US3970599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release agents suitable for use with pressure-sensitive adhesive tapes
Assignee: Nashua Corp
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Filing: 1974-07-01
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Granted: 1976-07-20
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Expires: 1994-07-01
Abstract
Abstract Release agents are provided which comprise the polymeric reaction product of a fatty diamine with a diisocyanate and, optionally, a diol. These polyurea and polycarbamate products have the following recurring formula: ##EQU1## WHEREIN A is an alkylene radical containing about 2 to 6 carbon atoms, B is an arylene radical containing about 6 to 16 carbon atoms, D is an aliphatic organic radical containing about 2 to 6 carbon atoms, R is an alkyl radical containing about 12 to 25 carbon atoms, R' is hydrogen or an alkyl radical containing about 1 to 25 carbon atoms, a and b represent the number of recurring units and the ratio of b/a varies from 0 to 2, and c is 0, 1 or 2. Also provided are pressure sensitive adhesive tapes and release liners utilizing these novel release agents.
Inventors
- 👤 Andor Schwarcz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/348; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0823; C08G18/32; C08G18/3225; C09; C09J; C09J7/00; C09J7/40; C09J7/401; C09J2475/00; C09J2475/005; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31591
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
A release liner comprising a backing member and on at least one side thereof a polymeric composition having the general recurring formula: ##EQU6## wherein A is an alkylene radical containing about 2 to 6 carbon atoms, B is an arylene radical containing about 6 to 16 carbon atoms, D is an aliphatic organic radical containing about 2 to 6 carbon atoms, R is an alkyl radical containing about 12 to 25 carbon atoms, R' is hydrogen or an alkyl radical containing about 1 to 25 carbon atoms, a and b represent the number of recurring units and the ratio of b/a varies from 0 to 2, and c is 0, 1 or 2.
Claim 2
Dependent Claim
113 words
A release liner comprising a backing member and on at least one side thereof a polymeric composition having the general recurring formula: ##EQU6## wherein A is an alkylene radical containing about 2 to 6 carbon atoms, B is an arylene radical containing about 6 to 16 carbon atoms, D is an aliphatic organic radical containing about 2 to 6 carbon atoms, R is an alkyl radical containing about 12 to 25 carbon atoms, R' is hydrogen or an alkyl radical containing about 1 to 25 carbon atoms, a and b represent the number of recurring units and the ratio of b/a varies from 0 to 2, and c is 0, 1 or 2.
Claim 3
Dependent Claim
51 words
The release liner according to claim 1 wherein A is ethylene, propylene, butylene, isobutylene, pentylene, or hexylene, B is phenylene, tolylene, naphtylene, biphenylene or alkyl substituted derivatives thereof wherein the alkyl group has one to five carbon atoms and D is an aliphatic organic radical containing two to six carbon atoms.
Claim 4
Dependent Claim
11 words
The release liner according to claim 2 wherein B is tolylene.
Claim 5
Dependent Claim
14 words
The release liner according to claim 3 wherein the ratio of b/a is 0.
Claim 6
Dependent Claim
18 words
The release liner according to claim 3 wherein the ratio of b/a is 1 and c is 1.
Claim 7
Dependent Claim
11 words
The release liner according to claim 2 wherein R' is hydrogen.
Claim 8
Dependent Claim
13 words
The release liner according to claim 6 wherein R is biphenyl or stearyl.
Claim 9
Dependent Claim
27 words
The release liner according to claim 2 wherein A is propylene, B is tolylene, R is biphenyl, R' is hydrogen, and c is 0, 1 or 2.
Claim 10
Dependent Claim
11 words
The release liner according to claim 8 wherein c is 1.
Claim 11
Dependent Claim
11 words
The release liner according to claim 8 wherein c is 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |