Patent ID: 6221826
Filing Date: 2001-04-24
Classification: C11D

Abstract:
A laundry additive particle comprising:i) a central core particle, said core particle comprising a porous carrier core material and a glassy encapsulating material intermixed with said carrier material; said glassy encapsulating material derived from one or more at least partially water-soluble hydroxylic compounds having an anhydrous, nonplasticized, glass transition temperature, T.sub.g, of at least 0.degree. C. and said porous carrier core material is selected from the group consisting of amorphous silicates, crystalline nonlayer silicates, layer silicates, calcium carbonates, calcium/sodium carbonate double salts, sodium carbonates, clays, zeolites, sodalites, alkali metal phosphates, macroporous zeolites, chitin microbeads, carboxyalkylcelluloses, carboxyalkylstarches, cyclodextrins, porous starches and mixtures thereof;ii) an intermediate encapsulating material coated on said central core particle, said intermediate encapsulating material comprising a carbohydrate material having an anhydrous, nonplasticized, glass transition temperature, T.sub.g, of at least 130.degree. C.; andiii) an external coating material coated on said intermediate encapsulating material and providing said laundry additive particle with a substantially non-tacky surface; said external coating material being derived from one or more at least partially wash soluble or dispersible compounds selected from the group consisting of waxes, water soluble polymers, fatty compounds, carbohydrates, cellulose and cellulose derivatives, natural and synthetic gums, silicates, borates, phosphates, chitin and chitosan, and mixtures thereof;wherein said laundry additive particle has a hygroscopicity value of less than 80%.