Imbibition process
AssigneeE. I. Du Pont de Nemours and Company
InventorsNikolai P. Bakeev, Gennadii M. Lukovkin, Ilan Marcus, Anatolii E. Mikushev, Nikolai A. Shitov, Bernhard E. Vanissum, Alexandr L. Volynskii
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Abstract
A process of imbibition drawing is improved by a pretreatment that preferably involves straining an undrawn filament bundle, or other elongated shaped undrawn or partially drawn synthetic polymeric article, while wetted with a cracking agent, before incorporating a desired additive by imbibition drawing, thereby increasing the imbibition capacity of the article, and improved articles incorporating such additives. Alternatively or in addition the pretreatment involves polarizing irradiation, before imbibition drawing.
Claims21
An improved process involving imbibition drawing of an undrawn or partially drawn elongated shaped article (hereinafter "said feed article") of synthetic organic polymer, whereby finely divided amounts of additive are imbibed into the shaped article as it is drawn in the presence of a fluid and of the additive, wherein said feed article is pretreated, before performing the imbibition drawing, to improve the quality of crazing in the resulting article by being so pretreated.
Dependencies are inferred from the claim text.