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US 2004/0110891 A1Published application
Multi-stage polymer compositions having a triggered response
OwnerHailan Guo, Ching-Jen Changinventors
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Abstract
This invention provides barrier materials and devices prepared from multi-stage polymer compositions that protect active ingredients and beneficial agents in an aqueous system and that are triggered to release such agents to an environment of use.
Claims9
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 upon one or more ionic strength changes to the aqueous system;
- wherein the polyelectrolyte comprises (a) 70-99 weight percent of an alkali soluble/swellable emulsion polymer as a first stage;
- and (b) 1 to 30 weight percent of a more cross-linked alkali soluble/swellable emulsion polymer or a non-alkali soluble/swellable emulsion polymer as a second stage.
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 upon one or more ionic strength changes to the aqueous system;
- wherein the barrier composition is capable of releasing the active ingredients to the aqueous system as a result of the triggered response;
- and wherein the barrier has improved mechanical strength and wet strength.
2 more elements
A device for the triggered release of one or more active ingredients to an aqueous system comprising:
- (a) one or more active ingredients;
- (b) one or more additives;
- and
- (c) a barrier composition comprising one or more ionic strength responsive multi-stage emulsion polymers;
- 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:
- (a) 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
- (b) 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.