# US 5,707,551 A · Nonaqueous suspension concentrates of highly water-soluble solids

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- Number: US 5,707,551 A
- Document ID: US5707551A
- Status: Granted
- Kind: A
- Application number: 08/362,057
- Filed: 1994-12-22
- Granted: 1998-01-13
- Earliest claimed: 1994-12-22
- Assignees: Rhone-Poulenc Inc.
- Inventors: Norman Robert Pallas; James Lyle Hazen; Robert Jene Riedemann
- Web page: https://patentgrep.com/patent/US5707551A

## CPC

- B01J 13/00: Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- A01N 25/04: Dispersions, {emulsions, suspoemulsions, suspension concentrates} or gels (foams A01N25/16)
- C09K 23/017: {Mixtures of compounds}
- Y10S 516/03: Organic sulfoxy compound containing
- Y10T 137/0391: Affecting flow by the addition of material or energy
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The nonaqueous suspension concentrate of claim 1 wherein:
i) the nonionic polymeric viscosity improver is selected from the group consisting of
a) polyacrylic acids and the sodium salts thereof;
b) polyalkylene oxide block copolymers; and
c) mixtures thereof;
ii) the anionic surfactant is selected from the group consisting of
a) alkyl or alkyl ether sulfates of the formulae R--O--SO.sub.3 --M or R--O--(C.sub.2 H.sub.4 O).sub.x --SO.sub.3 --M respectively wherein R is an alkyl, alkenyl or alkylaryl group of about 8 to about 22 carbon atoms, x is 1 to 10, and M is a water-soluble cation;
b) water-soluble salts of the formula R.sub.1 --SO.sub.3 --M wherein R.sub.1 is selected from the group consisting of
1) a straight or branched chain, saturated aliphatic hydrocarbon radical having from 8 to 24 carbon atoms;
2) a mono-, di-, or tri- C.sub.1 -C.sub.6 alkyl substituted aryl wherein the aryl is a phenyl or naphthyl group;
3) alpha-olefins having 12 to 24 carbon atoms; and
4) naphthalene-formaldehyde condensation products;
c) isethionates;
d) n-methyl taurates;
e) sulfosuccinates;
f) sulfosuccinamates;
g) B-alkyloxy alkane sulfonates;
h) disulfonates; and
i) mixtures thereof; and
iii) the bulky nonionic surfactant comprises at least one poly-oxy ethylenated and/or -oxy propylenated poly (1-phenyl ethyl) phenol or phenyl ester of the formula: ##STR6## wherein: m is 2 or 3;
(OX) is a recurring oxy ethylenated and/or oxy propylenated unit;
n is from 12 to 35;
and R.sub.7 is a hydrogen, phosphate or sulfate entity.

### Claim 3 (depends on 1)

The nonaqueous suspension concentrate of claim 1 wherein the water-miscible, organic liquid carrier is selected from the group consisting of C.sub.1 -C.sub.4 alkanols; C.sub.1 -C.sub.4 alkadiols; and mixtures thereof.

### Claim 4 (depends on 3)

The nonaqueous suspension concentrate of claim 3 wherein the carrier is diethylene glycol.

### Claim 5

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.