US4900468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized liquid hydrogen peroxide bleach compositions
Assignee: Clorox Co
•
Filing: 1988-01-11
•
Granted: 1990-02-13
•
Expires: 2008-01-11
Abstract
Abstract Aqueous peroxide bleaching compositions that include surfactant, fluorescent whiteners and dyes are effectively stabilized by the addition of a heavy metal chelating agent and a free radical scavenging agent. Both agents must be present to achieve maximum stability. Particularly preferred chelating agents are the amino polyphosphonates. Particularly preferred free radical scavenging agents are the hydroxybenzenes and especially substituted phenols. Not only is the peroxide oxidizing agent stabilized, but surfactant, fluorescent whitener, and dye as well.
Inventors
- 👤 James D. Mitchell
- 👤 James P. Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:12
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/037; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3937; C11D3/394; C11D3/3947
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A stabilized liquid peroxide bleaching composition comprising a liquid hydrogen peroxygen component, an organic component selected from fluorescent whiteners, dyes and mixtures thereof, and a stabilizing system comprising 0.02-5.0 wt.% of an amino polyphosphonate as a chelating agent selected for chelating polyvalent heavy metal cations and an effective amount of a partially hindered substituted hydroxybenzene as a free radical scavenging agent, said stabilizing system synergistically increasing stability of said organic component while allowing the peroxygen component to retain most of its initial oxidation potential.
Claim 2
Dependent Claim
84 words
A stabilized liquid peroxide bleaching composition comprising a liquid hydrogen peroxygen component, an organic component selected from fluorescent whiteners, dyes and mixtures thereof, and a stabilizing system comprising 0.02-5.0 wt.% of an amino polyphosphonate as a chelating agent selected for chelating polyvalent heavy metal cations and an effective amount of a partially hindered substituted hydroxybenzene as a free radical scavenging agent, said stabilizing system synergistically increasing stability of said organic component while allowing the peroxygen component to retain most of its initial oxidation potential.
Claim 3
Dependent Claim
9 words
The composition of claim 1 further including a fragrance.
Claim 4
Dependent Claim
30 words
The composition of claim 1 further comprising a nonionic surfactant selected from the group consisting essentially of polyethoxylated alcohol, ethoxylated alkyl phenols, polyoxypropylene or polyoxyethylene block copolymers, and mixtures thereof.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein the substituted hydroxybenzene is a substituted hydroquinone.
Claim 6
Dependent Claim
12 words
The composition of claim 1 wherein the scavenging agent is butyl hydroxytoluene.
Claim 7
Dependent Claim
12 words
The composition of claim 4 wherein the substituted hydroquinone is mono-tert-butyl hydroquinone.
Claim 8
Dependent Claim
17 words
The composition of claim 1 wherein the peroxygen component is present in about 0.05-50 percent by weight.
Claim 9
Dependent Claim
16 words
The composition of claim 1 further including a buffer to maintain a pH of about 1-8.
Claim 10
Dependent Claim
21 words
The composition of claim 1 wherein the fluorescent whiteners are selected from fluorescent derivatives of stilbene and distyrylbiphenyls, and mixtures thereof.
Claim 11
Independent Claim
87 words
A method for stabilizing aqueous bleach formulations including hydrogen peroxide and an organic component selected from fluorescent whiteners, dyes and mixtures thereof, comprising admixing into said formulations a stabilizing system comprising 0.02-5.0 wt.% of an amino polyphosphonate as a chelating agent selected for chelating polyvalent heavy metal cations and an effective amount of a partially hindered substituted hydroxybenzene as a free radical scavenging agent, said stabilizing system synergistically increasing stability of said organic component while allowing the hydrogen peroxide to retain most of its initial oxidation potential.
Claim 12
Independent Claim
87 words
A method for stabilizing aqueous bleach formulations including hydrogen peroxide and an organic component selected from fluorescent whiteners, dyes and mixtures thereof, comprising admixing into said formulations a stabilizing system comprising 0.02-5.0 wt.% of an amino polyphosphonate as a chelating agent selected for chelating polyvalent heavy metal cations and an effective amount of a partially hindered substituted hydroxybenzene as a free radical scavenging agent, said stabilizing system synergistically increasing stability of said organic component while allowing the hydrogen peroxide to retain most of its initial oxidation potential.
Claim 13
Dependent Claim
19 words
The method of claim 10 wherein said partially hindered free radical scavenging agent is mono-tert-butyl hydroquinone or butyl hydroxytoluene.
References Cited (Backward Citations)
US3234140A
Cited
US3393153A
Cited
US3415608A
Cited
US3591341A
Cited
US3607053A
Cited
US3649194A
Cited
US3681022A
Cited
US4013404A
Cited
US3822114A
Cited
US3801512A
Cited
US3869401A
Cited
US3864271A
Cited
US4070442A
Cited
US3970575A
Cited
US3956159A
Cited
US4022703A
Cited
US4079015A
Cited
US3996152A
Cited
US4130501A
Cited
US4133869A
Cited
DE2918842A1
Cited
GB1598610A
Cited
US4239643A
Cited
US4238192A
Cited
US4510068A
Cited
US4497725A
Cited
US4525291A
Cited
US4347149A
Cited
US4320102A
Cited
US4430236A
Cited
EP0076166A2
Cited
US4362706A
Cited
US4470919A
Cited
US4478737A
Cited
US4448705A
Cited
EP0124341A2
Cited
EP0137669A1
Cited
US4623356A
Cited
US4772290A
Cited
US4764302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |