Title of Invention	"AN ELASTOMERIC COMPOSITION"
Abstract	An elastomeric composition comprising: (a) from 50 to 95 parts by weight per 100 parts of rubber of an hydrogenated nitrile-butadiene rubber (HNBR) modified with either zinc methacrylate or a combination of zinc oxide and methacrylic acid; (b) form 5 to 50 parts by weight per 100 parts of rubber of an unmodified HNBR; (c) from 0.5 to 10 parts by weight per 100 parts of rubber of a peroxide cure co-agent of the kind such as described herein; (d) from 0.25 to 20 parts by weight per 100 parts of rubber of an organic peroxide of the kind such as described herein; and (e) from 5 to 50 parts by weight per 100 parts of rubber of carbon black, (f) from 1 to 20 parts by weight per 100 parts of rubber of a phenolic resin.

Title of Invention

"AN ELASTOMERIC COMPOSITION"

Abstract

An elastomeric composition comprising: (a) from 50 to 95 parts by weight per 100 parts of rubber of an hydrogenated nitrile-butadiene rubber (HNBR) modified with either zinc methacrylate or a combination of zinc oxide and methacrylic acid; (b) form 5 to 50 parts by weight per 100 parts of rubber of an unmodified HNBR; (c) from 0.5 to 10 parts by weight per 100 parts of rubber of a peroxide cure co-agent of the kind such as described herein; (d) from 0.25 to 20 parts by weight per 100 parts of rubber of an organic peroxide of the kind such as described herein; and (e) from 5 to 50 parts by weight per 100 parts of rubber of carbon black, (f) from 1 to 20 parts by weight per 100 parts of rubber of a phenolic resin.

Full Text	Field of the Invention This invention relates to a high modulus elastomeric composition particularly suited for use in high load-bearing synchronous drive belts. Background The use of hydrogenated acrylonitrile-butadiene (HNBR) rubber in belts, particularly for automotive use, has been suggested in the past. See e.g. articles by Trevor A. Brown: "Compounding for Maximum Heat Resistance and Load Bearing Capacity in HNBR Belts", Rubber World magazine, October 1993, page 53, and "Using HNBR to Improve Belt Compounds", Rubber & Plastics News. June 7, 1993, page 45. See also U.S. Patent No. 5,405,690. There are, however, no suggestions on what the composition should be. Accordingly the present invention relates an elastomeric composition comprising: (a) from 50 to 95 parts by weight per 100 parts of rubber of an hydrogenated nitrile-butadiene rubber (HNBR) modified with either zinc methacrylate or a combination of zinc oxide and methacrylic acid; (b) form 5 to 50 parts by weight per 100 parts of rubber of an unmodified HNBR; (c) from 0.5 to 10 parts by weight per 100 parts of rubber of a peroxide cure co-agent of the kind such as described herein; (d) from 0.25 to 20 parts by weight per 100 parts of rubber of an organic peroxide of the kind such as described herein; and (e) from 5 to 50 parts by weight per 100 parts of rubber of carbon black, wherein the composition is characterized by the addition of from 1 to 20 parts by weight per 100 parts of rubber of a phenolic resin. Summary of the Invention: In accordance with the practice of the present invention, there is provided an elastomeric composition comprising: (a) from 50 to 95 parts by weight per 100 parts of rubber (phr) of an HNBR modified with either zinc methacrylate or a combination of zinc oxide and meth acry lic acid; (b) form 5 to 50 phr of an unmodified HNBR; (c) from 0.5 to 10 phr of a peroxide cure co-agent; (d) from 0.25 to 20 phr of an organic peroxide; and e) from 1 to 20 phr of a phenolic resin. A typical example of an HNBR modified with zinc oxide and methacrylic acid is commercially available as Zetpol ZSC2295 from Nippon Zeon Co. An unmodified HNBR is available as Zetpol 2020, also from Nippon Zeon Co. Typical of the peroxide cure co-agents are trimethylolpropane trimethacrylate, trifunctional organosiloxanes, triallyl cyanurate and triallyl isocyanurate. While from 0.5 to 10 phr of the co-agent can be used, 3 to 6 phr are preferred. Typical of the organic peroxides which can be used with the invention are 1,3-bis(t-butylperoxy-1-propyl) benzene, dicumyl peroxide and α,α-bis(t-butylperoxy) valerate. While 0.25 to 20 phr of the peroxide can be used, 1.5 to 4.5 phr are preferred. Typical of the phenolic resins which can be used are phenol formaldehyde resins. Preferred is an oil-modified thermosetting phenol formaldehyde resin. While from 1 to 20 phr of the phenolic resin can be used, from 6 to 12 phr are preferred. It is believed that the phenolic resin provides a high level of adhesion to the reinforcement in the cured belts as well as allows the belts to be built on conventional elastomer processing equipment without the use of solvents. In addition to those ingredients listed above, the composition can contain other materials customarily used in rubber compounding such as fillers, antioxidants, antiozonants, processing aids, etc. Particularly preferred is from 5 to 50 phr of a N330 carbon black. The composition of the invention has been found to provide synchronous drive belts with teeth having sufficient rigidity without the use of fiber reinforcement. As a measure of this property, it is preferred that the modulus at 10% elongation be from 5.2 to 7.25 MPa. While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention. WE CLAIM: 1. An elastomeric composition comprising: (a) from 50 to 95 parts by weight per 100 parts of rubber of an hydrogenated nitrile-butadiene rubber (HNBR) modified with either zinc methacrylate or a combination of zinc oxide and methacrylic acid; (b) form 5 to 50 parts by weight per 100 parts of rubber of an unmodified HNBR; (c) from 0.5 to 10 parts by weight per 100 parts of rubber of a peroxide cure co-agent of the kind such as described herein; (d) from 0.25 to 20 parts by weight per 100 parts of rubber of an organic peroxide of the kind such as described herein; and (e) from 5 to 50 parts by weight per 100 parts of rubber of carbon black, (f) from 1 to 20 parts by weight per 100 parts of rubber of a phenolic resin. 2. The composition as claimed in claims 1 wherein the peroxide cure co-agent is trimethylolpropane trimethacrylate. 3. The composition as claimed in claim 1 wherein the peroxide is bis (t-butylperoxy) valerate. 4. A power transmission belt produced from an elastomeric composition as claimed in claim 1. 5. An elastomeric composition substantially as hereinbefore described with reference to the foregoing examples.

Full Text

Field of the Invention
This invention relates to a high modulus elastomeric composition particularly suited for use in high load-bearing synchronous drive belts.
Background
The use of hydrogenated acrylonitrile-butadiene (HNBR) rubber in belts, particularly for automotive use, has been suggested in the past. See e.g. articles by Trevor A. Brown: "Compounding for Maximum Heat Resistance and Load Bearing Capacity in HNBR Belts", Rubber World magazine, October 1993, page 53, and "Using HNBR to Improve Belt Compounds", Rubber & Plastics News. June 7, 1993, page 45. See also U.S. Patent No. 5,405,690. There are, however, no suggestions on what the composition should be.

Accordingly the present invention relates an elastomeric composition comprising:
(a) from 50 to 95 parts by weight per 100 parts of rubber of an
hydrogenated nitrile-butadiene rubber (HNBR) modified with
either zinc methacrylate or a combination of zinc oxide and
methacrylic acid;
(b) form 5 to 50 parts by weight per 100 parts of rubber of an
unmodified HNBR;
(c) from 0.5 to 10 parts by weight per 100 parts of rubber of a
peroxide cure co-agent of the kind such as described herein;
(d) from 0.25 to 20 parts by weight per 100 parts of rubber of an
organic peroxide of the kind such as described herein; and
(e) from 5 to 50 parts by weight per 100 parts of rubber of
carbon black,
wherein the composition is characterized by the addition of from 1 to 20 parts by weight per 100 parts of rubber of a phenolic resin.

Summary of the Invention:
In accordance with the practice of the present invention, there is provided an elastomeric composition comprising:
(a) from 50 to 95 parts by weight per 100 parts of rubber (phr)
of an HNBR modified with either zinc methacrylate or a
combination of zinc oxide and meth acry lic acid;
(b) form 5 to 50 phr of an unmodified HNBR;
(c) from 0.5 to 10 phr of a peroxide cure co-agent;
(d) from 0.25 to 20 phr of an organic peroxide; and

e) from 1 to 20 phr of a phenolic resin.
A typical example of an HNBR modified with zinc oxide and methacrylic acid is commercially available as Zetpol ZSC2295 from Nippon Zeon Co. An unmodified HNBR is available as Zetpol 2020, also from Nippon Zeon Co.
Typical of the peroxide cure co-agents are trimethylolpropane trimethacrylate, trifunctional organosiloxanes, triallyl cyanurate and triallyl isocyanurate. While from 0.5 to 10 phr of the co-agent can be used, 3 to 6 phr are preferred.
Typical of the organic peroxides which can be used with the invention are 1,3-bis(t-butylperoxy-1-propyl) benzene, dicumyl peroxide and α,α-bis(t-butylperoxy) valerate. While 0.25 to 20 phr of the peroxide can be used, 1.5 to 4.5 phr are preferred.
Typical of the phenolic resins which can be used are phenol formaldehyde resins. Preferred is an oil-modified thermosetting phenol formaldehyde resin. While from 1 to 20 phr of the phenolic resin can be used, from 6 to 12 phr are preferred. It is believed that the phenolic resin provides a high level of adhesion to the reinforcement in the cured belts as well as allows the belts to be built on conventional elastomer processing equipment without the use of solvents.
In addition to those ingredients listed above, the composition can contain other materials customarily used in rubber compounding such as fillers, antioxidants, antiozonants, processing aids, etc. Particularly preferred is from 5 to 50 phr of a N330 carbon black.
The composition of the invention has been found to provide synchronous drive belts with teeth having sufficient rigidity without the use of fiber

reinforcement. As a measure of this property, it is preferred that the modulus at 10% elongation be from 5.2 to 7.25 MPa.
While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.

WE CLAIM:
1. An elastomeric composition comprising:
(a) from 50 to 95 parts by weight per 100 parts of rubber of an
hydrogenated nitrile-butadiene rubber (HNBR) modified with
either zinc methacrylate or a combination of zinc oxide and
methacrylic acid;
(b) form 5 to 50 parts by weight per 100 parts of rubber of an
unmodified HNBR;
(c) from 0.5 to 10 parts by weight per 100 parts of rubber of a
peroxide cure co-agent of the kind such as described herein;
(d) from 0.25 to 20 parts by weight per 100 parts of rubber of an
organic peroxide of the kind such as described herein; and
(e) from 5 to 50 parts by weight per 100 parts of rubber of
carbon black,
(f) from 1 to 20 parts by weight per 100 parts of rubber of a
phenolic resin.
2. The composition as claimed in claims 1 wherein the peroxide
cure co-agent is trimethylolpropane trimethacrylate.
3. The composition as claimed in claim 1 wherein the peroxide is
bis (t-butylperoxy) valerate.
4. A power transmission belt produced from an elastomeric composition as claimed in claim 1.

5. An elastomeric composition substantially as hereinbefore described with reference to the foregoing examples.

Documents:

530-del-1998-abstract.pdf

530-del-1998-claims.pdf

530-del-1998-correspondence-others.pdf

530-del-1998-correspondence-po.pdf

530-del-1998-description (complete).pdf

530-del-1998-form-1.pdf

530-del-1998-form-13.pdf

530-del-1998-form-19.pdf

530-del-1998-form-2.pdf

530-del-1998-form-3.pdf

530-del-1998-form-4.pdf

530-del-1998-form-6.pdf

530-del-1998-gpa.pdf

530-del-1998-petition-137.pdf

530-del-1998-petition-138.pdf

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Patent Number

215469

Indian Patent Application Number

530/DEL/1998

PG Journal Number

11/2008

Publication Date

14-Mar-2008

Grant Date

27-Feb-2008

Date of Filing

27-Feb-1998

Name of Patentee

THE GOODYEAR TIRE AND RUBBER COMPANY

Applicant Address

1144 EAST MARKET STREET, AKRON, OHIO 44316-0001, U.S.A.

Inventors:

#	Inventor's Name	Inventor's Address
1	DANIEL STANLEY GRANATOWICZ	2711 CORONADO DRIVE, LINCOLN, NEBRASKA 68516 U.S.A.
2	MATHEW THOMAS MORRIS	400 WEST DILIN, LINCOLN, NEBRASKA 68521 U.S.A.
3	MERVIN VICTOR PILKINGTON	585 NORTHWOOD DRIVE, AKRON, OHIO 44313 U.S.A.
4	GARY RICHARD TOMPKIN	4780 MEDINA ROAD, COPLEY, OHIO 44321 U.S.A.

PCT International Classification Number

C08L 15/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	08/816,973	1997-03-13	U.S.A.