Patent ID: 6407168
Filing Date: 2002-06-18
Classification: B29C,C08F,C08J,C08L

Abstract:
A composition, comprising components (A-1) and (A-2) wherein(A-1) comprises from 60 to 80% by mass of a propylene homopolymer and/or a propylene-ethylene block copolymer having properties (a1) to (a5): (a1) the amount of its xylene-insoluble ingredient falls between 90 and 100% by mass based on the total mass of component (A-1); (a2) its ingredient that is insoluble both in xylene and in boiling n-heptane has a stereospecificity index of at least 96.5% wherein the stereospecificity index is detennined by the following formula LmmmmÃ—100/(Lmmmm+Lmmmr+Lmmrr+L(mmrm+rrmr)+Lrrr+Lmrrm) â€ƒwherein Lmmmm, Lmmmr, Lmmrr, L(mmrm+rrmr), Lrrrr, and Lmrrm indicate the height from the baseline of six peaks for mmmm, mmmmr, mmrr, (mmrm+rrmr), rrrr, and mrrm, respectively, in a 13C-NMR spectrum of the 25Â° C. xylene-insoluble ingredient; (a3) its ingredient that is insoluble both in xylene and in boiling n-heptane has an intrinsic viscosity [&eegr;]1-C falling between 0.6 and 1.1 dl/g wherein the intrinsic viscosity is measured at 135Â° C. in tetralin; (a4) when component (A-1) comprises a propylene-ethylene block copolymer, the ethylene content of its xylene-soluble ingredient falls between 15 and 45% by mass based on the total mass of component (A-1); and (a5) when component (A-1) comprises a propylene-ethylene block copolymer, the intrinsic viscosity [&eegr;]1-A of its xylene-soluble ingredient falls between 2.5 and 5.0 dl/g with [&eegr;]1-A/[&eegr;]1-C<6.5 wherein the intrinsic viscosity is measured at 135Â° C. in tetralin; and (A-2) comprises from 20 to 40% by mass of a propylene-ethylene block copolymer having properties (aâ€²1) to (aâ€²5): (aâ€²1) the amount of its xylene-insoluble ingredient falls between 70 and 90% by mass based on the total mass of component (A-2); (aâ€²2) its ingredient that is insoluble both in xylene and in boiling n-heptane has a stereospecificity index of at least 96.5% â€ƒwherein the stereospecificity index is determined by the following formula LmmmmÃ—100/(Lmmmm+Lmmmr+Lmmrr+L(mmmr+rrmr)+Lrrrr+Lmrrm) â€ƒwherein Lmmmm, Lmmmr, Lmmrr, L(mmrm+rrmr), Lrrrr, and Lmrrm indicate the height from the baseline of six peaks for mmmm, mmmr, mmrr, (mmrm+rmr), rrrr, and mrrm, respectively, in a 13C-NMR spectrum of the 25Â° C. xylene-insoluble ingredient; (aâ€²3) its ingredient that is insoluble both in xylene and in boiling n-heptane has an intrinsic viscosity [&eegr;]2-C falling between 1.1 and 1.8 dl/g â€ƒwherein the intrinsic viscosity is measured at 135Â° C. in tetralin; (aâ€²4) The ethylene content of its xylene-soluble ingredient falls between 15 and 45% by mass based on the total mass of component (A-2); and (aâ€²5) The intrinsic viscosity [&eegr;]2-A of its xylene-soluble ingredient falls between 6.0 and 10.0 dl/g with 4.02-A/[&eegr;]2-C<6.5 â€ƒwherein the intrinsic viscosity is measured at 135Â° C. in tetralin.