摘要:
A primer comprising at least one selected from the group consisting of dyes and pigments, and, optionally, at least one selected from the group consisting of an organosilicon compound represented by Formula (I): ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon group; R.sup.2 represents a substituted or unsubstituted monovalent hydrocarbon group; R.sup.3 represents X-- or X-R.sup.4 --, where X represents a monovalent hydrocarbon group containing an epoxy group, etc., and R.sup.4 represents a saturated divalent hydrocarbon group; and n is an integer of 0 to 2,and a partial hydrolyzate thereof. This primer can import a good adhesion to so-called hardly adherable materials such as polyolefin plastics.
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.
摘要:
The invention provides an efficient method for preventing polymer scale deposition on the reactor walls in the suspension or emulsion polymerization of an ethylenically unsaturated monomer, e.g. vinyl chloride and styrene, by coating the reactor walls, prior to introduction of the polymerization mixture, with an aqueous coating solution containing (a) a silicic acid compound, e.g. colloidal silicic acid, and (b) a phosphorous compound, e.g. phytic acid and polyphosphoric acid, in a specified weight proportion followed by drying.
摘要:
The invention provides a novel method for preventing deposition of polymer scale on the walls of a polymerization reactor in the course of polymerization of various ethylenically unsaturated monomers such as the suspension polymerization of vinyl chloride in an aqueous medium. The method comprises coating the reactor walls with a coating solution containing (a) a polymeric compound having hydroxyl groups such as a polyvinyl alcohol and (b) a silicic acid compound such as water glass followed by drying of the coated surface and washing thereof with water.
摘要:
The invention provides a very efficient method with highly durable effect for preventing polymer scale deposition on the reactor walls and other surfaces coming into contact with the monomer during polymerization of an ethylenically unsaturated polymerizable monomer in an aqueous medium such as in the suspension polymerization of vinyl chloride. The method comprises coating the reactor walls, prior to polymerization, with a novel coating material which is a condensation product obtained by the condensation reaction of an aromatic amine compound such as aniline and an aromatic nitro compound such as nitrobenzene in the presence of a mineral acid and a specified condensation catalyst. It is sometimes preferable that the condensation product is basified or treated with an alkali or ammonium compound to be imparted with a modified solubility behavior.
摘要:
The invention provides a novel method for preventing polymer scale deposition on the reactor walls in the polymerization of vinyl chloride, vinylidene chloride, styrene and other ethylenically unsaturated monomers in an aqueous medium. The inventive method comprises coating the reactor walls, piror to polymerization, with an aqueous coating solution containing a water-soluble ionic polymer and a water-soluble ionic dye having counteractive polarity to the polarity of the water-soluble ionic polymer compound. In other words, a water-soluble anionic dye is used as combined with a water-soluble cationic polymer and a water-soluble cationic dye is used as combined with a water-soluble anionic polymer compound. The scale preventing effect obtained with the combined use of the above two components can be further increased when the aqueous coating solution is admixed with a monovalent alcohol having from 3 to 6 carbon atoms in a molecule owing to the improved spreading of the aqueous solution on the metal surface of the reactor walls. The effect of the method is so remarkable and reliable that polymerization of styrene and other monomers can be performed in a stainless steel polymerization reactor, said polymerization being hitherto conducted in a glass-lined reactor due to the lack of an efficient method for preventing polymer scale deposition on the stainless steel surfaces.
摘要:
This process is a method of preventing polymer scale formation in a polymerization vessel during the polymerization of a monomer having an ethylenically unsaturated double bond. The inner wall surface of a polymerization vessel is coated with a water-based coating solution containing (a) a water-soluble anionic dye and (b) at least water-insoluble cationic dye or water-insoluble nitrogen-containing organic compound, where the water-based coating solution has a pH of 7 or less. The coating solution is applied and then dried to form a coating.
摘要:
A method of preventing polymer scale deposition in a polymerization vessel during polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization vessel of which the inner wall has been previously first coated with(A) a coating solution comprising a condensate of an aromatic compound and at least one member selected from the group consisting of metal compounds and inorganic colloids, and the coating thus formed has been then coated with(B) a coating solution comprising at least one member selected from the group consisting of anionic polymeric compounds, amphoteric polymeric compounds and hydroxyl group-containing polymeric compounds; and a polymerization vessel having a coating thus formed. According this method, polymer scale deposition on the inner wall, etc. of the polymerization vessel can be effectively prevented.
摘要:
A method of preventing polymer scale deposition in a polymerization vessel during polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization of which the inner wall has been previously coated with a coating solution comprising:(A) an aromatic amine-based condensate,(B) at least one member selected from the group consisting of alkali metal salts and ammonium salts of a sulfonation product prepared by sulfonation of an aromatic amine-based condensate, and(C) at least one member selected from the group consisting of metal compounds, inorganic colloids, dyes and pigments; a scale preventive agent comprising the components (A), (B) and (C); and a polymerization vessel having a coating comprising the scale preventive agent. According the method, polymer scale deposition on the inner wall, etc. of the polymerization vessel can be effectively prevented.
摘要:
A process for production of a vinyl polymer by suspension polymerization or emulsion polymerization of at least one kind of vinyl monomer in an aqueous medium is disclosed.In this process, the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization having a surface roughness of not greater than 5 .mu.m and being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated .pi. bonds. According to this process, scaling on the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.