US4259203A
Expired / Lapsed
US
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Particles based on polylactones derived from polyhydroxycarboxylic acids, and pulverulent compositions in which these particles are present
Assignee: Solvay SA
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Filing: 1979-04-20
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Granted: 1981-03-31
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Expires: 1999-04-20
Abstract
Abstract Particles of polylactones derived from polyhydroxycarboxylic acids. The particles contain a bicarbonate derived from an alkali metal or from ammonium, and are useful in pulverulent compositions for washing, cleaning and bleaching.
Inventors
- 👤 Robert Lorquet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:08
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
67 words
Particles capable of disaggregation in an aqueous medium, consisting essentially of polylactones which are intermolecular and intramolecular esters of hydroxycarboxylic acid polymers containing units of the formula ##STR2## in which R 1 and R 2 independently represent hydrogen or an alkyl group having 1 to 3 carbon atoms, and at least 1% by weight, relative to the polylactones, of a bicarbonate of an alkali metal or ammonium.
Claim 2
Dependent Claim
67 words
Particles capable of disaggregation in an aqueous medium, consisting essentially of polylactones which are intermolecular and intramolecular esters of hydroxycarboxylic acid polymers containing units of the formula ##STR2## in which R 1 and R 2 independently represent hydrogen or an alkyl group having 1 to 3 carbon atoms, and at least 1% by weight, relative to the polylactones, of a bicarbonate of an alkali metal or ammonium.
Claim 3
Dependent Claim
11 words
Particles according to claim 1 wherein said bicarbonate is sodium bicarbonate.
Claim 4
Dependent Claim
26 words
Particles according to claims 1 or 2 wherein said bicarbonate is present in an amount of between 3 and 20% by weight relative to the polylactones.
Claim 5
Dependent Claim
36 words
Particles according to claims 1 or 2 consisting essentially of a dry mixture of elementary particles of said polylactones and of said bicarbonate, said elementary particles having a mean diameter of between 2 and 50 microns.
Claim 6
Dependent Claim
19 words
Particles according to claims 1 or 2 wherein said particles have a mean diameter between 0.05 and 1.5 mm.
Claim 7
Dependent Claim
15 words
Particles according to claims 1 or 2 containing less than 10% by weight of water.
Claim 8
Dependent Claim
20 words
Particles according to claim 1 or 2, wherein said hydroxycarboxylic acid polymers consist exclusively of units of the formula ##STR3##
Claim 9
Dependent Claim
14 words
Particles according to claim 7 wherein the polylactones are esters of unsubstituted poly-α-hydroxyacrylic acid.
Claim 10
Dependent Claim
23 words
Particles according to claim 1 wherein said bicarbonate is present in an amount of up to 30% by weight relative to the polylactones.
Claim 11
Dependent Claim
84 words
A pulverulent composition for washing, cleaning and bleaching comprising 0.1 to 80% by weight of particles capable of disaggregation in an aqueous medium, consisting essentially of (1) polylactones which are intermolecular and intramolecular esters of hydroxycarboxylic acid polymers containing units of the formula ##STR4## in which R 1 and R 2 independently represent hydrogen or an alkyl group having 1 to 3 carbon atoms, and (2) at least 1% by weight, relative to the polylactones, of a bicarbonate of an alkali metal or ammonium.
Claim 12
Dependent Claim
84 words
A pulverulent composition for washing, cleaning and bleaching comprising 0.1 to 80% by weight of particles capable of disaggregation in an aqueous medium, consisting essentially of (1) polylactones which are intermolecular and intramolecular esters of hydroxycarboxylic acid polymers containing units of the formula ##STR4## in which R 1 and R 2 independently represent hydrogen or an alkyl group having 1 to 3 carbon atoms, and (2) at least 1% by weight, relative to the polylactones, of a bicarbonate of an alkali metal or ammonium.
Claim 13
Dependent Claim
20 words
A pulverulent composition according to claim 10 wherein said hydroxycarboxylic acid polymers consists exclusively of units of the formula ##STR5##
Claim 14
Dependent Claim
28 words
A pulverulent composition according to claim 11 wherein said bicarbonate is present in the particles in an amount of up to 30% by weight relative to the polylactones.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |