Process for producing a solvent-less O/W type emulsion

Details Process for producing a solvent-less O/W type emulsion Process for producing a solvent-less O/W type emulsion

1998-06-01

2000-11-28

Alexander, Lyle A.

Colloid systems and wetting agents; subcombinations thereof; pro

Significant dispersive or manipulative operation or step in...

Phase inversion

516 30, 516 76, 516 25, 516 28, 516 75, 516 27, 514941, C09K 300, B01F 308, B01F 1700, A01N 6100

Patent

active

061536571

ABSTRACT:
An organic solvent-less O/W type emulsion having an excellent stability for storage and water-dilution is produced by a specific process in which (1) a mixture of (a) water with (b) an oily substance selected from oily effective materials and oily liquid materials, the oily substance and water being capable of forming an interface therebetween, (c) a high molecular weight surfactant and (d) a low molecular weight surfactant is stirred at a temperature of 40.degree. C. or less, to provide an O/W type emulsion; (2) the emulsion is heated to gel the emulsion; (3) the gel is heated to phase invert from O/W to W/O; (4) the W/O emulsion is cooled to a temperature below the gelling temperature; and (5) the resultant O/W emulsion is further stirred, and optionally in or after the cooling step (4), a particulate solid substance or an aqueous suspension thereof is mixed with the emulsion.

REFERENCES:
patent: 3909805 (1975-09-01), Toruon et al.
patent: 4230809 (1980-10-01), Heinrich et al.
patent: 4286020 (1981-08-01), Himel et al.
patent: 4309213 (1982-01-01), Graber et al.
patent: 4938797 (1990-07-01), Hasslin et al.
patent: 5074905 (1991-12-01), Frisch
patent: 5421876 (1995-06-01), Janoski
patent: 5759558 (1998-07-01), Epstein et al.

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