Composition and process for making porous articles from ultra hi

Details Composition and process for making porous articles from ultra hi Composition and process for making porous articles from ultra hi

1988-03-28

1989-11-14

Ivy, C. Warren

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521143, 521919, 524487, 524489, 524585, 264126, C08K 501, C08L 2306

Patent

active

048808431

ABSTRACT:
Porous shaped articles made from a molded composite of ultra high molecular weight polyethylene and polyethylene wax are disclosed. These articles are produced by free-sintering a non intensively mixed blend of UHMW-PE particles and particles of a polyethylene wax. The process involves mixing the UHMW-PE and wax both in powdered form until a heterogeneous mixture is formed, but under conditions which do not lead to any substantial fracturing of the UHMW-PE particles or melting of either component. The heterogeneous mix is then transferred to a press mold to form a shape and pressure is applied sufficient only to maintain the enclosed volume of the shape. The mold is heated to a temperature above the melting point of the UHMW-PE for a period of time to allow the particles to soften, expand, and contact one another at their surfaces. The mixture is then quickly cooled.
Porous articles so produced may exhibit stiffness values in excess of about 2000 psi while at the same time showing excellent porosity values of less than about 25 inches water pressure drop.

REFERENCES:
patent: 3944536 (1976-03-01), Lupton et al.
patent: 3954927 (1976-05-01), Duling et al.
patent: 4237037 (1980-12-01), Takahashi
patent: 4487875 (1984-12-01), Nakajima
patent: 4588633 (1986-05-01), Kono

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