Thermotropic copolymer hydrogels from N,N-dimethylacrylamide and

Details Thermotropic copolymer hydrogels from N,N-dimethylacrylamide and Thermotropic copolymer hydrogels from N,N-dimethylacrylamide and

1990-05-21

1991-10-15

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 58, 524521, 524555, 5263075, 5263077, C08L 8900, C08F21802

Patent

active

050575600

ABSTRACT:
Novel thermotropic hydrogel forming polymers are described, which are ramdom copolymers of N,N-dimethyacrylamide with methoxy-ethyl acrylate or methacrylate. The linear polymers exhibit in water a lower-critical-solution-temperature (LCST) between 0.degree. and 70.degree. C. The water swelling of the crosslinked polymers is extremely temperature dependent and the gels show sharply defined clear to opaque transitions. The novel polymers are useful in drug delivery systems, absorption and extraction processes and as qualitative thermometers, thermosensors and self-activating sunscreens, for example for greenhouses.

REFERENCES:
patent: 4388436 (1983-06-01), Chen
patent: 4548990 (1985-10-01), Mueller et al.
patent: 4625009 (1986-11-01), Izumitani et al.

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