EP0094818A2
Expired / Lapsed
EP
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Propylene-ethylene copolymers for high-rigidity moulded products and process for producing the copolymers
Assignee: JNC Corp
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Filing: 1983-05-16
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Granted: —
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Expires: 2003-05-16
Abstract
Abstract A propylene-ethylene block copolymer from which molded products having high rigidity and superior high-impact properties can be prepared even without adding any particular additive, is provided, which copolymer is obtained by (i) polymerizing propylene in 70 to 95 weight % based on the total polymerized amount, using a catalyst obtained by reacting an organoaluminum compound (1) or a reaction product of (1) with an electron donor (A), with TiCℓ 4 , further reacting the resulting solid product (II) with (A) and an electron acceptor (B), and combining the resulting solid product (III) with an organoaluminum compound (IV) and an aromatic carboxylic acid ester (V), the molar ratio of (V) to (III) being 0.1 to 10.0, and then (ii) polymerizing ethylene or ethylene and propylene in 30 to 5 weight % based on the total polymerized amount, at one or more stages, using the same catalyst as above, the ethylene content being 3 to 20 weight % based on the total polymerized amount.
Inventors
- 👤 Hiromasa Chiba
- 👤 Katsumi Kumahara
- 👤 Takakiyo Harada
- 👤 Takahiro Oka
- 👤 Akihiro Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 04:44
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
179 words
A propylene-ethylene block copolymer for high-rigidity moulded products, obtained by (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized material, in the presence of a catalyst obtained by reacting with TiCl 4 (C) an organoaluminium compound (I) or a reaction product of an organoaluminium compound (I) with an electron donor (A), further reacting the resulting solid product ( II ) with an electron donor (A) and an electron acceptor (B), and combining the resulting solid product (III) with an organoaluminium compound (IV) and an aromatic carboxylic acid ester (V), the molar ratio of said aromatic carboxylic acid ester (V) to said solid product (I I I) being in the range of 0.1:1 to 10.0:1, and then (ii) polymerizing ethylene or ethylene and propylene in an amount of 30 to 5% by weight based on the total polymerized amount, at one or more stages, in the presence of the same catalyst as above, the ethylene content being in the range of 3 to 20% by weight based on the total polymerized material.
Claim 2
Dependent Claim
179 words
A propylene-ethylene block copolymer for high-rigidity moulded products, obtained by (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized material, in the presence of a catalyst obtained by reacting with TiCl 4 (C) an organoaluminium compound (I) or a reaction product of an organoaluminium compound (I) with an electron donor (A), further reacting the resulting solid product ( II ) with an electron donor (A) and an electron acceptor (B), and combining the resulting solid product (III) with an organoaluminium compound (IV) and an aromatic carboxylic acid ester (V), the molar ratio of said aromatic carboxylic acid ester (V) to said solid product (I I I) being in the range of 0.1:1 to 10.0:1, and then (ii) polymerizing ethylene or ethylene and propylene in an amount of 30 to 5% by weight based on the total polymerized amount, at one or more stages, in the presence of the same catalyst as above, the ethylene content being in the range of 3 to 20% by weight based on the total polymerized material.
Claim 3
Dependent Claim
15 words
A copolymer according to claim 1 wherein the organoaluminium compound (IV) is a dialkylaluminium monohalide.
Claim 4
Dependent Claim
33 words
A copolymer according to claim 1 or 2 wherein the aromatic carboxylic acid ester is at least one of methyl p-toluylate, ethyl p-toluylate, butyl p-toluylate, methyl benzoate, ethyl benzoate, methyl p-anisate and p-anisate.
Claim 5
Dependent Claim
55 words
A copolymer according to claim 1, 2 or 3 wherein said solid product (III) is combined with said organoaluminium compound (IV) and the resulting combination is preactivated with a small amount of an α-olefin and then combined with said aromatic carboxylic acid ester (V) to obtain a catalyst (VII) to be used for said polymerizations.
Claim 6
Dependent Claim
53 words
A copolymer according to any preceding claim, wherein the second stage and any subsequent copolymerization is carried out using a polymer mixture obtained at the first stage of the copolymerization, having a relationship of the isotactic pentad ratio ( P ) of polypropylene therein with it MFR, of 1.00>P>0.015 log MFR + 0.955.
Claim 7
Dependent Claim
183 words
A process for producing a propylene-ethylene block copolymer for high-rigidity moulded products, which process comprises (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized material, in the presence of a catalyst obtained by reacting an organoaluminium compound (I) or a reaction product of an organoaluminium compound (I) with an electron donor (A), with TiCl 4 (C), further reacting the resulting solid product (II) with an electron donor (A) and an electron acceptor (B), and combining the resulting solid product (III) with an organoaluminium compound (IV) and an aromatic carboxylic acid ester ( V ), the molar ratio of said aromatic carboxylic acid ester ( V ) to said solid product (III) being in the range of,0.1:1 to 10.0:1, and then (ii) polymerizing ethylene or ethylene and propylene in an.amount of 30 to 5% by weight based on the total polymerized amount, at one or more stages, in the presence of the same catalyst as above, to obtain an ethylene content in the range of 3 to 20% by weight based on the total polymerized material.
Claim 8
Dependent Claim
183 words
A process for producing a propylene-ethylene block copolymer for high-rigidity moulded products, which process comprises (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized material, in the presence of a catalyst obtained by reacting an organoaluminium compound (I) or a reaction product of an organoaluminium compound (I) with an electron donor (A), with TiCl 4 (C), further reacting the resulting solid product (II) with an electron donor (A) and an electron acceptor (B), and combining the resulting solid product (III) with an organoaluminium compound (IV) and an aromatic carboxylic acid ester ( V ), the molar ratio of said aromatic carboxylic acid ester ( V ) to said solid product (III) being in the range of,0.1:1 to 10.0:1, and then (ii) polymerizing ethylene or ethylene and propylene in an.amount of 30 to 5% by weight based on the total polymerized amount, at one or more stages, in the presence of the same catalyst as above, to obtain an ethylene content in the range of 3 to 20% by weight based on the total polymerized material.
Claim 9
Dependent Claim
15 words
A process according to claim 6 wherein said organoaluminium compound (IV) is a dialkylaluminium monohalide.
Claim 10
Dependent Claim
33 words
A process according to claim 6 or 7 wherein said aromatic carboxylic acid ester is at least one of methyl p-toluylate, ethyl p-toluylate, butyl p-toluylate, methyl benzoate, ethyl benzoate, methyl p-anisate and p-anisate.
Claim 11
Dependent Claim
55 words
A process according to claim 6, 7 or 8 wherein said solid product (III) is combined with said organoaluminium compound (IV) and the resulting combination is preactivated with a samll amount of an Of-olefin and then combined with said aromatic carboxylic acid ester (V) to obtain a catalyst (VII) to be used for said polymerizations.
Claim 12
Dependent Claim
54 words
A process according to any of claims 6 to 9 wherein the second and any subsequent stage copolymerization is carried out using a polymer mixture obtained at the first stage of the copolymerization, having a relationship of the isotactic pentad ratio (P) of polypropylene therein with its MFR, of 1.00>P>0.015 log MFR + 0.955.
References Cited (Backward Citations)
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