Controlled release materials

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) C08F 20/00 (2006.01) C08L 33/00 (2006.01) C11D 3/37 (2006.01) C11D 17/00 (2006.01)

Patent

CA 2475921

The invention relates to polymers whose water solubility may be triggered by changes in pH, salt concentration, concentration of surfactant or a combination of both. The polymer is a copolymer or terpolymer containing from 2 to 60 mole percent of an amine functionality that has been neutralized with a fixed acid. Specifically films formed from these polymers will be insoluble at a higher pH, but will become soluble at a lower pH. The polymers are also insoluble at a higher salt concentration, but become soluble at a lower salt concentration. The polymers can be used to coat or encapsulate active ingredients, that are released based on changes in the environment, such as in the rinse cycle of a dishwasher or laundry washing machine.

Cette invention concerne des polymères dont l'hydrosolubilité peut être déclenchée par des changements du pH, de la concentration saline, de la concentration de tensioactifs ou par une combinaison des deux. Le polymère est un copolymère ou un terpolymère renfermant de 2 à 60 % molaire d'une fonction amine neutralisée à l'aide d'un acide fixe. Spécifiquement, des films obtenus à partir de ces polymères sont insolubles à un pH élevé, mais deviennent solubles à un pH plus faible. Semblablement, ces polymères sont insolubles lorsque la concentration saline est élevée, mais deviennent solubles à une concentration saline plus faible. Lesdits polymères peuvent être utilisés comme agents de revêtement ou d'encapsulation pour des principes actifs qui sont libérés à la suite de changements d'environnement, par exemple lorsque s'enclenche le cycle de rinçage d'un lave-vaisselle ou d'un lave-linge.

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