Low friction plastic track and extrusion process
First Claim
1. A process for making an elongated plastic track for use in a gravity feed display device, said track having a low coefficient of friction on at least one of its surfaces, comprising the steps of(a) mixing from 95.0 to 99.5 percent by weight of high impact polystyrene with 0.5 to 5.0 percent by weight of dimethylpolysiloxane fluid having a viscosity of between 20,000 and 40,000 centistokes so that the dimethylpolysiloxane is well dispersed in said high impact polystyrene,(b) extruding the mixture formed in (a) so as to form a track of the desired shape, and(c) thereafter burnishing said one surface of said track to decrease the coefficient of friction on said one surface.
3 Assignments
0 Petitions
Accused Products
Abstract
An elongated plastic track for use in a gravity feed display is extruded from a mixture of high impact polystyrene and dimethylpolysiloxane.
114 Citations
2 Claims
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1. A process for making an elongated plastic track for use in a gravity feed display device, said track having a low coefficient of friction on at least one of its surfaces, comprising the steps of
(a) mixing from 95.0 to 99.5 percent by weight of high impact polystyrene with 0.5 to 5.0 percent by weight of dimethylpolysiloxane fluid having a viscosity of between 20,000 and 40,000 centistokes so that the dimethylpolysiloxane is well dispersed in said high impact polystyrene, (b) extruding the mixture formed in (a) so as to form a track of the desired shape, and (c) thereafter burnishing said one surface of said track to decrease the coefficient of friction on said one surface.
Specification
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- Resources
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Current AssigneeMEAD Corporation (Meadwestvaco Corporation)
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Original AssigneeMEAD Corporation (Meadwestvaco Corporation)
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InventorsPreis, Allen D.
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Primary Examiner(s)Schofer, Joseph L.
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Assistant Examiner(s)Lipman, Bernard
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Application NumberUS06/510,495Time in Patent Office434 DaysField of Search264/177 R, 264/162, 264/171, 524/269US Class Current264/162CPC Class CodesC08L 2666/14 Macromolecular compounds ac...C08L 51/04 grafted on to rubbers
