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Post-forming continuous/disperse phase optical bodies

  • US 6,256,146 B1
  • Filed: 07/31/1998
  • Issued: 07/03/2001
  • Est. Priority Date: 07/31/1998
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a diffusely reflective article, said method comprising:

  • providing an optical body having a generally sheet-like configuration, said optical body comprising;

    a first phase having a birefringence of at least about 0.05; and

    a second phase, disposed within said first phase, whose index of refraction differs from said first phase by greater than about 0.05 along a first axis and by less than about 0.05 along a second axis orthogonal to said first axis;

    wherein diffuse reflectivity of said first and second phases taken together along at least one axis for at least one polarization of electromagnetic radiation is at least about 30%;

    post-forming said optical body into a diffusely reflective article, wherein a selected area of said optical body undergoes permanent deformation, and further wherein said selected area of said optical body comprises only a portion of said optical body.

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