초록

Gels for thermotropic layers, obtainable by irradiation of a mixture comprising a) an uncrosslinked polymer, b) monomers capable of free-radical polymerization and c) water or an organic solvent or mixtures thereof, with high-energy light.

대표청구항 ▼

A gel for thermotropic layers, obtained by irradiation of a mixture comprising a) 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

A gel for thermotropic layers, obtained by irradiation of a mixture comprising a) 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 and c) water or an organic solvent or mixtures thereof, with high-energy light.