Patent ID: 9212403
Filing Date: 2015-12-15
Classification: C08G,C09D,C14B,C14C,D06P

Abstract:
1. A coated natural leather that is produced by obtaining a natural leather through a leather tanning step involving a tanning agent containing chromium or glutaraldehyde as well as steps for re-tanning using a re-tanning agent comprising synthetic tannin and a first resin, where the synthetic tannin comprises (A) a condensation product of an aromatic sulfonic acid and formaldehyde, or an aromatic sulfonic acid and a condensation product of an aromatic sulfonic acid and formaldehyde, (B) a methylene cyclocondensation product of an aromatic sulfonic acid and a hydroxyl aromatic compound, or an aromatic sulfonic acid and a methylene cyclocondensation product of an aromatic sulfonic acid and a hydroxy aromatic compound, and (C) glyoxal, while the resin comprises (A) an acrylic acid, methacrylic acid, acrylic acid ester, a methacrylic acid polymer ester or a mixture thereof, and (B) a polycondensation product of melamine and formaldehyde, where the leather is re-tanned using the re-tanning agent, dyeing using a dying agent comprising an acid water-based dye, and greasing using a greasing agent constituted by (A) synthetic oil and a natural oil, or (B) a mixed oil comprising synthetic oil and a natural component, and then forming on the surface of the natural leather, in this order, a pre coat that comprises a second resin, a pigment, an auxiliary and water, a base coat that comprises a third resin, a pigment an auxiliary, a touch agent, a leveling agent and water, a color coat layer comprising a mixture of (1) 48 to 90 percent by weight of a hard component of a resin containing at least two-component polyurethane resin with (2) 52 to 10 percent by weight of a soft component of a resin containing at least two-component polyurethane resin, the hard component of a resin having a 10% modulus that is over 2.3 but not more than 3.0, and the soft component of a resin having a 10% modulus that is over 0.0 but not more than 1.0, and a top coat layer comprising a mixture of (1) 15 to 35 percent by weight of a medium component of a resin containing at least two-component polyurethane resin with (2) 65 to 85 percent of a soft component of a resin containing at least two-component polyurethane resin, the medium component of a resin having a 10% modulus that is over 1.0 but not more than 2.3, and the soft component of a resin having a 10% modulus that is over 0.0 but not more than 1.0, wherein when the surface of the coated natural leather is measured using a KES-SE-SR-U roughness friction tester, the smoothness (SMD) is 2.5 μm or less, slickness (MIU/MMD) is 25 or more, and wear resistance test result using a Gakushin friction fastness tester is 4,000 times or more.