| 摘要 |
Release agents for pressure-sensitive adhesive tapes comprise poly(amide acids), e.g., poly(N-fatty alkyl amide-acids) of the following recurring formula: <IMAGE> 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, R1 is hydrogen or an alkyl radical containing about 1 to 30 carbon atoms and R2 is an alkyl radical containing about 12 to 30 carbon atoms. When R1 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.
|
