摘要:
Disclosed is a rust-preventive composition comprising (A) an aromatic compound i) containing a group selected from the group consisting of an —N═N— group, a >C═N— group, a >C═O group and an —N═O group and ii) having an absorption band in a visible region of from 530 nm to 750 nm; (B) a colloidal silica; (C) a film-forming polymeric compound containing in one molecule a group selected from the group consisting of an —OH group and a —COOH group; and (D) an organic solvent. This composition, having been coated on metal surfaces, provides a sufficient corrosion resistance without making any chromating treatment.
摘要翻译:公开了一种防锈组合物,其包含(A)含有选自-N = N-基,> C = N-基,a> C = O基和 - N = O基团,和ii)在530nm至750nm的可见光区域具有吸收带; (B)胶体二氧化硅; (C)在一分子中含有选自-OH基和-COOH基的基团的成膜性高分子化合物; 和(D)有机溶剂。 已经涂覆在金属表面上的这种组合物在不进行任何铬酸盐处理的情况下提供了足够的耐腐蚀性。
摘要:
An aluminum nitride composition including an aluminum nitride powder and an aromatic amine-based condensate is provided. In the composition, the aluminum nitride may hardly undergo decomposition even under severe conditions of high temperature and high humidity, and the electrical insulating properties and high thermal conductivity inherent in aluminum nitride powder can be maintained under such severe conditions. Accordingly, this composition is useful as a durable heat-dissipating composition, in particular, as a heat-dissipating coating material, grease or sheet.
摘要:
There is provided a polymer scale deposition preventive agent, comprising an alkaline solution of a condensation product having a molecular weight of 500 to 1,000,000 obtained by condensing a dimer compound of 2,3-dihydroxynaphthalene with formaldehyde. By polymerizing vinyl chloride or a monomer mixture containing vinyl chloride in a polymerization vessel wherein a coating film made of said polymer scale deposition preventive agent has been formed on the inner wall surface and the like, polymer scale is effectively prevented from depositing not only on an agitation apparatus but also on areas near the interface between a gas phase and a liquid phase, which prevention of the polymer scale deposition is conventionally difficult. Thus, a vinyl chloride polymer can be obtained which contains colored foreign matters, fish eyes, etc. in small amounts and is small in initial discoloration and is good in quality.
摘要:
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising an alkaline solution containing (A) a condensation product of (A-1) a hydroxynaphthalene compound and (A-2) an aldehyde compound, and (B) an inorganic colloid. This agent is used for forming a coating on the inner wall, etc. of a polymerization vessel. Such a vessel is effective in preventing polymer scale deposition, not only in the liquid-phase region but also in the vicinity of the interface between the gas and liquid phases in the vessel, and useful in producing a polymer that shows very few fish eyes and good whiteness when formed into sheets or the like.
摘要:
A polymer scale preventive process for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising an alkaline solution containing a condensation product of (A) an aromatic amine compound having at least two amino groups and (B) an aromatic tetracarboxylic acid anhydride. This process is used for forming a coating on the inner wall, etc. of a polymerization vessel. Such a vessel is effective in preventing polymer scale deposition and useful in producing a polymer that shows very few fish eyes and good whiteness when formed into sheets or the like.
摘要:
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising an alkaline solution containing a condensation product of (A) an aromatic compound having at least two amino groups and (B) an aromatic bis-ester anhydride. This agent is used for forming a coating on the inner wall, etc. of a polymerization vessel. Such a vessel is effective in preventing polymer scale deposition and useful in producing a polymer that shows very few fish eyes and good whiteness when formed into sheets or the like.
摘要:
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising a condensation product of (A) hydrazine and (B) a quinone compound. Where the monomer is polymerized in a polymerization vessel having, on its inner wall surface, a coating comprising the condensation product, deposition of polymer scale can be effectively prevented not only on the liquid phase part in the polymerization vessel but also near the interface between the gas phase part and the liquid phase part, so that the thus obtained polymer can provide a molded item having few fish eyes and low in initial coloration, when the polymer is molded into a sheet or the like.
摘要:
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising (A) a nitrogen-containing organic compound having at least five continuous conjugated .pi. bonds, (B) an anionic organic compound having at least one group selected from the group consisting of the sulfonic acid group and the carboxyl group and having at least five continuous conjugated .pi. bonds, and (C) a water-soluble basic polysaccharide. The agent is used for forming a coating on the inner wall, etc. of a polymerization vessel. Deposition of polymer scale can be effectively prevented not only in the liquid phase area but also in the vicinity of the interface between the gas and liquid phases. Products formed from polymer obtained have very few fish eyes.
摘要:
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising a pyrogallol-acetone resin. The agent is used for forming a coating on the inner wall, etc. of a polymerization vessel. Deposition of polymer scale can be effectively prevented, and polymeric product with high whiteness is obtained.
摘要:
A method of preventing polymer scale deposition in polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization vessel in which its inner wall surface has been previously coated with a coating solution comprising:(A) a condensate of a phenolic hydroxy group-containing compound,(B) at least one member selected from the group consisting of metal compounds and inorganic colloids, and(C) at least one member selected from the group consisting of dyes and pigments. This method makes it possible to prevent polymer scale deposition regardless of polymerization conditions such as the kind of monomers, the type of polymerization vessel, etc.