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US4525517A
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Vulcanizable polymer compositions with improved scorch
Assignee: Polysar Ltd
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Filing: 1984-02-13
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Granted: 1985-06-25
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Expires: 2004-02-13
Abstract
Abstract Vulcanizable polymer compositions with improved scorch are provided comprising a carboxylated nitrile rubber, one or more polyvalent metal oxides and one or more alkali metal salts selected from the lithium, sodium and potassium salts of C12-18-alkanoic acids.
Inventors
- 👤 Kyosaku Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:42
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A vulcanizable polymer composition with improved scorch comprising (1) a carboxylated nitrile rubber, said rubber being a copolymer of butadiene, acrylonitrile and one or more, α,β-unsaturated carboxylic acids selected from acrylic, methacrylic, fumaric, maleic and itaconic acids, (2) one or more polyvalent metal oxides, and (3) one or more alkali metal salts selected from the lithium, sodium and potassium salts of C 12-18 -alkanoic acids.
Claim 2
Dependent Claim
65 words
A vulcanizable polymer composition with improved scorch comprising (1) a carboxylated nitrile rubber, said rubber being a copolymer of butadiene, acrylonitrile and one or more, α,β-unsaturated carboxylic acids selected from acrylic, methacrylic, fumaric, maleic and itaconic acids, (2) one or more polyvalent metal oxides, and (3) one or more alkali metal salts selected from the lithium, sodium and potassium salts of C 12-18 -alkanoic acids.
Claim 3
Dependent Claim
28 words
The composition according to claim 1 wherein said polyvalent metal oxide is selected from zinc, magnesium, calcium, cadmium, barium, lead, cobalt, tin and strontium oxides, and mixtures thereof.
Claim 4
Dependent Claim
37 words
The composition according to claim 1 wherein said polyvalent metal oxide is selected from zinc, magnesium, calcium and barium oxides, and mixtures thereof, and wherein said composition further comprises elemental sulfur and one or more sulfur accelerators.
Claim 5
Dependent Claim
35 words
The composition according to claim 1 wherein the amount of said alkali metal salt in said composition is from about 0.5 to about 25 parts by weight per 100 parts by weight of said rubber.
Claim 6
Dependent Claim
46 words
The composition according to claim 2 wherein said alkali metal salt is selected from sodium and potassium stearate and wherein the amount of said salt in said composition is from about 0.5 to about 10 parts by weight per 100 parts by weight of said rubber.
Claim 7
Dependent Claim
42 words
The composition according to claim 5 wherein the polyvalent metal oxide is zinc oxide and wherein the amount of said salt in said composition is from about 2 to about 5 parts by weight per 100 parts by weight of said rubber.
Claim 8
Dependent Claim
46 words
The composition according to claim 3 wherein said alkali metal salt is selected from sodium and potassium stearate and wherein the amount of said salt in said composition is from about 0.5 to about 10 parts by weight per 100 parts by weight of said rubber.
Claim 9
Dependent Claim
42 words
The composition according to claim 7 wherein the polyvalent metal oxide is zinc oxide and wherein the amount of said salt in said composition is from about 2 to about 5 parts by weight per 100 parts by weight of said rubber.
Claim 10
Independent Claim
72 words
A method for preparing a vulcanizable polymer composition with improved scorch comprising mixing (1) a carboxylated nitrile rubber, said rubber being a copolymer of butadiene, acrylonitrile and one or more α,β-unsaturated carboxylic acids selected from acrylic, methacrylic, fumaric, maleic and itaconic acids, with (2) one or more alkali metal salts selected from the lithium, sodium and potassium salts of C 12-18 -alkanoic acids and with (3) one or more polyvalent metal oxides.
Claim 11
Independent Claim
72 words
A method for preparing a vulcanizable polymer composition with improved scorch comprising mixing (1) a carboxylated nitrile rubber, said rubber being a copolymer of butadiene, acrylonitrile and one or more α,β-unsaturated carboxylic acids selected from acrylic, methacrylic, fumaric, maleic and itaconic acids, with (2) one or more alkali metal salts selected from the lithium, sodium and potassium salts of C 12-18 -alkanoic acids and with (3) one or more polyvalent metal oxides.
Claim 12
Dependent Claim
38 words
The method according to claim 9 wherein said polyvalent metal oxide is selected from zinc, magnesium, calcium and barium oxides and mixtures thereof and wherein said method further comprises mixing elemental sulfur and one or more sulfur accelerators.
Claim 13
Dependent Claim
32 words
The method according to claim 9 wherein the amount of said alkali metal salt is from about 0.5 to about 25 parts by weight per 100 parts by weight of said rubber.
Claim 14
Dependent Claim
37 words
Tne method according to claim 9 wherein said carboxylated nitrile rubber and said alkali metal salt are mixed in a first step and the mixture resulting therefrom is mixed with said metal oxide in a second step.
Claim 15
Dependent Claim
46 words
The method according to claim 12 wherein the mixture resulting from said first step is heat treated at a temperature of from about 85° to about 175° C. while being mixed and the mixture resulting from the heat treatment is then mixed with said metal oxide.
Claim 16
Dependent Claim
61 words
The method according to claim 13 wherein the polyvalent metal oxide is zinc oxide, said alkali metal salt is selected from sodium and potassium stearate and the amount of said salt is from about 2 to about 5 parts by weight per 100 parts by weight of said rubber, and wherein said temperature is from about 100° to about 160° C.
Claim 17
Dependent Claim
80 words
The method according to claim 10 wherein said carboxylated nitrile rubber and said alkali metal salt are mixed in a first step, the mixture resulting therefrom is heat treated at a temperature of from about 85° to about 175° C. while being mixed, the mixture resulting from the heat treatment is mixed with said metal oxide in a second step, and said sulfur and said sulfur accelerator are mixed in one of said second step or a subsequent third step.
Claim 18
Dependent Claim
10 words
The vulcanizate formed by heating the compositions of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |