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Polymeric-release-agents

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Polymeric release agents

Details

Inventors: Shah, Jaykumar Jivraj; Porsche, Jules Downes; Bartell, Charles;
Assignee: Borden, Inc. (Columbus, OH)
Primary Examiner: Robinson; Ellis
Assistant Examiner:
Attorney, Agent or Firm: Mast; Daniel D., Maskas; George P., Kap; George A.

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.

DETAILED DESCRIPTION We claim: 1.
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.
sub.
3, X is NH or O, Either R or R' must contain at least 12 carbon atoms.
2.
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.
sub.
3.
3.
The tape of claim 2 wherein the polymeric release agent is a reaction product of from about 90 to 95% the half amide type.
4.
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.
5.
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.
6.
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.
7.
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.
8.
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

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