摘要:
A colored styrenic resin composition comprises 100 parts by weight of a styrenic resin, 0.1 to 5 parts by weight of titanium oxide and 0.05 to 2.5 parts by weight of an organo-tin compound and in which the amount of the organo-tin compound is not less than 10% by weight on the basis of the amount of the titanium oxide. The resin composition ensures the production of injection-molded articles free of black streaks and, therefore, the articles formed from the resin composition of the invention have high commercial value. The colored styrenic resin composition is useful as a material for the production of housings of, for example, a variety of electric appliances and office machinery and equipment as well as miscellaneous goods.
摘要:
A process for continuously preparing rubber modified styrene resins from styrene monomers and acrylonitryle monomers in the presence of a rubbery polymer in accordance with a continuous mass and/or solution polymerization method by the use of serial polymerization device comprising two or more reactors; said process comprising(1) a first step of feeding a polymeric materials to the first reactor to carry out the polymerization of monomers in a condition where the rubbery polymer is not inverted to the dispersed phase, and a second step of adding a polymeric materials to second reactors to carry out the polymerization of the monomers and to thus invert the rubbery polymer to the dispersed phase,(2) a ratio of the added materials to the materials used in the first step being in the range of from 10 to 220% by weight,whereby impact resistance and surface gloss can be remarkably improved.
摘要:
A transparent, rubber-modified styrene resin comprises 70 to 96 parts by weight of a copolymer formed of 20 to 70 wt. % of styrene monomer units and 30 to 80 wt. % of alkyl (meth)acrylate monomer units and 4 to 30 parts by weight of a rubbery polymer. The rubbery polymer is dispersed in the copolymer as particles having an average particle size of 0.1 to 2.0 .mu.m. At least 70 wt. % of the rubbery polymer is a styrene-butadiene block copolymer which is formed of 5 to 50 wt. % of styrene units and 50 to 95 wt. % of butadiene units, has a viscosity in a range of 3 to 60 cps when measured as a 5 wt. % styrene solution at 25.degree. C. and possesses a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) in a range of 1.0 to 1.8. The copolymer and the rubbery polymer have substantially the same refractive index. Also disclosed is a production process of the transparent, rubber-modified styrene resin, which comprises polymerizing a styrene monomer and an alkyl (meth)acrylate to a high degree of polymerized conversion in the presence of the rubbery polymer so that the rubbery polymer is formed into particles while allowing the copolymer to occur with substantially the same refractive index as the rubbery polymer.
摘要:
A rubber modified styrenic resin composition which can be obtained by dispersing rubber-like polymer particles in a homopolymer or a copolymer of a styrenic monomer. The rubber modified styrenic resin composition has:(a) a volume-average particle size of the rubber-like polymer particles is in the range of from 0.2 to 0.8 .mu.m,(b) a particle size distribution curve on the basis of the volume of the rubber-like polymer particles has one peak,(c) a ratio of a 5% value to a 95% value of the cumulative distribution of the particle size on the basis of the volume of the rubber-like polymer particles is in the range of from 3 to 45.The rubber-like polymer particles comprise (i) a styrene-butadiene block copolymer (I), and (ii)(1) a styrene-butadiene block copolymer (II), (2) a polybutadiene (III), or (3) a styrene-butadiene block copolymer (IV) and polybutadiene (V), wherein (I) contains 25-50 % styrene, (II) and (IV) contain 5-20% styrene, the weight ratio of: (I)/(II), (I)/(III) and (I)/(IV) is from 95/5 to 40/60 and {(I)+(IV)}/(V) is from 99/1 to 70/30 and (I) to (V) are of specified styrene solution viscosity.
摘要:
A process for the (co)polymerization of a monomer material, which includes at least an acrylonitrile monomer as an essential component, at a temperature of 80.degree. C. or higher by bulk or solution polymerization while allowing said monomer material to evaporate. The (co)polymerization is conducted while providing a vapor phase over a polymerization mixture in a reaction tank. During the (co)polymerization, the temperature of the vapor phase is maintained in a range of from 30.degree. C. to 65.degree. C. so that the polymerization is conducted without substantially releasing vapor, which is evaporated from the polymerization mixture, to outside of the reaction tank. By cooling the vapor phase of the reaction tank and maintaining its temperature in the above specific range in accordance with the present invention, it is possible to avoid mixing of a gelled polymer in a product and also to effectively remove reaction heat at the time of the (co)polymerization.
摘要:
A molding of an ABS-based resin is described. Rubber particles located at a depth of 0.5-1.5 .mu.m from a surface of the molding morphologically comprise at least the following two types of particles:(1) A particles having an a/b ratio not greater than 1.5, wherein a and b represent a major axis and a minor axis, respectively, and(2) B particles having an a/b ratio not smaller than 5, wherein a and b have the same meanings as defined abovewhen a section extending at the depth in parallel with the surface of the molding is observed in an electron micrograph taken by the ultrathin sectioning technique. Assuming that the total area of the rubber particles as observed in the electron micrograph is 100%, the total area of the A particles accounts for at least 10% and that of the B particles is in a range of 0.01-90%.
摘要:
The invention provides a rubber dispersed copolymer resin having excellent heat resistance, impact strength and moldability and composed of (1) a dispersed phase formed of a rubbery polymer and copolymerized styrene-type, acrylonitrile-type and maleimide-type monomers, said rubbery polymer specifically controlled occluding the copolymer of monomers, being grafted with the copolymer and/or forming a multicomponent gel together with copolymers, and (2) a continuous phase formed at least of a specifically controlled copolymer of the styrenetype, acrylonitrile-type and maleimide-type monomers. The resin is useful as a molding material for electric appliances, electronic equipment and cars.
摘要:
Disclosed is a continuous bulk polymerization reactor comprising a cylindrical reaction vessel elongated in the direction of the reacting fluid and a shaft installed within the reaction vessel. A plurality of flow of double helical-ribbon agitators are attached to the shaft in such a way that they face in the same direction, and a plurality of baffles having a relative open area of 5 to 40% based on the cross-sectional area of the internal space of the reaction vessel, are disposed between any adjacent ones of the agitators. Thus the formation of stagnant fluid pockets is avoided and excellent piston flow properties are achieved.
摘要:
A method for removing volatile materials, comprises adding a blowing aid to a polymer composition containing volatile materials, mixing them in a static mixing apparatus, and extruding the resultant mixture by an extruding apparatus into a devolatilizing tank, thereby the mixture is made to be blown, to cause removal of the volatile materials. First, the blowing aid (6) is discharged with an addition nozzle apparatus (2), in a direction opposite to the direction of the flow of the polymer composition (1), to be added, and the polymer composition is introduced into the static mixing apparatus (3), at a pressure at which the blowing does not take place, thereby mixing them. Then, using the extruding apparatus (11), the resultant mixture is extruded into the devolatilizing tank (4), so that the polymer is made into a blown product at such a temperature and a pressure that the blowing coefficient B is 1.4 or more, thereby causing the removal of volatile materials.B=A'/A Expression (1)wherein A represents the cross-sectional area of an extruding apparatus, and A' represents the average cross-sectional area of the polymer composition in a direction perpendicular to the vertical direction of the blown polymer composition, at a point where the polymer composition is dropped from the lower part of an opening section of the extruding apparatus vertically 50 cm to 1 m. The method can give a polymer composition having residual volatile materials in very small amounts, by removing volatile materials continuously with high efficiency.
摘要:
A process for preparing rubber modified high impact resins by dissolving a rubbery polymer in a monomer containing an aromatic vinyl monomer or a mixture of an aromatic vinyl monomer and a vinyl cyanide monomer followed by polymerizing the monomer, the two steps being carried out in at least two polymerization reactors with a particle disperser placed between the first and second reactors. High impact resins having excellent surface properties are obtained with a savings in a power consumption by controlling:(1) the relationship between the concentration of the polymerized monomer and the content of the rubbery polymer in the first reactor;(2) the relationship between the volume occupied by the polymerizing liquid in the first reactor and the inner volume of the particle disperser; and(3) the peripheral linear velocity of a shearing stirrer in the particle disperser.