US4250272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive compositions
Assignee: Shell USA Inc
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Filing: 1979-05-11
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Granted: 1981-02-10
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Expires: 1999-05-11
Abstract
Abstract A process for selecting a C 5 -based hydrocarbon tackifying resin to be used in an adhesive composition with a monoalkenyl arene conjugated diene block copolymer is disclosed. Pursuant to the selection process, a novel tackifying resin having an unobvious balance of properties is also disclosed, along with its combination with an elastomeric block copolymer in an adhesive composition.
Inventors
- 👤 Earle E. Ewins, Jr.
- 👤 deceased Cocker Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:55
CPC Classifications
C; C09; C09J; C09J153/00; C09J153/02; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
An adhesive composition comprising 100 parts by weight of a block copolymer component and 20 to 300 parts by weight of a tackifying resin component wherein: (a) said block copolymer component comprises a mixture of a linear or radial ABA type block copolymer and an AB two block copolymer where the A blocks are polystyrene blocks and the B blocks are polybutadiene or polyisoprene blocks; and (b) said tackifying resin component has a softening point of 70° to 100° C., a number average molecular weight of 1,000 to 1,600, and comprises from about 80 to 91 percent by weight units derived from piperylene, from about 1 to about 8 percent by weight units derived from isobutylene and from about 8 to about 12 percent by weight units derived from alphamethyl styrene.
Claim 2
Dependent Claim
131 words
An adhesive composition comprising 100 parts by weight of a block copolymer component and 20 to 300 parts by weight of a tackifying resin component wherein: (a) said block copolymer component comprises a mixture of a linear or radial ABA type block copolymer and an AB two block copolymer where the A blocks are polystyrene blocks and the B blocks are polybutadiene or polyisoprene blocks; and (b) said tackifying resin component has a softening point of 70° to 100° C., a number average molecular weight of 1,000 to 1,600, and comprises from about 80 to 91 percent by weight units derived from piperylene, from about 1 to about 8 percent by weight units derived from isobutylene and from about 8 to about 12 percent by weight units derived from alphamethyl styrene.
Claim 3
Dependent Claim
57 words
The adhesive composition of claim 1 wherein said tackifying resin has a softening point of about 85° C., a number average molecular weight of about 1,400, and comprises about 84 percent by weight units derived from piperylene, about 11 percent by weight units derived from alphamethyl styrene, and about 5 percent by weight units derived from isobutylene.
Claim 4
Dependent Claim
35 words
The adhesive composition of claim 1 wherein said block copolymer component comprises 40 to 95 parts by weight of the ABA-type block copolymer and 60 to 5 parts by weight of the AB-type block copolymer.
Claim 5
Dependent Claim
14 words
An adhesive composition according to claim 1 wherein said B blocks are polyisoprene blocks.
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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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |