Patent US4072735A successfully refreshed from Google Patents.
US4072735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt pressure sensitive adhesives
Assignee: Eastman Chemical Co
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Filing: 1976-06-03
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Granted: 1978-02-07
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Expires: 1996-06-03
Abstract
Abstract The hot melt pressure sensitive adhesives of the present invention comprise a blend of ethylene-propylene rubber, tackifying resin, and polybutene. The hot melt adhesive blend may also contain crystalline polypropylene. This hot melt pressure sensitive adhesive has a novel combination of properties including good resistance to plasticizer migration and good heat stability.
Inventors
- 👤 Loyce A. Ardemagni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/18; C09J123/20; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C08; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
An adhesive composition capable of being used as a hot melt pressure sensitive adhesive comprising a blend of 1. 5 to 15 weight percent ethylene-propylene rubber, 2. 30 to 60 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon tackifier resins, polyterpene resins, and rosin esters, and 3. 20 to 50 weight percent polybutylene.
Claim 2
Dependent Claim
60 words
An adhesive composition capable of being used as a hot melt pressure sensitive adhesive comprising a blend of 1. 5 to 15 weight percent ethylene-propylene rubber, 2. 30 to 60 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon tackifier resins, polyterpene resins, and rosin esters, and 3. 20 to 50 weight percent polybutylene.
Claim 3
Dependent Claim
43 words
An adhesive composition according to claim 1 wherein said ethylene-propylene rubber has an ethylene content of from 50 to 90 weight percent, contains 0 to 5 mole percent unsaturation, and has a flow rate at 230° C. of about 0.2 to about 0.8.
Claim 4
Dependent Claim
14 words
An adhesive composition according to claim 2 wherein said tackifying resin is hydrocarbon resin.
Claim 5
Dependent Claim
41 words
An adhesive composition according to claim 3 wherein said polybutylene are polymers having a molecular weight of from 300 to 3,000 and are composed predominantly of monoolefins having four carbon atoms (85 to 98 percent by weight), the remainder being isoparaffins.
Claim 6
Dependent Claim
68 words
An adhesive composition capable of being used as a hot melt pressure sensitive adhesive comprising a blend of 1. 5 to 15 weight percent ethylene-propylene rubber, 2. 30 to 60 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon tackifier resins, polyterpene resins, and rosin esters, 3. 20 to 50 weight percent polybutylene, and 4. 1 to 5 weight percent crystalline polypropylene.
Claim 7
Dependent Claim
68 words
An adhesive composition capable of being used as a hot melt pressure sensitive adhesive comprising a blend of 1. 5 to 15 weight percent ethylene-propylene rubber, 2. 30 to 60 weight percent of at least one tackifying resin selected from the group consisting of hydrocarbon tackifier resins, polyterpene resins, and rosin esters, 3. 20 to 50 weight percent polybutylene, and 4. 1 to 5 weight percent crystalline polypropylene.
Claim 8
Dependent Claim
43 words
An adhesive composition according to claim 5 wherein said ethylene-propylene rubber has an ethylene content of from 50 to 90 weight percent, contains 0 to 5 mole percent unsaturation, and has a flow rate at 230° C. of about 0.2 to about 0.8.
Claim 9
Dependent Claim
14 words
An adhesive composition according to claim 6 wherein said tackifying resin is hydrocarbon resin.
Claim 10
Dependent Claim
41 words
An adhesive composition according to claim 7 wherein said polybutylene are polymers having a molecular weight of from 300 to 3,000 and are composed predominantly of monoolefins having 4 carbon atoms (85 to 98 percent by weight) the remainder being isoparaffins.
Claim 11
Dependent Claim
26 words
An adhesive composition according to claim 8 wherein said crystalline polypropylene has an inherent viscosity as measured in tetralin at 145° C. of 0.5 to 4.0.
References Cited (Backward Citations)
US3514417A
Cited
US3492372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |