Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-06-03
1999-09-14
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253273, 5253274, 5253297, 42840224, 428407, C08F 800
Patent
active
059524294
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to a carbon black graft polymer, a method for the production thereof, and a use thereof. More particularly, this invention relates to a carbon black graft polymer which exhibits excellent stability of dispersion to various media. This invention also relates to a carbon black graft polymer which, when added to a varying medium, can manifest fully satisfactorily such qualities as coloring property, imperviousness to light, sensitivity to light, developability with an alkali, and insulation. This invention further relates to a carbon black graft polymer which can be used advantageously in a black light-curing resin composition such as, for example, the black matrix-forming material in the color filter.
This invention further relates to a method for the treatment for surface modification of minute solid particles such as pigments represented by carbon black, magnetic powder, and ceramic powder to improve the minute solid particles in dispersibility in various media such as water, organic solvents, or organic macromolecular compounds, and particularly to a method for the treatment for surface modification which allows a wide range for the selection of the polymer component to be used in the surface modification and implements the surface modification thoroughly by the use of the polymer component in a relatively small amount.
2. Prior Art
The minute solid particles such as pigments represented by carbon black, magnetic powder, and ceramic powder are used more often as incorporated in various compositions in various applications for the purpose of imparting thereto such functions as coloration, reinforcement, and filling than they are used alone in their unmodified form.
Most of these minute solid particles, particularly such minute solid particles as have a primary particle diameter of the order short of submicrons, exhibit weak affinity for other substances such as, for example, water, organic solvents, and organic macromolecular compounds as compared with the cohesive force generated among their individual particles and, therefore, tend to succumb to secondary cohesion. When the minute solid particles are expected to acquire excellent properties in such various compositions as mentioned above, therefore, how uniformly they are dispersed in a given composition poses itself a problem. For the solution of this problem, numerous methods for attaining uniform incorporation or dispersion of minute solid particles in a solid or liquid medium by coating the surface of minute solid particles with a varying surfactant or resin thereby heightening the affinity thereof for the medium have been under study.
As concerns carbon black, for example, (1) the carbon black graft polymer which is obtained by polymerizing a polymerizable monomer in the presence of carbon black has been attracting attention because the hydrophilicity and/or oleophilicity thereof can be suitably varied by appropriately selecting the kind of the polymerizable monomer (JP-B-42-22,047, JP-B-44-3,826, JP-B-45-17,248, and U.S. Pat. No. 3,557,040).
Then, (2) the carbon black graft polymer which is obtained by the reaction of a polymer containing a reactive group such as epoxy group or aziridine group in the molecular unit thereof with carbon black has been proposed (JP-B-02-24,868 and JP-B-06-27,269).
The method (1) mentioned above, however, produces the carbon black graft polymer with a low yield ranging from several % to ten-odds %. The greater part of the polymerization product exists in the form of a vinyl type homopolymer. The efficiency with which the carbon black graft polymer provides a required surface treatment for carbon black, therefore, is extremely low. The product of this method, therefore, does not manifest such high affinity for other substances as is expected and frequently assumes such a dispersed state as is variable with the condition of incorporation or dispersion.
The carbon black graft polymer (2) mentioned above is found to manifest fairly improved dispersibili
REFERENCES:
patent: 4910113 (1990-03-01), Mori et al.
Anan Kazuhiro
Ando Nobuyuki
Asako Yoshinobu
Ikeda Hayato
Kushino Mitsuo
Lipman Bernard
Nippon Shokubai Co. , Ltd.
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