Patent US4409201A successfully refreshed from Google Patents.
US4409201A
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Pressure-resistant microcapsules with a polyamide shell and a polyurethane-polyurea inner mass and process for their manufacture
Assignee: Hoechst AG
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Filing: 1981-05-29
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Granted: 1983-10-11
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Expires: 2001-05-29
Abstract
Abstract What are disclosed are pressure-resistant microcapsules comprising a polyamide shell having therein a structural mass of a polyurethane-polyurea polymer and an encapsulated water-immiscible liquid phase, and methods for making the same by dispersing a water-immiscible liquid phase in an aqueous phase and subsequently or simultaneously admixing therewith an aqueous solution of a diamine or polyamine, said dispersed phase comprising a polyamide forming acid compound, diisocyanate or polyisocyanate or a prepolymer thereof, and an inert organic aprotic hydrophilizing agent.
Inventors
- 👤 Rudolf Heinrich
- 👤 Heinz Frensch
- 👤 Konrad Albrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:10
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/26; A01N25/28; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
31 words
A pressure-resistant microcapsule comprising a single shell consisting essentially of a polyamide, a structured mass of a polyurethane-polyurea polymer occupying the volume within said shell, and an encapsulated water-immiscible liquid phase.
Claim 2
Dependent Claim
31 words
A pressure-resistant microcapsule comprising a single shell consisting essentially of a polyamide, a structured mass of a polyurethane-polyurea polymer occupying the volume within said shell, and an encapsulated water-immiscible liquid phase.
Claim 3
Dependent Claim
56 words
A pressure-resistant microcapsule as in claim 1 wherein the ratio by weight of polyamide forming said single shell to said polyurethane-polyurea polymer contained therein is from 10:1 to 1:10, and wherein the total amount of polymer in said shell and structured mass is 5 to 50 percent by weight of the total weight of the microcapsule.
Claim 4
Dependent Claim
27 words
A pressure-resistant microcapsule as in claim 2 wherein said total amount of polymer is 12 to 30 percent by weight of the total weight of the microcapsule.
Claim 5
Dependent Claim
16 words
A microcapsule as in claim 1 wherein said encapsulated liquid phase comprises a pesticidally active compound.
Claim 6
Dependent Claim
104 words
A method for making pressure-resistant microcapsules as in claim 1, which method comprises dispersing a water-immiscible phase liquid phase in an aqueous solution of a protective colloid, and simultaneously or subsequently admixing therewith an aqueous solution of a diamine or polyamine and of an acid binding agent, said water-immiscible liquid phase comprising a difunctional or polyfunctional acid derivative capable of polyamide formation with said diamine or polyamine, an inert organic aprotic hydrophilizing agent capable of dissolving water, and a member selected from the group consisting of diisocyanates and polyisocyanates, mixtures thereof with a compound containing hydroxyl groups, and prepolymers of a diisocyanate or polyisocyanate.
Claim 7
Dependent Claim
16 words
A method as in claim 5 performed at a temperature from 0° C. to 40° C.
Claim 8
Dependent Claim
24 words
A method as in claim 5 wherein said water-immiscible liquid-phase comprises 1 to 85 percent by weight of said inert organic aprotic hydrophilizing agent.
Claim 9
Dependent Claim
28 words
A method as in claim 5 wherein said inert organic aprotic hydrophilizing agent is a member selected from the group consisting of ketones, ethers, esters, and mixtures thereof.
Claim 10
Dependent Claim
22 words
A method as in claim 5 wherein said water-immiscible liquid phase comprises 20 to 70 percent by volume of the resulting dispersion.
Claim 11
Dependent Claim
23 words
A method as in claim 5 wherein said aqueous solution comprises from 0.5 to 10 percent by weight thereof of said protective colloid.
Claim 12
Dependent Claim
16 words
A method as in claim 5 wherein said water-immiscible liquid phase additionally comprises an active compound.
Claim 13
Dependent Claim
15 words
A method as in claim 11 wherein said active compound is a pesticidally active compound.
Claim 14
Dependent Claim
23 words
A method as in claim 11 wherein said active compound comprises from 0.1 to 80 percent by weight of said water-immiscible liquid phase.
Claim 15
Dependent Claim
17 words
A method as in claim 5 wherein said dispersing is effected in a zone of high turbulence.
Claim 16
Dependent Claim
26 words
A method as in claim 5 wherein said water-immiscible liquid phase is dispersed in the form of droplets have a diameter from 1 to 100 microns.
Claim 17
Dependent Claim
20 words
A method as in claim 5 wherein the microcapsules formed by the method are isolated by spray drying the dispersion.
Claim 18
Dependent Claim
15 words
A method as in claim 5 wherein said polyfunctional acid derivative is an acid halide.
Claim 19
Dependent Claim
14 words
A method as in claim 17 wherein said acid halide is an acid chloride.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |