Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
389 words
A copolymer of ethylene with at least one C 4 -C 20 α-olefin having the following characteristics (A) to (J): (A) it has a melt flow rate, determined by ASTM D 1238E, of from 0.01 to 200 g/10 min., (B) it has a density of from 0.850 to 0.930 g/cm 3 , (C) it has a composition distribution parameter (U), defined by the following equation (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 more than 10% 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 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=l or n>3), in which the highest melting point (T 1 ) among these DSC melting points is given by the following expression (i) wherein d is the density (g/cm j ) of the copolymer, the difference between T 1 and the lowest melting point (T ) among the DSC melting points is given by the following expression (ii) and the difference between T 1 and the second highest melting point (T 2 ) is given by the following expression (iii) provided that when the number of melting points is one (i.e., n=l), only the expression (i) is applicable and the expressions (ii) and (iii) are not applicable, (H) when n<3 in the characteristic (G) above, the ratio of the amount of heat of crystal fusion (H 1 ) at the highest melting point T 1 to the total amount of heat of crystal fusion (H T ) is given by the following expression (I) it has a crystallinity, measured by an X-ray diffraction method, of from 15 to 70%, and (J) it has a molecular weight distribution Mw/Mn where Mw is the weight average molecular weight of the copolymer and Mn is the number average molecular weight of the copolymer, measured by gel permeation chromatography, of from 2.5 to 10.
Claim 2
Dependent Claim
389 words
A copolymer of ethylene with at least one C 4 -C 20 α-olefin having the following characteristics (A) to (J): (A) it has a melt flow rate, determined by ASTM D 1238E, of from 0.01 to 200 g/10 min., (B) it has a density of from 0.850 to 0.930 g/cm 3 , (C) it has a composition distribution parameter (U), defined by the following equation (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 more than 10% 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 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=l or n>3), in which the highest melting point (T 1 ) among these DSC melting points is given by the following expression (i) wherein d is the density (g/cm j ) of the copolymer, the difference between T 1 and the lowest melting point (T ) among the DSC melting points is given by the following expression (ii) and the difference between T 1 and the second highest melting point (T 2 ) is given by the following expression (iii) provided that when the number of melting points is one (i.e., n=l), only the expression (i) is applicable and the expressions (ii) and (iii) are not applicable, (H) when n<3 in the characteristic (G) above, the ratio of the amount of heat of crystal fusion (H 1 ) at the highest melting point T 1 to the total amount of heat of crystal fusion (H T ) is given by the following expression (I) it has a crystallinity, measured by an X-ray diffraction method, of from 15 to 70%, and (J) it has a molecular weight distribution Mw/Mn where Mw is the weight average molecular weight of the copolymer and Mn is the number average molecular weight of the copolymer, measured by gel permeation chromatography, of from 2.5 to 10.
Claim 3
Dependent Claim
17 words
A copolymer according to claim 1 wherein the proportion of the -olefin is 0.5 to 40 mole%.
Claim 4
Dependent Claim
14 words
A copolymer according to claim 1 wherein the composition distribution parameter U is 0<U≤40.
Claim 5
Dependent Claim
13 words
Shaped articles of a copolymer as claimed in claim 1, 2 or 3.
Claim 6
Dependent Claim
39 words
Use of a copolymer as claimed in claim 1, 2 or 3 having a density of less than 0.90 g/cm 3 as a modifier for thermoplastic resins to improve their impact strength, low-temperature impact strength and low-temperature heat sealability.