Title:
EXTRUDED FOAM PRODUCT WITH REDUCED SURFACE DEFECTS
Document Type and Number:
WIPO Patent Application WO2001064777
Kind Code:
A3
Abstract:
The present invention generally relates to processes for preparing extruded foam products and more particularly to a process for producing such products wherein surface defects are minimized. There has been a movement to replace conventional halo-carbon blowing agents in favor of purportedly more environmentally safe halo-carbon free blowing agents such as carbon dioxide, nitrogen, argon, water, air, nitrogen, and helium. However, these halo-carbon free blowing agents, in particular carbon dioxide, have higher foaming rates and higher volatility leading to greater surface defects in the extruded foam. The present invention employs polyethylene wax to reduce or eliminate the occurrence of surface defects where halo-carbon free blowing agents are employed in an extruded foam manufacture process. The polyethylene wax containing extruded foam products of this invention are characterized by a generally smooth substantially defect free surface and contain a majority of closed cells which are free of any trapped halo-carbon blowing agents.
Inventors:
MILLER LARRY M (US)
BREINDEL RAYMOND M (US)
WEEKLEY MITCHELL Z (US)
CISAR THOMAS E (US)
BREINDEL RAYMOND M (US)
WEEKLEY MITCHELL Z (US)
CISAR THOMAS E (US)
Application Number:
PCT/US2001/006142
Publication Date:
March 14, 2002
Filing Date:
February 27, 2001
Export Citation:
Assignee:
OWENS CORNING FIBERGLASS CORP (US)
MILLER LARRY M (US)
BREINDEL RAYMOND M (US)
WEEKLEY MITCHELL Z (US)
CISAR THOMAS E (US)
MILLER LARRY M (US)
BREINDEL RAYMOND M (US)
WEEKLEY MITCHELL Z (US)
CISAR THOMAS E (US)
International Classes:
C08J9/12; C08J9/00; C08L23/06; C08L101/00; (IPC1-7): C08J9/00
Foreign References:
| AT328746B | 1976-04-12 | |||
| EP0969037A1 | 2000-01-05 |
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