US4464281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized bleach-sensitive dyes in automatic dishwasher detergent compositions
Assignee: Lever Brothers Co
•
Filing: 1983-07-28
•
Granted: 1984-08-07
•
Expires: 2003-07-28
Abstract
Abstract A method for stabilizing automatic dishwasher detergents containing bleach-sensitive dyes against decolorization by the bleaching agents of the compositions. The detergent powders comprise about 5-70% of a builder, 1-15% of a nonionic surfactant, 1-20% of a silicate, 0-60% of a filler, 0.001-0.1% of a bleach-sensitive dye, water and a bleaching agent. Prior to the addition of bleaching agent, the composition is pre-conditioned by contact with a flow of air. The resultant powder has a color that remains essentially unchanged even after storage for two months at elevated temperatures.
Inventors
- 👤 Anthony Rapisarda
- 👤 Edilia Camps
- 👤 Herbert Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:45
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3958; C11D3/40
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
109 words
An automatic dishwasher detergent powder comprising: (a) from about 5% to about 70% of a builder; (b) from about 1% to about 15% of a nonionic surfactant; (c) from about 1% to about 20% of a silicate; (d) from about 0% to about 60% of a filler; (e) from about 0.001% to about 0.1% of a bleach-sensitive dye; and (f) water; wherein the composition is pre-conditioned by contact with a flow of air prior to the addition of a bleaching agent, said bleach present in an effective amount to clean dishes, affording a resultant powder whose color remains essentially unchanged even after storage for two months at elevated temperature.
Claim 2
Dependent Claim
109 words
An automatic dishwasher detergent powder comprising: (a) from about 5% to about 70% of a builder; (b) from about 1% to about 15% of a nonionic surfactant; (c) from about 1% to about 20% of a silicate; (d) from about 0% to about 60% of a filler; (e) from about 0.001% to about 0.1% of a bleach-sensitive dye; and (f) water; wherein the composition is pre-conditioned by contact with a flow of air prior to the addition of a bleaching agent, said bleach present in an effective amount to clean dishes, affording a resultant powder whose color remains essentially unchanged even after storage for two months at elevated temperature.
Claim 3
Dependent Claim
19 words
An automatic dishwasher detergent powder according to claim 1 wherein the bleaching agent is sodium or potassium dichloroisocyanurate dihydrate.
Claim 4
Dependent Claim
18 words
An automatic dishwasher detergent powder according to claim 1 wherein the nonionic surfactant is a polyoxyethylenepolyoxypropylene block copolymer.
Claim 5
Dependent Claim
72 words
An automatic dishwasher detergent powder according to claim 1, the nonionic surfactant having the formula: ##STR2## wherein R is a linear, alkyl hydrocarbon having an average of 6 to 10 carbon atoms, R' and R" are each linear, alkyl hydrocarbons of about 1 to 4 carbon atoms, x is an integer from 1 to 6, y is an integer from 4 to 15 and z is an integer from 4 to 25.
Claim 6
Dependent Claim
15 words
An automatic dishwasher detergent powder according to claim 1 wherein the filler is sodium sulfate.
Claim 7
Dependent Claim
17 words
An automatic dishwasher detergent powder according to claim 1 wherein the bleach-sensitive dye has a yellow color.
Claim 8
Dependent Claim
39 words
An automatic dishwasher detergent powder according to claim 5 wherein the yellow dye is selected from the group consisting of FD&C Yellow 5, FD&C Yellow 6, FD&C Yellow 7, FD&C Yellow 8 and D&C Yellow 10 and mixtures thereof.
Claim 9
Dependent Claim
38 words
An automatic dishwasher detergent powder according to claim 5 wherein the yellow dye is selected from the group consisting of External D&C Yellow No. 7, Acid Yellow 4, Acid Yellow 17 and Acid Yellow 40 and mixtures thereof.
Claim 10
Dependent Claim
15 words
An automatic dishwasher detergent powder according to claim 1 wherein the builder is sodium tripolyphosphate.
Claim 11
Dependent Claim
25 words
An automatic dishwasher detergent powder according to claim 9 wherein sodium tripolyphosphate is present to provide a phosphorus level from about 6.1% to about 8.7%.
Claim 12
Dependent Claim
15 words
An automatic dishwasher detergent powder according to claim 1 wherein the silicate is sodium silicate.
Claim 13
Dependent Claim
15 words
An automatic dishwasher detergent powder according to claim 1 wherein the builder is sodium carbonate.
Claim 14
Dependent Claim
18 words
An automatic dishwasher detergent powder according to claim 1 wherein the builder is sodium carbonate and sodium tripolyphosphate.
Claim 15
Independent Claim
116 words
A method for preparing an automatic dishwasher detergent powder comprising: (i)combining into one mixture (a) from about 5% to about 70% of a builder; (b) from about 1% to about 15% of a nonionic surfactant; (c) from about 1% to about 20% of a silicate; (d) from about 0% to about 60% of a filler; (e) from about 0.001% to about 0.1% of a bleach-sensitive dye; and (f) water; (ii) pre-conditioning the mixture by contact with a flow of air; and (iii) dosing the pre-conditioned mixture with a bleaching agent in an effective amount to clean dishes; the resultant powder having a color that remains essentially unchanged even after storage for two months at elevated temperatures.
Claim 16
Independent Claim
116 words
A method for preparing an automatic dishwasher detergent powder comprising: (i)combining into one mixture (a) from about 5% to about 70% of a builder; (b) from about 1% to about 15% of a nonionic surfactant; (c) from about 1% to about 20% of a silicate; (d) from about 0% to about 60% of a filler; (e) from about 0.001% to about 0.1% of a bleach-sensitive dye; and (f) water; (ii) pre-conditioning the mixture by contact with a flow of air; and (iii) dosing the pre-conditioned mixture with a bleaching agent in an effective amount to clean dishes; the resultant powder having a color that remains essentially unchanged even after storage for two months at elevated temperatures.
Claim 17
Dependent Claim
14 words
A method according to claim 14 wherein preconditioning is conducted in a fluidized bed.
Claim 18
Dependent Claim
20 words
A method according to claim 14 wherein air at from about 10° C. to 100° C. is used for pre-conditioning.
Claim 19
Dependent Claim
27 words
A method according to claim 16 wherein a first hotter flow of air is employed to pre-condition the composition followed by treatment with a cooler air flow.
Claim 20
Dependent Claim
16 words
A method according to claim 14 wherein the bleaching agent is sodium or potassium dichloroisocyanurate dihydrate.
Claim 21
Dependent Claim
15 words
A method according to claim 14 wherein the nonionic surfactant is a polyoxyethylene-polyoxypropylene block copolymer.
Claim 22
Dependent Claim
69 words
A method according to claim 14, the nonionic surfactant having the formula: ##STR3## wherein R is a linear, alkyl hydrocarbon having an average of 6 to 10 carbon atoms, R' and R" are each linear, alkyl hydrocarbons of about 1 to 4 carbon atoms, x is an integer from 1 to 6, y is an integer from 4 to 15 and z is an integer from 4 to 25.
Claim 23
Dependent Claim
12 words
A method according to claim 14 wherein the filler is sodium sulfate.
Claim 24
Dependent Claim
14 words
A method according to claim 14 wherein the bleach-sensitive dye has a yellow color.
Claim 25
Dependent Claim
36 words
A method according to claim 22 wherein the yellow dye is selected from the group consisting of FD&C Yellow 5, FD&C Yellow 6, FD&C Yellow 7, FD&C Yellow 8 and D&C Yellow 10 and mixtures thereof.
Claim 26
Dependent Claim
35 words
A method according to claim 22 wherein the yellow dye is selected from the group consisting of External D&C Yellow No. 7, Acid Yellow 4, Acid Yellow 17 and Acid Yellow 40 and mixtures thereof.
Claim 27
Dependent Claim
12 words
A method according to claim 14 wherein the builder is sodium tripolyphosphate.
Claim 28
Dependent Claim
22 words
A method according to claim 25 wherein sodium tripolyphosphate is present to provide a phosphorus level from about 6.1% to about 8.7%.
Claim 29
Dependent Claim
12 words
A method according to claim 14 wherein the silicate is sodium silicate.
Claim 30
Dependent Claim
12 words
A method according to claim 14 wherein the builder is sodium carbonate.
Claim 31
Dependent Claim
15 words
A method according to claim 14 wherein the builder is sodium carbonate and sodium tripolyphosphate.
Claim 32
Dependent Claim
27 words
A method according to claim 14 wherein portions of the bleach-sensitive dye are added in more than one stage to the composition but all prior to pre-conditioning.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |