Patent US4722838A successfully refreshed from Google Patents.
US4722838A
Expired / Lapsed
US
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Self-microencapsulating controlled release pesticide compositions
Assignee: EIDP Inc
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Filing: 1986-05-09
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Granted: 1988-02-02
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Expires: 2006-05-09
Abstract
Abstract This invention relates to a self-microencapsulating pesticidal composition consisting essentially of a solution of a polymeric barrier material in an organic solvent system, a dissolved or dispersed pesticidal agent and a surfactant.
Inventors
- 👤 Stan Tocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:01
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/26; A01N25/28; A01N25/08; A01N25/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
173 words
A self-microencapsulating pesticidal composition which when added to water with mild stirring will form particles of the pesticide encapsulated with a polymer, said composition consisting essentially of a solution of a polymeric barrier material dissolved in an organic solvent system, a dissolved or dispersed pesticidal agent and at least one surfactant, said composition having a Brookfield viscosity of less than 1500 cp at 20° C. wherein (1) the organic solvent system comprises one or more solvents with at least one organic solvent having a hydrogen bonding index of less than 5.7 and a rate of dissolution in water that permits the solution of the organic solvent and barrier material to form small immiscible droplets of the solution in the water before substantial dissolution of the solvent in the water occurs, (2) the polymeric barrier is completely soluble in the organic solvent system and provides good resistance to permeation by water and (3) at least one surfactant having a HLB that will permit the surfactant to provide rapid dispersion of the composition in water.
Claim 2
Dependent Claim
173 words
A self-microencapsulating pesticidal composition which when added to water with mild stirring will form particles of the pesticide encapsulated with a polymer, said composition consisting essentially of a solution of a polymeric barrier material dissolved in an organic solvent system, a dissolved or dispersed pesticidal agent and at least one surfactant, said composition having a Brookfield viscosity of less than 1500 cp at 20° C. wherein (1) the organic solvent system comprises one or more solvents with at least one organic solvent having a hydrogen bonding index of less than 5.7 and a rate of dissolution in water that permits the solution of the organic solvent and barrier material to form small immiscible droplets of the solution in the water before substantial dissolution of the solvent in the water occurs, (2) the polymeric barrier is completely soluble in the organic solvent system and provides good resistance to permeation by water and (3) at least one surfactant having a HLB that will permit the surfactant to provide rapid dispersion of the composition in water.
Claim 3
Dependent Claim
33 words
The composition of claim 1 which when dispersed in water with mild stirring will form less than 50 micron particles of the pesticide encapsulated with the polymeric barrier in less than one second.
Claim 4
Dependent Claim
14 words
The composition of claim 2 wherein the organic solvent system comprises one organic solvent.
Claim 5
Dependent Claim
11 words
The composition of claim 2 wherein the barrier polymer is polymethylmethacrylate.
Claim 6
Dependent Claim
12 words
The composition of claim 2 wherein the surfactant is polyoxyethylene sorbitan monooleate.
Claim 7
Dependent Claim
14 words
The composition of claim 1 wherein the organic solvent system comprises one organic solvent.
Claim 8
Dependent Claim
14 words
The composition of claim 6 where the organic solvent is completely soluble in water.
Claim 9
Dependent Claim
17 words
The composition of claim 6 wherein the surfactant or mixture of surfactants has an HLB of 10-17.
Claim 10
Dependent Claim
14 words
The composition of claim 6 wherein the organic solvent is ethyl acetate or cyclohexanone.
Claim 11
Dependent Claim
11 words
The composition of claim 6 wherein the barrier polymer is polymethylmethacrylate.
Claim 12
Dependent Claim
12 words
The composition of claim 6 wherein the surfactant is polyoxyethylene sorbitan monooleate.
Claim 13
Dependent Claim
13 words
The composition of claim 1 wherein the organic solvent system comprises two solvents.
Claim 14
Dependent Claim
36 words
The composition of claim 12 wherein one solvent is insoluble in water and constitutes no more than 50% by weight of the total solvent and one solvent has a hydrogen bonding index of less than 5.7.
Claim 15
Dependent Claim
17 words
The composition of claim 13 wherein the surfactant is a polyoxyethylene nonionic derivative or a mixture thereof.
Claim 16
Dependent Claim
17 words
The composition of claim 13 wherein the surfactant or mixture of surfactants has an HLB of 10-17.
Claim 17
Dependent Claim
11 words
The composition of claim 13 wherein the barrier polymer is polymethylmethacrylate.
Claim 18
Dependent Claim
13 words
The composition of claim 13 wherein the surfactant is a polyoxyethylene sorbitan monooleate.
References Cited (Backward Citations)
US3523906A
Cited
US3523907A
Cited
US3737337A
Cited
US4080191A
Cited
US3894149A
Cited
US4282209A
Cited
US4286020A
Cited
US4324781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |