Natural grain leather
AssigneeSeton Company
InventorHermann Winkler
Life of this patent
Estimating the term…
Abstract
A leather finishing process in which, in pertinent part, a warm water milling step is added after the base coat is applied to “crust” leather and cured. The warm water contains at least one dye fixation agent including but not limited to about 0.1-2.0% by weight of formic acid. Moreover, the base coat itself is an aqueous base coat containing at least two polymers such as an acrylic salt or a polyurethane salt. Between the polymeric constituents of the base coat, the acid fixation agent, and the use of the warm water milling step after the base coat has been applied and dried, a surprisingly natural feel to the leather is attained without loss of excellent adhesion, wear-resistance and other properties when the leather is completely finished.
Claims34
A leather finishing method, comprising:
- applying to tanned hides a base coat containing at least two polymers in an aqueous composition;
- drying the base-coated tanned hides;
- top-coating the base-coated tanned hides;
- drying the top-coated and base-coated tanned hides;
- loading the dried, base-coated and top-coated tanned hides into drums that contain water, said water containing an acid fixation agent;
- immersing the dried, base-coated and top-coated tanned hides in the water;
- and
- tumbling the dried, base-coated and top-coated tanned hides in the water,
- wherein the base is fixed with the acid fixation agent.
A leather finishing method, comprising:
- applying to tanned hides a base coat containing at least a polyurethane salt and an acrylic salt in an aqueous composition;
- loading the tanned bides into drums containing water, wherein said water is between 150 to 300% water by weight, said water between 30 to 55 degrees C.;
- adding at least one acid fixation agent to the warm water, said acid fixation agent including but not limited to about 0.1 to 2.0% by weight of an acid;
- immersing the tanned hides into the water;
- tumbling the tanned hides in the water for about one hour;
- gently squeeze-drying the tanned hides;
- toggling the tanned hides;
- milling the tanned hides for about 8 hours;
- staking the tanned hides;
- spraying the tanned hides with at least one top coat;
- remilling the tanned hides;
- and
- softening the tanned hides.
A leather finishing method, comprising:
- applying to tanned hides a base coat containing at least a polyurethane salt and an acrylic salt in an aqueous composition, wherein about 60% of the aqueous composition by weight is comprised of about 20% acrylic by weight and about 2% polyurethane by weight, about 0.4% isopropanol by weight, about 10% silica duller by weight, about 22% silica drier by weight, and between 2 to 3% pigment by weight;
- loading the tanned hides into drums containing warm water, wherein said warm water is between 150 to 300% by weight 45 degrees C.;
- adding at least 0.1 to 2% of an acid fixation agent to the warm water, said acid fixation agent selected from the group consisting of formic acid, acetic acid, propionic acid and hydrochloric acid;
- immersing the tanned hides into the warm water;
- tumbling the tanned hides in the warm water for about one hour;
- gently squeeze-drying the tanned hides;
- toggling the tanned hides;
- milling the tanned hides for about 8 hours;
- staking the tanned hides using a specialized machine in which plates are equipped with a plurality of engaging protrusions which push and pull at the tanned hide surface whereby the tanned hide surface is stretched without being perforated;
- spraying the tanned hides with at least one top coat;
- remilling the tanned hides;
- and
- softening the tanned hides.
Dependencies are inferred from the claim text.