Multi-coat polymer photonic crystal films
AssigneeColorado State University Research Foundation
InventorsRyan Michael Pearson, Matthew David Ryan, Garret Miyake
Life of this patent
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Abstract
Polymer composite photonic crystal materials are disclosed as coatings and topcoats which have high reflection (>30%) in a specific range of the electromagnetic spectrum, such as ultraviolet (<400 nm), visible (Vis, 400 nm-700 nm), or near-infrared radiation range (NIR, 700-2000 nm), and relatively low reflection (<20% reflection) in a second, different range of the electromagnetic spectrum. Surprisingly, it was found that through a formulation and additives approach, the optical properties of polymer composite photonic crystal films can be selectively modified from a variety of different coating methods, including spray deposition.
Claims19
A multilayer coating comprising:
- a) a first layer of a photonic crystal film comprising a pigment and brush block copolymer (BBCP) of Formula IA or Formula IB:
- wherein
- Rx is —(C2-C6)alkyl-OC(═O)G1 wherein G1 comprises polyacrylate, polymethacrylate or polylactic acid;
- Ry is —(C1-C8)alkyl-G2-G3 wherein G2 is —C(═O)O— or a nitrogen heterocycle and G3 comprises polystyrene, polyacrylate, polydimethylsiloxane, polyether, polymethacrylate, or polylactic acid;
- R1 is unbranched alkyl;
- R2 is branched alkyl;
- J1 and G are each independently CH2 or C═O;
- each J2 is independently CH2 or C═O;
- each Q is independently alkyl, cycloalkyl, heterocycloalkyl, aryl, or heteroaryl;
- a and b are each independently 0 to about 1000;
- and
- x and y are each independently 1 to about 1000;
- wherein blocks a, b, x and y are in any order, the ratio of x:a is 1:0 to about 1:3, and the ratio of y:b is 1:0 to about 1:3;
- and
- b) a second layer comprising a topcoat wherein the topcoat is an optical adhesive or ultraviolet curable resin;
- wherein the first layer and second layer form a multilayer film and the multilayer coating comprises one or more multilayer films.
A method for forming a multilayer coating comprising:
- a) combining a solvent, a pigment and a brush block copolymer (BBCP) to form a mixture, wherein the BBCP is a BBCP of Formula IC:
- wherein
- Rx is —(C2-C6)alkyl-OC(═O)G1 wherein G1 comprises polyacrylate, polymethacrylate or polylactic acid;
- Ry is —(C1-C8)alkyl-G2-G3 wherein G2 is —C(═O)O— or a nitrogen heterocycle, and G3 comprises polystyrene, polyacrylate, polydimethylsiloxane, polyether, polymethacrylate, or polylactic acid;
- R1 is unbranched alkyl;
- R2 is branched alkyl;
- a and b are each independently 0 to about 1000;
- and
- x and y are each independently 1 to about 1000;
- wherein the ratio of x:a is 1:0 to about 1:3 and the ratio of y:b is 1:0 to about 1:3;
- b) applying a first layer of the mixture to a substrate;
- c) drying the first layer to form a film;
- and
- d) applying a second layer comprising a topcoat to the film wherein the topcoat is an optical adhesive or ultraviolet curable resin;
- wherein the film and the second layer form the multilayer coating on the substrate.
Dependencies are inferred from the claim text.