Rotational molding of chemically cross-linked polyethylene foam

Details Rotational molding of chemically cross-linked polyethylene foam Rotational molding of chemically cross-linked polyethylene foam

B - Operations, Transporting

29

D

18/667

B29D 27/00 (1980.01)

Patent

CA 1038577

ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the manufacture of foamed, crosslinked polyethylene products by rotational molding. The process comprises the blending of polyethylene with a blowing agent in a non-acidic medium and heating at a temperature between 190°C and 300°C, the feature of the invention being a simultaneous blowing and crosslinking of polyethylene. The character- istic feature of the invention is the use of an organic peroxide as crosslinking agent having a half life-time in the range of 3 to 25 minutes, measured at 160° in benzene, and a vapor pressure not higher than 5mm Hg at 20°C. The preferred crosslinking agents are 2,5-dimethyl-2,5-di(tert-butyl-peroxy) hexyne-3 and 2,5- dimethyl-2,5-di(tert-butyl-peroxy) hexane in their liquid state.

194580

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