Thermostropic biphilic hydrogels and hydroplastics

Details Thermostropic biphilic hydrogels and hydroplastics Thermostropic biphilic hydrogels and hydroplastics

1990-11-29

1992-04-14

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263075, 524555, C08F21800, C08L 3900

Patent

active

051049546

ABSTRACT:
Novel hydrogels and hydroplastics are described which exhibit temperature dependent, reversible phase separations and clear-opaque transitions between 1.degree. and 100.degree. C. These materials consist of linear or crosslinked random copolymers of N,N-dimethylacrylamide with alkyl- and alkoxyalkyl acrylates. The water solubility and water swelling of these polymers is extremely temperature dependent; they show sharply defined clear to opaque transitions in their water swollen state and as soluble polymers shown Lower Critical Solution Temperatures (LCST). They are useful in drug delivery systems, absorption and extraction processes and as qualitative thermometers, thermosensors and self-activating sunscreens, for example in greenhouses.

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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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