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US 5,310,851 AGranted
Spin-labelled thickeners
AssigneeRohm and Haas Company
InventorWillie Lau
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Abstract
A hydrophobically-modified thickener having at least one hydrophilic portion and at least two terminal hydrophobic portions wherein at least one of the hydrophobic portions contains a stable free radical and its preparation are disclosed. The presence of the stable free radical permits analysis by spin-labelling analytical techniques, such as, for example, electron spin resonance.
Claims6
A hydrophobically-modified thickener comprising a polymer comprising:
- (a) at least one hydrophilic portion;
- and
- (b) at least two terminal hydrophobic portions, wherein at least one terminal hydrophobic portion comprises a covalently bonded stable free radical
- wherein said polymer is the reaction product of:
- (i) at least one water-soluble polyether polyol;
- (ii) at least one water-insoluble organic polyisocyanate;
- and
- (iii) at least one hydrophobic monofunctional active hydrogen compound containing a covalently-bonded stable free radical.
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A method of spin labelling a hydrophobically-modified thickener comprising reacting:
- (a) at least one water-soluble polyether polyol;
- (b) at least one water-insoluble organic polyisocyanate;
- and
- (c) at least one hydrophobic monofunctional active hydrogen compound containing a covalently-bonded stable free radical.
1 more element
Dependencies are inferred from the claim text.