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Gels with thermotropic properties

  • US 5,587,404 A
  • Filed: 04/18/1995
  • Issued: 12/24/1996
  • Est. Priority Date: 04/22/1994
  • Status: Expired due to Term
First Claim
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1. A gel for thermotropic layers, obtained by irradiation of a mixture comprisinga) an uncrosslinked polymer selected from the group consisting of poly-N-vinylcaprolactam, copolymers of N-vinylcaprolactam containing at least 20% by weight of N-vinylcaprolactam and polyvinyl ethers, said uncrosslinked polymer having thermotropic properties such that a 10% by weight solution of this polymer in water or an organic solvent or mixtures thereof brings about, in a switching range covering less than 20°

  • C., a change in the transmission of light at a wavelength of 600 nm and at a path length of 10 mm such that less than 50% of the incident light is transmitted at temperatures above the switching range and at least 70% of the incident light is transmitted below the switching range,b) monomers capable of free-radical polymerization andc) water or an organic solvent or mixtures thereof, with high-energy light.

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