Poly(amide acids) release agents for pressure-sensitive adhesive

Details Poly(amide acids) release agents for pressure-sensitive adhesive Poly(amide acids) release agents for pressure-sensitive adhesive

1975-08-25

1977-05-10

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 47CP, 260 49, 260 65, 260 78TF, 260857UN, C08G 7310

Patent

active

040227324

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.sub.1 is hydrogen or an alkyl radical containing about 1 to 30 carbon atoms and R.sub.2 is an alkyl radical containing about 12 to 30 carbon atoms. When R.sub.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.

REFERENCES:
patent: 2421024 (1947-05-01), Frusch
patent: 3303157 (1967-02-01), Boldebuck et al.

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