Recording films with a high refractive index modulation
AssigneeE. I. Du Pont de Nemours and Company
InventorsAndrew M. Weber, Aleksander Beresniewicz
Life of this patent
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Abstract
Holographic films contain a copolymer binder having the following formula: (M).sub.w (VAc).sub.x (VOH).sub.y (CTFE).sub.z wherein M is a fluoromonomer; VAc is vinyl acetate; VOH is vinyl alcohol; and CTFE is chlorotrifluoroethylene; and wherein w, x, y, and z are percentages by weight; w is 5 to 22%, x is 50 to 75%, y is 3 to 8%, and z is 15 to 30% with the copolymer containing 3-35% by weight fluorine. These imaged films are particularly suited for lamination to glass in head-up display applications.
Claims13
In a photopolymerizable film composition containing a binder, a monomer, and a photoinitiator, for use in the preparation of refractive index images, the improvement wherein said binder is a copolymer comprising the formula:
- (M).sub.w (VAc).sub.x (VOH).sub.y (CTFE).sub.z
- wherein M is a fluoromonomer, VAc is vinyl acetate, VOH is vinyl alcohol and CTFE is a chlorofluoromonomer;
- w, x, y and z are weight percents and w is 5 to 22%, x is 50 to 75%, y is 3 to 8%, and z is 15 to 30%;
- with the proviso that said copolymer contains about 3 to 35% fluorine by weight;
- and
- wherein said film composition comprises by weight, 25 to 90% binder, 5 to 60% monomer, and 0.1 to 10% photoinitiator system.
A laminated structure comprising, in order:
- (a) a first ply;
- (b) a photopolymerizable film imaged to contain a refractive index image, said film comprising, by weight, 25 to 90% binder, 5 to 60% monomer, and 0.1 to 10% photoinitiator system, said binder comprising a copolymer having the formula
- (M).sub.w (VAc).sub.x (VOH).sub.y (CTFE).sub.z
- wherein M is a fluoromonomer, VAc is vinyl acetate, VOH is vinyl alcohol, CTFE is a chlorofluoromonomer;
- w, x, y, and z are weight percents and w is 5 to 22%, x is 50 to 75%, y is 3 to 8%, and z is 15 to 30%;
- with the proviso that said copolymer contains about 3 to 35% fluorine by weight;
- (c) and a second ply.
Dependencies are inferred from the claim text.