The present invention relates to a foamable polyetherimide resin. These foamable polyetherimides have an effective amount of a chemical blowing agent which decomposes at a temperature equal to or greater than the glass transition temperature of the polyetherimide resin and does not have an adverse effect on the polyetherimide.
EXPANDED AND EXPANDABLE HIGH GLASS TRANSITION TEMPERATURE POLYMERS
申请人:General Electric Company
公开号:EP1963432A1
公开(公告)日:2008-09-03
Expanded and expandable high glass transition temperature polymers
申请人:Donovan Michael Stephen
公开号:US20070149629A1
公开(公告)日:2007-06-28
A expandable or expanded composition comprises either: a) an immiscible blend of polymers having more than one glass transition temperature and one of the polymers has a glass transition temperature greater than 180 degrees Celsius; b) a miscible blend of polymers having a single glass transition temperature greater than 217 degrees Celsius; or, c) a single virgin polymer having a glass transition temperature of greater than 247 degrees Celsius.