JP-2025516866-A5 -

Dates

Publication Date

20260511

Application Date

20230519

Description

[0207] Other embodiments are described in the following claims. The present invention includes the following embodiments. [1] A polypropylene composition, (a) A first polymer phase comprising a polypropylene homopolymer or random copolymer, wherein the polypropylene homopolymer or random copolymer optionally contains one or more comonomers in an amount of about 3% by weight or less based on the total weight of the propylene homopolymer or copolymer, has a total low-temperature xylene soluble content of about 2% by weight to about 6% by weight, and has a melt flow rate of about 0.5 g/10 min to about 3 g/10 min, (b) A second polymer phase comprising a propylene/ethylene copolymer, wherein the propylene/ethylene copolymer contains less than 18% by weight of ethylene based on the total weight of the propylene/ethylene copolymer. Includes, The ratio of the melt flow rate of the polypropylene homopolymer or random copolymer to the melt flow rate of the propylene/ethylene copolymer is greater than approximately 1.0. The present invention provides a polypropylene composition in which the first polymer phase and the second polymer phase combine to have a melt flow rate of about 4 g/10 min or less, an ethylene content of less than 5% by weight, a total low-temperature xylene soluble content of about 5% to 20% by weight, a haze of less than 20% at 1 mm, an Izod impact strength at 23°C exceeding about 500 J/m, a Gardner drop impact strength at 0°C exceeding about 17 Nm (150 inch-pounds), and a flexural modulus of about 800 MPa or more. Polypropylene composition. [2] A polypropylene composition, (a) A first polymer phase comprising a polypropylene homopolymer or random copolymer, wherein the polypropylene homopolymer or random copolymer optionally contains one or more comonomers in an amount of about 1% by weight or less based on the total weight of the propylene homopolymer or copolymer, has a total low-temperature xylene soluble content of less than 4% by weight, and has a melt flow rate of about 2 g/10 min to about 5 g/10 min, (b) A second polymer phase comprising a propylene/ethylene copolymer, wherein the propylene/ethylene copolymer contains less than 18% by weight of ethylene based on the total weight of the propylene/ethylene copolymer. Includes, The ratio of the melt flow rate of the polypropylene homopolymer or random copolymer to the melt flow rate of the propylene/ethylene copolymer is greater than approximately 1.0. The present invention provides a polypropylene composition in which the first polymer phase and the second polymer phase combine to have a melt flow rate of about 5 g/10 min or less, an ethylene content of less than about 3.5% by weight, a total low-temperature xylene soluble content of about 5% to about 15% by weight, a haze of less than about 20% at 1 mm, an Izod impact strength at 23°C exceeding about 200 J/m, and a flexural modulus of about 1100 MPa or more. Polypropylene composition. [3] The polypropylene composition according to claim 1 or 2, wherein the first polymer phase comprises a crystalline matrix containing the polypropylene homopolymer or random copolymer. [4] A polypropylene composition according to any one of claims 1 to 3, comprising a heteromorphic propylene copolymer. [5] The polypropylene composition according to any one of claims 1 and 3 to 4, wherein the first polymer phase comprises a polypropylene homopolymer or random copolymer containing one or more comonomers in an amount of about 0% to about 3% by weight, based on the total weight of the propylene homopolymer or copolymer. [6] The polypropylene composition according to any one of claims 1 and 3 to 5, wherein the first polymer phase comprises the polypropylene homopolymer or random copolymer having a total low-temperature xylene soluble content of about 2.5% by weight or about 4.8% by weight. [7] The polypropylene composition according to any one of claims 1 and 3 to 6, wherein the first polymer phase comprises the polypropylene homopolymer or random copolymer having a melt flow rate of about 0.5 g/10 min to about 1.5 g/10 min. [8] A polypropylene composition according to any one of claims 1 and 3 to 7, having a melt flow rate of approximately 0.5 g/10 min to approximately 1.5 g/10 min. [9] A polypropylene composition according to any one of claims 1 and 3 to 8, having an ethylene content of approximately 2% to approximately 4.5% by weight. [10] A polypropylene composition according to any one of claims 1 and 3 to 9, having a total low-temperature xylene soluble content of about 7% by weight or about 12% by weight. [11] A polypropylene composition according to any one of claims 1 and 3 to 10, having a haze of approximately 5% to approximately 15% at 1 mm. [12] A polypropylene composition according to any one of claims 1 and 3 to 11, having an Izod impact strength of approximately 500 J/m to approximately 900 J/m at 23°C. [13] A polypropylene composition according to any one of claims 1 and 3 to 12, having a Gardner dr