Abstract: A process for preparing a 2,2,6,6-tetrahalocyclohexaneimine derivative (I) which comprises reacting a 2,2,6,6-tetrahalocyclohexanone with a primary amine or ammonia in the presence of a Lewis acid, a process for preparing a 2,6-dihaloaniline derivative (II) which comprises subjecting the 2,2,6,6-tetrahalocyclohexaneimine derivative (I) to dehydrohalogenation in the presence or absence of a catalyst, and an N-phenyl-2,2,6,6-tetrahalocyclohexaneimine. According to the process of the present invention, the 2,2,6,6-tetrahalocyclohexaneimine derivative (I) can be prepared from inexpensive starting materials in high yield through a few steps. Also, the 2,6-dihaloaniline derivative (II) can be prepared from inexpensive starting materials in high yield and high purity through a few steps. Further, the N-phenyl-2,2,6,6-tetrahalocyclohexaneimine is very useful in the preparation of N-phenyl-2,6-dihaloaniline.

Abstract: A multilayer sliding material which is used, in particular, as the material of the bearings in internal combustion engines, comprising a steel backing layer, a bearing layer of copper-based alloy bonded to the steel backing layer, a silver or silver alloy plating layer bonded to the bearing layer, and a surface layer of lead-based alloy bonded to the silver or silver alloy plating layer, the silver or silver alloy plating layer having a thickness of more than 3 microns but not more than 50 microns. The multilayer sliding material having a thick plating layer of silver or silver alloy, excels in seizure-resisting.

Abstract: There are disclosed a process for preparing 2-hydroxy-2-(6-methoxy-2-naphthyl)propionic acid or 2-hydroxy-(4-substituted phenyl)propionic acid derivative which comprises reacting 2-methoxynaphthalene or substituted benzene derivatives with pyruvic acid in the presence of a Lewis acid and then, if necessary, hydrolyzing the obtained product, and a process for preparing 2-(6-methoxy-2-naphthyl)propionic acid or 2-(4-substituted phenyl)propionic acid derivative which comprises reducing 2-hydroxy-2-(6-methoxy-2-naphthyl)propionic acid or 2-hydroxy-2-(4-substituted phenyl)propionic acid derivative in a lower aliphatic acid in the presence of an inorganic acid under hydrogen atmosphere by using a metal catalyst.

Abstract: A process for preparing a 2,2,6,6-tetrahalocyclohexanimine derivative (I) which comprises reacting a 2,2,6,6-tetrahalocyclohexanone with a primary amine or ammonia in the presence of a Lewis acid, a process for preparing a 2,6-dihaloaniline derivative (II) which comprises subjecting the 2,2,6,6-tetrahalocyclohexaneimine derivative (I) to dehydrohalogenation in the presence or absence of a catalyst, and an N-phenyl-2,2,6,6-tetrahalocyclohexaneimine. According to the process of the present invention, the 2,2,6,6-tetrahalocyclohexaneimine derivative (I) can be prepared from inexpensive starting materials in high yield through a few steps. Also, the 2,6-dihaloaniline derivative (II) can be prepared from inexpensive starting materials in high yield and high purity through a few steps. Further, the N-phenyl-2,2,6,6-tetrahalocyclohexaneimine is very useful in the preparation of N-phenyl-2,6-dihaloaniline.

Abstract: A polyethylene composition having excellent melt moldability which substantially comprises an ultrahigh-molecular-weight polyethylene having a molecular weight of, for example, at least about 1,650,000 and a low-molecular-weight to high-molecular-weight polyethylene having a molecular weight of, for example, about 1500 to about 360,000. The composition is produced by a multi-stage polymerization process involving a step of producing the ultrahigh-molecular-weight polyethylene and a step of producing the low-molecular-weight to high-molecular-weight polyethylene.

Abstract: A polybutadiene rubber having an enhanced mechanical strength is produced in such a manner that the content of water in a solution of 1,3-butadiene in an inert organic solvent is controlled to 0.2 to 5 millemoles per liter of 1,3-butadiene; a first polymerization mixture is prepared from the controlled 1,3-butadiene solution, an organic aluminum compound of the formula Al R.sub.n X.sub.3-n, wherein R=C.sub.1-6 alkyl, phenyl, or cycloalkyl, X=halogen, and n=1.5-2.0, and a cobalt compound, for example, by aging a mixture of the controlled 1,3-butadiene solution with the aluminum compound for at least one minute and then by admixing the aged mixture with the cobalt compound; the first polymerization mixture is subjected to a cis-1,4-polymerization; a second polymerization comprising the resultant cis-1,4-polybutadiene, non-reacted 1,3-butadiene, the inert organic solvent, and a catalyst comprising an organic aluminum compound of the formula AlR.sub.

Abstract: A polybutadiene rubber having an enhanced mechanical strength is produced in such a manner that the contents of water and carbon disulfide in a solution of 1,3-butadiene and carbon disulfide in an inert organic solvent is controlled to 0.2 to 5 m moles and 20 m moles or less, respectively, per liter of the 1,3-butadiene-carbon disulfide solution; a first polymerization mixture is prepared from the controlled 1,3-butadiene-carbon disulfide solution, an organic aluminum compound of the formula Al R.sub.n X.sub.3-n, wherein R=C.sub.1-6 alkyl, phenyl, or cycloalkyl, X=halogen, and n=1.5-2.

Abstract: Butadiene polymers containing 70% or more of 1,2-structure and a relatively low melting point are produced by polymerizing 1,3-butadiene in the presence of a catalyst which has been prepared by admixing (A) an organic solvent solution containing 1,3-butadiene, a cobalt compound and an organoaluminium compound; (B) an amide compound of the formula (2) or (3): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are respectively an H atom, aliphatic hydrocarbon radical of 1 to 7 carbon atoms or aromatic hydrocarbon radical of 6 or 7 carbon atoms, R.sub.3 is H or an aliphatic hydrocarbon radical of 1 to 3 carbon atoms and n is 2 to 5, and; (C) carbon disulfide.

Abstract: A process for producing a polybutadiene is provided wherein, first, 1,3-butadiene is polymerized in the presence of a particular cis-1,4-polymerization catalyst and subsequently, the polymerization is continued in the presence of a particular 1,2-polymerization catalyst. The resulting polybutadiene is characterized as containing 2 to 40% of the 1,2-structure, the melting point of the 1,2-structure portion being 110.degree. to 215.degree.C, and containing 60 to 98% of the cis-1,4-structure and having an intrinsic viscosity [.eta.] of 0.9 to 8 in tetraline at 135.degree.C. A vulcanized product of the polybutadiene is characterized as possessing improved tear strength, flex-crack resistance and tensile strength.