摘要:
An austenitic stainless steel for use for high temperature concentrated sulfuric acid which comprises, on weight basis, 0.04% or less of C, 5-7% of Si, 2% or less of Mn, 15-25% of Cr, 4-24% of Ni, 0.01-1.07% of Pd and the rest consisting of Fe and unavoidable contaminant materials. By the incorporation of small amount of palladium in a basal austenitic stainless steel containing the essential three elements of Cr, Ni and Si, a superior corrosion resistance against highly concentrated high temperature sulfuric acid is attained.
摘要:
An ultraviolet curable ink composition comprising, as main components,(A) a polyurethane poly(meth)acrylate obtained by reacting a polyisocyanate compound of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, and n is an integer of from 1 to 20, with a hydroxyl group-containing (meth)acrylate, and having, in one molecule, at least two (meth)acryloyl groups and at least two urethane bonds,(B) a radical polymerizable low molecular weight compound, and(C) a photopolymerization initiator.
摘要:
A plastic lens having a refractive index of not less than 1.55, comprising a polymer formed from dimethallyl phthalate as major monomeric constituent and, if necessary, one or more monomers represented by the general formula ##STR1## wherein R.sub.1 and R.sub.2 represent each a hydrogen atom or methyl group and m and n represent each an integer of from 0 to 3, or ##STR2## wherein R.sub.3 and R.sub.4 represent each a hydrogen atom or methyl group and n represents an integer of from 2 to 9. A method for manufacturing such a lens is also disclosed.
摘要:
An undercoat composition for ceramic flame spraying and composite molded articles produced using the undercoat composition are disclosed. The undercoat composition comprises an inorganic filler component having complex irregularities in the surface thereof and an organic binder component. The composite molded articles comprises a substrate, a ceramic flame sprayed coating, and an intermediate layer between the substrate and the ceramic flame sprayed coating, said intermediate layer being made of the above undercoat composition. The present undercoat composition permits good ceramic flame spraying, and there can be obtained composite molded articles having good impact resistance and environmental resistance.
摘要:
A plastic lens which comprises a polymer (A) containing as major component at least one radicalpolymerizable biphenyl compound represented by the general formula [I]: ##STR1## wherein each of R's represents a hydrogen atom or methyl group, has a high refractive index of not less than 1.55 and is excellent in transparency, processability, impact resistance, and dyeability.
摘要:
A coating composition, which is excellent in abrasion resistance, comprises spherical .alpha.-alumina particles, a binder and a solvent, in which said spherical .alpha.-alumina particles are contained in an amount of from 35 to 85% by weight of the solid content in the coating composition.
摘要:
There are disclosed a thermal insulating foamed material, which is superior in thermal insulating property and does not cause deterioration of the thermal insulating property with a time lapse, and a method for producing the same. According to a method for producing a thermal insulating foamed material, a foamed polyurethane resin composition having closed cells, in which at least carbon dioxide is filled, is formed by blowing a raw material mixture containing epoxides comprising at least two members of an epoxide compound having high reactivity with carbon dioxide and an epoxide compound having low reactivity with carbon dioxide, a carbon dioxide fixation catalyst, polyisocyanate, a reactive blowing agent which evolves carbon dioxide by reacting with said polyisocyanate, and a polyol composition. Then, the carbon dioxide in the closed cells is allowed to react with the epoxides in the presence of the carbon dioxide fixation catalyst, thereby to fix carbon dioxide as carbonate compounds.
摘要:
A novel resin which is easily cured by crosslinking by irradiation of radiant or UV rays is prepared by combining a radical polymerizable compound (A) having a molecular weight of not more than 2000 and having at least two (meth)acryloyl group and one or more of hydroxyl group and a compound (B) having an alkyl or alkylene group with carbon atoms of 7 or more, at least one polymerizable unsaturated groups and at least one hydroxyl groups, by using a diisocyanate compound. This resin is very suitable as binder for ink.
摘要:
An insulated structure is formed by injection of a foamed thermal-insulating material created by foaming into a space between a plastic board and metal plate with a disposition of copper pipes. A non-halogenated organophosphorus compound having a molecular weight over 150 as an additive with an OH group as a functional group is mixed with the raw materials of the foamed thermal-insulating material including polyol, a foam stabilizer, a catalyst, a foaming agent having at least one component of hydrocarbon, and an organic polyisocyanates. By adding a non-halogenated organophosphorus compound, which has a molecular weight over 150 as an additive with an OH group as a functional group, the burning rate of the foamed thermal-insulating material becomes the same as that of the foamed thermal-insulating material which uses CFC11 as a foaming agent. Also, the possibilities of phosphor corrosion by free ionization to copper pipes, which are disposed inside of the insulated structure, are eliminated and phosphorus transfer to the plastic board and worries of food contamination are also eliminated.
摘要:
A thermal insulating foamed material is a polyurethane foam having closed cells, and produced by mixing, agitating and foaming a polyol, a polyisocyanate, a foam stabilizer, a catalyst, a blowing agent and a carbon dioxide adsorbent. The carbon dioxide adsorbent is produced by mixing and granulating powders of at least one member of alkali metal hydroxides and alkaline-earth metal hydroxides and organic or inorganic powders having a water absorbing property and soaked with water in advance, and formed by a resin film, such as a methacrylic acid ester, which is permeable to carbon dioxide but hardly permeable to water.