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US 4,496,708 AGranted
Water-soluble polyurethane comb polymer production
AssigneeUnion Carbide Corporation
InventorsDavid C. Dehm, Kenneth L. Hoy, Richard C. Hoy
Life of this patent
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Abstract
Water soluble polyurethanes, having hydrophilic polyether backbone and pendant monovalent hydrophobic groups of sufficient size and number while establishing proper hydrophilic/lipophilic balance, provide improved thickening of aqueous systems.
Claims24
A comb polymer comprising a water-soluble polyurethane containing the repeating units:
- --X.sub.a' --, --Y.sub.b -- and --(--X--).sub.m --Z.sub.c --
- wherein:
- X is the residue of an organic polyisocyanate;
- Y is the residue of a polyethylene glycol homopolymer or copolymer with up to 50 mole percent C.sub.3 to C.sub.5 polyoxyalkylene, or the monomeric equivalent of said polyethylene glycol;
- Z is the residue of a hydrophobe reactant containing a monovalent hydrophobic group providing a molar volume contribution of at least about 130 cc/mole;
- b is at least about 2;
- c is at least about 2;
- m is 0 or 1;
- a' is such that ##EQU5## is between about 0.50 to about 1.25 and sufficient to provide a polymer molecular weight of at least about 10,000;
- and wherein:
- (1) the polymer has at least one Z unit separated from each end of the polymer by at least one X unit;
- and
- (2) the hydrophilic/lipophilic balance of the polymer is between about 14 to about 19.5.
10 more elements
A process for producing a comb polymer which is a water-soluble polyurethane, which comprises reacting:
- (a) a moles of an organic polyisocyanate;
- (b) b moles of a polyethylene glycol homopolymer or copolymer with up to 50 mole percent C.sub.3 to C.sub.5 polyoxyalkylene or the monomeric equivalent of said polyethylene glycol;
- and
- (c) c moles of a hydrophobe reactant containing a monovalent hydrophobic group providing a molar volume contribution of at least about 130 cc/mole wherein:
- b is at least about 2;
- c is at least about 2;
- and
- a is such that ##EQU6## is between about 0.50 to about 1.25 and sufficient to provide a polymer molecular weight of at least about 10,000;
- (d) in a manner sufficient to produce said polymer with (1) at least one monovalent hydrophobic group separated from each end of the polymer by at least one polyethylene glycol residue, and (2) a hydrophilic/lipophilic balance of between about 14 to about 19.5.
6 more elements
Dependencies are inferred from the claim text.