Abstract: A tire puncture sealant is disclosed and described. Such a sealant may include a natural rubber latex and a surfactant, wherein a content of the surfactant is from 1.0 to 6.0 mass % of a solid content of the natural rubber latex and the surfactant includes a non-ionic surfactant and an anionic surfactant at a mass ratio where the non-ionic surfactant/the anionic surfactant=1.0/1.0 to 1.0/5.0.

Abstract: Provided is a plasma-resistant member which can be recycled and does not easily produce particles even when exposed to plasma. Specifically provided is a plasma-resistant member which has a predetermined surface profile and is used within a plasma etching chamber. The plasma-resistant member comprises: a first SiC layer (12) that is formed by a CVD method and has a corroded surface by having been exposed to plasma etching; and a second SiC layer (13) that is laminated on the corroded surface of the first SiC layer (12) by a CVD method and has a surface that is machined so as to have the predetermined surface profile.

Abstract: An object of the present invention is to provide a tire puncture sealant whereby both sealing performance and storage performance can be achieved. A tire puncture sealant is provided that includes a natural rubber latex, an antifreezing agent, and an acrylic emulsion. A mass ratio of a solid content of the natural rubber latex to a solid content of the acrylic emulsion (natural rubber/acrylic resin) is from 50/50 to 15/85. An amount of the antifreezing agent is from 100 to 300 parts by mass per 100 parts by mass of a total of the solid content of the natural rubber latex and the solid content of the acrylic emulsion. The total of the solid content of the natural rubber latex and the solid content of the acrylic emulsion is from 20 to 40 mass % of a total mass of the tire puncture sealant.

Abstract: A tire puncture sealant having both excellent sealing performance and excellent storage performance, specifically a tire puncture sealant containing a natural rubber latex (A) and a VEVA copolymer resin emulsion (B), wherein the solid content mass of the natural rubber latex (A)/solid content mass of the VEVA copolymer resin emulsion (B) is between 80/20 and 15/85.

Abstract: A tire puncture sealant including a rubber latex and/or a resin emulsion, and an acetylene alcohol and/or a derivative thereof.

Abstract: A tire puncture sealant is disclosed and described. Such a sealant may include a natural rubber latex and a surfactant, wherein a content of the surfactant is from 1.0 to 6.0 mass % of a solid content of the natural rubber latex and the surfactant includes a non-ionic surfactant and an anionic surfactant at a mass ratio where the non-ionic surfactant/the anionic surfactant=1.0/1.0 to 1.0/5.0.

Abstract: A tire puncture sealant having both excellent sealing performance and excellent storage performance, specifically a tire puncture sealant containing a natural rubber latex (A) and a VEVA copolymer resin emulsion (B), wherein the solid content mass of the natural rubber latex (A)/solid content mass of the VEVA copolymer resin emulsion (B) is between 80/20 and 15/85.

Abstract: Disclosed is a urethane emulsion which enables to obtain a cured product having excellent water repellency. This urethane emulsion is obtained by stirring a urethane prepolymer composition containing a urethane prepolymer having a carboxy group, a neutralizing agent and water. This urethane emulsion is characterized in that the urethane prepolymer is obtained by reacting, at a specific ratio, a polyisocyanate compound having two or more isocyanate groups, a siloxane-containing polyol compound having two or more hydroxy groups and dimethyl siloxane and/or a fluorine-containing polyol having two or more hydroxy groups and fluoroethylene, and a carboxy group-containing compound having two or more hydroxy groups and a carboxy group.

Abstract: Disclosed is a urethane emulsion exhibiting excellent stability, whose cured product is excellent in water resistance. Specifically disclosed is a urethane emulsion obtained by stirring a urethane prepolymer composition containing a carboxylated urethane prepolymer, water and a neutralizing agent at a shear rate of 5,000-19,000 s?1. The carboxylated urethane prepolymer is obtained by reacting a polyisocyanate compound having two or more isocyanate groups, a polyol compound having two or more hydroxy groups and a carboxylated compound having two or more hydroxy groups and one or more carboxy groups under such a condition that the molar ratio of the isocyanate group to the carboxy group is within the range of 12-200.

Abstract: A perovskite ceramic is prepared by separately preliminarily calcining raw material powders of two kinds of perovskite ceramic materials having mutually different compositions to form two kinds of perovskite ceramic materials having respective high dielectric constants and mutually different Curie temperatures, crushing and mixing the calcined materials at an adequate ratio, and sintering the mixed materials without forming a and change complete solid solution thereof. The two kinds of perovskite ceramic materials have the formula Pb(Fe.sub.2/3 W.sub.1/3).sub.x.sbsb.i (Fe.sub.1/2 Nb.sub.1/2).sub.1-x.sbsb.i O.sub.3, wherein in a first kind of perovskite ceramic material i=1 and 0.1.ltoreq.x.sub.1 .ltoreq.0.2, and in a second kind of ceramic perovskite material i=2 and 0.5.ltoreq.x.sub.2 .ltoreq.0.9, the two kinds of perovskite ceramic material coexisting in the mixing ratio 0.5.ltoreq.x.sub.2 /(x.sub.1 +x.sub.2).ltoreq.0.8.