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US 4,988,364 AGranted
Coated cation exchange yarn and process
AssigneeE. I. Du Pont de Nemours and Company
InventorsStephen A. Perusich, James T. Keating
Life of this patent
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Abstract
A sheath/core yarn having as its core a fluorinated cation exchange resin, oriented at least 1x, in alkali metal salt form and as its sheath an unoriented or oriented melt-fabricable precursor or derivative of the same salt-form fluorinated cation exchange resin. The invention also includes various processes for making the sheath/core yarn.
Claims18
A cation exchange yarn comprising:
- (a) an inner core, said inner core comprising a fluorinated cation exchange copolymer having a mole ratio of non-functional to functional monomer of about 2.8-11.8:1, being first oriented and then hydrolyzed sufficiently to achieve a tenacity of at least 0.5 grams per denier and a tensile modulus of at least 2 grams per denier, and having a denier of between 50 and 400 after orientation and
- (b) an outer coating on the inner core, said outer coating comprising a melt-fabricable form of a fluorinated cation exchange copolymer having mole ratio of non-functional to functional monomer differing from that of the core by no more than 3 units.
Dependencies are inferred from the claim text.