Patent US4178272A successfully refreshed from Google Patents.
US4178272A
Expired / Lapsed
US
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Hot-melt adhesvies for bonding polyethylene
Assignee: Eastman Chemical Co
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Filing: 1977-03-02
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Granted: 1979-12-11
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Expires: 1997-03-02
Abstract
Abstract The hot-melt adhesives of the present invention comprise a blend of poly(propylene-co-higher 1-olefin), tackifying resin and crystalline propylene containing polymer. These hot-melt adhesive compositions have a novel combination of properties including strong T-peel and lap shear bonds to both low- and high-density polyethylene with excellent creep resistance at ambient temperatures. Therefore, these new hot-melt adhesives are excellent adhesives for applications such as sealing high-density polyethylene grocery bags and low-density shipping bags.
Inventors
- 👤 Max F. Meyer, Jr.
- 👤 Richard L. McConnell
- 👤 Frederick B. Joyner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:47
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/14; C09J123/142; C09J123/18; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
An adhesive composition capable of being used as a hot-melt adhesive comprising a blend of (1) 35 to 88 weight percent substantially amorphous poly(propylene-co-higher 1-olefin), in which the 1-olefin is a member of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, having a melt viscosity of about 10,000 to about 200,000 cp. at 190° C., (2) 10 to 50 weight percent of at least one tackifying resin having a softening point of at least 100° C. selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and (3) 2 to 15 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene, said polypropylene or propylene/ethylene copolymer having a melt viscosity of about 100 to 100,000 cp. at 190° C.
Claim 2
Dependent Claim
131 words
An adhesive composition capable of being used as a hot-melt adhesive comprising a blend of (1) 35 to 88 weight percent substantially amorphous poly(propylene-co-higher 1-olefin), in which the 1-olefin is a member of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, having a melt viscosity of about 10,000 to about 200,000 cp. at 190° C., (2) 10 to 50 weight percent of at least one tackifying resin having a softening point of at least 100° C. selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and (3) 2 to 15 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene, said polypropylene or propylene/ethylene copolymer having a melt viscosity of about 100 to 100,000 cp. at 190° C.
Claim 3
Dependent Claim
23 words
An adhesive composition according to claim 1 wherein said poly(propylene-co-higher 1-olefin) is a propylene/1-hexene copolymer containing 35 to 65 mole percent of 1-hexene.
Claim 4
Dependent Claim
23 words
An adhesive composition according to claim 2 wherein said tackifying resin is hydrocarbon resin having a softening point of at least 100° C.
Claim 5
Dependent Claim
24 words
An adhesive composition according to claim 3 wherein said tackifying resin is a polyterpene resin having a softening point of at least 100° C.
Claim 6
Dependent Claim
131 words
An adhesive composition capable of being used as a hot-melt adhesive comprising a blend of (1) 48 to 67 weight percent substantially amorphous poly(propylene-co-higher 1-olefin), in which the 1-olefin is a member of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, having a melt viscosity of about 10,000 to about 200,000 cp. at 190° C., (2) 25 to 40 weight percent of at least one tackifying resin having a softening point of at least 100° C. selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and (3) 8 to 12 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene, said polypropylene or propylene/ethylene copolymer having a melt viscosity of about 100 to 100,000 cp. at 190° C.
Claim 7
Dependent Claim
131 words
An adhesive composition capable of being used as a hot-melt adhesive comprising a blend of (1) 48 to 67 weight percent substantially amorphous poly(propylene-co-higher 1-olefin), in which the 1-olefin is a member of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, having a melt viscosity of about 10,000 to about 200,000 cp. at 190° C., (2) 25 to 40 weight percent of at least one tackifying resin having a softening point of at least 100° C. selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and (3) 8 to 12 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene, said polypropylene or propylene/ethylene copolymer having a melt viscosity of about 100 to 100,000 cp. at 190° C.
Claim 8
Dependent Claim
23 words
An adhesive composition according to claim 5 wherein said poly(propylene-co-higher 1-olefin) is a propylene/1-hexene copolymer containing 35 to 65 mole percent of 1-hexene.
Claim 9
Dependent Claim
23 words
An adhesive composition according to claim 6 wherein said tackifying resin is hydrocarbon resin having a softening point of at least 100° C.
Claim 10
Dependent Claim
24 words
An adhesive composition according to claim 6 wherein said tackifying resin is a polyterpene resin having a softening point of at least 100° C.
References Cited (Backward Citations)
US3341626A
Cited
US3529037A
Cited
US3634546A
Cited
US3888949A
Cited
US3954697A
Cited
US4022728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |