摘要:
An optical device comprising a mixture of a polymer constituted mainly of aromatic vinyl monomer units and polyphenylene ether, characterized in that the average molecular weight of the polyphenylene ether is from 0.3 to 0.7 expressed in terms of the intrinsic viscosity measured in chloroform at 25.degree. C.
摘要:
A process for the production of formed articles of aromatic vinyl resin having a small birefringence and a high refractive index by a cast polymerization process rapidly and with high productivity, wherein the formed articles of aromatic vinyl resin are light and useful for the production of various optical elements such as lenses and prisms.
摘要:
An acrylic resin composition having excellent permanent antistatic properties, which comprises a copolymer of an acrylic monomer comprising predominantly methyl methacrylate with a specific sulfonate and optionally a specific alkylene oxide and/or acidic phosphate, and a method for the production thereof. The acrylic resin composition of the invention shows excellent antistatic properties without losing the excellent properties of methacrylic resin, such as excellent transparency, mechanical properties, heat resistance, etc., and is useful for various utilities, such as preparation of advertising display, lighting fixtures, covers, nameplate, and various decoratings.
摘要:
A process for the production of a thermoplastic copolymer having excellent heat distortion resistance is disclosed. The process includes heat-treating a raw copolymer comprising a vinyl monomer unit including methacrylic and/or acrylic acid units in the presence of a specific ring-closing promoter selected from basic compounds, whereby the methacrylic and/or acrylic acid unit is converted into six-membered cyclic anhydride unit. The copolymer has excellent heat distortion resistance, transparency, mechanical properties and processability, and can produce a formed product without splash on the surface. The copolymer is useful for the production of various parts, such as automobile parts, electrical parts, industrial parts, and miscellaneous goods.
摘要:
A polymerization can be carried out rapidly by polymerizing a methacrylate ester or a mixture of unsaturated monomers comprising the methacrylate ester as a main component in the presence of (1) a hydroperoxide polymerization initiator, (2) a reductant containing sulfur in a molecule, (3) a hydrogen halogenide salt of amine or a quarternary halogenide and (4) a copper-containing compound.
摘要:
A continuous casting process and apparatus for a liquid polymerizable composition comprising a pair of endless belts which are arranged such that the lower run of the upper belt is disposed above the upper run of the lower belt and said runs are caused to move in the same direction at substantially the same speed; feeding a liquid polymerizable composition into a space defined between said runs; feeding at least one continuous gasket into said space, together with said composition, in such a manner that said gasket is passed between and in contact with the opposing surfaces of each of the opposite edges of said belts to provide a pair of seals which circumscribe said edges of the moving belts; subjecting said composition to partial polymerization to such an extent that the viscosity of said composition in terms of poise is within the range of 2 to 5 determined by a common logarithm of said viscosity at the temperature of polymerization; leading said partially polymerized composition in a path which is arranged such that said runs are curved at least twice through an inflection point and at the same time brought slightly closer together in response to the volume change of said composition during polymerization without causing the two opposing surfaces of said composition to depart from contact with the associated runs of the belts; and removing the resulting polymerized plate from the discharge end of the belts.
摘要:
An acrylic resin composition having excellent permanent antistatic properties, which comprises a copolymer of an acrylic monomer comprising predominantly methyl methacrylate with a specific sulfonate and optionally a specific alkylene oxide and/or acidic phosphate, and a method for the production thereof. The acrylic resin composition of the invention shows excellent antistatic properties without losing the excellent properties of methacrylic resin, such as excellent transparency, mechanical properties, heat resistance, etc., and is useful for various utilities, such as preparation of advertising displays, lighting fixtures, covers, nameplates, and various decorations.
摘要:
A continuous process for producing plate-like polymer articles which comprises subjecting a liquid polymerizable composition comprising a syrup of methyl methacrylate and a specified amount of a polymerization initiator of the formula: ##STR1## (in which R is a C.sub.4 -C.sub.10 alkyl or alkoxyalkyl group), to a casting polymerization at a specified temperature. By this process, plate-like polymer articles having a high quality can be obtained in a very short polymerization time.
摘要:
Provided are a method for producing a crystalline methacrylic resin, the method comprising a step of bringing a mixture of an isotactic methyl methacrylate-type polymer and a syndiotactic methyl methacrylate-type polymer into contact with high pressure gas and a method for producing a plastic foam of the crystalline methacrylic resin, the method comprising a step of foaming the mixture. According to the method of the present invention, a crystalline methacrylic resin which is not limited in a form applicable to molded articles thereof and has high crystallinity and excellent solvent resistance can be obtained in a simple method and a plastic foam of the crystalline methacrylic resin can be obtained, the plastic foam embracing fine cells having an average cell diameter of about 10 &mgr;m or less and a cell number density of 109 to 1015 cells/cm3. Such a plastic foam is superior in the solvent resistance and in the mechanical properties such as impact resistance and bending strength.
摘要翻译:提供一种生产结晶甲基丙烯酸树脂的方法,该方法包括使全同立构甲基丙烯酸甲酯类聚合物和间同立构甲基丙烯酸甲酯类聚合物的混合物与高压气体接触的步骤和制造塑料泡沫的方法 的结晶甲基丙烯酸树脂,该方法包括使混合物发泡的步骤。 根据本发明的方法,可以简单的方法得到结晶性甲基丙烯酸系树脂,其结晶性甲基丙烯酸系树脂的塑料泡沫体可以通过简单的方法得到结晶性甲基丙烯酸系树脂,该结晶性甲基丙烯酸系树脂不限于其成形品,结晶性高,耐溶剂性优异 可以获得具有平均泡孔直径约10μm或更小并且孔数密度为109至1015个/ cm 3的细胞的塑料泡沫。 这种塑料泡沫体的耐溶剂性和耐冲击性和弯曲强度等机械性能优异。
摘要:
A coating composition is disclosed which includes(A) 15 to 65% by weight (calculated as SiO.sub.2) of colloidal silica,a partially hydrolyzed and partially co-condensed product of the following component (B) and component (C):(B) 10 to 80% by weight (calculated as R.sup.1 Si(OH).sub.3) of a trialkoxysilane of the formula: R.sup.1 Si(OR.sup.2).sub.3 wherein the group R.sup.1 is methyl or vinyl and the group R.sup.2 is alkyl having 1 to 4 carbon atoms,(C) 1 to 50% by weight (calculated as R.sup.3.sub.n Si(OH).sub.4-n) of an acetoxysilane of the formula: R.sup.3.sub.n Si(OCOCH.sub.3).sub.4-n wherein the group R.sup.3 is alkyl having 1 to 3 carbon atoms, vinyl, phenyl, or mercaptoalkyl having 1 to 3 carbon atoms, and n is an integer of 0 to 2, provided that the total amount of the component (B) wherein the group R.sup.1 is methyl and the component (C) wherein the group R.sup.3 is methyl and n is 1 is in the range of from 10% by weight to less than 70% by weight based on the whole amount of the components (B) and (C), and(D) a solvent.The composition is useful for coating plastic articles and metallic articles to improve their surface properties such as surface hardness, chemical resistance, etc.