Claims
- 1. A process for producing microcapsules by
- a) adding to a suspension of a substance to be microencapsulated in a liquid a urea-, thiourea- or melamine-formaldehyde prepolymer or mixtures thereof, and
- b) curing said prepolymer to provide a crosslinked polymer enclosing the substance to be microencapsulated wherein the improvement comprises heat-curing the microcapsules thus obtained at a temperature of >100.degree. C.
- 2. A process according to claim 1 wherein the heat-curing takes place at a temperature of 150.degree.-220.degree. C.
- 3. A process according to claim 1 wherein the substance to be encapsulated is a rapidly leaching agrochemical.
- 4. A process according to claim 1 wherein the ratio of prepolymer to active ingredient is from 1:1 to 1:3.
- 5. A process according to claim 1 wherein the agrochemical is dicamba, 2,4-D or MCPA.
Parent Case Info
This is a continuation of application Ser. No. 07/907,884, filed Jul. 2, 1992, now abandoned, which is a continuation in part of application Ser. No. 07/675,847 filed on Mar. 27, 1991, now abandoned, and a continuation in part of application Ser. No. 07/663,195, filed on Feb. 21, 1991, now abandoned, which is a continuation of application Ser. No. 07/413,795 filed on Sep. 28, 1989, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0158449 |
Oct 1985 |
EPX |
0252897 |
Jan 1988 |
EPX |
0350553 |
Jan 1990 |
EPX |
2591857 |
Jun 1987 |
FRX |
3629714 |
Mar 1987 |
DEX |
Continuations (2)
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Number |
Date |
Country |
Parent |
907884 |
Jul 1992 |
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Parent |
413795 |
Sep 1989 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
675847 |
Mar 1991 |
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