Process for the production of expanded particles of a...

Details Process for the production of expanded particles of a... Process for the production of expanded particles of a...

C - Chemistry, Metallurgy

08

K

403/78, 403/80

C08K 3/00 (2006.01) C08J 9/00 (2006.01) C08J 9/22 (2006.01) C08J 9/228 (2006.01) C08L 23/02 (2006.01)

Patent

CA 1244199

ABSTRACT A process for the production of expanded particles, which comprises providing an aqueous dispersion containing expandable particles which are formed of a polypropylene resin and which contain a blowing agent and an expansion aid and maintained at a temperature higher than the softening point of the resin and under a pressurized condition, and subjecting the dispersion to a lower pressure so that the expandable particles are expanded. The expansion aid is organic or inorganic solids having a particle size of 0.1 to 150 µm and a melting point higher than the temperature at which the expansion of the expandable particles is performed and serves to improve the expansion ratio.

483929

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