Patent US4143858A successfully refreshed from Google Patents.
US4143858A
Expired / Lapsed
US
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Substantially amorphous polyolefins useful as pressure-sensitive adhesives
Assignee: Eastman Chemical Co
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Filing: 1977-08-29
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Granted: 1979-03-13
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Expires: 1997-08-29
Abstract
Abstract The invention relates to a process for the treatment of substantially amorphous polyolefins to provide permanently tacky, low viscosity materials which have useful pressure-sensitive adhesive properties. These permanently tacky amorphous polyolefin homo- and copolymers, as well as blends of such amorphous polyolefins with crystalline polyolefins containing up to 20 weight percent crystalline polyolefin, are novel pressure-sensitive adhesives.
Inventors
- 👤 Robert R. Schmidt, III
- 👤 Jerry D. Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:50
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C08; C08F; C08F8/00; C08F8/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
A process for preparing tacky modified amorphous polyolefin compositions useful as pressure-sensitive adhesives which comprises reacting substantially amorphous polyolefin having a melt viscosity of about 100 to 200,000 cp. at 190° C. with about 0.075 weight percent of at least one strong Lewis acid catalyst at temperatures of at least 250° C. to provide a low viscosity, permanently tacky hot-melt pressure-sensitive adhesive.
Claim 2
Dependent Claim
62 words
A process for preparing tacky modified amorphous polyolefin compositions useful as pressure-sensitive adhesives which comprises reacting substantially amorphous polyolefin having a melt viscosity of about 100 to 200,000 cp. at 190° C. with about 0.075 weight percent of at least one strong Lewis acid catalyst at temperatures of at least 250° C. to provide a low viscosity, permanently tacky hot-melt pressure-sensitive adhesive.
Claim 3
Dependent Claim
80 words
A process according to claim 1 wherein said substantially amorphous polyolefin is a member of the group selected from substantially amorphous homopolymers of 1-olefins containing 3 to 5 carbon atoms, substantially amorphous copolymers prepared from either ethylene and 1-olefins containing 3 to 5 carbon atoms or propylene and 1-butene, and amorphous propylene or 1-butene/higher 1-olefin copolymers containing less than 40 mole percent of at least one higher 1-olefin of the group consisting essentially of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene.
Claim 4
Dependent Claim
15 words
A process according to claim 2 wherein said strong Lewis acid catalyst is aluminum trichloride.
Claim 5
Dependent Claim
15 words
A process according to claim 2 wherein said strong Lewis acid catalyst is aluminum tribromide.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |