US4248748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-activated adhesive
Assignee: 3M Co
•
Filing: 1980-02-04
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Granted: 1981-02-03
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Expires: 2000-02-04
Abstract
Abstract Heat-activated adhesive comprising a pressure-sensitive-adhesive acrylate polymer and a tackifying resin, the latter being included in sufficient amount to lower the pressure-sensitive adhesion of the complete heat-activated adhesive to levels needed for convenient and effective room-temperature handling of sheets coated with the adhesive, while leaving the adhesive with the capacity for strong heat-activated bonds.
Inventors
- 👤 Joseph M. McGrath
- 👤 Daryl D. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C09J7/00; C09J7/30; C09J7/35; C08; C08L; C08L2666/00; C08L2666/02; C09J2301/00; C09J2301/30; C09J2301/304; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797; Y10T428/31844
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
Heat-activated adhesive comprising (a) an acrylate polymer capable of room-temperature pressure-sensitive adhesion of at least 100 grams per centimeter width; and (b) room-temperature-solid tackifying resin that provides increased room-temperature tackiness when added in at least some amounts to said acrylate resin or natural rubber, but which is included in said heat-activated adhesive in an amount sufficient to reduce room-temperature pressure-sensitive preadhesion of the adhesive to less than the pressure-sensitive adhesion of the acrylate polymer prior to addition of the tackifying resin.
Claim 2
Dependent Claim
81 words
Heat-activated adhesive comprising (a) an acrylate polymer capable of room-temperature pressure-sensitive adhesion of at least 100 grams per centimeter width; and (b) room-temperature-solid tackifying resin that provides increased room-temperature tackiness when added in at least some amounts to said acrylate resin or natural rubber, but which is included in said heat-activated adhesive in an amount sufficient to reduce room-temperature pressure-sensitive preadhesion of the adhesive to less than the pressure-sensitive adhesion of the acrylate polymer prior to addition of the tackifying resin.
Claim 3
Dependent Claim
16 words
Adhesive of claim 1 in which isooctyl acrylate is a monomeric ingredient of the acrylate polymer.
Claim 4
Dependent Claim
21 words
Adhesive of claim 1 or 2 in which the tackifying resin comprises naturally occurring rosin or modified forms of such rosin.
Claim 5
Dependent Claim
9 words
Adhesive of claim 1 which further includes phenolic resin.
Claim 6
Dependent Claim
91 words
Heat-activated adhesive comprising (a) an acrylate polymer capable of room-temperature pressure-sensitive adhesion of at least 200 grams per centimeter width; and (b) room-temperature-solid tackifying resin that provides increased room-temperature tackiness when added in at least some amounts to said acrylate resin or natural rubber, but which is included in said heat-activated adhesive in an amount sufficient to reduce room-temperature pressure-sensitive preadhesion of the adhesive to a value between 35 and 350 grams/centimeter, and which is less than the pressure-sensitive adhesion of the acrylate polymer prior to addition of the tackifying resin.
Claim 7
Dependent Claim
91 words
Heat-activated adhesive comprising (a) an acrylate polymer capable of room-temperature pressure-sensitive adhesion of at least 200 grams per centimeter width; and (b) room-temperature-solid tackifying resin that provides increased room-temperature tackiness when added in at least some amounts to said acrylate resin or natural rubber, but which is included in said heat-activated adhesive in an amount sufficient to reduce room-temperature pressure-sensitive preadhesion of the adhesive to a value between 35 and 350 grams/centimeter, and which is less than the pressure-sensitive adhesion of the acrylate polymer prior to addition of the tackifying resin.
Claim 8
Dependent Claim
16 words
Adhesive of claim 5 in which isooctyl acrylate is a monomeric ingredient of the acrylate polymers.
Claim 9
Dependent Claim
19 words
Adhesive of claim 5 in which the tackifying resin comprises naturally occurring rosin or modified forms of such rosin.
Claim 10
Dependent Claim
13 words
Adhesive of claim 5, 6 or 7 which further includes a phenolic resin.
Claim 11
Dependent Claim
14 words
Sheet material carrying a layer of the heat-activated adhesive of claim 1 or 5.
Claim 12
Dependent Claim
14 words
Retroreflective sheeting carrying a layer of the heat-activated adhesive of claim 1 or 5.
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |