Claims
- 1. A encapsulated particle for use in liquid cleaning compositions comprising:
- a. 20-90% by weight of a continuous coating blend comprised of
- i. 70 wt. % to 1 wt. % of a polyvinyl ether material having a formula
- [C.sub.x H.sub.2x O].sub.y (I)
- wherein x is an integer from 18-22 and y is an integer from 150-300; and
- ii. 30% to 99% of a paraffin wax having a melting point range of from about 30.degree. C. to about 60.degree. C.
- wherein the coating blend has a viscosity of less than about 200 centipoises as measured by a cone and plate rheometer at 80.degree. C., a melting point range of about 40.degree. C. to about 50.degree. C. and a solids content of from about 35 to 100% at 40.degree. C. and from about 0 to about 15% at 50.degree. C.; and
- b. 10 to 80% by weight of a core particle or an aggregate of core particles which are water soluble or water dispersible, or which dissolve, disperse or melt in a temperature range of from about 40.degree. C. to about 50.degree. C.
- wherein the particle is stable in an alkaline environment and exhibits a volume % compressibility of 20 or less at 30.degree. C.
- 2. The encapsulated particle according to claim 1 wherein the polyvinyl ether material is present in the coating blend in an amount of 70% to about 3%.
- 3. The encapsulated particle according to claim 2 wherein the polyvinyl ether material is present in the coating blend in an amount of 50% to about 5%.
- 4. The encapsulated particle according to claim 1 wherein the paraffin wax has a melting point range of from about 40.degree. C. to about 60.degree. C.
- 5. The encapsulated particle according to claim 1 wherein the core material is selected from a group consisting of an oxidative bleach, a bleach catalyst, an enzyme, a percompound activator and a surfactant.
- 6. The encapsulated particle according to claim 5 wherein the core particle is an oxidative bleach.
- 7. The encapsulated particle according to claim 6 wherein the oxidative bleach is a hypochlorite-generating compound.
- 8. The encapsulated particle according to claim 6 wherein the oxidative bleach is a peroxygen compound.
- 9. The encapsulated particle according to claim 8 wherein the peroxygen compound is a hydrogen peroxide generating compound.
- 10. The encapsulated particle according to claim 1 wherein the core material is a cleaning enzyme selected from the group consisting of a protease, a lipase, an amylase, an oxidase, a cellulose and mixtures thereof.
- 11. The encapsulated particle according to claim 1 wherein the core material is a bleach catalyst.
- 12. The encapsulated particle according to claim 1 wherein the core material is a percompound activator.
- 13. An encapsulated particle for use in liquid cleaning compositions having 20-90% by weight of a continuous coating blend comprised of:
- i. 70 wt. % to 1 wt. % of a polyvinyl ether material having a formula
- [C.sub.x H.sub.2x O].sub.y (I)
- wherein x is an integer from 18-22 and y is an integer from 150-300; and
- ii. 30% to 99% of a paraffin wax having a melting point range of from about 30.degree. C. to about 60.degree. C.,
- wherein the coating blend has a viscosity of less than about 200 centipoises as measured by a cone and plate rheometer at 80.degree. C., a melting point range of about 40.degree. C. to about 50.degree. C. and a solids content of from about 35 to 300% at 40.degree. C. and from about 0 to about 15% at 50.degree. C., and
- 10to 80% by weight of a core particle or an aggregate of core particles which are water soluble or water dispersible, or which dissolve, disperse or melt in a temperature range of from about 40.degree. C. to about 50.degree. C.,
- the continuous coating blend being coated around the core particle or aggregate of core particles by a process comprising the steps of:
- (a) heating the coating blend to a temperature above a melting temperature of the coating blend to sufficiently melt the blend to form a molten mixture;
- (b) rotating the core particle or aggregate of core particles in a substantially helical pattern in an inner zone of an encapsulation apparatus;
- (c) spraying the molten coating mixture onto the core particle or aggregate of core particles rotated in step (b) at a rate and for a time sufficient to apply a continuous coherent coating of from about 100 to about 1500 microns thick around each of the particles; and
- (d) passing air upwardly through an outer zone of the encapsulation apparatus to maintain a temperature of a bed within the inner zone of from about 15.degree. C. to about 30.degree. C. below the melting point of the coating blend mixture to fluidize and cool the particles and form a batch of encapsulated particles having a continuous coating blend which is stable in a liquid alkaline environment and exhibits a volume % compressibility of 20 or less at 30.degree. C.
- 14. The encapsulated particle according to claim 13 wherein the particles rotated in step (b) exhibit a momentum of between about 0.1 gram centimeter per second and 15 grams centimeter per second.
- 15. The encapsulated particle according to claim 13 wherein the temperature of the bed in the inner zone is less than 20.degree. C.
Parent Case Info
This application is a Continuation-in-Part of U.S. Ser. No. 08/239,663, filed on May 9, 1994 now U.S. Pat. No. 5,460,743.
US Referenced Citations (9)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
239663 |
May 1994 |
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