DIELECTRIC POLYMER MATERIALS WITH COLORATION AND DEVICES USING THEM
The present disclosure relates generally to colored dielectric polymer materials, methods of making them and uses thereof. In particular, the application concerns a colored dielectric polymer material comprising a crosslinked polymer and a dye dispersed in the crosslinked polymer.
1 . A colored dielectric polymer material comprising a crosslinked polymer and a dye dispersed in the crosslinked polymer, wherein the crosslinked polymer comprises a crosslinking product of crosslinkable composition including a first polymer having bis(phenylene)sulfone residues and/or bisphenol A residues.
2 . The colored dielectric polymer material according to claim 1 , wherein the first polymer has a concentration of bis(phenylene)sulfone residues of at least 5 wt %.
3 . The colored dielectric polymer material according to claim 2 , wherein the first polymer has a weight-average molecular weight (M w ) ranging from about 1,000 g/mol to about 200,000 g/mol.
4 . The colored dielectric polymer material according to claim 2 , wherein the first polymer has repeating units of structural formula
wherein
z is 0 or 1;
each W 1 is independently —Ar[—Y—Ar] q —, wherein:
Ar, at each occurrence, is independently a divalent C 6-18 arylene group;
Y, at each occurrence, is independently selected from the group consisting of —O—, —S—, —(CR 1 R 2 ) r —, —NR 3 —, —C(O)—, and a covalent bond, wherein R 1 and R 2 , at each occurrence, independently is selected from the group consisting of H, a halogen, CN, a C 1-10 alkyl group, and a C 1-10 haloalkyl group; each R 3 is selected from the group consisting of H, a C 1-10 alkyl group, and a C 1-10 haloalkyl group and each r is selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10;
q is selected from the group consisting of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10; and
each Z 1 and Z 2 is independently selected from the group consisting of —O—, —S—, —Se—;
—C(O)O—, —OC(O)—, NR 4 —C(O)—, —C(O)—NR 4 —, O—(CHR 5 CHR 5 —O) a —, —OCH 2 CH(OH)CH 2 —O—, and —O—CHR 5 CHR 5 —Si(R 6 ) 2 —CHR 5 CHR 5 —O—, wherein a is 1-5 and each R 4 , R 5 , and R 6 is independently H or methyl; or
when z is 0, Z 1 is
wherein the first polymer has a weight-average molecular weight (M w ) ranging from about 1,000 to about 200,000.
5 . The colored dielectric polymer according to claim 1 , wherein the first polymer includes a repeating unit selected from
6 . The colored dielectric polymer material according to claim 1 , wherein the first polymer has a concentration of bisphenol A residues of at least 5 wt %.
7 . The colored dielectric polymer according to claim 1 , wherein the first polymer includes a repeating unit selected from
8 . The colored dielectric polymer material according to claim 7 , wherein the first polymer has a concentration of bis(phenylene)sulfone residues of at least 5 wt %, and a concentration of bisphenol A residues of at least 5 wt %.
9 . The colored dielectric polymer according to claim 1 , wherein the first polymer includes a repeating unit selected from
10 . The colored dielectric polymer material according to claim 1 , wherein the crosslinkable composition includes a polyfunctional crosslinker selected from polyfunctional (meth)acrylates, polyfunctional maleimides and polyfunctional epoxides.
11 . The colored dielectric polymer material according to claim 1 , wherein the crosslinkable composition includes a photoinitiator.
12 . The colored dielectric polymer material according to claim 1 , wherein the crosslinked polymer has a dielectric constant in the range of 2 to 8 at 1 MHz.
13 . The colored dielectric polymer material of claim 1 , wherein the dye comprises one or more dyes selected from perylene diimide dyes, naphthalene diimide dyes, naphthalene monoimide dyes, perylene dyes, anthraquinone dyes, quinone dyes, phenazine dyes, azo dyes, triarylmethane dyes, transition metal coordination complex dyes, cyanine dyes, phenoxazine dyes, indole dyes, xanthene dyes, coumarin dyes, nitro dyes, indene dyes, porphyrin dyes, phthalocyanine dyes, and metal complex dyes.
14 . The colored dielectric polymer material of claim 1 , wherein the dye comprises an ionic dye, for example, wherein the ionic dye is Dye 757, Dye-6G, or Dye Bu26.
15 . The colored dielectric polymer material of claim 1 , wherein the dye is present in the colored dielectric polymer material in an amount of at least 1 wt %.
16 . The colored dielectric polymer material of claim 1 , wherein the material is provided as a body having a transmittance maximum of at least 50% at one or more wavelengths in the range of 380-450 nm (violet); 450-495 nm (blue); 495-570 nm (green); 570-590 nm (yellow); 590-620 nm (orange); or 620-750 nm (red).
17 . The colored dielectric polymer material of claim 16 , wherein the body has a transmittance minimum of no more than 20% at one or more wavelengths in the range of 380-450 nm (violet); 450-495 nm (blue); 495-570 nm (green); 570-590 nm (yellow); 590-620 nm (orange); or 620-750 nm (red).
18 . The colored dielectric polymer material of claim 1 , wherein the dye has a molar absorptivity of at least 8,000 M −1 cm −1 at least one wavelength within the 380-750 nm wavelength range.
19 . The colored dielectric polymer material of claim 1 , wherein the colored dielectric polymer material has a dielectric strength (breakdown field) no less than 1 MV/cm.
20 . The colored dielectric polymer material of claim 1 , in the form of a film having a thickness of no more than 4 μm.
21 . A device comprising a film of the colored dielectric polymer material of claim 1 .
22 . The device of claim 21 , wherein the maximum transmittance of the colored dielectric polymer material after sputtering and annealing is within 20% of the maximum transmittance prior to sputtering and annealing.
23 . The device of claim 21 , in the form of a liquid crystal cell, the liquid crystal cell comprising:
a first cell plate having a top surface, the first cell plate comprising a first transparent substrate,
disposed on the first transparent substrate, the colored dielectric polymer material; and
disposed on the colored dielectric polymer material, a first transparent conducting oxide film, the transparent conducing oxide being within 100 nm of the top surface of the first cell plate;
a second cell plate having a top surface, the second cell plate comprising
a second transparent substrate,
disposed on the second transparent substrate, a second transparent conducting oxide film, the transparent conducing oxide being within 100 nm of the top surface of the second cell plate;
one or more spacers disposed between the top surface of the first cell plate and the top surface of the second cell plate, the one or more spacers defining lateral edges of the liquid crystal cell; and
a liquid crystal material disposed in a volume defined by the top surface of the first cell plate, the top surface of the second cell plate, and the one or more spacers.