US4029843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric release agents
Assignee: MYSTIK TAPE Corp AN IL CORP
•
Filing: 1976-01-15
•
Granted: 1977-06-14
•
Expires: 1996-01-15
Abstract
Abstract Improved high temperature and high humidity resistant release agents for pressure sensitive tapes are provided. Reaction products of (1) a polyanhydride resin and (2) water or an amine or an alcohol are applied as a thin coating to the tape to permit easy unwinding of the tape, even though it may have been stored at elevated temperature or humidity.
Inventors
- 👤 Jaykumar Jivraj Shah
- 👤 Jules Downes Porsche
- 👤 Charles Bartell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:34
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/21; C09J7/201; C09J7/22; C09J7/30; C09J7/38; C09J7/40; C09J7/401; C09J2301/00; C09J2301/30; C09J2301/302; C09J2467/00; C09J2467/005; C09J2477/00; C09J2477/005; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1476; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31786; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31888; Y10T428/31891; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31938
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
In a tape having a pressure sensitive adhesive on one surface of the base strip of the tape, the improvement consisting of a layer of a polymeric release agent on the opposite surface of said base strip, said polymeric release agent having the following structural formula: ##STR3## Wherein R is a straight chain alkyl group with 4 to 22 carbon atoms, R' is H or a straight chain alkyl group with 1 to 22 carbon atoms, R" is H or CH 3 , X is NH or O, Either R or R' must contain at least 12 carbon atoms.
Claim 2
Dependent Claim
99 words
In a tape having a pressure sensitive adhesive on one surface of the base strip of the tape, the improvement consisting of a layer of a polymeric release agent on the opposite surface of said base strip, said polymeric release agent having the following structural formula: ##STR3## Wherein R is a straight chain alkyl group with 4 to 22 carbon atoms, R' is H or a straight chain alkyl group with 1 to 22 carbon atoms, R" is H or CH 3 , X is NH or O, Either R or R' must contain at least 12 carbon atoms.
Claim 3
Dependent Claim
80 words
The tape of claim 1 wherein the polymeric release agent is a reaction product of a copolymer of an alpha olefin and an unsaturated aliphatic dicarboxylic acid anhydride with an amine to form a majority of the half amide type as follows: ##STR4## Wherein R is a straight chain alkyl group having 4 to 22 carbon atoms, R' is H or a saturated straight chain alkyl group having 1 to 22 carbon atoms, R" is H or CH 3 .
Claim 4
Dependent Claim
24 words
The tape of claim 2 wherein the polymeric release agent is a reaction product of from about 90 to 95% the half amide type.
Claim 5
Dependent Claim
36 words
The tape of claim 1 wherein the polymeric release agent is a reaction product of (1) a copolymer formed by reacting an olefin with a dicarboxylic anhydride and (2) water to form the corresponding dicarboxylic acid.
Claim 6
Dependent Claim
38 words
The tape of claim 1 wherein the polymeric release agent is a reaction product of (1) a copolymer formed by reacting an olefin with a dicarboxylic anhydride and (2) an alcohol to form the corresponding monocarboxylic half ester.
Claim 7
Dependent Claim
38 words
The tape of claim 1 wherein the polymeric release agent is a reaction product of (1) a copolymer formed by reacting an olefin with a dicarboxylic anhydride and (2) an amine to form the corresponding half amide derivative.
Claim 8
Dependent Claim
25 words
The tape of claim 5 wherein the olefin is n-hexene-1 and the alcohol contains a straight chain alkyl group having 12 to 22 carbon atoms.
Claim 9
Dependent Claim
25 words
The tape of claim 6 wherein the olefin is n-hexene-1 and the amine contains a straight chain alkyl group having 12 to 22 carbon atoms.
Claim 10
Dependent Claim
84 words
A release liner comprising a backing sheet and on at least one surface of said sheet a layer of polymeric release agent, said polymeric release agent having the following structural formula: ##STR5## Wherein R is a straight chain alkyl group with 4 to 22 carbon atoms, R' is H or a straight chain alkyl group with 1 to 22 carbon atoms; R" is H or CH 3 , X is NH or O, Either R or R' must contain at least 12 carbon atoms.
Claim 11
Dependent Claim
84 words
A release liner comprising a backing sheet and on at least one surface of said sheet a layer of polymeric release agent, said polymeric release agent having the following structural formula: ##STR5## Wherein R is a straight chain alkyl group with 4 to 22 carbon atoms, R' is H or a straight chain alkyl group with 1 to 22 carbon atoms; R" is H or CH 3 , X is NH or O, Either R or R' must contain at least 12 carbon atoms.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |