Softer blended nitrile elastomeric article

Patent metadata

Field	Value
Publication number	US-12240980-B2
Application number	US-202117511649-A
Country	US
Kind code	B2
Filing date	Oct 27, 2021
Priority date	Oct 29, 2020
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

An elastomeric article is formed from a blend of nitrile rubber and polychloroprene rubber. The elastomeric article can be a glove, such as a medical exam glove. The elastomeric article is softer than a conventional nitrile elastomeric article. The elastomeric article is formed from a blended rubber latex emulsion of nitrile and polychloroprene. The blended rubber latex emulsion may be free of sulfur and vulcanization accelerators.

First claim

What is claimed is:

1. An elastomeric article comprising: an article comprising a flexible layer of elastomeric material, wherein the elastomeric material is formed from a blended emulsion of nitrile rubber and chloroprene rubber, the article having a first surface and a second surface,
wherein the blended emulsion comprises a divalent metal oxide and a trivalent crosslinker, and
wherein the blended emulsion is free from sulfur and free from a dithiocarbamate accelerator, zincediethyldithiocarbamate (ZDEC), zinc mercaptobenzothiazole (ZMBT), diphenyl guanidine (DPG), or a combination thereof.

2. The elastomeric article of claim 1 , wherein the ratio of nitrile rubber to chloroprene rubber in the blended emulsion is in a range from about 50:50 to about 95:5.

3. The elastomeric article of claim 1 , wherein the blended emulsion includes a solids content of between about 15 percent and about 30 percent, by weight.

4. The elastomeric article of claim 1 , wherein coagulation of the blended emulsion to form the elastomeric article is accelerated by the crosslinker.

5. The elastomeric article of claim 1 , wherein the article is a glove.

6. The elastomeric article of claim 5 , wherein the first surface is a donning side of the glove and the second surface is a grip side of the glove.

7. The elastomeric article of claim 1 , wherein coagulation of the blended emulsion to form the elastomeric article is accelerated by a metallic salt, wherein the metallic salt includes nitrate, sulfate, or chloride salts of calcium, aluminum, or zinc, or a combination thereof.

8. The elastomeric article of claim 7 , wherein coagulation of the blended emulsion to form the elastomeric article is further accelerated by the trivalent crosslinker.

9. The elastomeric article of claim 8 , wherein the metallic salt is a divalent compound.

10. The elastomeric article of claim 8 , wherein the metallic salt is calcium nitrate.

11. The elastomeric article of claim 8 , wherein the trivalent crosslinker is a metallic oxide that forms bonds with carboxyl groups of the nitrile rubber.

Assignees

• O & M Halyard Inc

Inventors

• Modha Shantilal H
• Issara Sopha
• Tan Siew Hoe

Classifications

• C08L2312/00

  Crosslinking · CPC title

• C08L2201/52

  Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C · CPC title

• C08J2411/02

  Latex · CPC title

• C08J2309/04

  Latex · CPC title

• C08J7/126

  Halogenation · CPC title