The present invention relates to an olefin derived copolymer and a
thermoplastic resin composition using the olefin derived copolymer
satisfying the following (1) and (2): (1) tensile strength at break
measured based on JIS K6251 is 2.0 or less MPa; and (2) tensile elongation
at break EB (%) of a resin composition obtained satisfies the following
relational expression (expression 1) and (expression 2), when blended with
a polypropylene derived resin that has 20 degree C. xylene soluble
component of not more than 20 wt %.
R[3/5]-R[2/6].gtoreq.0.15 (expression 1)
S[2/6].gtoreq.-800 (expression 2)
(R[3/5] and R[2/6] are obtained by the following methods: a curve is
obtained by plotting tensile elongation at break EB (%) (based on JIS
K6251) of resin composition taken as vertical axis, and weight part rate
Pa of a content of an olefin derived copolymer contained in a resin
composition taken as horizontal axis; a multiple regression curve in
section regions of Pa=0.30-0.50 and Pa=0.20-0.60 (Pa represents content
weight percentage of an olefin derived copolymer contained in a resin
composition) of a multiple regression expression obtained by quintic
multiple regression of the curve is obtained; R[3/5] and R[2/6] are
defined as multiple correlation coefficients of a primary straight line
obtained by approximating of the multiple regression curve by method of
least squares. S[2/6] represent a gradient of a primary straight line
(expression) obtained by approximating the above-mentioned multiple
regression curve by a method of least squares in section region of
Pa=0.20-0.60. In addition, in the above-mentioned multiple regression
expression, it is indispensable that data at least seven points Pa=0.00,
0.20, 0.30, 0.40, 0.50, 0.60 and 0.70 are contained. Furthermore, when
data at points of number beyond above case are contained, it is
indispensable that total Pa values exist at 0.10 or less of fixed interval
mutually.
