US 9,023,906 B2 · Propylene-based copolymer, propylene-based copolymer composition, molded product thereof and foamed product thereof, and production process therefor

Abstract

To provide a propylene-based copolymer and a propylene-based copolymer composition, each of which has a high melt tension because it has a long-chain branched structure, exhibits excellent molding processability during molding, such as inflation molding, extrusion molding, blow molding, injection molding or vacuum forming, and is capable of favorably providing a foamed product having an excellent expansion ratio and excellent cell uniformity in the foaming stage. The propylene-based copolymer (A) of the present invention comprises 50 to 95% by mol of constituent units [i] derived from propylene, 4.9 to 49.9% by mol of constituent units [ii] derived from an α-olefin of 2 to 10 carbon atoms other than propylene and 0.1 to 10% by mol of constituent units [iii] derived from a non-conjugated polyene (with the proviso that the total amount of the constituent units [i], [ii] and [iii] is 100% by mol), and is characterized by satisfying specific requirements (a) and (c).

Claims22

Dependent claims

A propylene-based copolymer (A) comprising 50 to 95% by mol of constituent units [i] derived from propylene, 4.9 to 49.9% by mol of constituent units [ii] derived from an α-olefin of 2 to 10 carbon atoms other than propylene and 0.1 to 10% by mol of constituent units [iii] derived from a non-conjugated polyene (with the proviso that the total amount of the constituent units [i], [ii] and [iii] is 100% by mol), and satisfying the following requirements (a) and (c):

(a) the intrinsic viscosity [η], as measured in decalin at 135° C., is 0.1 to 5.0 (dL/g.), and (c) the ratio (MFR10/MFR2.16) of MFR10, as obtained at 230° C. under a load of 10 kg in accordance with JIS K-6721, to MFR2.16, as obtained at 230° C. under a load of 2.16 kg in accordance with JIS K-6721, is 8.0 to 150.0.

A propylene-based copolymer composition (X1) comprising:

5 to 80 parts by weight of a propylene-based copolymer (A1) which satisfies the following requirements (a) to (d) and comprises 50 to 95% by mol of constituent units [i] derived from propylene, 4.9 to 49.9% by mol of constituent units [ii] derived from at least one α-olefin selected from ethylene, 1-butene, 4-methylpentene-1, 1-hexene and 1-octene and 0.1 to 10% by mol of constituent units [iii] derived from 5-vinyl-2-norbornene (with the proviso that the total amount of the constituent units [i], [ii] and [iii] is 100% by mol), and
95 to 20 parts by weight of polypropylene (B 1) (with the proviso that the total amount of the components (A1) and (B1) is 100 parts by weight),
said composition satisfying the following requirement (xa),
(a) the intrinsic viscosity [n], as measured in decalin at 135° C., is 0.1 to 5.0 (dL/g.),
(b) the ratio (Mz/Mw) of a z-average molecular weight (Mz), as measured by gel permeation chromatography (GPC), to a weight-average molecular weight (Mw), as measured by the same, is 3.0 to 20.0,
(c) the ratio (MFR10/MFR2.16) of MFR10, as obtained at 230° C. under a load of 10 kg in accordance with JIS K-6721, to MFR2.16, as obtained at 230° C. under a load of 2.16 kg in accordance with JIS K-6721, is 8.0 to 150.0,
(d) the ratio (η*(ω=0.1)/η*(ω=100)) of a complex viscosity η*(ω=0.1) at a frequency (ω=0.1 rad/s), as obtained by a linear viscoelasticity measurement (190° C.) using a rheometer, to a complex viscosity η*(ω=100) at a frequency (ω=100 rad/s), as obtained by the same, is 5 to 100, and
(xa) the ratio (MT(X1)/MT(B1)) of a melt tension MT(X1) of the propylene-based copolymer composition (X1) at 230° C. to a melt tension MT(B1) of the polypropylene (B1) at 230° C. is 2.0 to 10.0.

5 more elements

Dependencies are inferred from the claim text.

Propylene-based copolymer, propylene-based copolymer composition, molded product thereof and foamed product thereof, and production process therefor

Life of this patent

Propylene-based copolymer, propylene-based copolymer composition, molded product thereof and foamed product thereof, and production process therefor

Life of this patent

Abstract

Claims22