Gels with thermotropic properties
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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Abstract
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.
74 Citations
7 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5)
- 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,
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6. A process for preparing gels with thermotropic properties, which comprises irradiating 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.
- 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,
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7. A gel for thermotropic layers, obtained by irradiation of a mixture comprising
a) an uncrosslinked polymer selected from the group consisting of polyvinyl ethers, poly-N-vinylcaprolactam and copolymers of N-vinylcaprolactam containing at least 20% by weight N-vinylcaprolactam, b) monomers capable of free-radical polymerization and c) water or an organic solvent or mixtures thereof, with high-energy light.
Specification