Drawing isocyanate-treated polyester filaments
AssigneeAmerican Cyanamid Company
InventorsRobert P. Kreahling, Donald J. Casey, David Z. Goldenberg
Life of this patent
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Abstract
Polyester filaments of improved drawability and improved adhesion to rubber are prepared by applying to polyester filaments coated with aromatic isocyanate containing at least two isocyanate groups per molecule 0.02 to 0.4% on weight of fiber of a hydroxy-containing finish less than 1 hour prior to drawing such filaments to 4 to 7 times their undrawn length.
Claims4
In the process of dry heat drawing filaments of synthetic linear condensation polyester coated with an aromatic isocyanate containing at least two isocyanate groups per molecule to stretch such filaments to 4 to 7 times their undrawn length, the improvement comprising applying to the isocyanate-coated polyester filaments 0.02 to 0.4% on weight of fiber of a hydroxy-containing finish less than one hour prior to dry heat drawing said filaments by heating the filaments in air in contact with a heated surface
Dependencies are inferred from the claim text.