Patent ID: 6274678
Filing Date: 2001-08-14
Classification: C08F

Abstract:
A propylene block copolymer having such properties that.a melt flow rate (MFR) of said copolymer at 230.degree. C. under a load of 2.16 kg is in the range of 0.1 to 500 g/10 min,a pentad isotacticity M.sub.5 obtained from the following formula (1A) using absorption intensity Pmmmm, Pw, S.alpha..gamma., S.alpha..delta..sup.+ and T.delta..sup.+.delta..sup.+ in a .sup.13 C-NMR spectrum of a boiled heptane-insoluble component contained in said copolymer is in the range of 0.970 to 0.995,a pentad tacticity M.sub.3 obtained from the following formula (2A) using absorpiton intensity Pmmrm, Pmrmr, Pmrrr, Prmrr, Prmmr, Prrrr, Pw, S.alpha..gamma., S.alpha..delta..sup.+ and T.delta..sup.+.delta..sup.+ in a .sup.13 C-NMR spectrum of a boiled heptane-insoluble component contained in said copolymer is in the range of 0.0020 to 0.0050, anda crystallinity of a boiled heptane-insoluble component contained in said copolymer is 68 to about 79.3% ##EQU12##whereinPmmmm is absorption intensity of methyl groups present in the third unit among continuous five propylene units which are bonded to each other with meso form,Pw is absorption intensity of all methyl groups in a propylene unit,S.alpha..gamma. is absorption intensity of such secondary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said secondary carbons one is situated at the .alpha. position and the other is situated at the .gamma. position,S.alpha..delta..sup.+ is absorption intensity of such secondary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said secondary carbons one is situated at the .alpha. position and the other is situated at the .delta. position or farther than the .delta. position, andT.delta..sup.+.delta..sup.+ is absorption intensity of such tertiary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said tertiary carbons one is situated at the .delta. position or farther than the .delta. position and the other is also situated at the .delta. position or farther than the .delta. position; ##EQU13##whereinPmmrm is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by .sup..right brkt-bot..right brkt-bot..right brkt-bot..right brkt-top..right brkt-top. in which .right brkt-bot. and .right brkt-top. are each a propylene unit,Pmrmr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by .sup..right brkt-bot..right brkt-bot..right brkt-top..right brkt-top..sup..right brkt-bot. in which .right brkt-bot. and .right brkt-top. are each a propylene unit,Pmrrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by .sup..right brkt-bot..right brkt-bot..right brkt-top..sup..right brkt-bot..right brkt-top. in which .right brkt-bot. and .right brkt-top. are each a propylene unit,Prmrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by .right brkt-top..sup..right brkt-bot..right brkt-bot..right brkt-top..sup..right brkt-bot. in which .right brkt-bot. and .right brkt-top. are each a propylene unit,Prmmr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by .right brkt-top..sup..right brkt-bot..right brkt-bot..right brkt-bot..right brkt-top. in which .right brkt-bot. and .right brkt-top. are each a propylene unit,Prrrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by .sup..right brkt-bot..right brkt-top..sup..right brkt-bot..right brkt-top..sup..right brkt-bot. in which .right brkt-bot. and .right brkt-top. are each a propylene unit,Pw, S.alpha..gamma., S.alpha..delta..sup.+ and T.delta..sup.+.delta..sup.+ have the same meanings as defined in the above formula (1A), andwherein said propylene block copolymer contains 10-10,000 ppm of polymer comprising constituent units derived from a compound represented by the following formula (i) or (ii):H.sub.2 C.dbd.CH--X (i)H.sub.2 C.dbd.CH--CH.sub.2 --X (ii)wherein X is a cycloalkyl group, an aryl group or ##STR20##M is carbon or silicon, R.sup.1 and R.sup.2 are each a hydrocarbon group, and R.sup.3 is hydrogen or a hydrocarbon group.