US4539144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dishwashing compositions with an anti-filming polymer
Assignee: Lever Brothers Co
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Filing: 1982-12-20
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Granted: 1985-09-03
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Expires: 2002-12-20
Abstract
Abstract The present invention pertains to a machine dishwashing or rinsing composition being substantially free from anionic synthetic detergents or fatty acid soaps, and having a very low or zero phosphate content, which comprises a nonionic detergent surfactant, a water-soluble calcium sequestering agent, a specific polymeric material and an alkaline detergent material, said composition having improved non-filming, non-spotting or non-streaking properties.
Inventors
- 👤 Johannes J. M. de Ridder
- 👤 Michael W. Hollingsworth
- 👤 Ian D. Robb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:09
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
A machine dishwashing or rinsing composition being substantially free from anionic detergents and having a very low or zero phosphate content, which comprises: (a) from 5.50% by weight of a calcium sequestering agent selected from the group consisting of water-soluble citrate salts, water nitrilotriacetic acid salts, water-soluble carboxymethyloxy succinic acids salt, zeolites, ethane-1,1-dihydroxyphosphonic acid salts, ethylenediamine tetraphosphonic acid salts and ethylenediamine tetraacetic acid salts; (b) from 0.05-5% by weight of hydrolyzed polymaleic anhydride having an average molecular weight of about 2,500; (c) up to 5% by weight of a nonionic detergent surfactant; and p1 (d) an alkaline detergent material selected from the group consisting of alkali metal hydroxides, alkali metal borates, alkali metal disilicates, alkali metal silicates having an alkali metal: SiO 2 ratio of 1:3.4, and alkali metal carbonates; the weight ratio between said sequestering agent and said hydrolyzed polymaleic anhydride being between 1:1 and 100:1.
Claim 2
Dependent Claim
147 words
A machine dishwashing or rinsing composition being substantially free from anionic detergents and having a very low or zero phosphate content, which comprises: (a) from 5.50% by weight of a calcium sequestering agent selected from the group consisting of water-soluble citrate salts, water nitrilotriacetic acid salts, water-soluble carboxymethyloxy succinic acids salt, zeolites, ethane-1,1-dihydroxyphosphonic acid salts, ethylenediamine tetraphosphonic acid salts and ethylenediamine tetraacetic acid salts; (b) from 0.05-5% by weight of hydrolyzed polymaleic anhydride having an average molecular weight of about 2,500; (c) up to 5% by weight of a nonionic detergent surfactant; and p1 (d) an alkaline detergent material selected from the group consisting of alkali metal hydroxides, alkali metal borates, alkali metal disilicates, alkali metal silicates having an alkali metal: SiO 2 ratio of 1:3.4, and alkali metal carbonates; the weight ratio between said sequestering agent and said hydrolyzed polymaleic anhydride being between 1:1 and 100:1.
Claim 3
Dependent Claim
42 words
A composition according to claim 1, comprising from 5 to 25% by weight of said sequestering agent; from 1-3% by weight of said hydrolyzed polymaleic anhydride; the weight ratio between said sequestering and said hydrolyzed polymaleic anhydride being between 1.5:1 and 10:1.
Claim 4
Dependent Claim
15 words
A composition according to claim 1, in which said alkaline detergent material is sodium metasilicate.
Claim 5
Dependent Claim
15 words
A composition according to claim 1 in which said calcium sequestering agent is sodium citrate.
References Cited (Backward Citations)
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |