Polymers for use in electronic devices
Disclosed is a polyimide having a repeat unit structure of Formula III In Formula III: R a represents one or more different tetracarboxylic acid component residues; and R b represents one or more different aromatic diamine residues or aromatic diisocyanate residues. 5-100 mol % of R a has Formula II In Formula II: R 1 is H, halogen, cyano, hydroxyl, alkyl, heteroalkyl, alkoxy, heteroalkoxy, fluoroalkyl, silyl, hydrocarbon aryl, substituted hydrocarbon aryl, heteroaryl, substituted heteroaryl, ally, or vinyl; R 2 is halogen, cyano, hydroxyl, alkyl, heteroalkyl, alkoxy, heteroalkoxy, fluoroalkyl, silyl, hydrocarbon aryl, substituted hydrocarbon aryl, heteroaryl, substituted heteroaryl, ally, or vinyl; R 3 and R 4 are the same or different and are alkyl, fluoroalkyl, or silyl; x and y are the same or different and are an integer from 0-2; and * indicates a point of attachment.
1. A liquid composition comprising
(a) a polyamic acid having a repeat unit structure of Formula I
where:
R a represents one or more different tetracarboxylic acid component residues; and
R b represents one or more different aromatic diamine residues or aromatic diisocyanate residues;
wherein 5-100 mol % of R a has Formula II
where:
R 1 and R 2 are joined together to form an unsubstituted or substituted cyclic group selected from the group consisting of a hydrocarbon aryl group and a heteroaryl group;
R 3 and R 4 are the same or different and are selected from the group consisting of alkyl, fluoroalkyl, and silyl;
x and y are the same or different and are an integer from 0-2; and
* indicates a point of attachment; and
(b) at least one high-boiling aprotic solvent.
2. The liquid composition according to claim 1 , wherein 40-60 mol % of R a has Formula II.