Process for producing a low density foamed polyethylene

Details Process for producing a low density foamed polyethylene Process for producing a low density foamed polyethylene

1987-10-08

1988-08-02

Foelak, Morton

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

264 53, 264 54, 264DIG5, 264DIG13, 428219, 428255, 4283144, 521 79, 521143, 521 81, B32B 700

Patent

active

047613289

ABSTRACT:
A foamed and expanded low density polyethylene sheet or tube possesses both superior buoyancy and thermal resistance characteristics. The sheet or tube is made by a process comprising mixing a low density polyethylene with a blowing agent, surface activation agent and, preferably, a separation agent, heating the mixture at different temperatures to first melt the mixture and then gasify the blowing agent to expand the polyethylene cells, cooling the melted mass to partially harden and shrink the expanded cells, further expanding the cells by introducing a second gaseous blowing agent, cutting, extruding and cooling the expanded mass, forming a sheet or tube from the cooling mass, and finally cooling the sheet or tube for at least 24 hours. A buoyant, thermal resistant, water-repellent and moisture resistant sheet or tube results, which can be used, for example, as a liner for garments, including sports, business and military garments and other related equipment.

REFERENCES:
patent: 4345041 (1982-08-01), Hoki et al.
patent: 4359539 (1982-11-01), Hoki et al.
patent: 4360556 (1982-11-01), Heider
patent: 4368276 (1983-01-01), Park
patent: 4370378 (1983-01-01), Zabrocki et al.
patent: 4387169 (1983-06-01), Zabrocki et al.
patent: 4395510 (1983-07-01), Park
patent: 4569950 (1986-02-01), Hoshi et al.

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