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hydrogenated nitrile rubber

 

Perfluoroelastomers and hydrogenated nitrile rubber

Dia•Com's International Corporate Headquarters was specifically designed and constructed for state-of-the-art molded elastomeric diaphragm design and manufacturing. The 30,000 square foot facility, completed during the spring of 1994, had detailed planning and consideration given to material flow, HVAC and electrical systems as well as future expansion.

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Microprocessor-Controlled Production Presses were designed specifically for the production of fabric-reinforced and homogeneous elastomeric diaphragms. Our new production presses are built with high strength components. The microprocessors closely control the vulcanization process, thus assuring precise, repeatable control of the molding process. The result is high quality, low cost diaphragm production. Dia•Com utilizes unique compression and transfer molding processes to maximize efficiencies and insure the dimensional integrity of each part.

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History

Dia•Com is a leading international provider of innovative, cost-effective molded diaphragm solutions critical to the operation of essential systems and equipment in industrial, automotive, aerospace, medical instrumentation, and food and water processing applications. The company's reputation for excellence is based on superior quality in the design, manufacture and application of its high-performance, state-of-the-art, fabric-reinforced and homogeneous elastomeric diaphragm seals.

The company was founded in 1983 as a supplier of custom and standard diaphragm seals known for reliability and dependability. Today, Dia•Com, with worldwide corporate headquarters in Amherst, New Hampshire, focuses on forming strategic customer partnerships critical to the development of unique, technologically superior design solutions linked to its customers' success. As an extension of its customers’ design teams, Dia•Com offers a broad range of custom diaphragm solutions that are “designed for manufacturing,” and as a result, are more comprehensive, robust and cost-effective than competitive products.

Process for preventing gel formation in lattices of hydrogenated, low molecular weight, functionalized elastomers

Abstract

The present invention discloses a process for hydrogenating a latex of a low molecular weight functionalized, unsaturated elastomer to produce a latex of a hydrogenated, low molecular weight, low gel, functionalized elastomer, said process comprising hydrogenating the low molecular weight, functionalized, unsaturated elastomer in the presence of (1) an oxidant selected from the group consisting of oxygen and hydroperoxides, (2) a reducing agent selected from the group consisting of hydrazine and hydrazine hydrates, and (3) a metal ion activator, wherein a hydroxylamine is added to the latex of the low molecular weight, functionalized, unsaturated elastomer or to the latex of the hydrogenated, low molecular weight, functionalized elastomer prior, during, or subsequent to the hydrogenation to produce the latex of the hydrogenated low molecular weight, low gel, functionalized elastomer. This process can be used to make low molecular weight, hydrogenated, nitrile rubber latex which is comprised of water, an emulsifier, and the low molecular weight, hydrogenated, nitrile rubber, wherein the low molecular weight, hydrogenated, nitrile rubber has a molecular weight which is within the range of 500 to 20,000, wherein the low molecular weight, hydrogenated, nitrile rubber has a gel content of less than 10%, and wherein the low molecular weight, hydrogenated, nitrile rubber has a saturation level of at least about 80%.

Inventors: Tao; David D. H. (Louisville, KY), Gozdiff; Michael (North Canton, OH), Files; Edmee (Floyds Knobs, IN)
Assignee: Zeon Chemicals, L.P. (Louisville, KY)
Appl. No.: 12/176,885
Filed: July 21, 2008
Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
11177759 Jul., 2005 7411015

Current U.S. Class: 524/556 ; 524/565
Current International Class: C08L 31/00 (20060101)
Field of Search: 524/556,565

References Cited [Referenced By]
U.S. Patent Documents
4452950 June 1984 Wideman
5039737 August 1991 Parker et al.
5424356 June 1995 Parker et al.
5442007 August 1995 Parker et al.
5442009 August 1995 Parker et al.
6521694 February 2003 Belt et al.
6552132 April 2003 Belt et al.
Primary Examiner: Mulcahy; Peter D
Attorney, Agent or Firm: Rockhill; Alvin T.
Parent Case Text


This is a divisional of U.S. patent application Ser. No. 11/177,759, filed on Jul. 8, 2005 (now pending).
Claims


What is claimed is:

1. A latex of a low molecular weight, hydrogenated, nitrile rubber said latex being comprised of water, an emulsifier, and the low molecular weight, hydrogenated, nitrile rubber, wherein the low molecular weight, hydrogenated, nitrile rubber has a molecular weight which is within the range of 3,000 to 8,000, wherein the low molecular weight, hydrogenated, nitrile rubber has a gel content of 0%, and wherein the low molecular weight, hydrogenated, nitrile rubber has a saturation level which is within the range of about 90% to 99%.

2. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 1 wherein the low molecular weight, hydrogenated, nitrile rubber is a low molecular weight, hydrogenated, carboxylated nitrile rubber, wherein the low molecular weight, hydrogenated, carboxylated nitrile rubber is comprised of repeat units that are derived from 1,3-butadiene, acrylonitrile, and a carboxyl group containing monomer.

3. A latex of a low molecular weight, hydrogenated, nitrite rubber as specified in claim 2 wherein the carboxyl group containing monomer is methacrylic acid.

4. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 2 wherein the carboxyl group containing monomer is acrylic acid.

5. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 2 wherein the carboxyl group containing monomer is itaconic acid.

6. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 2 wherein the carboxyl group containing monomer is fumaric acid.

7. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 2 wherein the carboxyl group containing monomer is maleic acid.

8. A latex of a low molecular weight, hydrogenated, nitrile rubber said latex being comprised of water, an emulsifier, and the low molecular weight, hydrogenated, nitrile rubber, wherein the low molecular weight, hydrogenated, nitrile rubber has a molecular weight which is within the range of 500 to 8,000, wherein the low molecular weight, hydrogenated, nitrile rubber is essentially gel free, and wherein the low molecular weight, hydrogenated, nitrile rubber has a saturation level of at least about 90%.

9. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 8 wherein the low molecular weight, hydrogenated, nitrile rubber is a low molecular weight, hydrogenated, carboxylated nitrile rubber, wherein the low molecular weight, hydrogenated, carboxylated nitrile rubber is comprised of repeat units that are derived from 1,3-butadiene, acrylonitrile, and a carboxyl group containing monomer.

10. A latex of a low molecular weight, hydrogenated, nitrile rubber as specified in claim 9 wherein the carboxyl group containing monomer is methacrylic acid.

11. A latex as specified in claim 8 wherein the hydrogenated, low molecular weight, nitrile rubber has a number average molecular weight which is within the range of 1000 to 8,000.

12. A latex as specified in claim 8 wherein the low molecular weight, hydrogenated, nitrite rubber has a saturation level which is within the range of 90% to 99%.

13. A latex as specified in claim 9 wherein the hydrogenated, low molecular weight, nitrite rubber has a number average molecular weight which is within the range of 1000 to 8,000, and wherein the low molecular weight, hydrogenated, nitrite rubber has a saturation level which is within the range of 90% to 99%.

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