US4476046A
Expired / Lapsed
US
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Buffered alkali earth metal surfactant cakes for dosing dispenser
Assignee: Procter and Gamble Co
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Filing: 1982-12-23
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Granted: 1984-10-09
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Expires: 2002-12-23
Abstract
Abstract A solid cake comprising 20% to 90% buffered alkali earth metal alkyl sulfate surfactant. Perfume, dye or salt, or any combination thereof are added. The surfactant and cakes made therefrom have pH's of from about 6 to about 10. The buffered surfactants and their cakes have improved stability and improved longevity. Preferred cakes are made with buffered magnesium alkyl sulfate.
Inventors
- 👤 Louis F. Wong
- 👤 Rosstain F. Sterling
- 👤 Thomas A. Borcher, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:50
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/02; C11D1/12; C11D1/14; C11D1/146; C11D17/00; C11D17/0047; C11D17/0056; C11D17/04; C11D17/041
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
91 words
A substantially stable solid cake comprising from 20% to 90% of an alkali earth metal alkyl sulfate, 0% to 30% perfume, 0% to 12% of a dye, 1% to 40% of a compatible water-soluble salt, and an effective amount of a buffer having a pKa of from 6 to 10; said cake weighing from 10 gms to 120 gms and having a density of 0.8 to 1.5, said cake having a pH of 6 to 10, said cake containing at least 1.5% of at least one of said perfume or dye.
Claim 2
Dependent Claim
91 words
A substantially stable solid cake comprising from 20% to 90% of an alkali earth metal alkyl sulfate, 0% to 30% perfume, 0% to 12% of a dye, 1% to 40% of a compatible water-soluble salt, and an effective amount of a buffer having a pKa of from 6 to 10; said cake weighing from 10 gms to 120 gms and having a density of 0.8 to 1.5, said cake having a pH of 6 to 10, said cake containing at least 1.5% of at least one of said perfume or dye.
Claim 3
Dependent Claim
29 words
The invention of claim 1 wherein said alkali earth metal alkyl sulfate is selected from the group consisting of magnesium alkyl sulfate, calcium alkyl sulfate, and barium alkyl sulfate.
Claim 4
Dependent Claim
51 words
The invention of claim 2 wherein said cake comprises 40% to 70% of said alkali earth metal alkyl sulfate, 10% to 20% perfume, 1.5% to 10% dye, and 5% to 18% water-soluble salt; said cake weighing from 20 gms to 100 gms and having a density of 1 to 1.3 gms/cc.
Claim 5
Dependent Claim
24 words
The invention of claim 3 wherein said alkali earth metal alkyl sulfate contains a carbon chain length of from 8 to 22 carbon atoms.
Claim 6
Dependent Claim
15 words
The invention of claim 4 wherein alkyl chain length is 10 to 16 carbon atoms.
Claim 7
Dependent Claim
12 words
The invention of claim 5 wherein said pH is 7 to 9.5.
Claim 8
Dependent Claim
16 words
The invention of claim 1 wherein said cake has a moisture content of 0.1% to 10%.
Claim 9
Dependent Claim
13 words
The invention of claim 7 wherein the moisture content is 1% to 5%.
Claim 10
Dependent Claim
70 words
A substantially stable solid cake comprising from 20% to 90% of a transition metal alkyl sulfate, 0% to 30% perfume, 0% to 40% of a compatible water-soluble salt, and 0% to 12% of a dye; said cake weighing from 10 gms to 120 gms and having a density of about 0.8 to about 1.5 wherein said cake contains at least 1.5% of at least one combination of perfume or dye.
Claim 11
Dependent Claim
70 words
A substantially stable solid cake comprising from 20% to 90% of a transition metal alkyl sulfate, 0% to 30% perfume, 0% to 40% of a compatible water-soluble salt, and 0% to 12% of a dye; said cake weighing from 10 gms to 120 gms and having a density of about 0.8 to about 1.5 wherein said cake contains at least 1.5% of at least one combination of perfume or dye.
Claim 12
Dependent Claim
26 words
The invention of claim 9 wherein said transition metal alkyl sulfate is selected from the group consisting of iron, copper, zinc, silver, and cadmium alkyl sulfates.
Claim 13
Dependent Claim
32 words
The invention of claim 10, wherein said cake comprises 40% to 70% of said alkyl sulfate, 10% to 20% perfume, 1.5% to 10% dye and 5% to 18% of a water-soluble salt.
Claim 14
Dependent Claim
21 words
The invention of claim 11 wherein said alkyl sulfate contains a carbon chain length of from 8 to 22 carbon atoms.
Claim 15
Dependent Claim
16 words
The invention of claim 12 wherein said alkyl chain length is 10 to 16 carbon atoms.
Claim 16
Dependent Claim
12 words
The invention of claim 13 wherein said pH is 7 to 9.5.
Claim 17
Dependent Claim
98 words
A substantially stable solid surfactant cake comprising from 20% to 90% of an anionic surfactant selected from the group consisting of aluminum alkyl sulfate, tin alkyl sulfate, lead alkyl sulfate, and barium alkyl sulfate; 1% to 40% of a compatible water-soluble salt; and an effective amount of a buffer having a pKa of from 6 to 10, said cake weighing from 10 gms to 120 gms and having a density of 0.8 to 1.5, said cake having a pH of 6 to 10, said cake containing at least 1.5% of at least one of said perfume or dye.
Claim 18
Dependent Claim
98 words
A substantially stable solid surfactant cake comprising from 20% to 90% of an anionic surfactant selected from the group consisting of aluminum alkyl sulfate, tin alkyl sulfate, lead alkyl sulfate, and barium alkyl sulfate; 1% to 40% of a compatible water-soluble salt; and an effective amount of a buffer having a pKa of from 6 to 10, said cake weighing from 10 gms to 120 gms and having a density of 0.8 to 1.5, said cake having a pH of 6 to 10, said cake containing at least 1.5% of at least one of said perfume or dye.
Claim 19
Dependent Claim
32 words
The invention of claim 15 wherein said cake comprises 40% to 70% of said alkyl sulfate, 10% to 20% perfume, 1.5% to 10% dye and 5% to 18% of a water-soluble salt.
Claim 20
Dependent Claim
22 words
The invention of claim 16 wherein said alkyl sulfate contains a alkyl carbon chain length of from 8 to 22 carbon atoms.
Claim 21
Dependent Claim
16 words
The invention of claim 17 wherein said alkyl chain length is 10 to 16 carbon atoms.
Claim 22
Dependent Claim
12 words
The invention of claim 18 wherein said pH is 7 to 9.5.
Claim 23
Dependent Claim
92 words
A substantially stable solid cake comprising from 20% to 90% of an alkali earth metal alkyl sulfate, 0% to 30% perfume, 0% to 12% of a dye, 1% to 40% of a compatible water-soluble salt, and an effective amount of a buffer having a pKa of from 6 to 10; said cake weighing from 10 gms to 120 gms and having a density of 0.8 to 1.5, said cake having a pH of 6 to 10 wherein said cake contains at least 10% of a combination of perfume, dye and water-soluble salt.
Claim 24
Dependent Claim
92 words
A substantially stable solid cake comprising from 20% to 90% of an alkali earth metal alkyl sulfate, 0% to 30% perfume, 0% to 12% of a dye, 1% to 40% of a compatible water-soluble salt, and an effective amount of a buffer having a pKa of from 6 to 10; said cake weighing from 10 gms to 120 gms and having a density of 0.8 to 1.5, said cake having a pH of 6 to 10 wherein said cake contains at least 10% of a combination of perfume, dye and water-soluble salt.
Claim 25
Dependent Claim
15 words
The invention of claim 20 wherein said cake contains at least 2% sodium alkyl sulfate.
Claim 26
Independent Claim
59 words
A method of making stable solid alkali earth metal alkyl sulfate surfactant comprising reacting an alkali earth metal salt with an alkali metal alkyl sulfate salt in the presence of an effective amount of a buffer having a pKa of from 6 to 10; said alkali earth metal alkyl sulfate surfactant having a pH of from 6 to 10.
Claim 27
Independent Claim
59 words
A method of making stable solid alkali earth metal alkyl sulfate surfactant comprising reacting an alkali earth metal salt with an alkali metal alkyl sulfate salt in the presence of an effective amount of a buffer having a pKa of from 6 to 10; said alkali earth metal alkyl sulfate surfactant having a pH of from 6 to 10.
Claim 28
Dependent Claim
21 words
The invention of claim 22 wherein said pKa is from 7 to 9.5 and said pH is from 7 to 9.5.
Claim 29
Dependent Claim
28 words
The invention of claim 22 wherein said buffer is sodium carbonate used at a level of 0.5% to 3% by weight of the alkali earth metal alkyl sulfate.
Claim 30
Dependent Claim
15 words
The invention of claim 24 wherein said alkali earth metal sulfate is magnesium alkyl sulfate.
Claim 31
Independent Claim
55 words
A method of making stable solid alkali earth metal alkyl sulfate comprising reacting an alkali earth metal salt with an alkyl sulfuric acid and buffering the reaction product with an effective amount of a suitable buffer having a pKa of 6 to 10 to provide a product having a pH of from 6 to 10.
Claim 32
Independent Claim
55 words
A method of making stable solid alkali earth metal alkyl sulfate comprising reacting an alkali earth metal salt with an alkyl sulfuric acid and buffering the reaction product with an effective amount of a suitable buffer having a pKa of 6 to 10 to provide a product having a pH of from 6 to 10.
Claim 33
Dependent Claim
21 words
The invention of claim 26 wherein said pKa is from 7 to 9.5 and said pH is from 7 to 9.5.
Claim 34
Dependent Claim
16 words
The invention of claim 27 wherein said alkali earth metal alkyl sulfate is magnesium alkyl sulfate.
Claim 35
Dependent Claim
10 words
The invention of claim 28 wherein said alkyl is lauryl.
Claim 36
Dependent Claim
18 words
The invention of claim 29 wherein said magnesium alkyl sulfate has a pH of from 6 to 10.
Claim 37
Dependent Claim
13 words
The invention of claim 30 wherein said pH is from 7 to 9.5.
Claim 38
Dependent Claim
21 words
The invention of claim 31, wherein said stable solid magnesium alkyl sulfate has a moisture content of from 0.1% to 10%.
Claim 39
Dependent Claim
13 words
The invention of claim 32 wherein said moisture content is 1% to 5%.
References Cited (Backward Citations)
US2678921A
Cited
US3350320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |