C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/403, 402/418
C08F 210/16 (2006.01)
Patent
CA 1240097
ABSTRACT OF THE DISCLOSURE A copolymer of ethylene with at least one C4-C20 .alpha.-olefin having the following characteristics (A) to (J): (A) it has a melt flow rate of from 0.01 to 200 g/10 min., (B) it has a density (d) of from 0.850 to 0.930 g/cm3, (C) it has a composition distribution parameter (U) of not more than 50, (D) the amount of components having a degree of branch- ing of not more than 2/1000 carbons is more than 10% by weight based on the ethylene copolymer, (E) the amount of components having a degree of branch- ing of at least 30/1000 carbons is not more than 70% by weight based on the ethylene copolymer, (F) the ratio of the average block methylene chain length to the average methylene chain length is not more than 2.0, (G) it has n melting points measured by a differential scanning calorimeter (DSC) (where n=1 or n?3), in which the highest melting point (T1) among these DSC melting points is given by the following expression (i) (175 x d - 46)°C?T1?125°C (i), the difference between T1 and the lowest melting point (Tn) among the DSC melting points is given by the following expression (ii) 18°C<T1 - Tn?65°C (ii), and the difference between T1 and the second high- est melting point (T2) is given by the following expression (iii) 0°C<T1 - T2?20°C (iii), (H) when n?3 in the characteristic (G) above, 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 the following expression 0<H1/HT?0.40, (I) it has a crystallinity of from 15 to 70%, and (J) it has a molecular weight distribution ?w/?n of from 2.5 to 10.
465836
Inoue Hiroshi
Sakai Masayuki
Tominari Kenichi
Mitsui Chemicals Incorporated
Smart & Biggar
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