Patent ID: 8663794

Claim:
A nanocomposite film comprising nanoparticles dispersed in a polymer matrix comprising at least one polymer, wherein the nanoparticles have been generated in situ in the polymer matrix, and wherein said film simultaneously satisfies the following three conditions: |Δ n th (λ 2 )|−|Δ n th (λ 1 )|>0 for 400 nm<λ 1 <λ 2 <650 nm (i) | n x −n y |<0.0001 (ii) Δ n th (450 nm)/Δ n th (550 nm)<0.98, (iii) wherein the polymer is characterized by negative intrinsic birefringence and is selected from the group consisting of vinyl carbazole or styrene, and copolymers thereof and the nanoparticles include titanium oxide nanoparticles.