US3932328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt adhesive composition and tape
Assignee: Avery Dennison Corp
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Filing: 1973-10-17
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Granted: 1976-01-13
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Expires: 1993-10-17
Abstract
Abstract A hot melt pressure-sensitive adhesive composition and tape wherein the adhesive comprises an elastomeric component based on an elastomeric and thermoplastic A-B-A block copolymer wherein the B blocks are derived from isoprene and the A blocks are derived from styrene, and a unique tackifier component based on a blend of solid and liquid tackifier resins. The elastomeric and tackifier components are combined in specific proportions, as are the solid and liquid tackifier resins in the tackifier component. Preferred solid and liquid tackifier resins are disclosed.
Inventors
- 👤 Ralf Korpman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:41
CPC Classifications
C; C09; C09J; C09J153/00; C09J153/02; C09J201/00; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C09J7/387; C08; C08L; C08L2666/00; C08L2666/02; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T428/2857; Y10T428/2878; Y10T428/2883; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A substantially oil-free hot melt pressure-sensitive adhesive composition comprising an elastomeric component which comprises a major amount by weight of said component of an A-B-A block copolymer wherein B is an elastomeric polymer block derived from isoprene and A is a thermoplastic polymer block derived from styrene, said A blocks constituting about 8-35 percent by weight of the block copolymer; and about 125-300 parts per one hundred parts by weight of the elastomeric component of a tackifying component consisting essentially of a blend of normally solid and liquid tackifier resins, the proportion of solid resin to liquid resin in the blend being between about 4 to 1 and 1 to 3, said solid resins being normally friable at about 25° C. and said liquid resins being in a liquid state at about 25° C., and said solid resins consisting essentially of polymerized structures derived from aliphatic dienes and mono-olefins of 5 or 6 carbon atoms, at least 40 percent by weight of said structures being derived from piperylene or from piperylene and isoprene.
Claim 2
Dependent Claim
173 words
A substantially oil-free hot melt pressure-sensitive adhesive composition comprising an elastomeric component which comprises a major amount by weight of said component of an A-B-A block copolymer wherein B is an elastomeric polymer block derived from isoprene and A is a thermoplastic polymer block derived from styrene, said A blocks constituting about 8-35 percent by weight of the block copolymer; and about 125-300 parts per one hundred parts by weight of the elastomeric component of a tackifying component consisting essentially of a blend of normally solid and liquid tackifier resins, the proportion of solid resin to liquid resin in the blend being between about 4 to 1 and 1 to 3, said solid resins being normally friable at about 25° C. and said liquid resins being in a liquid state at about 25° C., and said solid resins consisting essentially of polymerized structures derived from aliphatic dienes and mono-olefins of 5 or 6 carbon atoms, at least 40 percent by weight of said structures being derived from piperylene or from piperylene and isoprene.
Claim 3
Dependent Claim
28 words
A pressure-sensitive adhesive composition according to claim 1, wherein said liquid tackifier resins are selected from the group consisting of liquid hydrocarbons, liquid rosin esters and liquid polystyrenes.
Claim 4
Dependent Claim
21 words
A pressure-sensitive adhesive composition according to claim 1, wherein said solid tackifier resins have a softening point above about 60° C.
Claim 5
Dependent Claim
36 words
A pressure-sensitive adhesive composition according to claim 1, wherein said solid tackifier resins have a number average molecular weight above about 900 and said liquid tackifier resins have a number average molecular weight below about 700.
Claim 6
Dependent Claim
49 words
A pressure-sensitive adhesive composition according to claim 1, wherein said liquid tackifier resins also consist essentially of polymerized structures derived from aliphatic dienes and mono-olefins of 5 or 6 carbon atoms, at least 40 percent by weight of said structures being derived from piperylene or from piperylene and isoprene.
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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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |