Abstract: A highly crystalline semi-rigid random 1-butene/ethylene copolymer consisting of 1-butene and ethylene, said copolymer having the following characteristics (A) to (K);(A) it consists of 99 to 90 mole % of the 1-butene component and 1 to 10 mole % of the ethylene component,(B) it has an intrinsic viscosity (.eta.), measured in decalin at 130.degree. C., of from 0.5 to 6 dl/g,(C) it has a DSC melding point (Tm) measured by a differential scanning calorimeter, of from 100.degree. to 120.degree. C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 20 to 58%,(E) the amount (W.sub.1 in % by weight) of that portion of it which is soluble in boiling methyl acetate is not more than 2%,(F) the amount (W.sub.2 in % by weight) of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10.degree. C. is less than 5.times.(.eta.).sup.-1.2,(G) it has a yield strength of 30 to 180 kg/cm.sup.2,(H) it has a tensile strength at break of 200 to 800 kg/cm.sup.

Abstract: A highly crystalline semi-rigid random 1-butene/ethylene copolymer consisting of 1-butene and ethylene, said copolymer having the following characteristics (A) to (K);(A) it consists of 99 to 90 mole % of the 1-butene component and 1 to 10 mole % of the ethylene component,(B) it has an intrinsic viscosity (.eta.), measured in decalin at 130.degree. C., of from 0.5 to 6 dl/g,(C) it has a DSC melding point (Tm) measured by a differential scanning calorimeter, of from 100.degree. to 120.degree. C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 20 to 58%,(E) the amount (W.sub.1 in % by weight) of that portion of it which is soluble in boiling methyl acetate is not more than 2%,(F) the amount (W.sub.2 in % by weight) of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10.degree. C. is less than 5 .times. (.eta.).sup.-1.2,(G) it has a yield strength of 30 to 180 kg/cm.sup.2,(H) it has a tensile strength at break of 200 to 800 kg/cm.sup.

Abstract: Disclosed herein are (1) a film of a liquid crystalline wholly aromatic polyester which is non-oriented and transparent, which film can be prepared by dissolving a liquid crystalline wholly aromatic polyester in a solvent, casting the resulting solution to form a film and volatirizing the solvent from the film as cast and (2) a film of a liquid crystalline wholly aromatic polyester which is oriented and polarizing, which film can be prepared by orienting the above-mentioned non-oriented film by drawing or heating.

Abstract: A random 1-butene copolymer comprising 1-butene and an alpha-olefin having 5 to 20 carbon atoms, said copolymer having the following characteristics (A) to (I):(A) it comprises 50 to 99 mole % of the 1-butene component and 1 to 50 mole % of the alpha-olefin component,(B) it has an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.5 to 6 dl/g,(C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30.degree. to 120.degree.0 C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 5 to 60%,(E) the amount [W.sub.1 in % by weight] of that portion of it which is soluble in boiling methyl acetate is not more than 2%, and(F) the amount [W.sub.2 in % by weight] of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10.degree. C. is less than 5.times.[.eta.].sup.-1.2.

Abstract: A random 1-butene/ethylene copolymer comprising 1-butene and ethylene, said copolymer having the following characteristics (A) to (I):(A) it comprises 50 to 99 mole % of the 1-butene component and 1 to 50 mole % of the ethylene component,(B) it has an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.5 to 6 dl/g,(C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30.degree. to 130.degree. C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 1 to 60%,(E) the amount [W.sub.1 in % by weight] of that portion of it which is soluble in boiling methyl acetate is not more than 2%, and(F) the amount [W.sub.2 in % by weight] of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10.degree. C. is less than 5.times.[.eta.].sup.-1.2.

Abstract: A melt-moldable wholly aromatic polyester comprising (A) aromatic hydroxycarboxylic acid residues, (B) aromatic diol residues, (C) 4,4'-dihydroxydiphenyl ether residues represented by the following formula ##STR1## and (D) aromatic dicarboxylic acid residues, and a melt-moldable wholly aromatic polyester comprising (A) aromatic hydroxycarboxylic acid residues, (C)' aromatic diol residues represented by the following formula--O--Ar.sup.4 --O--wherein Ar.sup.4 represents a group at least 60 mole % of which consists of a group of the following formula (a) ##STR2## or a group of the formula (a) and a group of the following formula (b) ##STR3## and (D) aromatic dicarboxylic acid residues.

Abstract: A crystalline random propylene copolymer composition comprising (i) a crystalline random propylene copolymer comprising 99 to 85 mole % of propylene and 1 to 15 mole % of an alpha-olefin other than propylene and (ii) a random 1-butene copolymer comprising ethylene and 1-butene, the weight ratio of the copolymer (i) to the copolymer (ii) being in the range of from 5:95 to 90:10, said random 1-butene copolymer (ii) satisfying the following conditions:(A) it comprises 1 to 50 mole % of the ethylene component and 50 to 99 mole % of the 1-butene component,(B) it has an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.5 to 6 dl/g,(C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30.degree. to 130.degree. C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 1 to 60%,(E) the amount [W.sub.1 in % by weight] of that portion of it which is soluble in boiling methyl acetate is not more than 2%, and(F) the amount [W.sub.

Abstract: A laminated structure comprising a substrate layer of a crystalline propylene resin and, positioned in direct contact with at least one surface of said substrate layer, a heat-sealable layer of a crystalline random propylene copolymer composition, wherein the crystalline random propylene copolymer composition is a mixture composed of(I) a crystalline random propylene copolymer of a major amount of propylene with a minor amount of another alpha-olefin, and(II) a random copolymer consisting essentially of more than 60 to 99 mole % of 1-butene and less than 40 to 1 mole % of propylene,the weight ratio of (I)/(II) being from 5/95 to 90/10, and the radom copolymer (II) has(A) an intrinsic viscosity [.eta.], determined in decalin at 135.degree. C., of 0.5 to 6 dl/g,(B) a DSC melting point (Tm), measured by a differential scanning calorimeter, of 50 to 130.degree. C., (C) a degree of crystallinity, measured by X-ray diffractometry, of 5 to 60%,(D) a boiling methyl acetate-soluble content (W.sub.

Abstract: A process for producing a polymer or copolymer of 4-methyl-1-pentene, which comprises polymerizing 4-methyl-1-pentene or copolymerizing 4-methyl-1-pentene with up to about 20 mole % of an olefin having 2 to 20 carbon atoms in the presence of a catalyst comprising(A) a solid highly active titanium catalyst component composed of magnesium, titanium, halogen and a diester of a dicarboxylic acid,(B) an organoaluminum compound, and(C) an organosilicon compound represented by the following formulaR.sup.1.sub.3 Si(OR.sup.2)wherein each of R.sup.1 and R.sup.2 represents a hydrocarbon group with 1 to 5 carbon atoms, and the three R.sup.

Abstract: A crystalline random propylene copolymer composition comprising (i) a crystalline random propylene copolymer comprising 99 to 85 mole % of propylene and 1 to 15 mole % of an alpha-olefin other than propylene and (ii) a random 1-butene copolymer comprising 1-butene and an alpha-olefin having at least 5 carbon atoms, the weight ratio of the copolymer (i) to the copolymer (ii) being in the range of from 5:95 to 90:10, said random 1-butene copolymer (ii) satisfying the following conditions:(A) it comprises 50 to 99 mole % of the 1-butene component and 1 to 50 mole % of the alpha-olefin,(B) it has an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.5 to 6 dl/g,(C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30.degree. to 120.degree. C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 5 to 60%,(E) the amount [W.sub.

Abstract: A random copolymer consisting essentially of more than 60 to 99 mole % of 1-butene and less than 40 to 1 mole % of propylene, and having(A) a boiling methyl acetate-soluble content of not more than 2% by weight based on the weight of the copolymer,(B) an intrinsic viscosity [.eta.], determined in decalin at 135.degree. C., of 0.5 to 6 dl/g,(C) a n-decane/acetone (1:1 by volume) mixture-soluble content in % by weight based on the weight of the copolymer of less than the value calculated by 4.times.[.eta.].sup.-1.2,(D) a DSC melting point, determined by a differential scanning calorimeter, of 50.degree. to 130.degree. C.,(E) a yield strength, measured by JIS K-7113, of 50 to 300 kg/cm.sup.2,(F) an elongation at break, measured by JIS K-7113, of 200 to 1000%, and(G) a tensile strength at break, measured by JIS K-7113, of 150 to 800 kg/cm.sup.2.

Abstract: A process for the polymerization of butene-1 in a liquid aliphatic hydrocarbon medium in the presence of a catalyst composed of a titanium trihalide and an organoaluminum compound which comprises initially polymerizing a minor part of the butene-1 at a temperature within a range sufficiently low that a slurry of polymer in said medium is produced and then increasing the temperature of polymerization so that the greater part of the butene-1 is polymerized within a high temperature range higher than that of the initial polymerization but not at a temperature so high that the polymer formed dissolves in said medium, characterized in that (1) the initial polymerization is carried out at a temperature of not more than 20.degree. C. in the presence of said titanium trihalide in an amount of not less than 50 millimoles and up to 1,000 millimoles per liter of said medium, and then (2) the polymerization is carried out in the presence or absence of said medium at a temperature of 25.degree. C. to less than 48.degree.

Abstract: A process for producing a 4-methyl-1-pentene copolymer composition by sequential polymerization, which comprises[I] a step of polymerizing 4-methyl-1-pentene in the presence or absence of a minor amount of a C.sub.6 -C.sub.18 linear 1-olefin in a hydrocarbon liquid medium in the presence of a catalyst comprising a transition metal compound and an organometallic compound of a metal of Groups I to III of the periodic table to form reaction product containing a 4-methyl-1-pentene polymer or copolymer (A) having a 4-methyl-1-pentene content of at least about 90% by weight; and[II] a step of further copolymerizing 4-methyl-1-pentene, 1-hexane and a C.sub.7 -C.sub.10 linear 1-olefin in the presence of the reaction product containing the polymer or copolymer (A) to form a rubbery copolymer (B) having a 4-methyl-1-pentene content of about 30 to about 70% by weight, a 1-hexene content of about 10 to about 60 and a C.sub.7 -C.sub.