Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-08-12
1998-12-01
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524533, 524556, 524558, C08F 814
Patent
active
058440399
ABSTRACT:
Polymers comprising reversible hydrophobic functionalities are disclosed. The preferred embodiment polymers comprise Lewis acid segments and Lewis base segments. The polymer segments are, by themselves, hydrophilic and will either swell or dissolve in water. When the segments are incorporated into a polymer according to the present invention, the segments form water-insoluble or hydrophobic complexes. Upon changes in pH, temperature or solvent type, these complexes may dissociate, giving large transitions in polymer viscosity, emulsification ability, mechanical strength or transport properties. These polymers are useful as reversible emulsifiers which form stable emulsions at acidic pH and unstable emulsions at basic pH, as water-borne thickeners having low viscosity at low pH and high viscosity at high pH, as superabsorbing resins, or as coatings for pharmaceutical or agricultural agents.
REFERENCES:
patent: 4771105 (1988-09-01), Shirai et al.
patent: 5336728 (1994-08-01), Humphries et al.
patent: 5422394 (1995-06-01), Taylor et al.
Klier John
Mathur Arvind M.
Scranton Alec B.
Lipman Bernard
Michigan State University
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