US5501880A
Expired / Lapsed
US
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Process to produce reinforced tire cords with plasma treated fibers incorporated into a rubber/blocked isocyanate composition
Assignee: Goodyear Tire and Rubber Co
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Filing: 1994-10-21
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Granted: 1996-03-26
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Expires: 2014-10-21
Abstract
Abstract By utilizing the process of this invention, the adhesion between polymeric reinforcements and rubber compositions can be greatly improved. This invention more specifically discloses a process for preparing a rubber article containing a polymeric reinforcement which comprises: (1) plasma treating the polymeric reinforcement in a manner whereby reactive groups containing Zerewitinoff active hydrogen atoms are bonded to the surface thereof; (2) incorporating the polymeric reinforcement having Zerewitinoff active hydrogen atoms bonded to the surface thereof into an uncured rubber composition, wherein said rubber composition has pendant blocked isocyanate groups bound thereto; and (3) curing the uncured rubber into the desired shape for the rubber article at an elevated temperature sufficient to deblock the isocyanate groups bonded to the uncured rubber allowing for the isocyanate groups to react with the Zerewitinoff active hydrogen atoms bonded to the surface of the polymeric reinforcement.
Inventors
- 👤 Dane K. Parker
- 👤 Derek Shuttleworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:27
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; B; B60; B60C; B60C1/00; B60C9/00; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/728; C08G18/80; C08G18/8061; C08G18/807; D; D06; D06M; D06M10/00; D06M10/02; D06M10/025; C08G2380/00; C08J2321/00; D06M2200/00; D06M2200/50; Y; Y10; Y10S; Y10S156/00; Y10S156/91
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
144 words
A process for preparing a rubber article containing a polymeric reinforcement which consists essentially of the steps of: (1) plasma treating the polymeric reinforcement in a manner whereby reactive groups containing Zerewitinoff active hydrogen atoms are bonded to the surface thereof; (2) incorporating the polymeric reinforcement having Zerewitinoff active hydrogen atoms bonded to the surface thereof into an uncured rubber composition, wherein said rubber composition has pendant blocked isocyanate groups bound thereto; and (3) curing the uncured rubber with sulfur into a desired shape for the rubber article at an elevated temperature sufficient to deblock the isocyanate groups bonded to the uncured rubber allowing for the isocyanate groups to react with the Zerewitinoff active hydrogen atoms bonded to the surface of the polymeric reinforcement, wherein said elevated temperature is a temperature which is within the range of about 140° C. to about 250° C.
Claim 2
Dependent Claim
144 words
A process for preparing a rubber article containing a polymeric reinforcement which consists essentially of the steps of: (1) plasma treating the polymeric reinforcement in a manner whereby reactive groups containing Zerewitinoff active hydrogen atoms are bonded to the surface thereof; (2) incorporating the polymeric reinforcement having Zerewitinoff active hydrogen atoms bonded to the surface thereof into an uncured rubber composition, wherein said rubber composition has pendant blocked isocyanate groups bound thereto; and (3) curing the uncured rubber with sulfur into a desired shape for the rubber article at an elevated temperature sufficient to deblock the isocyanate groups bonded to the uncured rubber allowing for the isocyanate groups to react with the Zerewitinoff active hydrogen atoms bonded to the surface of the polymeric reinforcement, wherein said elevated temperature is a temperature which is within the range of about 140° C. to about 250° C.
Claim 3
Dependent Claim
52 words
A process as specified in claim 1 wherein the pendant blocked isocyanate groups are covalently bonded to the backbone of the rubber and are present in moieties have the structural formula: ##STR13## wherein A represents an alkylene group, an arylene group or an alkarylene group and wherein X represents a blocking agent.
Claim 4
Dependent Claim
28 words
A process as specified in claim 2 wherein the pendant blocked isocyanate groups are present in moieties having the structural formula: ##STR14## wherein X represents the blocking agent.
Claim 5
Dependent Claim
39 words
A process as specified in claim 2 wherein the pendant blocked isocyanate groups are present in moieties having the structural formula: ##STR15## and wherein said moieties are distributed throughout the polymer chains of the rubber in a random manner.
Claim 6
Dependent Claim
19 words
A process as specified in claim 2 wherein the polymeric reinforcement is in the form of a tire cord.
Claim 7
Dependent Claim
16 words
A process as specified in claim 5 wherein the tire cord is a polyester tire cord.
Claim 8
Dependent Claim
16 words
A process as specified in claim 5 wherein the tire cord is a nylon tire cord.
Claim 9
Dependent Claim
15 words
A process as specified in claim 2 wherein the polymeric reinforcement is a polymeric fabric.
Claim 10
Dependent Claim
31 words
A process as specified in claim 2 wherein the reactive groups containing Zerewitinoff active hydrogen atoms are selected from the group consisting of carboxyl groups, hydroxyl groups, amines, hydroperoxides, and mercaptans.
Claim 11
Dependent Claim
19 words
A process as specified in claim 2 wherein the reactive groups bonded to the polymeric reinforcement are hydroxyl groups.
Claim 12
Dependent Claim
14 words
A process as specified in claim 1 wherein the rubber article is a tire.
Claim 13
Dependent Claim
14 words
A process as specified in claim 1 wherein the rubber article is a hose.
Claim 14
Dependent Claim
14 words
A process as specified in claim 1 wherein the rubber article is a belt.
Claim 15
Dependent Claim
34 words
A process as specified in claim 1 wherein the rubber containing blocked isocyanate groups is comprised of repeat units which are derived from at least one conjugated diene monomer and tetrahydro-N- 1-methyl-1- 3-(1-methylethenyl)phenyl!ethyl!-2-oxo-1-H-pyrrolo-1-carboxamide monomer.
Claim 16
Dependent Claim
48 words
A process as specified in claim 1 wherein the pendant blocked isocyanate groups bound to the rubber composition occur in repeat units which have the structural formula: ##STR16## wherein X represents a blocking agent selected from the group consisting of alcohols, cyclic amides, ketoximes, phenols, and secondary amines.
Claim 17
Dependent Claim
21 words
A process as specified in claim 15 wherein the blocking agent is selected from the group consisting of caprolactam and 2-pyrrolidinone.
Claim 18
Dependent Claim
35 words
A process as specified in claim 16 wherein the rubber having pendant blocked isocyanate groups bound thereto has from about 0.005 to about 0.1 moles of blocked isocyanate groups per hundred grams of total weight.
Claim 19
Dependent Claim
39 words
A process as specified in claim 17 wherein the molar ratio of Zerewitinoff active hydrogen containing groups in the polymeric reinforcement to blocked isocyanate groups in the rubber composition is within the range of about 0.6:1 to about 2:1.
Claim 20
Dependent Claim
21 words
A process as specified in claim 15 wherein the blocking agent is selected from the group consisting of a cyclic amide.
Claim 21
Dependent Claim
27 words
A process as specified in claim 4 wherein the elevated temperature is a temperature which is within the range of about 160° C. to about 220° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-26 | 1999-09-25 | 2000-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-26 | 2003-09-25 | 2004-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-26 | 2007-09-25 | 2008-03-26 | $7700.00 | Window Closed / Lapsed |