Abstract: The present invention provides a butene-1 polymer film which comprises a composition comprising 100 parts by weight of a butene-1 polymer having a melt index of 0.1-20 g/10 min, a ratio of weight-average molecular weight/number-average molecular weight of 3-12 and having a maximum melting point of 60.degree.-140.degree. C. measured by differential scanning calorimetric analysis method and 200 parts by weight or less of an olefin polymer and which has a tensile modulus of 500-8,000 kg/cm.sup.2, a tear strength in TD or MD of 10 kg/cm or less and a ratio of tear strength in MD and tear strength in TD (MD/TD or TD/MD) of 4 or more.The present invention further provides a laminated film comprising the above butene-1 polymer film and a different polyolefin resin layer laminated on at least one surface of the butene-1 polymer film.

Abstract: The present invention is directed to a polyolefin type resin laminate that comprises a base layer made of a polyolefin type resin consisting mainly of butene-1 type polymer in which the content of other .alpha.-olefin unit of 15 mol % or below, the intrinsic viscosity [.eta.] is 1.2 to 4.0 dl/g, the ratio Mw/Mn of the weight-average molecular weight [Mw] to the number-average molecular weight [Mn] is from 2 to 10, and the haze is 50% or below, and layers each provided on each of the opposite surfaces of said base layer and made of a polyolefin type resin having a melt index [MI] of 0.1 to 30 g/10 min, the haze of each of the latter layers being up to that of said base layer, characterized in that the haze of said laminate is 3% or below, the strain recovery rate is 90% or over and the ratio of the tear strength in the M. D. to the tear strngth in the T. D. is from 0.25 to 4.

Abstract: The present invention relates to a butene-1 copolymer composition which has excellent heat sealing properties, mechanical characteristics, moldability, and transparency without lowering its surface characteristics, and is characterized by containing 75 to 99.5% by weight of a butene-1 copolymer comprising butene-1 unit and .alpha.-olefine having a carbon number of 2 to 3, and 25 to 0.5% by weight of a propylene polymer, the said butene-1 copolymer has an .alpha.-olefine unit content of 1 to 35 mol %, intrinsic viscosity of 0.9 to 7.2 dl/g, weight-average molecular weight/number-average molecular weight of 4 to 15, and the content of the boiling diethyl ether soluble component is 3 to 15% by weight of the copolymer.

Abstract: The present invention relates to an olefin copolymer composition, which olefin copolymer composition contains (A) 25 to 97 wt. % of a propylene copolymer, and (B) 75 to 3 wt. % of a butene-1 copolymer having a content of .alpha.-olefin unit with 2 to 8 carbon atoms of 1 to 35 mol %, an intrinsic viscosity of 0.9 to 7.2 dl/g measured in decalin heated to 150.degree. C., a value of weight-average molecular weight/number-average molecular weight of 4 to 15, a temperature difference of 2.degree. to 40.degree. C. between the highest value and the lowest value of the melting point measured by the differential scanning calorimetric analysis, and a .alpha.-olefin block property of 0.015 or lower measured by the nuclear magnetic resonance spectral analysis, can provide molded items excellent, for example, in heat-sealing properties, transparency, blocking resistance, and surface gloss, and is good in processability.

Abstract: This invention provides a process for producing a blown film of butene-1 polymer excellent in elasticity, elastic recovery, impact strength and the like which includes extruding a butene-1 polymer having a melt index of 0.3-10 g/10 min in a tubular form from extrusion die at an extrusion temperature of 120.degree.-250.degree. C. and then inflation molding the tubular film under the conditions that frost line height is 38-100 cm, stretch ratio in machine direction is 5 or more and ratio of stretch ratio in machine direction/stretch ratio in transverse direction is 2.5 or more.

Abstract: The invention provides a novel resin composition of polymers of ethylene capable of giving a shaped article having outstandingly excellent mechanical properties but yet having very good processability or moldability. The resin composition is composed of 15-90% by weight of a homopolymer of ethylene and 85-10% by weight of a copolymer of ethylene and characterized by several parameters including the intrinsic viscosity, density and swelling ratio as well as satisfaction of the relationships between the melt index and the intrinsic viscosity and between the melt index and the melt tension expressed by the respective logarithmic equations. Industrially feasible processes for the preparation of such resin compositions are described in detail.