Title:
IMPROVED MELT EXTRUSION PROCESSES AND FILMS PRODUCED THEREBY
Document Type and Number:
WIPO Patent Application WO1997045244
Kind Code:
A3
Abstract:
The invention relates to a process for melt extruding a film layer of a thermoplastic olefin which comprises extruding the film having physical characteristics under process conditions selected by reference to the Draw ratio Dr and the Aspect ratio A such that draw resonance is avoided in which in addition the process conditions are defined by reference to the Deborah number such that the molten polymer is extruded at a Draw ratio of at least 30 in a high elasticity region at a DOLLAR (g)lc value of characteristic time as defined herein of from 0.001 to 0.6 s, a Deborah number as defined herein in excess of 0.005 and an A value as defined herein lower than 0.8. Narrower ranges of these parameters may be defined for application of the invention to different polymer types. 00000
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Inventors:
CHAMBON FRANCOIS H
OHLSSON STEFAN B
DEMAY YVES
SILAGY DAVID
AGASSANT JEAN-FRANCOIS
OHLSSON STEFAN B
DEMAY YVES
SILAGY DAVID
AGASSANT JEAN-FRANCOIS
Application Number:
PCT/US1997/009129
Publication Date:
February 12, 1998
Filing Date:
May 28, 1997
Export Citation:
Assignee:
EXXON CHEMICAL PATENTS INC (US)
International Classes:
B29C48/00; B29C48/08; B29C55/00; B29C55/02; (IPC1-7): B29C47/00; B29C55/00
Domestic Patent References:
| WO1996031348A1 | 1996-10-10 | |||
| WO1995001250A1 | 1995-01-12 |
Foreign References:
| US4859379A | 1989-08-22 | |||
| EP0292336A1 | 1988-11-23 | |||
| EP0634443A2 | 1995-01-18 | |||
| US5272016A | 1993-12-21 | |||
| EP0351744A2 | 1990-01-24 |
Other References:
SILAGY D. ET AL: "Study of the stability of the film casting process", POLYMER ENGINEERING AND SCIENCE, vol. 36, no. 21, November 1996 (1996-11-01), pages 2614 - 2625, XP000689602
"ADVANTAGES OF METALLOCENE ETHYLENE POLYMER RESIN BLENDS IN BLOWN AND CAST FILMS", RESEARCH DISCLOSURE, no. 376, 1 August 1995 (1995-08-01), pages 565 - 573, XP000527846
"ADVANTAGES OF METALLOCENE ETHYLENE POLYMER RESIN BLENDS IN BLOWN AND CAST FILMS", RESEARCH DISCLOSURE, no. 376, 1 August 1995 (1995-08-01), pages 565 - 573, XP000527846
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