发明名称 |
Process for producing polymer films from aqueous polymer compositions |
摘要 |
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 DEG C. to about 160 DEG 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.
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申请公布号 |
US5851586(A) |
申请公布日期 |
1998.12.22 |
申请号 |
US19970966255 |
申请日期 |
1997.11.07 |
申请人 |
AVERY DENNISON CORPORATION |
发明人 |
LAROSE, JOSEPH ARTHUR;OVERHOLT, ERIC ALAN;SCHNIEDERS, LAWRENCE JOSEPH |
分类号 |
B29C47/40;B29C47/76;(IPC1-7):B05D5/10 |
主分类号 |
B29C47/40 |
代理机构 |
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