Process for making electrically conductive textile filaments
First Claim
1. In a process of preparing an electrically conductive textile fiber from a moving non-conductive, filamentary polymer substrate in which a dispersion of finely-divided electrically-conductive particles is applied to the filamentary substrate in an amount sufficient to render the electrical resistance of the textile not more than about 109 ohms/cm. in a liquid which is a solvent for the substrate but does not react with the electrically conductive particles, and the solvent is removed from the substrate after a desired degree of penetration has taken place in the annular region located at the periphery of the filament and before the structural integrity of the substrate has been destroyed, the improvement which comprises:
- applying a mix to the nonconductive filamentary substrate with a grooved, roll-type mix applicator, the mix being comprised of a dispersion of electrically conductive particles in a liquid solvent wherein the liquid solvent will dissolve the substrate and will flash evaporate at 150°
C., and wherein the solvent is a mixture of formic acid and a member selected from the group consisting of;
(a) an amide;
(b) a carboxylic acid other than formic acid;
(c) an alcohol;
(d) an ester;
(e) a ketone;
(f) an ether; and
(g) a hydrocarbon.
3 Assignments
0 Petitions
Accused Products
Abstract
This process for making antistatic filaments utilizes a specific mixture of compounds in order to suffuse electrically conductive particles into a filamentary polymeric substrate by forwarding the substrate through a grooved roll-type mix applicator. The mixture comprises a dispersion of the electrically conductive particles in liquid solvent which is a mixture of formic acid and a member selected from the group consisting of an amide, a carboxylic acid other than formic acid, an alcohol, an ester, a ketone, an ether, and a hydrocarbon. The process provides advantages over the prior art in permitting the use of high processing speeds, enabling easy stringup, and allowing the use of knotty and/or slubby filamentary substrates.
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Citations
18 Claims
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1. In a process of preparing an electrically conductive textile fiber from a moving non-conductive, filamentary polymer substrate in which a dispersion of finely-divided electrically-conductive particles is applied to the filamentary substrate in an amount sufficient to render the electrical resistance of the textile not more than about 109 ohms/cm. in a liquid which is a solvent for the substrate but does not react with the electrically conductive particles, and the solvent is removed from the substrate after a desired degree of penetration has taken place in the annular region located at the periphery of the filament and before the structural integrity of the substrate has been destroyed, the improvement which comprises:
applying a mix to the nonconductive filamentary substrate with a grooved, roll-type mix applicator, the mix being comprised of a dispersion of electrically conductive particles in a liquid solvent wherein the liquid solvent will dissolve the substrate and will flash evaporate at 150°
C., and wherein the solvent is a mixture of formic acid and a member selected from the group consisting of;(a) an amide; (b) a carboxylic acid other than formic acid; (c) an alcohol; (d) an ester; (e) a ketone; (f) an ether; and (g) a hydrocarbon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification