摘要:
A method of preventing polymer scale deposition in a polymerization vessel in polymerization of a particular monomer having an ethylenic double bond having a high dissolving power against the conventional scale preventive coatings, wherein said polymerization is carried out in a polymerization vessel of which the inner wall has been previously coated with a first coating liquid comprising:(A) a water-soluble anionic dye, and(B) a metal salt, to form a first coating, and the first coating thus formed has been then coated with a second coating liquid comprising:(C) an alkaline earth metal compound, and at least one member selected from the group consisting of:(D) a water-soluble anionic dye and(E) an inorganic colloid,to form a second coating. Polymer scale deposition can be effectively prevented.
摘要:
A method of preventing polymer scale deposition during polymerization of a monomer having an ethylenically double bond in a polymerization vessel, comprising the step of carrying out said polymerization in a polymerization vessel of which the inner wall surface has a coating comprising:(A) a polyvinyl alcohol, and(B) a water-soluble polymeric compound having a carboxyl group which may be in the form of a salt, and a polymer scale preventive agent comprising said (A) and (B). Deposition of polymer scale can be effectively prevented. Since the components (A) and (B) have no poisonousness, safety of operators are ensured.
摘要:
This invention relates to a composite molded article where a polymer film of superior weather resistance, adhesion and surface smoothness is made into an integral composite body on the surface of polynorbornene base material by utilizing reaction injection molding in combination with an in-mold coating process. By means of this invention, it is possible to manufacture three dimensional composite molded articles, composite molded articles of complex shapes and deep-drawn composite molded articles. The composite molded articles of this invention can be used for a variety of purposes, such as automobile parts, electrical parts, construction, etc.
摘要:
A mesh screen of polyester filaments for screen printing is subjected to a treatment with low temperature plasma in an atmosphere of a non-oxidizing inorganic gas to such an extent that a crosslinked layer having a thickness of 0.001 to 0.1 .mu.m is formed on the surface of the polyester filaments and the surface of the filaments is provided with protrusions and concavities having a diameter of 0.01 to 0.1 .mu.m in a distribution density of 1000 to 6000 per .mu.m.sup.2 of the surface area of the filament. The thus treated mesh screen is advantageously improved, with no adverse influences on the mechanical strength, in respect of the adhesion between the filament surface and a photosensitive resin composition applied to the mesh screen for photolithographic patterning. The plasmatreated mesh screen is also advantageous in respect of the decreased resistance against transfer of a printing ink through open meshes.
摘要:
The resin-impregnated composite prepreg based on a fabric material of an aromatic polyamide fiber is prepared by exposing the fabric material to low temperature plasma generated in an atmosphere of an inorganic gas, which is preferably oxygen or an oxygen-containing gaseous mixture, under a pressure of 0.5 to 5 Torr to such an extent that ruggedness of 0.01 to 0.5 .mu.m is formed on the surface and then impregnating the fabric material with an organic resinous binder. The adhesive bonding strength between the binder and the fiber surface can further be increased when the plasma-treated fabric material is brought into contact with an unsaturated compound polymerizable by free radical polymerization without contacting with air so as to form a graft-polymerized layer on the fiber surface.
摘要:
A continuous vacuum treating apparatus having a vacuum treating chamber for continuously treating the surface of a plastic molding under a vacuum, and at least one auxiliary vacuum chamber disposed at each of the upstream and downstream sides of the vacuum treating chamber. Each auxiliary vacuum treating chamber includes a pair of seal rolls contacting each other, means for effecting seals between the seal rolls and cases over the entire axial lengths of the rolls, and means for effecting seals between both end surfaces and the cases.
摘要:
The invention provides a novel method for providing the surface of various kinds of substrate articles, e.g. sapphire, quartz, alumina, metals, glass, plastics and the like with a coating layer of an amorphous silicon carbide of the formula Si.sub.x C.sub.1-x, in which x is a positive number of 0.2 to 0.9, by exposing the surface of the substrate article to an atmosphere of plasma generated in a gaseous atmosphere of an organosilicon compound having no halogen or oxygen atom directly bonded to the silicon atom, such as hexamethyl disilane, optionally admixed with a vapor or gas of a hydrocarbon compound, e.g. methane, benzene and the like.
摘要:
The invention provides a novel and efficient method for the improvement of the surface properties of a shaped article of a synthetic resin such as a vinyl chloride-based resin. In particular, the outstanding defective point of the plastic resin articles toward accumulation of static electricity on the surface is greatly reduced by the inventive method, in which the surface of the article is exposed to the low temperature plasma generated in a gaseous atmosphere containing an organic silicon compound followed, preferably, by contacting treatment with a halogen or a halogen compound such as hydrogen halides and halogen-containing organic compounds in a gaseous phase. The organic silicon compound in the gaseous plasma atmosphere is preferably diluted with a diluent gas which may be nitrogen, nitrogen oxides, ammonia or rare gases at a specified partial pressure.
摘要:
The invention provides a novel method for the preparation of a composite shaped article of a vinyl chloride-based resin clad with a coating layer of polyvinyl alcohol without the use of any adhesive agent. The method comprises subjecting the surface of the shaped article to exposure to an atmosphere of low temperature atmosphere, coating the thus plasma-treated surface of the shaped article with an aqueous solution of a polyvinyl alcohol and drying. The coating layer of the polyvinyl alcohol thus formed is so firmly bonded to the surface of the vinyl chloride-based resin shaped article that various advantageous properties are imparted to the shaped article.
摘要:
The invention provides a novel method for obtaining a shaped article of a vinyl chloride-based resin which is markedly insusceptible to the undesirable phenomenon of exudation or bleeding of the plasticizer and other additive ingredients contained therein on to the surface of the article. The method comprises formulating the resin composition for the fabrication of the shaped article with an epoxy compound containing, preferably, at least 2% by weight of the oxirane oxygen in the molecule in an amount of at least 0.05% by weight based on the vinyl chloride-based resin and irradiating the shaped article with ultraviolet light having a substantial energy distribution in the wavelength region of 200 nm or shorter. The shaped article obtained by the inventive method is remarkably insusceptible to the plasticizer bleeding even after prolonged outdoor exposure or irradiation with ultraviolet light having wavelengths longer than 290 nm.