Abstract: An object of the present invention is to provide a metal pigment composition having the characteristics that aging stability is excellent, reductions of brightness, masking and flip flop appearance are little, and storage stability is excellent. The present invention is directed to a metal pigment composition containing a metal pigment treated with at least one of organic molybdenum compounds, or a metal pigment composition containing a metal pigment treated with at least one of organic molybdenum compounds, and at least one agent selected from the groups consisting of an anti-oxidizing agent, an anti-reducing agent and a photostabilizer.

Abstract: Disclosed is a resin-coated metal pigment comprising 100 parts by weight of a metal pigment and 0.1 to 50 parts by weight of a resin, wherein the resin is attached on the surface of the metal pigment. The resin-coated metal pigment is produced by circulating a portion of a slurry solution containing the metal pigment in an external-circulation type vessel during the resin coating treatment in a reaction vessel and applying a vibration to the external-circulation type vessel with an ultrasonic wave.

Abstract: Disclosed is a process for producing a resin-coated metal pigment comprising 100 parts by weight of a metal pigment and 0.1 to 50 parts by weight of a resin, wherein the resin is attached on the surface of the metal pigment, the process comprising applying an ultrasonic vibration during resin coating treatment.

Abstract: Disclosed is a process for producing a resin-coated metal pigment comprising 100 parts by weight of a metal pigment and 0.1 to 50 parts by weight of a resin, wherein the resin is attached on the surface of the metal pigment, the process comprising applying an ultrasonic vibration during resin coating treatment.

Abstract: Disclosed is a resin-coated metal pigment comprising 100 parts by weight of a metal pigment and 0.1 to 50 parts by weight of a resin, wherein the resin is attached on the surface of the metal pigment. The resin-coated metal pigment is produced by circulating a portion of a slurry solution containing the metal pigment in an external-circulation type vessel during the resin coating treatment in a reaction vessel and applying a vibration to the external-circulation type vessel with an ultrasonic wave.

Abstract: Disclosed is a metal pigment composition which can be used in an aqueous coating and shows excellent storage stability of a coating agent, and which is reduced in the deterioration of glossiness, hiding power, flip-flop property and the like when formed into a coating film. Specifically disclosed is a metal pigment composition which is treated with at least one amine salt of a heteropoly acid. The heteroatom constituting the heteropoly acid is at least one element selected from the elements belonging to Groups III, IV and V. The polyatom constituting the heteropoly acid is a transition metal. The amount of the amine salt of the heteropoly acid is preferably 0.01 to 10 parts by weight relative to 100 parts by weight of a metal pigment. The metal pigment is preferably an aluminum flake.

Abstract: Disclosed is a metal pigment composition which can be used in an aqueous coating and shows excellent storage stability of a coating agent, and which is reduced in the deterioration of glossiness, hiding power, flip-flop property and the like when formed into a coating film. Specifically disclosed is a metal pigment composition which is treated with at least one amine salt of a heteropoly acid. The heteroatom constituting the heteropoly acid is at least one element selected from the elements belonging to Groups III, IV and V. The polyatom constituting the heteropoly acid is a transition metal. The amount of the amine salt of the heteropoly acid is preferably 0.01 to 10 parts by weight relative to 100 parts by weight of a metal pigment. The metal pigment is preferably an aluminum flake.

Abstract: An object of the present invention is to provide a metal pigment composition having the characteristics that aging stability is excellent, reductions of brightness, masking and flip flop appearance are little, and storage stability is excellent. The present invention is directed to a metal pigment composition containing a metal pigment treated with at least one of organic molybdenum compounds, or a metal pigment composition containing a metal pigment treated with at least one of organic molybdenum compounds, and at least one agent selected from the groups consisting of an anti-oxidizing agent, an anti-reducing agent and a photostabilizer.

Abstract: An aluminum pigment composition comprising flaky aluminum, wherein said flaky aluminum as a base material is coated with a coating layer comprising hydrolyzates (a) of a titanium alcoholate represented by the general formula (1):

Abstract: The present invention relates to a multicore plastic optical fiber for light signal transmission comprising 7 or more cores having a diameter of 50 to 200 .mu.m which are covered with a cladding resin having a refractive index lower than that of the core resin by 0.005 to 0.04. The multicore plastic optical fiber of the present invention has low transmission loss in a broad transmission bandwidth and exhibits excellent bending characteristics. Therefore, it is suitable for transmission at a high speed in short and medium distances.

Abstract: A cladding material for plastic optical fiber comprising a vinylidene fluoride-trifluoroethylene-hexafluoroacetone copolymer which comprises 3.5 to 6.5% by mole of hexafluoroacetone units, a molar ratio of vinylidene fluoride unit to trifluoroethylene unit of 3 to 6:1, and a melt index of 10 to 60 g/10 min, and a plastic optical fiber comprising said cladding material and a methyl methacrylate homopolymer or copolymer which comprises over 50% by weight of methyl methacrylate units as the core material.