C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
18/32
C08L 83/04 (2006.01) B01D 67/00 (2006.01) B01D 71/70 (2006.01) D01F 1/10 (2006.01)
Patent
CA 1046216
ABSTRACT OF THE DISCLOSURE The gas permeability of a polymeric material is altered by irreversibly mechanically stressing in at least one direction a polymeric material which is a mixture of two phases where one phase is evenly distributed throughout a second phase and one phase is present in an amount of at least 10 weight percent. The stressing is carried out at a temperature such this the material is flowable and the temperature is reduced to retain the molecular orientation. The phases are polymeric materials which each have an elastic shear modulus of less than 109 dynes per square centimeter at processing temperature, are chemically dissimilar materials and have oxygen gas permeabilities which differ by a factor of at least 10. At least one phase is a thermoplastic which is solid at ambient temperature and the mixture retains its physical state on standing at ambient temperature over extended periods of time. An example would be cold rolling a sheet of a polyblend of polyethylene and polydimethylisiloxane. Mechanically stressing film in at least one direction by cold rolling. drawing or blowing polymeric materials as defined above lters the gas permeability from unstressed film. An extruded tube of polymeric meterial mechanically stressed in at least one direction has altered gas permeability compared to an unstressed tube.
201953
Falender James R.
Kendrick Thomas C.
Lindsey Sarah E.
Ward Andrew H.
Dow Corning Corporation
Na
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