US4022732A
Expired / Lapsed
US
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Poly(amide acids) release agents for pressure-sensitive adhesive tapes
Assignee: Nashua Corp
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Filing: 1975-08-25
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Granted: 1977-05-10
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Expires: 1995-08-25
Abstract
Abstract Release agents for pressure-sensitive adhesive tapes comprise poly(amide acids), e.g., poly(N-fatty alkyl amide-acids) of the following recurring formula: ##STR1## wherein A is a divalent organic radical containing from 2 to 15, preferably 2 to 6, carbon atoms, R is a tetravalent organic radical containing at least 4 carbon atoms, R 1 is hydrogen or an alkyl radical containing about 1 to 30 carbon atoms and R 2 is an alkyl radical containing about 12 to 30 carbon atoms. When R 1 is hydrogen, also provided are the corresponding cyclized imide products and mixtures of the polyamides and polyimides. These poly(amide acids) are formed by the reaction of tetracarboxylic acid dianhydrides and fatty diamines.
Inventors
- 👤 Andor Schwarcz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:54
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
A polymeric composition suitable as a release agent for pressure-sensitive adhesives comprising the reaction product of a tetracarboxylic dianhydride and an N-fatty diamine having the general recurring formulae: ##STR8## III. mixtures thereof wherein R is a tetravalent radical having at least 4 carbon atoms, and wherein in the dianhydride the four carbonyl groups are attached to separate carbon atoms and each pair of carbonyl groups is directly attached to adjacent nuclear carbon atoms, A is a divalent organic radical having from 2 to 15 carbon atoms, the amino groups in the diamine component being attached to separate carbon atoms, R 1 is an alkyl radical having a straight chain containing about 1 to 30 carbon atoms or hydrogen and R 2 is an alkyl radical having a straight chain containing about 12 to 30 carbon atoms, the polymer having an intrinsic viscosity of more than about 0.04 up to 0.07 as measured in tetrahydrofuran at 30° C.
Claim 2
Dependent Claim
157 words
A polymeric composition suitable as a release agent for pressure-sensitive adhesives comprising the reaction product of a tetracarboxylic dianhydride and an N-fatty diamine having the general recurring formulae: ##STR8## III. mixtures thereof wherein R is a tetravalent radical having at least 4 carbon atoms, and wherein in the dianhydride the four carbonyl groups are attached to separate carbon atoms and each pair of carbonyl groups is directly attached to adjacent nuclear carbon atoms, A is a divalent organic radical having from 2 to 15 carbon atoms, the amino groups in the diamine component being attached to separate carbon atoms, R 1 is an alkyl radical having a straight chain containing about 1 to 30 carbon atoms or hydrogen and R 2 is an alkyl radical having a straight chain containing about 12 to 30 carbon atoms, the polymer having an intrinsic viscosity of more than about 0.04 up to 0.07 as measured in tetrahydrofuran at 30° C.
Claim 3
Dependent Claim
34 words
A composition according to claim 1 wherein R is an organic tetravalent radical containing 4-20 carbon atoms and is selected from the group consisting of aromatic, aliphatic, and combinations of aromatic and aliphatic, radicals.
Claim 4
Dependent Claim
26 words
A composition according to claim 2 wherein A is selected from the group consisting of aromatic and aliphatic radicals and combinations of aromatic and aliphatic radicals.
Claim 5
Dependent Claim
26 words
A composition according to claim 1 of the following recurring formula: ##STR9## wherein A, R, R 1 and R 2 are defined as in claim 1.
Claim 6
Dependent Claim
26 words
A composition according to claim 1 of the following recurring formula: ##STR10## wherein A, R, R 1 and R 2 are defined as in claim 1.
Claim 7
Dependent Claim
13 words
A composition according to claim 1 comprising mixtures of formulae I and II.
Claim 8
Dependent Claim
26 words
A composition according to claim 2 wherein R is a tetravalent radical selected from the group consisting of naphthyl, diphenyl, diphenyl sulfonyl, pyrrolidyl, and diphenyl ether.
Claim 9
Dependent Claim
20 words
A composition according to claim 6 wherein A is a divalent aliphatic hydrocarbon radical having 2 to about 6 atoms.
Claim 10
Dependent Claim
34 words
A composition according to claim 8 wherein R 1 is an alkyl radical containing about 1 to 30 carbon atoms and R 2 is an alkyl radical containing about 12 to 30 carbon atoms.
Claim 11
Dependent Claim
25 words
A composition according to claim 8 wherein R 1 is hydrogen and R 2 is an alkyl radical containing about 12 to 30 carbon atoms.
Claim 12
Dependent Claim
24 words
A composition according to claim 7 wherein the organic tetravalent radical is the diphenyl radical of 3, 3', 4, 4', - benzophenone tetracarboxylic dianhydride.
Claim 13
Dependent Claim
28 words
A composition according to claim 10 wherein the divalent aliphatic hydrocarbon radical is the radical of N-behenyl trimethylene diamine, and the intrinsic viscosity of the polymer is 0.067.
Claim 14
Dependent Claim
113 words
Release composition comprising as a minor component a polymeric composition of the general recurring formulae ##STR11## III. mixtures thereof wherein A is a divalent organic radical having from 2 to 15 carbon atoms, R is a tetravalent radical having at least 4 carbon atoms, R 1 is an alkyl radical containing about 1 to 30 carbon atoms or hydrogen, and R 2 is an alkyl radical containing about 12 to 30 carbon atoms, the polymeric materials having an intrinsic viscosity of more than about 0.04 as measured in tetrahydrofuran at 30° C, and as a major component a latex blend containing a major amount of polyvinylchloride and a minor amount of nitrile rubber.
Claim 15
Dependent Claim
113 words
Release composition comprising as a minor component a polymeric composition of the general recurring formulae ##STR11## III. mixtures thereof wherein A is a divalent organic radical having from 2 to 15 carbon atoms, R is a tetravalent radical having at least 4 carbon atoms, R 1 is an alkyl radical containing about 1 to 30 carbon atoms or hydrogen, and R 2 is an alkyl radical containing about 12 to 30 carbon atoms, the polymeric materials having an intrinsic viscosity of more than about 0.04 as measured in tetrahydrofuran at 30° C, and as a major component a latex blend containing a major amount of polyvinylchloride and a minor amount of nitrile rubber.
Claim 16
Dependent Claim
17 words
Release composition comprising as a minor component an amine salt of the polymeric composition of claim 8.
References Cited (Backward Citations)
US2421024A
Cited
US3303157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |