Coating for cutting implements

Patent metadata

Field	Value
Publication number	US-9719173-B2
Application number	US-56253809-A
Country	US
Kind code	B2
Filing date	Sep 18, 2009
Priority date	Sep 19, 2008
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

Coated cutting implements having increased longevity, corrosion and stain resistance, a smooth and uniform appearance and color, and/or reduced friction between cutting blades are provided. The coatings on the cutting implements have at least two layers. The first layer is a metal-based layer that imparts hardness or wear-resistance to the cutting implement. The second layer is comprised of an organic polymer.

First claim

What is claimed is:

1. A coated cutting implement comprising:
a cutting implement having a cutting edge; and
a coating disposed on the cutting edge, the coating comprising:
a first layer in contact with the cutting edge, the first layer comprising metal carbides, the metal carbides containing titanium and chromium in a weight ratio in the range of 30:70 to 72:28 Ti:Cr; and
a non-stick layer in contact with and formed over the first layer, the non-stick layer including an organic polymer comprising a polysiloxane and being free of fluoride.

2. The implement of claim 1 , wherein the first layer comprises titanium carbide and chromium carbide in a weight ratio in the range of 40:60 to 50:50 Ti:Cr.

3. The implement of claim 1 , wherein the first layer comprises about 40 to 50 weight percent titanium carbide and about 50 to 60 weight percent chromium carbide, based on the total weight of the first layer.

4. The implement of claim 1 , wherein the first layer forms a metallurgical bond with the cutting edge.

5. The implement of claim 1 , wherein the cutting implement is scissors.

6. The implement of claim 1 , wherein the cutting implement comprises stainless steel.

7. The implement of claim 1 , wherein the first layer has a nanoindentation hardness of at least 10 GPa, as measured on a polished silicon wafer.

8. The implement of claim 1 , wherein the first layer has a nanoindentation hardness of at least 25 GPa, as measured on a polished silicon wafer.

9. The implement of claim 1 , wherein the first layer is silver, grey or charcoal in appearance.

10. The implement of claim 1 , wherein the implement is selected from the group consisting of knives, rotary style paper trimmers, and guillotine style paper trimmers.

11. The implement of claim 1 , wherein the first layer is a PVD coating.

12. The implement of claim 6 , wherein the cutting implement comprises stainless steel.

13. The implement of claim 1 , wherein the non-stick layer has a thickness between 5 and 50 microns.

14. The implement of claim 1 , wherein the first layer has a wear resistance of no greater than 70 micron 3 /minute as measured according to ASTM G99-95a.

15. The implement of claim 1 , wherein the first layer has a wear resistance of no greater than 30 micron 3 /minute as measured according to ASTM G99-95a.

16. The implement of claim 1 , wherein the non-stick layer has a tangential scratch adhesion stress in accordance with ASTM D7027-05 and ASTM C1624 in the range of 0.74-1.03 MPa.

Assignees

• Peterson Michael E
• Buchtmann Larry
• Acme United Corp

Inventors

• Peterson Michael E
• Buchtmann Larry

Classifications

• C23C28/00 Primary

  Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D · CPC title

• C23C14/0641

  Nitrides (C23C14/0617 takes precedence) · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• C23C14/0664

  Carbonitrides · CPC title

• Y10T428/31663

  As siloxane, silicone or silane · CPC title