US3867270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV curing of conjugated diene-containing butyl rubber
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-09-13
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Granted: 1975-02-18
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Expires: 1993-09-13
Abstract
Abstract Conjugated diene-containing butyl rubber is cured with ultra violet radiation, with the aid of certain photosensitizers. Provides for new class of sealants and mastic compounds based on butyl rubber.
Inventors
- 👤 Alberto Malatesta
- 👤 Francis P Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:46
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123; C; C08; C08K; C08K5/00; C08K5/04; C08K5/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
A METHOD OF VULCANIZING A COPOLYMER CONSISTING OF 85 TO 99.5% BY WEIGHT OF AN ISOOLEFIN HAVING ABOUT 4 TO ABOUT 7 CARBON ATOMS COMBINED WITH 15 TO ABOUT 0.5% BY WEIGHT OF A CONJUGATED DIOLEFIN HAVING ABOUT 4 TO ABOUT 14 CARBON ATOMS CONTAINING IN THE LINEAR BACKBONE CONJUGATED DIENE UNSATURATION WHICH COMPRISES BLENDING WITH SAID RUBBER FROM 0.01 TO 5.0 PARTS OF AN ULTRAVIOLET LIGHT-RESPONSIVE PHOTOSENSITIZER PER 100 PARTS OF SAID RUBBER (PHR) WHEREIN SAID PHOTOSENSITIZER IS SELECTED FROM THE GROUP CONSISTING OF BENZOPHENONE, PROPIOPHENONE, CYCLOPROPYL PHENYL KETONE, ACETOPHENONE, 1,3,5TRIACETYL BENZENE, BENZALDEHYDE, THIOXANTHANE, AUTHRAQUINONE, B-NAPHTHYL PHENYL KETONE, B-NAPHTHALDEHYDE, BACETONAPHTHONE, 2,3-PENTANEDIONE, BENZIL, FLUORENONE, PYRENE, BENZANTHRONE, AND ANTHRACENE, AND SUBSEQUENTLY EXPOSING SAID BLEND TO ULTRAVIOLET RADIATION FOR A TIME SUFFICIENT TO CROSSLINK AT LEAST 70 PERCENT OF SAID RUBBER.
Claim 2
Independent Claim
129 words
A METHOD OF VULCANIZING A COPOLYMER CONSISTING OF 85 TO 99.5% BY WEIGHT OF AN ISOOLEFIN HAVING ABOUT 4 TO ABOUT 7 CARBON ATOMS COMBINED WITH 15 TO ABOUT 0.5% BY WEIGHT OF A CONJUGATED DIOLEFIN HAVING ABOUT 4 TO ABOUT 14 CARBON ATOMS CONTAINING IN THE LINEAR BACKBONE CONJUGATED DIENE UNSATURATION WHICH COMPRISES BLENDING WITH SAID RUBBER FROM 0.01 TO 5.0 PARTS OF AN ULTRAVIOLET LIGHT-RESPONSIVE PHOTOSENSITIZER PER 100 PARTS OF SAID RUBBER (PHR) WHEREIN SAID PHOTOSENSITIZER IS SELECTED FROM THE GROUP CONSISTING OF BENZOPHENONE, PROPIOPHENONE, CYCLOPROPYL PHENYL KETONE, ACETOPHENONE, 1,3,5TRIACETYL BENZENE, BENZALDEHYDE, THIOXANTHANE, AUTHRAQUINONE, B-NAPHTHYL PHENYL KETONE, B-NAPHTHALDEHYDE, BACETONAPHTHONE, 2,3-PENTANEDIONE, BENZIL, FLUORENONE, PYRENE, BENZANTHRONE, AND ANTHRACENE, AND SUBSEQUENTLY EXPOSING SAID BLEND TO ULTRAVIOLET RADIATION FOR A TIME SUFFICIENT TO CROSSLINK AT LEAST 70 PERCENT OF SAID RUBBER.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the vulcanization is conducted at a temperature of from -60* up to 200*C.
Claim 4
Dependent Claim
10 words
The method of claim 1, wherein the photosensitizer is benzophenone.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein the blend is first shaped by extrusion, followed by UV curing.
Claim 6
Dependent Claim
99 words
A vulcanizable composition comprising a. a copolymer consisting of 85 to 99.5% by weight of an isoolefin having about 4 to about 7 carbon atoms combined with 15 to about 0.5% by weight of a conjugated diolefin having about 4 to about 14 carbon atoms containing in the linear backbone conjugated diene unsaturation; and b. from 0.01 to 5.0 phr of a UV-responsive photosensitizer wherein said photosensitizer is selected from the group consisting of benzophenone, propiophenone, cyclopropyl phenyl ketone, acetophenone, 1,3,5-triacetylbenzene, benzaldehyde, thioxanthane, authraquinone, Beta -naphthyl phenyl ketone, Beta -naphthaldehyde, Beta -acetonaphthone, 2,3-pentanedione, benzil, fluorenone, pyrene, benzanthrone, and anthracene.
Claim 7
Dependent Claim
99 words
A vulcanizable composition comprising a. a copolymer consisting of 85 to 99.5% by weight of an isoolefin having about 4 to about 7 carbon atoms combined with 15 to about 0.5% by weight of a conjugated diolefin having about 4 to about 14 carbon atoms containing in the linear backbone conjugated diene unsaturation; and b. from 0.01 to 5.0 phr of a UV-responsive photosensitizer wherein said photosensitizer is selected from the group consisting of benzophenone, propiophenone, cyclopropyl phenyl ketone, acetophenone, 1,3,5-triacetylbenzene, benzaldehyde, thioxanthane, authraquinone, Beta -naphthyl phenyl ketone, Beta -naphthaldehyde, Beta -acetonaphthone, 2,3-pentanedione, benzil, fluorenone, pyrene, benzanthrone, and anthracene.
Claim 8
Dependent Claim
27 words
The composition of claim 5 wherein there is also present rubber fillers selected from the group consisting of mineral filler, oil, or mixtures of filler and oil.
Claim 9
Dependent Claim
10 words
The composition of claim 5, wherein the photosensitizer is benzophenone.
Claim 10
Dependent Claim
15 words
The composition of claim 5, wherein there is from 0.1 to 3.0 phr of photosensitizer.
Claim 11
Dependent Claim
9 words
A mastic prepared from the composition of claim 5.
Claim 12
Dependent Claim
9 words
A sealant prepared from the composition of claim 5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |