Polymers for use in electronic devices
Disclosed is a polyimide having a repeat unit structure of Formula IV In Formula IV: R a is the same or different at each occurrence and represents one or more tetracarboxylic acid component residues; and R b is the same or different at each occurrence and represents one or more aromatic diamine residues. 30-100 mol % of R b has Formula II In Formula II: R 1 and R 2 are the same or different at each occurrence and are halogen, alkyl, fluoroalkyl, silyl, alkoxy, fluoroalkoxy, or siloxy; a and b are the same or different and are an integer from 0-4; c and d are the same or different and are 1 or 2; and * indicates a point of attachment.
1. A liquid medium in which a material is uniformly dissolved to form a solution, a liquid medium in which a material is uniformly dispersed to form a dispersion, or a liquid medium in which a material is uniformly suspended to form a suspension or an emulsion comprising
(a) a polyamic acid having a repeat unit structure of Formula I
where:
R a is the same or different at each occurrence and represents one or more tetracarboxylic acid component residues; and
R b is the same or different at each occurrence and represents one or more aromatic diamine residues;
wherein 30-100 mol % of R b has Formula II
where:
R 1 and R 2 are the same or different at each occurrence and are selected from the group consisting of fluoroalkyl, silyl, alkoxy, fluoroalkoxy, and siloxy;
a and b are the same or different and are an integer from 1-4;
c and d are the same or different and are 1 or 2; and
* indicates a point of attachment;
(b) a high-boiling aprotic solvent with a boiling point that is greater than 130° C.; and
(c) an imidization conversion catalyst.
2. The liquid medium of claim 1 , wherein 30-100 mol % of R b has a formula selected from the group consisting of Formula IIA, Formula IIB, Formula IIC, Formula IID, Formula IIE, and Formula IIF
3. The liquid medium of claim 1 , wherein 30-100 mol % of R b has a formula selected from the group consisting of Formula IIA-1, Formula IIB-1, Formula IIC-1, Formula IID-1, Formula IIE-1, and Formula IIF-1
where:
R 3 and R 4 are the same or different and are selected from the group consisting of fluoroalkyl, silyl, alkoxy, fluoroalkoxy, and siloxy.
4. A polyimide having a repeat unit structure of Formula IV
where
R a is the same or different at each occurrence and represents one or more tetracarboxylic acid component residues; and
R b is the same or different at each occurrence and represents one or more aromatic diamine residues;
wherein 30-100 mol % of R b has Formula II
where:
R 1 and R 2 are the same or different at each occurrence and are selected from the group consisting of fluoroalkyl, silyl, alkoxy, fluoroalkoxy, and siloxy;
a and b are the same or different and are an integer from 1-4;
c and d are the same or different and are 1 or 2; and
* indicates a point of attachment;
wherein the polyimide has a glass transition temperature (Tg) of greater than 250° C. an elongation to break of greater than 10% in accordance with ASTM Method D882, a linear coefficient of thermal expansion (CTE) of less than 20 ppm/° C. between 50° C. and 200° C., and an isothermal weight loss of less than 1% at 350° C. for 3 hours in nitrogen.
5. The polyimide of claim 4 , wherein 30-100 mol % of R b has a formula selected from the group consisting of Formula IIA, Formula IIB, Formula IIC, Formula IID, Formula IIE, and Formula IIF
6. The polyimide of claim 4 , wherein 30-100 mol % of R b has a formula selected from the group consisting of Formula IIA-1, Formula IIB-1, Formula IIC-1, Formula IID-1, Formula IIE-1, and Formula IIF-1
where:
R 3 and R 4 are the same or different and are selected from the group consisting of fluoroalkyl, silyl, alkoxy, fluoroalkoxy, and siloxy.
7. A polyimide film comprising the polyimide having the repeat unit structure of
Formula IV, according to claim 4 .
8. An organic electronic device having at least one layer comprising a polyimide film comprising the polyimide having the repeat unit structure of Formula IV, according to claim 4 .
9. The organic electronic device according to claim 8 , wherein the layer is used in device components selected from the group consisting of device substrates, substrates for color filter sheets, cover films, and touch screen panels.