US 12,117,636 B2 · Optical film and glass laminate

Abstract

An optical film includes a plurality of alternating first and second layers. The first layers have a first in-plane birefringence, the second layers have a second in-plane birefringence, and the second in-plane birefringence is less than the first in-plane birefringence and greater than 0.03. The first layers may include polyethylene terephthalate homopolymer and the second layers may include glycol-modified co(polyethylene terephthalate). The optical film has a shrinkage along a first direction of greater than 4% and a shrinkage along an orthogonal second direction of greater than 3% when heated at 150° C. for 15 minutes. A glass laminate is prepared by disposing the optical film between glass layers and laminating the optical film to the glass layers.

Claims7

Dependent claims

An optical film comprising:

a plurality of alternating first and second layers, the first layers having a first in-plane birefringence being a difference in refractive index of the first layers along a first in-plane direction and a refractive index of the first layers along an orthogonal second in-plane direction, the second layers having a second in-plane birefringence being a difference in refractive indices of the second layers along the first in-plane direction and along the second in-plane direction, the second in-plane birefringence being less than the first in-plane birefringence and greater than 0.03, wherein the optical film has a shrinkage along the first in-plane direction of greater than 4% and a shrinkage along the second in-plane direction of greater than 3% when heated at 150° C. for 15 minutes.

Dependencies are inferred from the claim text.

Optical film and glass laminate

Life of this patent

Optical film and glass laminate

Life of this patent

Abstract

Claims7