Preparation method of masterbatch composition for thermoplastic resin modification

DETAILED DESCRIPTION What is claimed is: 1.
A method for the preparation of a masterbatch composition for use in thermoplastic resin modification which comprises kneading and extruding a component mixture in the temperature range from the maximum peak temperature (Tm) to (Tm-45).
degree.
C in accordance with differential scanning calorimetry (DSC) of an ethylene.
sup.
.
.
alpha.
-olefin copolymer, the component mixture comprising: (A) 30-95 parts by weight of the ethylene.
sup.
.
.
alpha.
-olefin copolymer obtained by copolymerizing ethylene with an .
alpha.
-olefin having 3-12 carbon atoms in the presence of a catalyst composed of an organic aluminum compound and a solid component containing at least magnesium and titanium, and characterized by the properties (I)-(IV): (I) Melt index of from 0.
01 to 100 g/10 min, (II) Density of more than 0.
910 g/cm.
sup.
3 and 0.
940 g/cm.
sup.
3 or less (III) Maximum peak temperature (Tm) of 100.
degree.
C or more in accordance with differential scanning calorimetry (DSC), and (IV) Boiling n-hexane insoluble matter of 10 wt % or more; and (B) 5-70 parts by weight of polybutene having a number average molecular weight of 300-4000.
2.
The method of claim 1 wherein said .
alpha.
-olefin in the ethylene.
sup.
.
.
alpha.
-olefin copolymer (A) has carbon atoms from 3 to 6.
3.
The method of claim 1 wherein the content of .
alpha.
-olefin in the ethylene.
sup.
.
.
alpha.
-olefin copolymer (A) is from 2 to 10 mol %.
4.
The method of claim 1 wherein said ethylene.
sup.
.
.
alpha.
-olefin copolymer (A) has a melt index of from 0.
1 to 50 g/10 min.
5.
The method of claim 1 wherein said ethylene.
sup.
.
.
alpha.
-olefin copolymer (A) has a density of from 0.
915 to 0.
940 g/cm.
sup.
3.
6.
The method of claim 1 wherein said ethylene.
sup.
.
.
alpha.
-olefin copolymer (A) has a Tm of from 110.
degree.
to 130.
degree.
C.
7.
The method of claim 1 wherein said ethylene.
sup.
.
.
alpha.
-olefin copolymer (A) has a boiling n-hexane insoluble matter of from 20 to 95% by weight.
8.
The method of claim 1 wherein said polybutene (B) has a number average molecular weight of from 400 to 3000