Agitating – Method
Reexamination Certificate
1999-10-12
2001-05-29
Soohoo, Tony G. (Department: 1723)
Agitating
Method
C366S304000
Reexamination Certificate
active
06238082
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for producing an aqueous dispersion of a polymer substance, and more particularly to a process for producing an aqueous dispersion of a polymer substance, which process enables production of the dispersion in a large amount within a short time, the dispersion having the following characteristics: a narrow distribution of particle size and concentration of the substance; ability to form a protective colloid in a consistent manner; and a variety of applications including imparting water-repellence, anticorrosiveness, and adhesiveness.
2. Background Art
A conventionally known process for producing an aqueous dispersion composition is disclosed in Japanese Patent Application Laid-Open (kokai) No. 304876/1995. In this process, a raw material and a dispersant are placed in a pre-heated kneading apparatus, and the raw material and the dispersant are kneaded by application of shearing force and heated to 160° C. (the softening point of the raw material) or more. Subsequently, after softening and mixing of the raw material is completed, water is added to the resultant mixture, to thereby produce an aqueous dispersion having a predetermined concentration. In this process, asphalt is used as a raw material and partially-saponified poval is used as a dispersant, and poval is allowed to stand six hours or more in advance and is swollen with water to assume the form of sponge block.
However, in the above-described process, raw materials which may be used are limited to substances having a softening point of 160° C. or less. Use of a substance having a softening point of 160° C. or more as a raw material requires a sophisticated kneading apparatus which can effect heating and pressurizing simultaneously, and such an apparatus may contribute to high equipment cost.
Meanwhile, six hours or more are required for swelling partially-saponified poval with water into the form of sponge block, to thereby disadvantageously require a long time for producing a dispersion. In addition, completion of an aqueous dispersion requires about 60 minutes after a raw material is placed into a kneading apparatus, and producing the dispersion in a short time is fundamentally difficult.
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the present invention is to provide a process for producing an aqueous dispersion of a polymer substance, which may provide downsized production equipment so as to save space, and reduce equipment cost.
Another object of the present invention is to provide a process for producing an aqueous dispersion of a polymer substance capable of producing the dispersion in a great amount in a short time, wherein the dispersion provides low variance in particle size and concentration of the substance and the dispersion has stability in forming a protective colloid.
REFERENCES:
patent: 4263193 (1981-04-01), Sakimoto et al.
patent: 4361414 (1982-11-01), Nemes et al.
patent: 4610548 (1986-09-01), Hallet et al.
patent: 4748219 (1988-05-01), Gordini
patent: 4915509 (1990-04-01), Sauer et al.
patent: 4917546 (1990-04-01), Bulicz
patent: 5622650 (1997-04-01), Rourke
patent: 5869567 (1999-02-01), Fujita et al.
patent: 51-111848 (1976-10-01), None
patent: 52-33982 (1977-03-01), None
patent: 7-304876 (1995-11-01), None
Carter, Ledyard & Milburn
Soohoo Tony G.
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