摘要:
Conjugated diolefinic polymers having a molecular weight of less than 1,000,000 can be produced at high polymerization rates and in high yields by polymerizing a conjugated diolefin or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in the presence of an alfin catalyst, in which as a molecular weight regulator is used a halogenated unsaturated hydrocarbon represented by the formula, ##EQU1## wherein R is an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, an alkyl-substituted phenyl group, a halogen atom or a hydrogen atom, and X, Y and Z which may be same or different are individually a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, at least one of the R, X, Y and Z being a halogen atom. The above-mentioned molecular weight regulator not only displays a prominent molecular weight-regulating effect, even when used in a small amount, but also is easily commercially obtainable and inexpensive, so that marked commercial advantages can be attained according to the above-mentioned process.
摘要翻译:分子量小于1,000,000的共轭二烯烃聚合物可以在高聚合速率下以高收率产生,通过聚合共轭二烯烃或共轭二烯烃与乙烯基芳族烃在烯属催化剂存在下共聚,其中作为分子 使用由式RY ANGLE C = C ANGLE XZ表示的卤代不饱和烃,其中R是具有1至7个碳原子的烷基,乙烯基,苯基,烷基取代的苯基,卤素 原子或氢原子,X,Y和Z可以相同或不同,分别为氢原子,卤素原子或碳原子数1〜4的烷基,R,X,Y和Z中的至少一个 是卤素原子。 上述分子量调节剂即使在少量使用的情况下也显示出突出的分子量调节作用,而且容易商业上可获得并且价廉,因此可以根据上述方法获得显着的商业优点 。
摘要:
A process for producing a polymer having functional groups at its chain terminals, which comprises reacting a polymer having alkali metal atoms at its chain terminals with an alkylene oxide or sulfide in a hydrocarbon medium having a solubility parameter of 7.2 or less at 25.degree. C. This process makes it possible to produce the said polymer in a short period of time without necessitating a large power for agitation. According to this process, there can be produced a polymer having a functionality near the theoretical functionality in a short period of time.
摘要:
A photosensitive composition comprising (1) a maleic anhydride adduct of 1,2-polybutadiene having a molecular weight of 10,000 or higher, (2) at least one photosensitizer and/or at least one photosensitive crosslinking agent, and, if necessary, (3) at least one acrylic monomer. This composition can be developed with water or a polar solvent such as an alcohol, and its layer formed on a support provides a printing plate. When the acrylic monomer is contained, the composition is suitable for use in flexographic printing.
摘要:
A gypsum composition obtained by molding and drying an aqueous slurry comprising calcined gypsum, polyvinyl alcohol, and at least one metal compound. The composition has high surface hardness and high water resistance.
摘要:
A method for the conversion of an unsaturated compound having a functional group, characterized by contacting [1] at least one compound selected from the group consisting of carboxylic acid esters, nitriles, ketones, amides, and ethers and having a carbon-to-carbon double bond and no unsaturation at the position conjugate to said double bond, or a mixture of said compound [1] and [2] at least one compound selected from the group consisting of ethylenically unsaturated compounds having a carbon-to-carbon double bond and neither unsaturation at the position conjugate to said double bond nor a functional group, with a catalyst system consisting essentially of a combination of (A) at least one member selected from the group consisting of tungsten compounds, molybdenum compounds, and rhenium compounds, with (B) at least one organoaluminum compound having at least one carbon-to-aluminum bond.
摘要:
A process for preparing crystalline 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst consisting of (A) a cobalt compound, (B) an organoaluminum compound, (C) water in an amount of 0.25 to 1.5 mole per mol of said organoaluminum compound, and (D) an organic phosphorus compound in a halogenated hydrocarbon solvent to polymerize the butadiene, characterized in that as said organic phosphorus compound there is used a compound represented by the formula: ##STR1## wherein R.sup.1 is an alkyl or aryl group, and R.sup.2 and R.sup.3 represent independently hydrogen, or alkyl or aryl groups. This process can produce 1,2-polybutadiene having a degree of crystallization of 25 to 50% in a high yield at a temperature of from 0.degree. to 30.degree. C.
摘要:
In the production of 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst composed of (A) a cobalt compound, (B) an organic phosphine compound, (C) trialkylaluminum and (D) water in an amount of 0.25 to 1.5 moles per mole of said trialkylaluminum, the addition of (E) at least one compound selected from the group consisting of allyl halides, alkyl-substituted allyl halides, benzyl halides, alkyl-substituted benzyl halides, and tertiary aliphatic halides to the reaction system enables the molecular weight of the objective 1,2-polybutadiene to be regulated to any desired value without causing any change in microstructure and degree of crystallization of the product and also without deteriorating so much the polymerization activity.
摘要:
A novel copolymer is obtained by reacting [A] at least one norbornene derivative having at least one polar group or polar-group-containing substituent with [B] at least one unsaturated polymer having carbon-to-carbon double bonds in the presence of a metathesis catalyst. This copolymer is excellent in chemical and mechanical properties. Particularly, when 50% by weight or more of the component [A] is contained, the resin is distinguished for its high impact strength.
摘要:
A process for producing a conjugated diolefinic polymer by polymerizing at least one conjugated diolefin or copolymerizing at least one conjugated diolefin with at least one vinyl aromatic hydrocarbon in a hydrocarbon solvent in the presence of an alfin catalyst and at least one molecular weight regulator selected from the group consisting of (A) unsaturated halohydrocarbons represented by the general formula, RCX .dbd. CYZ, wherein R represents hydrogen, an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, a substituted phenyl group, or a halogen atom and X, Y and Z represent independently a hydrogen or halogen atom, at least one of said R, X, Y and Z being a halogen atom, (B) halogenated aromatic hydrocarbons, (C) ethers, polyethers, and acetals and (D) tertiary amines and, if necessary, a dihydro aromatic hydrocarbon, characterized in that said polymerization or copolymerization is effected in the presence of 0.03 to 0.9 mole of water and/or an alcohol per mole of organosodium contained in said alfin catalyst. According to this invention, there is obtained a polymer or copolymer excellent in green strength and processability of the unvulcanized compound and in physical properties of the vulcanizate.
摘要:
A process for producing a maleic anhydride adduct of high molecular weight 1,2-polybutadiene by contacting with heat maleic anhydride with high molecular weight 1,2-polybutadiene in the absence of a radical initiator in a halogenated aromatic hydrocarbon solvent. The adduct obtained by this process has a high molecular weight of more than 10,000 and is quite free from gel. Said process enables the addition of maleic anhydride in any desired proportion.