Stretchable coated fabric and process for producing same

Abstract

A stretchable coated fabric is treated for water repellency with a fluorinated water repellent that comprises a copolymer containing a perfluoroalkyl group with six or less carbon atoms (C6 fluorinated water repellent). The use of no C8 fluorinated water repellents that contain perfluorooctanoic acid, perfluorooctane sulfonate, and the like makes the fabric exerts no influence on the environment. And the fluorinated water repellent has a toluene repellency of 100 seconds or longer; a synthetic resin solution applied to at least one side of the stretchable fiber fabric has a thixotropic index at 23° C. in a range from 1.4 to 2.0; and the synthetic resin has a 100% modulus of 5 kgf/cm 2 or greater. This prevents the synthetic resin from leaking to the back side and allows formation of a resin coating film that has good film forming properties.

1 . A stretchable coated fabric produced by treating a stretchable fiber fabric for water repellency with a fluorinated water repellent that comprises a copolymer comprising a perfluoroalkyl group with six or less carbon atoms and applying a synthetic resin solution to at least one side of the stretchable fiber fabric to form a resin coating film that comprises a synthetic resin,
 wherein the stretchable fiber fabric treated for water repellency with the fluorinated water repellent has a toluene repellency of 100 seconds or longer, and the synthetic resin solution has a thixotropic index at 23° C. in a range from 1.4 to 2.0, and wherein the synthetic resin has a 100% modulus of 5 kgf/cm 2  or greater.   
     
     
         2 . The stretchable coated fabric according to  claim 1 , wherein the synthetic resin is at least one selected from acrylic resins, urethane resins, and silicone resins. 
     
     
         3 . The stretchable coated fabric according to  claim 1 , wherein the stretchable coated fabric has an initial water-repellency (JIS L1092) of a fourth grade or higher and a water repellency after 20 washings of a third grade or higher. 
     
     
         4 . The stretchable coated fabric according to  claim 3 , wherein the stretchable coated fabric has a hydraulic resistance (JIS L1092 A Method) in a range from 100 to 3000 mmH 2 O and a moisture permeability of 3000 g/m 2 /24 hr or greater (JIS L1092 A-1 Method). 
     
     
         5 . The stretchable coated fabric according to  claim 4 , wherein the stretchable coated fabric has an air permeability of 6 cc/cm 2 /sec or less (JIS L1018 Frazier Method). 
     
     
         6 . The stretchable coated fabric according to  claim 1 , wherein the stretchable fiber fabric is a fabric knitted by a fine gauge knitting machine with 28 gauge or higher. 
     
     
         7 . The stretchable coated fabric according to  claim 1 , wherein the stretchable fiber fabric is a fabric that primarily comprises polyamide fibers and/or polyester fibers having a total fineness of 84 dtex or less, and that has a basis weight of 200 g/m 2  or less, a warp elongation (JIS L1096 A Method) at a load of 0.5 kgf of 45% or less, and a warp elongation at a load of 2.0 kgf of 75% or less. 
     
     
         8 . A process for producing a stretchable coated fabric, the process comprising
 a step of preparing a stretchable fiber fabric treated for water repellency with a fluorinated water repellent that comprises a copolymer comprising a perfluoroalkyl group with six or less carbon atoms, and   a step of applying a solution of a synthetic resin in a solvent to at least one side of the stretchable fiber fabric,   wherein the fluorinated water repellent is used to impart a toluene repellency of 100 seconds or longer to the stretchable fabric, and the synthetic resin solution has a thixotropic index at 23° C. in a range from 1.4 to 2.0, and   wherein the synthetic resin has a 100% modulus of 5 kgf/cm 2  or greater.   
     
     
         9 . The process for producing a stretchable coated fabric according to  claim 8 , wherein the synthetic resin is at least one selected from acrylic resins, urethane resins, and silicone resins. 
     
     
         10 . The process for producing a stretchable coated fabric according to  claim 8 , wherein the stretchable fiber fabric is a fabric knitted by a fine gauge knitting machine with 28 gauge or higher. 
     
     
         11 . The process for producing a stretchable coated fabric according to  claim 8 , wherein the stretchable fiber fabric is a fabric that primarily comprises polyamide fibers and/or polyester fibers having a total fineness of 84 dtex or less and that has a basis weight of 200 g/m 2  or less, a warp elongation (JIS L1096 A Method) at a load of 0.5 kgf of 45% or less, and a warp elongation at a load of 2.0 kgf of 75% or less.