US4550144A — Propylene-ethylene copolymers for high-rigidity m…

Claim 1

Independent Claim 200 words

A propylene-ethylene block copolymer for high-rigidity molded products, obtained by (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized amount, in the presence of a catalyst obtained by reacting an organoaluminum compound (I) or a reaction product of an organoaluminum 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 organoaluminum compound (IV) and an aromatic carboxylic acid ester (V), the aromatic carboxylic acid ester (V) and the organoaluminum compound (IV) having not been previously reacted together prior to being combined with solid product (III), the molar ratio of said aromatic carboxylic acid ester (V) to said solid product (III) being in the range of 0.1 to 10.0, 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 amount.

Claim 2

Dependent Claim 200 words

A propylene-ethylene block copolymer for high-rigidity molded products, obtained by (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized amount, in the presence of a catalyst obtained by reacting an organoaluminum compound (I) or a reaction product of an organoaluminum 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 organoaluminum compound (IV) and an aromatic carboxylic acid ester (V), the aromatic carboxylic acid ester (V) and the organoaluminum compound (IV) having not been previously reacted together prior to being combined with solid product (III), the molar ratio of said aromatic carboxylic acid ester (V) to said solid product (III) being in the range of 0.1 to 10.0, 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 amount.

Claim 3

Dependent Claim 15 words

A copolymer according to claim 1 wherein said organoaluminum compound (IV) is a dialkyl-aluminum monohalide.

Claim 4

Dependent Claim 38 words

A copolymer according to claim 1 wherein said aromatic carboxylic acid ester is at least one member selected from the group consisting of methyl p-toluylate, ethyl p-toluylate, butyl p-toluylate, methyl benzoate, ethyl benzoate, methyl p-anisate and ethyl p-anisate.

Claim 5

Dependent Claim 52 words

A copolymer according to claim 1 wherein said solid product (III) is combined with said organoaluminum 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 47 words

A copolymer according to claim 1 wherein the second et seq. 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.

Claim 7

Dependent Claim 206 words

A process for producing a propylene-ethylene block copolymer for high-rigidity molded products, which process comprises (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized amount, in the presence of a catalyst obtained by reacting an organoaluminum compound (I) or a reaction product of an organoaluminum 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 organoaluminum compound (IV) and an aromatic carboxylic acid ester (V), the aromatic carboxylic acid ester (V) and the organoaluminum compound (IV) having not been preivously reacted together prior to being combined with solid product (III), the molar ratio of said aromatic carboxylic acid ester (V) to said solid product (III) being in the range of 0.1 to 10.0, 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 amount.

Claim 8

Dependent Claim 206 words

A process for producing a propylene-ethylene block copolymer for high-rigidity molded products, which process comprises (i) polymerizing propylene in an amount of 70 to 95% by weight based on the total polymerized amount, in the presence of a catalyst obtained by reacting an organoaluminum compound (I) or a reaction product of an organoaluminum 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 organoaluminum compound (IV) and an aromatic carboxylic acid ester (V), the aromatic carboxylic acid ester (V) and the organoaluminum compound (IV) having not been preivously reacted together prior to being combined with solid product (III), the molar ratio of said aromatic carboxylic acid ester (V) to said solid product (III) being in the range of 0.1 to 10.0, 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 amount.

Claim 9

Dependent Claim 19 words

A process for producing a copolymer according to claim 6 wherein said organoaluminum compound (IV) is a dialkylaluminum monohalide.

Claim 10

Dependent Claim 42 words

A process for producing a copolymer according to claim 6 wherein said aromatic carboxylic acid ester is at least one member selected from the group consisting of methyl p-toluylate, ethyl p-toluylate, butyl p-toluylate, methyl benzoate, ethyl benzoate, methyl p-anisate and ethyl p-anisate.

Claim 11

Dependent Claim 56 words

A process for producing a copolymer according to claim 6 wherein said solid product (III) is combined with said organoaluminum 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 12

Dependent Claim 51 words

A process for producing a copolymer according to claim 6 wherein the second et seq. 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.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-10-28	1989-04-29	1989-10-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-10-28	1993-04-29	1993-10-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-10-28	1997-04-29	1997-10-29	$7700.00	Window Closed / Lapsed

Propylene-ethylene copolymers for high-rigidity molded products and process for producing the same

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