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EP0037291A2
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Improved process for the production of a propylene-containing block copolymer
Assignee: Mitsui Chemicals Inc
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Filing: 1981-04-02
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Granted: —
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Expires: 2001-04-02
Abstract
Abstract in a multi-step process for the production of a propylene-containing block copolymerwhich comprises (I) polymerizing propylene or propylene with up to about 5 mole % of another olefin by suspension polymerization in the presence of a catalyst composed of (A) a highly active solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor as essential ingredients, (B) anorganoaluminumcompound, and (C) an electron donor, and (II) copolymerizing propylene with at least one olefin by gas-phase polymerization in the presence of the catalyst-containing polymer obtained in step (I); the improvement wherein (i) step (I) is carried out under such conditions that the mole ratio of Al to the electron donor in the catalyst components (B) and (C) is from about 1 to about 15, and (ii) after the amount of the polymer formed in step (I) reaches 70% of that of the polymer finally obtained in step (I), component (B) or both components (B) and (C) are freshly added in such an amount that the mole ratio of Alto the total electron donor in the polymerization or copolymerization system is from about 01 to about 20, and thereafterthe polymerization or copolymerization is carried out in the further presence of the component (B) or the components (B) and (C) so added.
Inventors
- 👤 Akinori Toyota
- 👤 Norio Kashiwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:49
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
211 words
A multi-step process for the production of a propylene-containing block copolymer which comprises (I) polymerizing propylene, either alone or with up to 5 mole% of another olefin, by suspension polymerization in the presence of a catalyst composed of (A) a highly active solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor as essential ingredients, (B) an organoaluminum compound, and (C) an electron donor, and (II) copolymerizing propylene with at least one olefin by gas-phase polymerization in the presence of the catalyst-containing polymer obtained in step (I); characterised in that (i) step (I) is carried out under such conditions that the mole ratio of Al to the electron donor in the catalyst components (B) and (C) is from 1:1 to 15:1, and (ii) after the amount of the polymer formed in step (I) reaches 70% of that of the polymer finally obtained in step (I), component (B) or both components ( B ) and (C) are freshly added in such an amount that the mole ratio of Al to the total electron donor in the polymerization or copolymerization system is from 0.1:1 to 20:1, and thereafter the polymerization or copolymerization is carried out in the further presence of the component (B) or the components (B) and (C) so added.
Claim 2
Dependent Claim
211 words
A multi-step process for the production of a propylene-containing block copolymer which comprises (I) polymerizing propylene, either alone or with up to 5 mole% of another olefin, by suspension polymerization in the presence of a catalyst composed of (A) a highly active solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor as essential ingredients, (B) an organoaluminum compound, and (C) an electron donor, and (II) copolymerizing propylene with at least one olefin by gas-phase polymerization in the presence of the catalyst-containing polymer obtained in step (I); characterised in that (i) step (I) is carried out under such conditions that the mole ratio of Al to the electron donor in the catalyst components (B) and (C) is from 1:1 to 15:1, and (ii) after the amount of the polymer formed in step (I) reaches 70% of that of the polymer finally obtained in step (I), component (B) or both components ( B ) and (C) are freshly added in such an amount that the mole ratio of Al to the total electron donor in the polymerization or copolymerization system is from 0.1:1 to 20:1, and thereafter the polymerization or copolymerization is carried out in the further presence of the component (B) or the components (B) and (C) so added.
Claim 3
Dependent Claim
42 words
A process according to claim 1 wherein the average particle size of the solid titanium catalyst component (A) is 1 to 200 microns, and the geometrical standard deviation (dg) of the particle size distribution of the component (A) is less than 2.1.
Claim 4
Dependent Claim
49 words
3 . A process according to claim 1 or 2 wherein the suspension-polymerization of step (I) is carried out under such conditions that the amount of propylene in the liquid phase of thepolymerization system is not less than 50% by weight based on the weight of the liquid phase.
Claim 5
Dependent Claim
61 words
A process according to claim 1, 2 or 3 wherein the suspension polymerization of step (I) is carried out such that it yields at least 5000 g, per millimole of titanium, of a propylene polymer having a boiling n-heptane- insoluble portion content of at least 90% by weight and an n-decane-soluble portion content at 23°C of at least 5% by weight.
Claim 6
Dependent Claim
58 words
A process according to any one of the preceding claims wherein the gas-phase copolymerization of step (II) is carried out such that it yields a propylene-containing block copolymer having an intrinsic viscosity, measured at 135°C in decalin, of 1.8 to 6, of which the n-decane-soluble portion at 23°C has a propylene content of 20 mole% to 80 mole%.
Claim 7
Dependent Claim
26 words
A process according to any one of the preceding claims wherein the propylene-containing block copolymer has a propylene content of about 60 to about 96 mole%.
Claim 8
Dependent Claim
25 words
A process according to any one of the preceding claims wherein the gas-phase copolymerization of step (II) is carried out in the presence of hydrogen.
Claim 9
Dependent Claim
53 words
A process according to any one of the preceding claims wherein in the solid titanium catalyst component (A) the atomic ratio of Mg/Ti is from 2:1 to 100:1, the atomic ratio of halogen/Ti is from 4:1 to 100:1, and the mole ratio of the electron donor to Ti is from 0.2:1 to 10:1.
Claim 10
Dependent Claim
26 words
A process according to any one of the preceding claims wherein the electron donor in the solid titanium catalyst component (A) is an organic acid ester.
Claim 11
Dependent Claim
23 words
1 0 . A process according to any one of the preceding claims wherein the electron donor (C) is an organic acid ester.
Claim 12
Dependent Claim
24 words
A process according to any one of the preceding claims wherein step (I) and/or step (II) is carried out in at least two stages.
Claim 13
Dependent Claim
37 words
A process according to any one of the preceding claims wherein a step of homopolymerizing propylene in the gaseous phase, and/or a step of homopolymerizing ethylene in the gaseous phase is included before and/or after step (II).
References Cited (Backward Citations)
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