US4863626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated enzyme in dry bleach composition
Assignee: Clorox Co
•
Filing: 1987-05-04
•
Granted: 1989-09-05
•
Expires: 2007-05-04
Abstract
Abstract Methods and compositions for increased stability of enzymes in oxidant dry bleach. Enzyme stability is adversely affected by increased temperature, humidity, and the presence of strong oxidants, such as peracids. The instant invention provides enzyme stability in the presence of oxidant bleaches by coating or encapsulating the enzyme, while providing enzyme solubility suitable for use in bleach mixtures upon introduction to an aqueous medium. Particularly, alkali and neutral materials act as protection agents, which neutralize oxidant species before they contact and denature the enzyme. Other standard bleaching composition adjuncts such as builders, fillers, buffers, brighteners, fragrances, and the like may be included in the enzyme-containing oxidant bleach composition in addition to the discrete coated enzyme granules.
Inventors
- 👤 Thomas Coyne
- 👤 J. Bruce England
- 👤 Blanca Haendler
- 👤 Frances E. Mitchell
- 👤 Dale S. Steichen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C11D17/00; C11D17/04; C11D17/041; C11D3/02; C11D3/04; C11D3/046; C11D3/38; C11D3/386; C11D3/38645; C11D3/38672; C11D3/39; C11D3/3902; C11D3/3937; C11D3/3945; C11D3/40; C11D3/42; C11D3/50; C11D3/502; C11D3/505
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
45 words
A hydrolase enzyme-containing composition which has enhanced stability despite prolonged storage in the presence of peracid oxidant bleaches and improved solubility in an aqueous medium, said composition comprising: (a) a hydrolase; and (b) an alkali metal silicate coating therefor which substantially completely encapsulates said enzyme.
Claim 2
Dependent Claim
45 words
A hydrolase enzyme-containing composition which has enhanced stability despite prolonged storage in the presence of peracid oxidant bleaches and improved solubility in an aqueous medium, said composition comprising: (a) a hydrolase; and (b) an alkali metal silicate coating therefor which substantially completely encapsulates said enzyme.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein said enzyme is selected from the group consisting of proteases, amylases, lipases, cellulases, and mixtures thereof.
Claim 4
Dependent Claim
12 words
The composition of claim 2 wherein said enzyme is an alkaline protease.
Claim 5
Dependent Claim
28 words
The composition of claim 1 wherein said alkali metal silicate coating is a sodium silicate having an SiO 2 :Na 2 O ratio of about 1:1 to 3:1.
Claim 6
Dependent Claim
22 words
The composition of claim 4 wherein said sodium silicate has an SiO 2 :Na 2 O ratio of about 1:1 to 2.75:1.
Claim 7
Dependent Claim
23 words
The composition of claim 5 wherein said sodium silicate has an SiO 2 :Na 2 O ratio of about 1.5:1 to about 2.5:1.
Claim 8
Dependent Claim
11 words
The composition of claim 1 further comprising an alkali metal carbonate.
Claim 9
Dependent Claim
13 words
The composition of claim 7 wherein said alkali metal carbonate is sodium carbonate.
Claim 10
Dependent Claim
63 words
A dry, granular peracid bleach and enzyme composition which has enhanced enzyme stability despite prolonged storage in the presence of said peracid bleach and improved enzyme solubility in an aqueous medium, said bleach composition comprising: (a) a organic peracid with the structure ##STR3## wherein R is C 4-20 alkyl; and (b) A hydrolase which is coated substantially completely by an alkali metal silicate.
Claim 11
Dependent Claim
63 words
A dry, granular peracid bleach and enzyme composition which has enhanced enzyme stability despite prolonged storage in the presence of said peracid bleach and improved enzyme solubility in an aqueous medium, said bleach composition comprising: (a) a organic peracid with the structure ##STR3## wherein R is C 4-20 alkyl; and (b) A hydrolase which is coated substantially completely by an alkali metal silicate.
Claim 12
Dependent Claim
31 words
The bleach composition of claim 9 further comprising one or more selected adjuncts from the group consisting of fluorescent whitening agents, bluing agents, fillers, builders, surfactants, pH adjusters, and mixtures thereof.
Claim 13
Dependent Claim
19 words
The bleach composition of claim 9 wherein said organic peracid of (a) is a C 6 - 12 diperacid.
Claim 14
Dependent Claim
13 words
The bleach composition of claim 11 wherein said organic peracid is diperoxydodecanedioic acid.
Claim 15
Dependent Claim
25 words
The bleach composition of claim 9 wherein said enzyme of (b) is selected from the group consisting of protease, amylases, lipases, cellulased, and mixtures thereof.
Claim 16
Dependent Claim
29 words
The bleach composition of claim 9 wherein said coating of (b) is a sodium silicate having an SiO 2 : Na 2 O ratio of about 1:1 to 3:1.
Claim 17
Dependent Claim
17 words
The bleach composition of claim 13 wherein said coating of (b) further comprises an alkali metal carbonate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |