Ethylene copolymer

Abstract

Abstract An ethylene copolymer having the following characteristics (A) to (I): (A) it has a melt flow rate of from 0.01 to 200 g/10 min.; (B) it has a density of from 0.900 to 0.945 g/cm<3>; (C) it has a composition distribution parameter (U), defined by the equation U = 100 x (Cw/Cn - 1) wherein Cw is the weight average degree of branching, and Cn is the number average degree of branching, of not more than 50; (D) the amount of components having a degree of branching of not more than 2/1000 carbons is 15% by weight based on the ethylene copolymer; (E) the amount of components having a degree of branching of at least 30/1000 carbons is not more than 15% by weight based on the ethylene copolymer; (F) the average chain length ratio of the methylene groups is not more than 2.0; (G) it has n melting points measured by a differential scanning calorimeter (DSC) (where n>/=2); the highest melting point (T1) among these DSC melting points is given by the equation T1 = (175 x d - 46) DEG C SIMILAR 125 DEG C(d is the density of the copolymer); the difference between T1 and the lowest melting point (Tn) among the DSC melting point is given by 0 DEG C < T1 - Tn </= 18 DEG C; and the difference between T1 and the second highest melting point T2 is given by 0 DEG C < T 1 - T2 </= 5 DEG C, provided that when there are two (n=2) DSC melting points, the difference is in accordance with the above expression 0 DEG C < T1 - Tn </= 18 DEG C; (H) the ratio of the amount of heat of crystal fusion (H1) at the highest melting point (T1) to the total amount of heat of crystal fusion (HT) is given by 0 < H1/HT </= 0.40, (I) it is a copolymer of ethylene with at least one C4-C20 alpha -olefin.

Inventors

• 👤 Masaki Kohyama
• 👤 Masanori Motooka
• 👤 Takashi Ueda

Bibliographic Details