US3787531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive adhesives comprising a block copolymer and a tackifier
Assignee: 3M Co
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Filing: 1971-05-24
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Granted: 1974-01-22
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Expires: 1991-05-24
Abstract
Abstract NORMALLY TACKY PRESSURE-SENSITIVE ADHESIVES AND ADHESIVE TAPES HAVING EXCELLENT SHEAR STRENGTH AND CREEP RESISTANCE, PARTICULARLY AT ELEVATED TEMPERATURES, TOGETHER WITH GOOD PEEL STRENGTH AND TACK PROPERTIES, ARE OBTAINED BY COMBINING TACKIFYING RESIN WITH LOW MOLECULAR WEIGHT A-B BLOCK COPOLYMER. THE COPOLYMER A BLOCK IS NORMOLLY GLASSY AND HAS A GLASS TRANSITION TEMPERATURE ABOVE 75*C. WHILE THE COPOLYMER B BLOCK IS AMORPHOUS AND ELASTOMERIC AT TEMPERATURES ABOVE -20*C. SHEAR STRENGTH OF THE ADHESIVE MAY BE INCREASED BY ADDITION OF BLOCK COPOLYMERS CONTAINING THREE OR MORE BLOCKS.
Inventors
- 👤 C Dahlquist
- 👤 V Kolpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:04
CPC Classifications
C; C09; C09D; C09D153/00; C09J; C09J153/00; C09J7/00; C09J7/20; C09J7/21; C09J7/22; C09J7/30; C09J7/38; C09J7/381; C09J7/387; C08; C08L; C08L2666/00; C08L2666/02; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T428/2874; Y10T428/2878; Y10T428/2883
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |