US4150170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet initiator systems for pressure-sensitive adhesives
Assignee: Celanese Corp
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Filing: 1978-03-02
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Granted: 1979-04-17
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Expires: 1998-03-02
Abstract
Abstract An improved process and product for use in ultraviolet curable pressure-sensitive adhesives is disclosed. The product, a standard ultraviolet curable pressure-sensitive adhesive to which has been added a benzoin C 1 -C 12 hydrocarbon alkyl ether and a triplet state sensitizer, exhibits adhesive strength properties which are substantially greater than those of prior art systems.
Inventors
- 👤 Nelson R. Lazear
- 👤 Robert W. Stackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:26
CPC Classifications
C; C09; C09J; C09J4/00; C09J4/06; C08; C08F; C08F291/00; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C09J7/385
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A process for preparing a pressure-sensitive adhesive having improved strength properties which comprises: (a) forming a pressure-sensitive ultraviolet reactive composition containing alpha beta ethylenically unsaturated vinyl polymerizable monomers and, based upon the polymerizable system, about 0.5 to about 20 percent, by weight, of a benzoin C 1 -C 12 hydrocarbon alkyl ether and about 0.001 to about 1.0 percent, by weight on the same basis, of a triplet state sensitizer having a triplet state energy of about 40 to about 60 k cal/mol; (b) applying the resulting composition to a substrate to a film thickness of about 0.1 to about 5 mils; and (c) subjecting the coated substrate to ultraviolet radiation for about 0.1 to about 1 minute per linear foot; wherein the glass transition temperature of the pressure-sensitive composition is about -10° to -60° C.
Claim 2
Dependent Claim
136 words
A process for preparing a pressure-sensitive adhesive having improved strength properties which comprises: (a) forming a pressure-sensitive ultraviolet reactive composition containing alpha beta ethylenically unsaturated vinyl polymerizable monomers and, based upon the polymerizable system, about 0.5 to about 20 percent, by weight, of a benzoin C 1 -C 12 hydrocarbon alkyl ether and about 0.001 to about 1.0 percent, by weight on the same basis, of a triplet state sensitizer having a triplet state energy of about 40 to about 60 k cal/mol; (b) applying the resulting composition to a substrate to a film thickness of about 0.1 to about 5 mils; and (c) subjecting the coated substrate to ultraviolet radiation for about 0.1 to about 1 minute per linear foot; wherein the glass transition temperature of the pressure-sensitive composition is about -10° to -60° C.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the glass transition temperature of the pressure-sensitive composition is about -10° to about -45° C.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the ultraviolet radiation has a wave length in the range of about 2000-5000 Angstroms.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the triplet state sensitizer is eosin-Y and the benzoin alkyl ether is benzoin isobutyl ether.
References Cited (Backward Citations)
US4028204A
Cited
US4065368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |