Patent ID: 6028121
Filing Date: 2000-02-22
Classification: C08J,C08L

Abstract:
Pre-expanded noncrosslinked polyethylene resin beads comprising a mixed resin comprising a high-pressure-process low-density polyethylene, a linear low-density polyethylene, and a linear high-density polyethylene, characterized in that when a result of measurement of said mixed resin with a differential scanning calorimeter (DSC) at a heating rate of 10.degree. C./min is expressed as a fusion endothermic curve, said fusion endothermic curve is a mountain-shaped curve having a single peak, and when a peak point of said mountain-shaped curve is referred to as A, a point of intersection of a perpendicular line drawn from A to the temperature axis and the base line of said fusion endothermic curve is referred to as B, a point interiorly dividing segment AB in said perpendicular line in a ratio of 9:1 is referred to as C, and two points at which a straight line drawn through C and parallel to the temperature axis intersects said fusion endothermic curve are referred to as D and E, a temperature width of said mountain-shaped curve part indicated by a length of segment DE is 15.degree. C. or more;wherein a linear high-density polyethylene (HD1) and a linear high-density polyethylene (HD2) are used as said linear high-density polyethylene, and said linear low-density polyethylene (LL) and said linear high-density polyethylenes (HD1) and (HD2) satisfy the following expression:(mHD2+mLL)/2-2.ltoreq.mHD1.ltoreq.(mHD2+mLL)/2+2(wherein mLL, mHD1, and mHD2 represent melting points of said linear low-density polyethylene (LL), said linear high-density polyethylene (HD1), and said linear high-density polyethylene (HD2), respectively).