Title:
Method and apparatus for microcellular polymer extrusion
Document Type and Number:
WIPO Patent Application WO1998008667
Kind Code:
A3
Abstract:
The present invention relates to a method which comprises the steps of continuously extruding microcellular polymeric material having cells of essentially uniform size of less than about 50 microns average size from a single-phase solution of polymeric material and blowing agent contained in extrusion apparatus (30) including a nucleating pathway (66), the blowing agent present in the solution in an amount less than about 80 percent saturation concentration as determined at the lowest pressure in the system after the point of blowing agent injection (54) prior to the nucleating pathway (66).
Inventors:
BURNHAM THEODORE A (US)
CHA SUNG W (US)
WALAT ROBERT H (US)
KIM ROLAND Y (US)
ANDERSON JERE R (US)
STEVENSON JAMES F (US)
SUH NAM P (US)
PALLAVER MATTEW (US)
CHA SUNG W (US)
WALAT ROBERT H (US)
KIM ROLAND Y (US)
ANDERSON JERE R (US)
STEVENSON JAMES F (US)
SUH NAM P (US)
PALLAVER MATTEW (US)
Application Number:
PCT/US1997/015088
Publication Date:
May 14, 1998
Filing Date:
August 26, 1997
Export Citation:
Assignee:
TREXEL INC (US)
BURNHAM THEODORE A (US)
CHA SUNG W (US)
WALAT ROBERT H (US)
KIM ROLAND Y (US)
ANDERSON JERE R (US)
STEVENSON JAMES F (US)
SUH NAM P (US)
PALLAVER MATTHEW (US)
BURNHAM THEODORE A (US)
CHA SUNG W (US)
WALAT ROBERT H (US)
KIM ROLAND Y (US)
ANDERSON JERE R (US)
STEVENSON JAMES F (US)
SUH NAM P (US)
PALLAVER MATTHEW (US)
International Classes:
B29C44/32; B29C44/34; B29C44/46; B29C48/06; B29C48/29; B29C48/30; B29C48/74; C08J9/00; B29C48/07; B29K105/04; (IPC1-7): B29C44/46; B29C44/34; B29C44/32; B29C47/10
Domestic Patent References:
| WO1996016782A1 | 1996-06-06 | |||
| WO1996000644A1 | 1996-01-11 |
Foreign References:
| DE4425319A1 | 1996-01-25 | |||
| DE9411804U1 | 1994-09-15 | |||
| EP0453687A1 | 1991-10-30 | |||
| US5334356A | 1994-08-02 | |||
| EP0722975A1 | 1996-07-24 | |||
| US5098267A | 1992-03-24 | |||
| US4344710A | 1982-08-17 | |||
| US4350663A | 1982-09-21 | |||
| EP0441762A2 | 1991-08-14 | |||
| EP0039041A2 | 1981-11-04 | |||
| US5227103A | 1993-07-13 | |||
| US4260351A | 1981-04-07 | |||
| US5110998A | 1992-05-05 | |||
| US3988404A | 1976-10-26 | |||
| US4344907A | 1982-08-17 | |||
| US5124096A | 1992-06-23 | |||
| US3343214A | 1967-09-26 |
Other References:
BALDWIN D F ET AL: "AN EXTRUSION SYSTEM FOR THE PROCESSING OF MICROCELLULAR POLYMER SHEETS: SHAPING AND CELL GROWTH CONTROL", CABIOS COMPUTER APPLICATIONS IN THE BIOSCIENCES, vol. 36, no. 10, May 1996 (1996-05-01), pages 1425 - 1435, XP000637008
PARK C B ET AL: "FILAMENTARY EXTRUSION OF MICROCELLULAR POLYMERS USING A RAPID DECOMPRESSIVE ELEMENT", POLYMER ENGINEERING & SCIENCE, vol. 36, no. 1, 15 January 1996 (1996-01-15), pages 34 - 48, XP000583331
PARK C B ET AL: "FILAMENTARY EXTRUSION OF MICROCELLULAR POLYMERS USING A RAPID DECOMPRESSIVE ELEMENT", POLYMER ENGINEERING & SCIENCE, vol. 36, no. 1, 15 January 1996 (1996-01-15), pages 34 - 48, XP000583331
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