Soft nitrile rubber formulation
AssigneeNorth Safety Products, Inc.
InventorTimothy M. Lipinski
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Abstract
Nitrile rubber compositions, articles of manufacture made therefrom, and methods of making them, are disclosed. The nitrile rubber compositions of the invention are substantially free of zinc oxide, and have good strength and chemical resistance while being softer than many conventional nitrile rubbers. The invention provides articles of manufacture, including gloves, which are soft, yet strong, and can be economically manufactured.
Claims10
A method of making a nitrile rubber composition, comprising the steps of
- combining a nitrile latex with a stabilizing agent,
- adjusting the pH of the nitrile latex to about 8.5-10.0 to yield a basic nitrile latex, and
- contacting the basic nitrile latex with a crosslinking agent and with at least one accelerator, and selecting said crosslinking agent to be substantially free of metallic oxide that ionically crosslinks carboxylic acid moieties of the latex to form a nitrile rubber composition.
A method of making a sulfur-cured nitrile rubber, comprising the steps of
- combining a carboxylated nitrile latex with a stabilizing agent,
- adjusting the pH of the nitrile latex to about 8.5-10.0 to yield a basic nitrile latex, and
- contacting the basic nitrile latex with a crosslinking agent selected from the group consisting of sulfur and sulfur donors, and with an accelerator, to form a nitrile rubber,
- wherein the resultant sulfur-cured nitrile rubber is substantially free of metallic oxide that ionically crosslinks carboxylic acid moieties of the latex.
A method of making a nitrile rubber composition, comprising the steps of
- combining a nitrile latex with a stabilizing agent,
- adjusting the pH of the nitrile latex to about 8.5-10.0 to yield a basic nitrile latex, and
- contacting the basic nitrile latex with a sulfur crosslinking agent and with at least one accelerator, and selecting the sulfur crosslinking agent to be free of a metallic oxide crosslinking agent, thereby forming a nitrile rubber composition,
- wherein the nitrile rubber composition contains no metallic oxide crosslinking agent.
A method of making a sulfur-cured nitrile rubber, comprising the steps of
- combining a carboxylated nitrile latex with a stabilizing agent,
- adjusting the pH of the nitrile latex to about 8.5-10.0 to yield a basic nitrile latex, and
- contacting the basic nitrile latex with a sulfur crosslinking agent selected from the group consisting of sulfur and sulfur donors and with an accelerator, to form a nitrile rubber,
- wherein the sulfur-cured nitrile rubber is substantially free of a metallic oxide as a crosslinking agent.
Dependencies are inferred from the claim text.