C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/418, 402/581
C08F 4/64 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01)
Patent
CA 1217899
ABSTRACT OF THE DISCLOSURE An ethylene copolymer having the following character- istics (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/cm3; (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 hav- ing a degree of branching of not more than 2/1000 carbons is 15% by weight based on the ethylene copolymer; (E) the amount of com- ponents 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)°C ~ 125°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°C < T1 - Tn < 18°C; and the difference between T1 and the second highest melting point T2 is given by 0°C < T1 - T2 < 5°C, provided that when there are two (n=2) DSC melting points, the difference is in accordance with the above expression 0°C < T1 - Tn < 18°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.
439674
Kohyama Masaki
Motooka Masanori
Ueda Takashi
Mitsui Chemicals Incorporated
Smart & Biggar
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