US4655780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated bleach particles coated with a mixture of C16 -C18 and C12 -C14 fatty acid soaps
Assignee: Lever Brothers Co
•
Filing: 1985-12-31
•
Granted: 1987-04-07
•
Expires: 2005-12-31
Abstract
Abstract Hard spherical bleaching particles are disclosed whose composition is an intimately dispersed agglomerated core mixture of an active halogen oxidizing material, an inorganic diluent salt and a binder. The cores are coated with a mixture of from about 70-85% of a C 16 -C 18 fatty acid soap and from about 15-30% of a C 12 -C 14 fatty acid soap. A method for bleaching substrates as well as a process for preparing the bleach particles are disclosed.
Inventors
- 👤 Kil Whan Chun
- 👤 David J. Lang
- 👤 Edward Santos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:21
CPC Classifications
C; C11; C11D; C11D9/00; C11D9/04; C11D9/22; C11D9/28; C11D17/00; C11D17/0039; C11D3/00; C11D3/395
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
132 words
Hard spherical bleaching particles whose composition is an intimately dispersed agglomerated mixture comprising: (i) from about 1 to 80% by weight of an oxidizing material having at least one reactive chlorine or bromine in its molecular structure; (ii) from about 1 to 80% by weight of an inorganic diluent salt; (iii) from about 0.5 to 60% by weight of a binder with melting point 85° to 120° F.; and (iv) from about 5 to 50% by weight of a coating covering a core mixture of elements (i) through (iii) consisting essentially of a mixture of from about 70 to about 85% by weight of alkali metal C 16 -C 18 fatty acid soap and from about 15 to about 30% by weight of C 12 -C 14 alkali metal fatty acid soap.
Claim 2
Dependent Claim
132 words
Hard spherical bleaching particles whose composition is an intimately dispersed agglomerated mixture comprising: (i) from about 1 to 80% by weight of an oxidizing material having at least one reactive chlorine or bromine in its molecular structure; (ii) from about 1 to 80% by weight of an inorganic diluent salt; (iii) from about 0.5 to 60% by weight of a binder with melting point 85° to 120° F.; and (iv) from about 5 to 50% by weight of a coating covering a core mixture of elements (i) through (iii) consisting essentially of a mixture of from about 70 to about 85% by weight of alkali metal C 16 -C 18 fatty acid soap and from about 15 to about 30% by weight of C 12 -C 14 alkali metal fatty acid soap.
Claim 3
Dependent Claim
23 words
Particles according to claim 1 wherein the coating is present from about 25 to about 35% by weight of the total encapsulated particle.
Claim 4
Dependent Claim
14 words
Particles according to claim 1 wherein the oxidizing material is an alkali metal dichloroisocyanurate.
Claim 5
Dependent Claim
11 words
Particles according to claim 1 wherein the binder is lauric acid.
Claim 6
Dependent Claim
16 words
Particles according to claim 1 wherein the binder is selected from soap, polyvinylpyrrolidone and mixtures thereof.
Claim 7
Dependent Claim
22 words
Particles according to claim 1 wherein the oxidizing material is present in an amount from about 2 to about 40% by weight.
Claim 8
Dependent Claim
13 words
Particles according to claim 1 wherein sodium tripolyphosphate is the inorganic diluent salt.
Claim 9
Dependent Claim
18 words
Particles according to claim 1 wherein the binder is present from about 10 to about 30% by weight.
Claim 10
Dependent Claim
48 words
A detergent composition comprising from about 0.5 to about 80% by weight of hard spherical bleaching particles according to claim 1 and from about 2 to about 50% by weight of a surfactant selected from the group consisting of anionic, nonionic, zwitterionic, amphoteric, cationic surfactants and mixtures thereof.
Claim 11
Dependent Claim
22 words
A detergent composition according to claim 9 further comprising from about 2 to about 80% of an organic or inorganic builder salt.
Claim 12
Dependent Claim
23 words
A method for bleaching substrates comprising applying the hard spherical bleaching particles of claim 1 suspended in an aqueous medium to said substrate.
Claim 13
Dependent Claim
22 words
A method according to claim 11 wherein the substrate is selected from the group consisting of fabrics, dentures, metals, ceramics and wood.
Claim 14
Dependent Claim
110 words
A process for preparing the bleaching particles of claim 1 comprising the steps of: (i) mixing said oxidizing material, inorganic diluent salt and binder in a heated vessel to produce said core particles; (ii) charging said core particles to a fluid bed dryer; and (iii) spraying a solution of said alkali metal C 16 -C 18 fatty acid soap and C 12 -C 14 alkali metal fatty acid soap coating mixture onto said core particles undergoing agitation in the fluid bed dryer, said solution comprising from about 0.5 to about 50% by weight of said soap mixture and about 50% to about 99.5% by weight of a low-boiling organic solvent.
Claim 15
Dependent Claim
26 words
A process according to claim 13 wherein said solvent is selected from the group consisting of low boiling alcohols, hydrocarbons, halocarbons, ethers, esters and mixtures thereof.
Claim 16
Dependent Claim
17 words
A process according to claim 14 wherein the solvent is selected from methanol, acetone and mixtures thereof.
Claim 17
Dependent Claim
22 words
A process according to claim 13 wherein the solvent has a boiling point of from about 40° F. to about 250° F.
Claim 18
Dependent Claim
22 words
A process according to claim 16 wherein the solvent has a boiling point of from about 50° F. to about 180° F.
Claim 19
Dependent Claim
24 words
A process according to claim 13 wherein the fluid bed is maintained at a temperature of from about 50° F. to about 300° F.
Claim 20
Dependent Claim
32 words
A process according to claim 13 wherein the temperature of the fluid bed dryer is maintained at from 10° F. to about 200° F. greater than the boiling point of said solvent.
Claim 21
Dependent Claim
24 words
A process according to claim 13 wherein soap is present in the solution from about 5% to about 40% by weight of the solution.
References Cited (Backward Citations)
GB911410A
Cited
US3112274A
Cited
US3609088A
Cited
US3650961A
Cited
US3959165A
Cited
US3971726A
Cited
US3933670A
Cited
US3908045A
Cited
US4136052A
Cited
US4237024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |