Patent ID: 6642340
Filing Date: 2003-11-04
Classification: C08F,C08J,Y10S

Abstract:
An ethylene/&agr;-olefin copolymer which is a copolymer of ethylene and 1-hexene and has the following properties:(i) the density is in the range of 0.880 to 0.960 g/cm3, (ii) the melt flow rate at 190Â° C. under a load of 2.16 kg is in the range of 0.1 to 100 g/10 min, (iii) the melt tension (MT (g)) at 190Â° C. and the melt flow rate (MFR (g/20 min)) satisfy the relation MT&lE;2.2Ã—MFRâˆ’0.84, (iv) the quantity fraction (W (% by weight)) of a decane-soluble component of said copolymer at 23Â° C. and the density (d (g/cm3)) satisfy the relation in the case of MFR&lE;10 g/10 min:W<80Ã—exp(âˆ’100(dâˆ’0.88))+0.1, in the case of MFR&lE;10 g/10 min:W<80Ã—(MFRâˆ’9)0.26Ã—exp(âˆ’100(dâˆ’0.88))+0.1, (v) the temperature (Tm (Â° C.)) at the position of the maximum peak of an endotherm curve of said copolymer measured by a differential scanning calorimeter and the density (d (g/cm3)) satisfy the relation Tm<400Ã—dâˆ’248, (vi) the endotherm curve of said copolymer measured by a differential scanning calorimeter has two or more peaks, and the temperature (Tm1 (Â° C.)) at the position of the pea on the lowest temperature side, the temperature (Tm (Â° C.)) at the position of the maximum peak and the density (d (g/cm3)) satisfy the relation 576âˆ’600d>(Tmâˆ’Tm1)>558âˆ’600d, and(vii) a component, which is eluted at a temperature of not lower than 100Â° C. in a temperature rise elution test (TREF), exists in said copolymer, and the amount of the eluted component is not more than 10% of the total amount of the eluate.