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US 2003/0164476 A1Published application
Triggered response compositions
AssigneeRohm and Haas Company
InventorsHailan Guo, Ching-Jen Chang
Life of this patent
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Abstract
This invention provides a triggered response composition in the form of a barrier material and a delivery device that includes one or more polyelectrolytes in contact with an aqueous system that is stable and insoluble in an aqueous system and that exhibits one or more chemical/physical responses in the aqueous system, wherein the chemical/physical response of the composition is triggered upon one or more changes in ionic strength of the aqueous system.
Claims10
A triggered response composition comprising:
- one or more polyelectrolytes in contact with an aqueous system that is stable and insoluble in an aqueous system at relatively high ionic strength and that exhibits one or more chemical/physical responses selected from dispersing, disintegrating, dissolving, destabilizing, swelling, deforming, softening, flowing and combinations thereof, wherein the chemical/physical response of the composition is triggered upon one or more ionic strength changes to the aqueous system;
- wherein the polyelectrolyte is one or more alkali soluble or swellable emulsion polymers comprising:
- (a) 15-70 weight percent of one or more acidic monomers;
- (b) 15-80 weight percent of one or more non-ionic vinyl monomers;
- (c) 2-30 weight percent of one or more non-ionic vinyl surfactant monomers;
- and, optionally, (d) 0-5 weight percent of one or more polyethylenically unsaturated monomers;
- and wherein the chemical/physical response of the polymers as a function of ionic strength changes is dependent on one or more parameters selected from the group consisting of (i) the type and amounts of acidic monomers, (ii) the degree of neutralization of the acidic monomers, (iii) the type and amounts of non-ionic vinyl surfactant monomers, (iv) the type and amounts of non-ionic vinyl monomers, (v) the type and amounts of polyethylenically unsaturated monomers, (vi) the pH of the aqueous system and (vii) combinations thereof.
4 more elements
A triggered response barrier composition comprising:
- one or more polyelectrolytes in contact with an aqueous system, wherein the barrier composition surrounds, encapsulates or forms a matrix with one or more active ingredients;
- wherein the barrier composition is stable and insoluble in an aqueous system at relatively high ionic strength;
- wherein the barrier exhibits one or more chemical/physical responses selected from dispersing, disintegrating, dissolving, destabilizing, swelling, deforming, softening, flowing and combinations thereof;
- wherein the chemical/physical response of the composition is triggered upon one or more ionic strength changes to the aqueous system;
- and wherein the barrier composition is capable of releasing the active ingredients to the aqueous system as a result of the triggered response.
2 more elements
A device for the triggered release of one or more active ingredients to an aqueous system comprising:
- (d) one or more active ingredients;
- (e) one or more additives;
- and
- (f) a barrier composition comprising one or more ionic strength responsive polyelectrolytes;
- wherein the barrier composition surrounds, encapsulates or forms a matrix with one or more active ingredients;
- wherein the barrier composition is stable and insoluble in an aqueous system at relatively high ionic strength;
- wherein the barrier exhibits one or more chemical/physical responses selected from dispersing, disintegrating, dissolving, destabilizing, swelling, deforming, softening, flowing and combinations thereof;
- wherein the chemical/physical response of the composition is triggered upon one or more ionic strength changes to the aqueous system;
- and wherein the device is capable of releasing the active ingredients to the aqueous system as a result of the triggered response of the barrier composition.
6 more elements
A process for triggering the release of one or more active ingredients to an aqueous system comprising the steps of:
- (c) Surrounding, encapsulating or forming a matrix with one or more active ingredients with an ionic strength responsive barrier composition, the barrier being substantially impermeable to releasing the active ingredients to the aqueous system and remaining insoluble in the aqueous system;
- and
- (d) altering the ionic strength of the aqueous system;
- wherein the barrier composition disperses, disintegrates, dissolves, deforms or swells and becomes substantially permeable, thereby triggering the release of the active ingredients into the aqueous system.
1 more element
Dependencies are inferred from the claim text.