Full-grained milled napa leather and process for the production thereof
US6953621B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Nov 21, 2002 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Apr 18, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31558
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A full-grained milled napa leather is provided on its grain side with a dressing formed from a solidified plastics dispersion. Required leather properties are still ensured and the production process is substantially simplified and more economical. First, the leather, such as cowhide, is subjected on a mechanically untreated grain side to a milling process for at least two hours. This results in a typical napa structure with a natural pebbled grain. Then, a polyurethane dispersion is applied to the grain side containing pigment particles and optionally further additives. Then the hide is allowed to dry. The solidified dispersion forming the dressing has a thickness of, preferably, from 0.05 mm to 0.07 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.