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Shaped plastic articles having replicated microstructure surfaces

  • US 4,576,850 A
  • Filed: 07/20/1978
  • Issued: 03/18/1986
  • Est. Priority Date: 07/20/1978
  • Status: Expired due to Term
First Claim
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1. An article, useful for an optical purpose, comprising a shaped, plastic, optically homogeneous, cast, monolithic layer having a replicated microstructure-bearing surface whose configuration contains a plurality of utilitarian discontinuities which characterize said optical purpose of said article, said layer comprising crosslinked polymer composed of (1) a plurality of hard segments of mono- or polyvalent moieties containing one or more carbocyclic and/or heterocyclic groups, wherein each of said moieties of said hard segments, when their valences are satisfied by protons, has at least one major transition temperature above 250°

  • K., and (2) a plurality of soft segments of mono- or polyvalent moieties, wherein each of said moieties of said soft segments has a number average molecular weight of about 500 to 5000 and homopolymers thereof have a glass transition temperature below 250°

    K.

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