US4983684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinkable rubber composition
Assignee: Goodyear Tire and Rubber Co
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Filing: 1989-02-27
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Granted: 1991-01-08
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Expires: 2009-02-27
Abstract
Abstract It is sometimes desirable to cure rubber compositions utilizing non-sulfur curing agents. The subject invention reveals rubber compositions which can be cured without utilizing sulfur or sulfur containing compounds. The subject invention more specifically disclosed a rubber composition which can be crosslinked by heating which is comprised of (1) at least one rubber having pendant blocked isocyanate groups bound thereto; and (2) at least one compound which contains at least 2 Zerewitinoff active hydrogens. This invention also discloses crosslinking of elastomer compounds containing (1) at least one rubber having functionalized groups containing at least one Zerewitinoff active hydrogen and (2) at least one compound which contains at least two blocked isocyanate groups. This invention also discloses self-curing elastomers containing both blocked isocyanate groups and groups containing at least one active Zerewitinoff hydrogen.
Inventors
- 👤 Arthur H. Weinstein
- 👤 Howard A. Colvin
- 👤 Dane K. Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:24
CPC Classifications
C; C08; C08L; C08L15/00; C08J; C08J3/00; C08J3/24; C08C; C08C19/00; C08C19/30; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08G18/70; C08G18/72; C08G18/728; C08J2321/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
40 words
A rubber composition which can be crosslinked by heating which is comprised of (1) at least one dry rubber having pendant blocked isocyanate groups bound thereto; and (2) at least one compound which contains at least 2 Zerewitinoff active hydrogens.
Claim 2
Dependent Claim
40 words
A rubber composition which can be crosslinked by heating which is comprised of (1) at least one dry rubber having pendant blocked isocyanate groups bound thereto; and (2) at least one compound which contains at least 2 Zerewitinoff active hydrogens.
Claim 3
Dependent Claim
40 words
A rubber composition which can be crosslinked by heating which is comprised of (1) at least one dry rubber having Zerewitinoff active hydrogens bound thereto; and (2) at lest one compound having at least 2 blocked isocyanate groups bound thereto.
Claim 4
Dependent Claim
40 words
A rubber composition which can be crosslinked by heating which is comprised of (1) at least one dry rubber having Zerewitinoff active hydrogens bound thereto; and (2) at lest one compound having at least 2 blocked isocyanate groups bound thereto.
Claim 5
Dependent Claim
36 words
A rubber composition which can be crosslinked by heating which is comprised of polymer chains having (1) pendant blocked isocyanate groups bound thereto; and (2) Zerewitinoff active hydrogens bound thereto, wherein the rubber composition is dry.
Claim 6
Dependent Claim
36 words
A rubber composition which can be crosslinked by heating which is comprised of polymer chains having (1) pendant blocked isocyanate groups bound thereto; and (2) Zerewitinoff active hydrogens bound thereto, wherein the rubber composition is dry.
Claim 7
Dependent Claim
21 words
A process for curing the rubber composition specified in claim 1 which comprises heating said rubber composition to an elevated temperature.
Claim 8
Dependent Claim
21 words
A process for curing the rubber composition specified in claim 2 which comprises heating the rubber composition to an elevated temperature.
Claim 9
Dependent Claim
21 words
A process for curing the rubber composition specified in claim 3 which comprises heating said rubber composition to an elevated temperature.
Claim 10
Dependent Claim
33 words
A rubber composition as specified in claim 1 wherein said Zerewitinoff active hydrogens are present in a moiety selected from the group consisting of hydroxyl groups, amine groups, carboxyl groups, and thiol groups.
Claim 11
Dependent Claim
19 words
A rubber composition as specified in claim 1 wherein said Zerewitinoff active hydrogen is present in a hydroxyl group.
Claim 12
Dependent Claim
19 words
A rubber composition as specified in claim 1 wherein the pendant blocked isocyanate groups are derived from m-isopropenylα,α-dimethyl benzylisocyanate.
Claim 13
Dependent Claim
17 words
A rubber composition as specified in claim 9 wherein said isocyanate groups are blocked with cyclic amides.
Claim 14
Dependent Claim
14 words
A rubber composition as specified in claim 10 wherein said cyclic amide is 2-pyrrolidone.
Claim 15
Dependent Claim
14 words
A rubber composition as specified in claim 10 wherein said cyclic amide is caprolactam.
Claim 16
Dependent Claim
22 words
A rubber composition as specified in claim 11 wherein the compound which contains at least two Zerewitinoff active hydrogens is tetramethylene glycol.
Claim 17
Dependent Claim
22 words
A rubber composition as specified in claim 12 wherein the compound which contains at least two Zerewitinoff active hydrogens is tetramethylene glycol.
Claim 18
Dependent Claim
28 words
A rubber composition as specified in claim 1 which further comprises a catalyst selected from the group consisting of dibutyltin dilaurate, dimethyltin dilaurate, dibutyltin diacetate, and dimethyltin diacetate.
Claim 19
Dependent Claim
36 words
A rubber composition as specified in claim 1 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 20
Dependent Claim
35 words
A rubber composition as specified in claim 16 wherein the ratio of Zerewitinoff active hydrogen containing groups to blocked isocyanate groups in the rubber composition is within the range of about 0.6:1 to about 2:1.
Claim 21
Dependent Claim
20 words
A rubber composition as specified in claim 1 wherein the rubber having pendant blocked isocyanate groups is a nitrile rubber.
Claim 22
Dependent Claim
20 words
A rubber composition as specified in claim 1 wherein the rubber having pendant blocked isocyanate groups is a styrene-butadiene rubber.
Claim 23
Dependent Claim
21 words
A rubber composition as specified in claim 3 wherein the polymer chains contain repeat units which are derived from β-hydroxyethyl methacrylate.
References Cited (Backward Citations)
US3926875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |