-sensitive adhesive composition and to a process for coating a composition such as a pressure-sensitive adhesive composition onto a support web. In each of the embodiments of the invention, a film, sheet or coating composition is formed from an aqueous composition containing large amounts of water, and the product obtained is essentially water-free.
REFERENCES:
patent: 4065532 (1977-12-01), Wild et al.
patent: 4906421 (1990-03-01), Plamthottam et al.
patent: 5100728 (1992-03-01), Plamthottam et al.
patent: 5716669 (1998-02-01), LaRose et al.
LaRose Joseph Arthur
Overholt Eric Alan
Schnieders Lawrence Joseph
Avery Dennison Corporation
Pianalto Bernard
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