Abstract: A branch distribution of a crystalline polymer is determined by melting the polymer at a temperature sufficiently higher than the melting point thereof, then cooling the melted polymer to room temperature in such a manner that isothermal crystallization of the polymer is allowed to take place stepwise at intervals of 3.degree. C. or higher at least from near the upper limit of the melting point of the polymer, then raising the temperature to melt the crystals and determining a branch distribution from the melt behavior, using a thermal analyzer.

Abstract: A multi-layered blow-molded bottle comprising at least two layers of a polyolefin resin (A), at least two layers of an adhesive resin (B) prepared by melt-reacting an olefin polymer (b.sub.1) with a rubber (b.sub.2) and an unsaturated carboxylic acid or a derivative thereof (b.sub.3) in the presence of an organic peroxide to obtain a product and adding a rubber (b.sub.4) to the product to melt-mix them with each other, and at least one layer of a barrier resin (C) selected from among polyamide, polycarbonate, polyester, polyvinylidene chloride and saponified ethylene-vinyl acetate polymer resins, which are laminated in the order of A/B/C/B/A.

Abstract: A multi-layered blow-molded bottle comprising at least two layers of a polyolefin resin (A), at least two layers of an adhesive resin (B) prepared by melt-reacting an olefin polymer (b.sub.1) with a rubber (b.sub.2) and an unsaturated carboxylic acid or a derivative thereof (b.sub.3) in the presence of an organic peroxide to obtain a product and adding a rubber (b.sub.4) to the product to melt-mix them with each other, and at least one layer of a barrier resin (C) selected from among polyamide, polycarbonate, polyester, polyvinylidene chloride and saponified ethylene-vinyl acetate polymer resins, which are laminated in the order of A/B/C/B/A.

Abstract: An ethylenic thermoplastic resin composition suitable for a heavy duty bag which comprises(a) 20-80% by weight of an ethylene/.alpha.-olefin copolymer having a density of 0.910 to 0.940 g/cm.sup.3.(b) 70-5% by weight of a copolymer of ethylene and a carboxyl group containing monomer or a derivative thereof; and(c) 50-5% by weight of an ethylene/.alpha.-olefin copolymer having(i) a density in the range of not lower than 0.860 g/cm.sup.3 to lower than 0.910 g/cm.sup.3,(ii) a maximum peak temperature not lower than 100.degree. C. as measured according to differential scanning calorimetry (DSC) and(iii) a boiling n-hexane insolubles content not smaller than 10% by weight,provided the total amount of the components (a), (b) and (c) is 100% by weight.