US4076670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-melt adhesives having improved properties at elevated temperatures
Assignee: Eastman Chemical Co
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Filing: 1977-01-27
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Granted: 1978-02-28
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Expires: 1997-01-27
Abstract
Abstract The hot melt adhesives of the present invention comprise a blend of polyethylene, tackifying resin, and crystalline propylene containing polymer. These hot melt adhesive compositions have a novel combination of properties including high strength at elevated temperatures and pressures and resistance to creep.
Inventors
- 👤 Darryl A. Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:30
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/06; C09J123/10; C08; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
108 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 30 to 70 weight percent polyethylene having a melt index at 190° C. of about 1 to about 50 and a density of about 0.910 g/cm 3 to about 0.940 g/cm 3 (2) 10 to 50 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and (3) 10 to 40 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene having a melt flow rate at 230° C. of 30 to 180.
Claim 2
Dependent Claim
108 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 30 to 70 weight percent polyethylene having a melt index at 190° C. of about 1 to about 50 and a density of about 0.910 g/cm 3 to about 0.940 g/cm 3 (2) 10 to 50 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and (3) 10 to 40 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene having a melt flow rate at 230° C. of 30 to 180.
Claim 3
Dependent Claim
37 words
An adhesive composition according to claim 1 wherein said polyethylene has a melt index at 190° C. of about 1 to about 50 and a density of about 0.920 g/cm 3 to about 0.930 g/cm 3 .
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 2 wherein said tackifying resin is a polyterpene resin having a softening point of at least 100° C.
Claim 6
Dependent Claim
36 words
An adhesive composition according to claim 2 wherein said crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent ethylene by weight has a melt flow rate at 230° C. of 120 to 180.
Claim 7
Dependent Claim
108 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 10 to about 30 and a density of about 0.920 g/cm 3 to about 0.930 g/cm 3 , (2) 20 to 40 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline polypropylene having a melt flow rate at 230° C. of 30 to 180.
Claim 8
Dependent Claim
108 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 10 to about 30 and a density of about 0.920 g/cm 3 to about 0.930 g/cm 3 , (2) 20 to 40 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline polypropylene having a melt flow rate at 230° C. of 30 to 180.
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 120° 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 120° C.
Claim 11
Dependent Claim
23 words
An adhesive composition according to claim 6 wherein said crystalline polypropylene has a melt flow rate at 230° C. of 120 to 180.
Claim 12
Dependent Claim
98 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 20 and a density of about 0.925 g/cm 3 , (2) 30 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline polypropylene having a melt flow rate at 230° C. of 30 to 180.
Claim 13
Dependent Claim
98 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 20 and a density of about 0.925 g/cm 3 , (2) 30 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline polypropylene having a melt flow rate at 230° C. of 30 to 180.
Claim 14
Dependent Claim
23 words
An adhesive composition according to claim 10 wherein said tackifying resin is hydrocarbon resin having a softening point of at least 120° C.
Claim 15
Dependent Claim
24 words
An adhesive composition according to claim 10 wherein said tackifying resin is a polyterpene resin having a softening point of at least 120° C.
Claim 16
Dependent Claim
23 words
An adhesive composition according to claim 10 wherein said crystalline polypropylene has a melt flow rate at 230° C. of 120 to 180.
Claim 17
Dependent Claim
114 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 10 to about 30 and a density of about 0.920 g/cm 3 to about 0.930 g/cm 3 , (2) 20 to 40 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline ethylene/propylene copolymer containing 1.4 weight percent ethylene having a melt flow rate at 230° C. of 30 to 180.
Claim 18
Dependent Claim
114 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 10 to about 30 and a density of about 0.920 g/cm 3 to about 0.930 g/cm 3 , (2) 20 to 40 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline ethylene/propylene copolymer containing 1.4 weight percent ethylene having a melt flow rate at 230° C. of 30 to 180.
Claim 19
Dependent Claim
23 words
An adhesive composition according to claim 14 wherein said tackifying resin is hydrocarbon resin having a softening point of at least 120° C.
Claim 20
Dependent Claim
24 words
An adhesive composition according to claim 14 wherein said tackifying resin is a polyterpene resin having a softening point of at least 120° C.
Claim 21
Dependent Claim
29 words
An adhesive composition according to claim 14 wherein said crystalline ethylene/propylene copolymer containing 1.4 weight percent ethylene has a melt flow rate at 230° C. of 120 to 180.
Claim 22
Dependent Claim
107 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 20 and a density of about 0.925 g/cm 3 , (2) 30 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline ethylene/propylene copolymer containing not more than 20 weight percent ethylene having a melt flow rate at 230° C. of 30 to 180.
Claim 23
Dependent Claim
107 words
An adhesive composition capable of being used as a hot melt adhesive comprising a blend of (1) 35 to 45 weight percent polyethylene having a melt index at 190° C. of about 20 and a density of about 0.925 g/cm 3 , (2) 30 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters having a ring and ball softening point of at least 100° C., and (3) 25 to 35 weight percent crystalline ethylene/propylene copolymer containing not more than 20 weight percent ethylene having a melt flow rate at 230° C. of 30 to 180.
Claim 24
Dependent Claim
23 words
An adhesive composition according to claim 18 wherein said tackifying resin is hydrocarbon resin having a softening point of at least 120° C.
Claim 25
Dependent Claim
24 words
An adhesive composition according to claim 18 wherein said tackifying resin is a polyterpene resin having a softening point of at least 120° C.
Claim 26
Dependent Claim
29 words
An adhesive composition according to claim 18 wherein said crystalline ethylene/propylene copolymer containing 1.4 weight percent ethylene has a melt flow rate at 230° C. of 120 to 180.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |