Hydrogel compositions
AssigneeLubrizol Advanced Materials, Inc.
InventorsNancy S. Marchant, James R. Baxter, Paul M. Basone
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Abstract
A hydrogel composition from a cross-linked polymer derived from one or more olefinically unsaturated polymerizable carboxylic monomers and a thermoplastic polyurethane composition is disclosed. The hydrogel exhibits high yield stress at low shear. The hydrogel composition provides useful materials for personal care, health care, medical and pharmaceutical applications, among others.
Claims26
A hydrogel blend composition comprising:
- a) a crosslinked polymer derived from one or more olefinically unsaturated polymerizable carboxylic monomers, wherein the crosslinked polymer is partially neutralized;
- b) an optional comonomer;
- and
- c) a water-soluble thermoplastic polyurethane (TPU) comprising the reaction product of:
- i) a polyisocyanate;
- and
- ii) a polyol component comprising of at least one polyethylene glycol polyol;
- wherein the composition exhibits high yield stress at low shear.
A hydrogel blend composition comprising:
- a) a crosslinked polymer derived from one or more olefinically unsaturated polymerizable carboxylic monomers, wherein the crosslinked polymer is partially neutralized;
- b) an optional comonomer;
- and
- c) a water soluble thermoplastic polyurethane (TPU) comprising the reaction product of:
- i) an aliphatic or aromatic diisocyanate;
- and
- ii) a polyol component comprising of at least one polyethylene glycol having a number average molecular weight (Mn) of at least 1450;
- wherein the composition exhibits high yield stress at low shear.
A process of making a hydrogel composition, said process comprising the steps of:
- (I) blending:
- a) a crosslinked polymer derived from one or more olefinically unsaturated polymerizable carboxylic monomers, wherein the crosslinked polymer is partially neutralized;
- and
- b) a water soluble thermoplastic polyurethane comprising the reaction product of:
- i) a polyisocyanate;
- and
- ii) a polyol component comprising of at least one polyethylene glycol polyol;
- wherein the resulting hydrogel composition has a viscosity of from 3,000 to 200,000 mPa*s.
A hydrogel blend composition comprising:
- a) a homopolymer of a crosslinked polymer derived from one or more olefinically unsaturated polymerizable carboxylic monomers, wherein the crosslinked polymer is partially neutralized;
- and
- b) a hydrophilic thermoplastic polyurethane wherein the hydrogel composition exhibits:
- i) a viscosity of from 3,000 to 200,000 mPa*s;
- and
- ii) a shear response as measured by microviscosity of from 130 mPa*s to about 2,500 mPa*s.
Dependencies are inferred from the claim text.