Heat treated multilayer knitted textile of liquid crystal polymer fibers and modified polyacrylonitrile fibers, and process for making same
AssigneeShadow Works, LLC
InventorJames Gigrich
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for manufacturing a multilayer knitted textile by heating a multi-layer knitted textile in the presence of one or more dye compounds, wherein the multilayer knitted textile comprises a fabric outer layer and a fabric inner layer, wherein the fabric outer layer is knit from a first yarn containing a combination of modacrylic fibers and cotton fibers, wherein the fabric inner layer is knit from a second yarn made from 50-90% HBA/HNA filaments, wherein the heating shrinks the outer layer from about 5 to 25% in length, width, or both.
Claims20
A process for manufacturing a multilayer knitted textile, comprising the step of (i) heating a multi-layer knitted textile in the presence of one or more dye compounds at a temperature from 140-350 degrees F., wherein the multilayer knitted textile comprises a fabric outer layer and a fabric inner layer, wherein the fabric outer layer is knit from a first yarn containing a combination of modacrylic fibers and cotton fibers, wherein the fabric inner layer is knit from a second yarn made from 50-90% 4-hydroxybenzoic acid (HBA) and 6-hydroxynaphthalene2-carboxylic acid (HNA) filaments, wherein the heating shrinks the outer layer from about 5 to 25% in length, width, or both.
A double heat-treated protective article, having a heat-treated multilayer knitted textile, the heat-treated multilayer knitted textile comprising a fabric outer layer and a fabric inner layer, wherein the fabric outer layer is knit from a first yarn containing a combination of modacrylic fibers and cotton fibers, wherein the fabric inner layer is knit from a second yarn made from 50-90% HBA/HNA filaments, wherein the liquid crystal polymer filaments comprise a denier selected from the group consisting of 200d, 400d, 750d, 1000d, 1420d, 1500d, and 2250d, wherein the liquid crystal polymer filaments are melt spun fibers of a polycondensate of 4-hydroxybenzoic acid (HBA) and 6-hydroxynaphthalene-2-carboxylic acid (HNA) monomers (HBA/HNA), wherein the knit of the fabric inner layer is oriented at an oblique angle to the knit of the fabric outer layer, wherein the fabric outer layer is attached to the fabric inner layer, wherein the heat-treated multilayer knitted textile is pre-shrunk about 10-15%, and wherein the protective article is secondarily heat-shrunk an additional 4%.
Dependencies are inferred from the claim text.