Patent ID: 7852559

Claim:
A diffusely reflecting polarizer comprising a layer containing a first polymer which is amorphous and having a birefringence of less than about 0.01, and a second polymer, the first polymer being a continuous phase, and the second polymer being a dispersed phase, wherein said first and second polymers taken together along a first axis for one polarization state of electromagnetic radiation exhibit a diffuse reflectivity R 1 d , a specular reflectivity R 1 s , a total reflectivity R 1 t , a diffuse transmittance T 1 d , a specular transmittance T 1 s , and a total transmittance T 1 t , and along a second axis for another polarization state of electromagnetic radiation exhibit a diffuse reflectivity R 2 d , a specular reflectivity R 2 s , a total reflectivity R 2 t , a diffuse transmittance T 2 d , a specular transmittance T 2 s , and a total transmittance T 2 t , the said first and second axes being orthogonal, wherein R 1 d is greater than R 1 s ; and T 2 t /(1−0.5( R 1 t+R 2 t ))>1.3.