Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1994-03-22
1998-07-28
Lovering, Richard D.
Compositions
Inorganic luminescent compositions
Tungsten containing
522 81, 523203, 524409, 428405, B01D 1300, C08K 320
Patent
active
057858926
DESCRIPTION:
BRIEF SUMMARY
This application is filed under 35 U.S.C. 371 of PCT/JP92/00536, filed Apr. 24, 1992.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an organo-antimony oxide sol and a coating composition containing such a sol.
2. Prior Art
Antimony oxide particles are known to be flame-retarding, and antimony oxides having a pyrochlore structure are electrically conductive as reported for example in the Japan Chemical Journal, Vol. 4 (1983), page 488.
As a result of its high flame-retarding properties, the particulate antimony oxide has heretofore found extensive application as a useful ingredient for a coating applied to fabrics, plastics and the like. The antimony oxide should be after preferably in the form of a colloidal solution or sol for the preparation of either flame-retarding or electrically conductive coating formulations.
Amongst a number of prior art documents concerning antimony oxide sols, there may be cited Japanese Laid-Open Patent Publication No. 60-251129 in which a colloidal antimony oxide sol, a dispersoid, containing 0.5-25 percent by weight of antimony oxide and having a pH of the order of 2.5-12 is surface-reformed by an organo-silicon compound of the formula ##STR2## wherein R is and C.sub.1-8 substituent containing no amino group, mercapto group, methacryloxy group or halogen atom; R.sup.1 and R.sup.2 are each C.sub.1 -C.sub.4 hydrocarbon groups; and R.sup.3 is a C.sub.1 -C.sub.4 alkyl, alkoxy-substituted alkyl or acetyl group. Such antimony oxide hydrosol is well compatible with alcohol, ketone and other usual organic solvents. It is also compatible with normally liquid organic compounds such as for example vinyl monomers or oligomers for photo-setting resins (hereinafter referred to as photo-setting monomer or oligomer), provided that the antimony oxide dispersoid is surface-reformed by the use of relatively large quantities of the above organo-silicon compound. In the absence of insufficient organo-silicon compound, the antimony oxide sol would tend to undergo gellation upon blending with the vinyl monomer or oligomer. Attempts to use increased proportions of the organo-silicon compound for surface-reforming the dispersoid would result in loss of electric conductivity intrinsic of the antimony oxide.
Japanese Laid-Open Patent Publication No. 62-95130 discloses the use of a dispersant predominant of more than 80 mol % of monomers susceptible to hardening upon exposure to ultraviolet rays, electron rays, .gamma.-rays, X-rays and like optical energies, and the use of a dispersoid which is an organosol of silica, alumina or iron oxide, but fails to teach or suggest the use of an organosol of antimony oxide as the dispersoid.
As a matter of fact, the method taught by this prior art publication is infeasible for the production of an organosol comprising a photo-setting monomer dispersant and an antimony oxide dispersoid as contemplated by the present invention. The prior art method of Laid-Open '130 may be summarized to comprise admixing a starting material of silica or alumina hydrosol or alcohol with a photo-setting monomer and stripping off the water or alcohol in vacuum thereby replacing the sol dispersant with the photo-setting monomer.
Therefore, it is necessary to provide an organosol with an dispersant for a starting antimony oxide hydrosol or alcohol. To the best knowledge of the inventors, however, there has been introduced no such an organosol of antimony oxide which is homogeneously miscible with a photo-setting monomer. The only antimony oxide hydrosol miscible with the photo-setting monomer is one which may be available upon surface-reforming the antimony oxide with such large quantities of an organo-silicon compound that would sacrifice the electrically conductive properties of the antimony oxide per se.
DETAILED DESCRIPTION OF THE INVENTION
It is a primary object of the present invention to provide an organo-antimony oxide sol in which the antimony oxide is dispersed in an organic solvent highly compatible with a photo-setting monomer or oligome
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Komatsu Michio
Migita Teruo
Nishida Hiroyasu
Tanaka Yoshichika
Catalysts & Chemicals Industries Co. Ltd.
Lovering Richard D.
Metzmaier Daniel S.
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