Expanded particles of polyolefin resin and process for...

Details Expanded particles of polyolefin resin and process for... Expanded particles of polyolefin resin and process for...

B - Operations, Transporting

29

C

18/639

B29C 44/34 (2006.01) C08J 9/18 (2006.01)

Patent

CA 1213112

ABSTRACT The mixture of water and the polyolefin resin particles impregnated with a volatile blowing agent are released from the interior of the pressure-resistant container under a constant temperature and constant pressure preferably keeping the partial pressure of the blowing agent constant, through at least one orifice having an area of 0.07 to 300 mm2, into a low-pressure zone. This invention gives various advantages when applied to the practical process resulting in expanded particles with superior properties which are free of blocking and remarkably uniform in the degree of expansion , and are useful for molding.

428024

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