# US 4,396,415 A · Herbicide

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- Number: US 4,396,415 A
- Document ID: US4396415A
- Status: Granted
- Kind: A
- Application number: 05/867,144
- Filed: 1978-01-05
- Granted: 1983-08-02
- Earliest claimed: 1975-10-27
- Assignees: BASF SE
- Inventors: Gotthard Synnatschke; Walter Gueckel
- Web page: https://patentgrep.com/patent/US4396415A

## CPC

- A01N 25/04: Dispersions, {emulsions, suspoemulsions, suspension concentrates} or gels (foams A01N25/16)
- A01N 25/30: characterised by the surfactants
- 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

## Abstract

Herbicide based on 1-phenyl-4-amino-5-chloro (or 5-bromo-)-pyridazone-(6) in the form of an aqueous suspension containing from 20 to 50 wt % of active ingredient, and silica and a block copolymer of propylene glycol, propylene oxide and ethylene oxide.

## Claims

### Claim 1

A herbicidal composition in the form of an aqueous suspension, comprising:
from 20 to 50% of 1-phenyl-4-amino-5-chloropyridazone-(6) or 1-phenyl-4-amino-5-bromopyridazone-(6) as active ingredient,
from 2 to 10 wt% of dispersant consisting essentially of condensate product of a phenolsulfonic acid, urea and formaldehyde and water, and
from 0.5 to 5%, respectively, of (a) silica and (b) a block copolymer of propylene glycol, propylene oxide and ethylene oxide, wherein said block copolymer is formed by reacting propylene glycol with propylene oxide to form a propylene oxide backbone and then reacting said propylene oxide backbone with ethylene oxide such that the molecular weight of the resulting block copolymer is about 6,000 to 7,000.

### Claim 2

A herbicidal composition in the form of an aqueous suspension, consisting essentially of:
from 20 to 50% of 1-phenyl-4-amino-5-chloropyridazone-(6) or 1-phenyl-4-amino-5-bromopyridazone-(6) as active ingredient,
from 2 to 10 wt% of dispersant consisting of the sodium salt of a condensate product of phenolsulfonic acid, urea and formaldehyde, and water, and
from 0.5 to 5%, respectively, of (a) silica and (b) a block copolymer of propylene glycol, propylene oxide and ethylene oxide, wherein said block copolymer is formed by reacting propylene glycol with propylene oxide to form a propylene oxide backbone and then reacting said propylene oxide backbone with ethylene oxide such that the block copolymer has a polypropylene oxide backbone of molecular weight 3,000 to 3,500 and contains about 50% by ethylene oxide units.

### Claim 3 (depends on 1)

A herbicidal composition as set forth in claim 1, wherein the silica is in artificial form.

### Claim 4 (depends on 1)

A herbicidal composition as set forth in claim 1, which also contains from 5 to 15 wt% of antifreeze.

### Claim 5 (depends on 1)

A herbicidal composition as set forth in claim 1, wherein said dispersant is the sodium salt of a condensation product of phenol-sulfonic acid, urea and formaldehyde.

### Claim 6 (depends on 1)

A process for controlling the growth of unwanted plants which comprises treating the plants or soil with an effective amount of a herbicidal composition according to claim 1.