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US 5,707,551 AGranted
Nonaqueous suspension concentrates of highly water-soluble solids
AssigneeRhone-Poulenc Inc.
InventorsNorman Robert Pallas, James Lyle Hazen, Robert Jene Riedemann
Life of this patent
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Abstract
Stable, concentrated nonaqueous suspensions of water-soluble solids are prepared by using water-miscible organic liquid carriers, preferably lower alkadiols in conjunction with a specific three component surfactant system, i.e., a system comprising a nonionic polymeric viscosity improver surfactant; an anionic surfactant; and a nonionic surfactant having a bulky hydrophobic substituent group.
Claims5
A nonaqueous suspension concentrate comprising:
- a) from 40 to 85 weight percent of a compound having a solubility in water of greater than one percent based on the weight of said compound and water at 24.degree. C., the particles of which in said concentrate having a volume average diameter of from 0.5 microns to 500 microns;
- b) from 11 to 58 weight percent of a water miscible, organic liquid carrier;
- c) from 4 to 15 weight percent of a surfactant system comprising:
- i) from 2 to 7 weight percent of a nonionic polymeric viscosity improver;
- ii) from 1 to 7 weight percent of an anionic surfactant;
- and
- iii) from 1 to 7 weight percent of a bulky nonionic surfactant of the formula R.sub.6 --O--(C.sub.n H.sub.2n O).sub.z --R.sub.7 wherein R.sub.6 is selected from the group consisting of a phenyl;
- a mono-, di- or tri-substituted phenyl;
- a phenyl C.sub.1 -C.sub.6 alkyl;
- and a mono-, di-, or tri-substituted phenyl C.sub.1 -C.sub.6 alkyl wherein the phenyl substituent group(s) each have a total of 1 to 30 carbon atoms, and wherein each substitution can be a saturated or unsaturated straight or branched carbon chain, a phenyl, an alkyl phenyl, a phenyl alkyl, or an alkyl phenyl alkyl group;
- wherein n is from 2 to 4 and may be the same or different for each alkylene oxide unit;
- wherein R.sub.7 is a hydrogen, phosphate or sulfate entity;
- and wherein x is from 2 to 100;
- and
- d) from 0 to 30 weight percent water;
- with the proviso that the suspension concentrate properties at 24.degree. C. are within the stabilization zone limitations of:
- 1) an initial Brookfield viscosity of from 100 to 30,000 cps;
- 2) a Heliopath viscosity of less than 400,000 cps at two weeks after initial preparation and two inches below the surface of the concentrate;
- 3) a Bostwick Consistometer 10 cm time equal to or less than one minute;
- and
- 4) syneresis at 24 hours of less than 30% with less than 5% after thirty inversions;
- all of the above weight percents being based on the total weight of the concentrate except where indicated.
19 more elements
A nonaqueous suspension concentrate comprising:
- a) from 40 to 85 weight percent of a compound having a solubility in water of greater than one percent based on the weight of said compound and water at 24.degree. C., the particles of which in said concentrate having a volume average diameter of from 0.5 microns to 500 microns;
- b) from 11 to 58 weight percent of a water miscible, organic liquid carrier;
- c) from 4 to 15 weight percent of a surfactant system comprising:
- i) from 2 to 7 weight percent of an ethoxylated-propoxylated block copolymer;
- ii) from 1 to 7 weight percent of disodium dodecyl diphenyloxide disulfonate;
- and
- iii) from 1 to 7 weight percent of tristyrylphenol (16) ethoxylate;
- and
- d) from 0 to 30 weight percent water;
- with the proviso that the suspension concentrate properties at 24.degree. C. are within the stabilization zone limitations of:
- 1) an initial Brookfield viscosity of from 100 to 30,000 cps;
- 2) a Heliopath viscosity of less than 400,000 cps at two weeks after initial preparation and two inches below the surface of the concentrate;
- 3) a Bostwick Consistometer 10 cm time equal to or less than one minute;
- and
- 4) syneresis at 24 hours of less than 30% with less than 5% after thirty inversions;
- all of the above weight percents being based on the total weight of the concentrate except where indicated.
13 more elements
Dependencies are inferred from the claim text.