Document Type and Number:
Japanese Patent JPS5021576
Kind Code:
B1
Abstract:
Strips or rods of foamed stereo-specific polyolefins are compressed to a thickness of at most half the original thickness and then stretched. The foamed polyolefin, e.g. polypropylene, has a density below 300 gms./litre, and may be prepared by passing a mixture of polymer and azodicarbonamide through an extruder and mixing with n-pentane before finally passing out of the extruder.
Application Number:
JP5702866A
Publication Date:
July 24, 1975
Filing Date:
August 31, 1966
Export Citation:
International Classes:
B29C55/00; B29C59/00; B29C67/20; C08J9/224; C08J9/38; D01D5/247; D01D5/42; (IPC1-7): B29D27/00
Domestic Patent References:
| JP40001817A | ||||
| JP36013116A |