Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Patent
1992-01-15
1994-10-18
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
106 2, C08G 7500
Patent
active
053570367
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an organic surface-treating agent and more specifically to an organic surface-treating agent which is useful as a surface-treating and dispersing agent for an inorganic material, in particular, an inorganic powder, to increase its dispersibility in a solvent.
2. Description of the Related Art
In general, since the surface of an inorganic material or powder is hydrophilic, its wettability and dispersibility with an organic solvent or a polymeric binder is poor. Therefore, in the production of paints, it has been the practice to modify the surface of the inorganic material or inorganic powder with a silane coupling agent (see Elements of Chemistry (Kagaku Sosetsu) No 44, "Surface Modification" edited by Japan Chemical Society (published by Gakkai Shuppan Center)).
In addition, dispersibility of the inorganic powder is important, in particular, in the production of a magnetic paint, since the recording density of a magnetic recording medium which is produced using the magnetic paint directly relates to the dispersibility.
In the field of magnetic paint, based on the basic idea that the dispersibility of magnetic powder or a filler can be improved by the use of a dispersant which has a hydrophilic or reactive functional group on at least one end of a lipophilic backbone of a molecule, the surface of such a powder is modified with a fatty acid or various surfactants as a surface-treating agent (cf. Japanese Patent Kokai Publication No. 102504/1983), or a silane coupling agent or a titanium coupling agent (cf. Japanese Patent Kokai Publication Nos. 125539/1980 and 58135/1981).
As suitable organic solvents in which an organic material is dissolved, toluene, MEK, ethyl acetate, THF and the like are known. Ethyl acetate contains an ester group, THF contains an ether group, MEK contains a ketone group, and toluene contains a phenyl group.
Since the conventional fatty acid or silane coupling agent does not contain the ester, ether or phenyl group in its backbone, it has poor compatibility with these organic solvents.
In addition, since such a fatty acid or silane coupling agent has a very small average molecular weight, it cannot increase the distance between particles of the organic powder. Therefore, the once dispersed organic powder particles recoagulate.
Such a fatty acid or silane coupling agent is insufficient for dispersing the organic powder stably in the presence of the organic solvent.
It has been tried to increase the dispersing capability of the polymeric binder for the inorganic powder by incorporating a hydrophilic or reactive functional group such as a sulfonic acid group, a phosphoric acid group, a carboxylic acid group or their salts, or a tertiary amino group in the molecular chain of the binder (Japanese Patent Kokai Publication Nos. 13520/1981, 117734/1980 and 13223/1989). However, such polymeric binders do not have sufficient dispersing capability, and it is necessary to provide a new surface treating technique in order to increase dispersibility.
SUMMARY OF THE INVENTION
The present invention intends to solve the drawbacks of the above conventional surface treating techniques and to provide an organic surface-treating agent which can have a good surface-treating effect, in a very small amount, because it has a molecular size sufficient for separating inorganic powder particles and, a hydrophilic or reactive functional group at molecular chain ends, so as to exert most effectively the function of the hydrophilic or reactive functional group.
As a result of extensive study by the present inventors on the increase of the surface-treating effect, it has been found that an organic surface-treating agent which shows a significant increase in surface treating effect on an inorganic material, in particular, an inorganic powder, can be obtained, first, by the introduction of a hydrophilic or reactive functional group, such as a sulfonic acid group, a phosphoric acid group, a carboxylic acid group or their salts or
REFERENCES:
patent: 3005803 (1961-10-01), Holtschmidt et al.
patent: 4745175 (1988-05-01), Scholl et al.
Harada Tomohiro
Miyata Kazushi
Saibara Shoji
Hitachi Maxell Ltd.
Kight III John
Mosley T.
LandOfFree
Organic surface-treating agent does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Organic surface-treating agent, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Organic surface-treating agent will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2373858