Product
AssigneeThe Standard Oil Company
InventorsEdward F. Steigelmann, Robert D. Hughes, Joseph Gabor
Life of this patent
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Abstract
Hollow membrane fibers are formed from a mixture of N-alkoxyalkyl polyamide, polyvinyl alcohol, di(lower alkyl) sulfoxide and water. The fibers are useful for separating chemicals, e.g., aliphatically-unsaturated hydrocarbons, from mixtures containing them.
Claims15
A composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of film-forming N-alkoxyalkyl nylon and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the nylon, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperatures suitable for extrusion of the composition.
An extrusible composition consisting essentially of polymer consisting essentially of about 30 to 85 weight % of N-alkoxyalkyl nylon and about 15 to 70 weight % of water-soluble polyvinyl alcohol based on their total, about 70 to 400 weight % of di(lower alkyl) sulfoxide based on the total weight of the nylon and polyvinyl alcohol, and about 1 to 30 weight % of water based on the total weight of the water and di(lower alkyl) sulfoxide.
A composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of film-forming N-alkoxyalkyl nylon having about 5 to 60% of the amide groups substituted with alkoxyalkyl groups and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the nylon, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperatures suitable for extrusion of the composition.
Dependencies are inferred from the claim text.