Patent US3429610A successfully refreshed from Google Patents.
Patent US4491652A successfully refreshed from Google Patents.
US4491652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequentially prepared thermoplastic elastomer and method of preparing same
Assignee: Uniroyal Chemical Co Inc
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Filing: 1982-04-29
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Granted: 1985-01-01
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Expires: 2002-04-29
Abstract
Abstract Thermoplastic elastomeric sequentially prepared propylene and (ethylene-propylene) polymer, or propylene, (ethylene-propylene) and propylene polymer, made in solvent medium with catalyst system based on (a) complex of titanium tetrachloride and alkyl benzoate or a phenol, supported on magnesium dihalide and (b) trialkyl aluminum modified by electron rich substituted benzoate.
Inventors
- 👤 Demetreos N. Matthews
- 👤 Walter Nudenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:19
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
139 words
A method of making a thermoplastic elastomeric sequential polymer comprising (a) contacting propylene under polymerization conditions with a polymerization catalyst system which produces polypropylene in which at least some of the polymer molecules have living polymer ends with a short life, said catalyst system comprising a catalyst which is titanium halide or a complex thereof with an electron donor supported on a magnesium or manganese halide and a cocatalyst which is an organo aluminum compound or a substitution product or addition product thereof with an electron donor, thereafter (b) adding ethylene and propylene to the polymerization mixture to form amorphous ethylene-propylene copolymer segments sequentially therein, the resulting polymer having (A) crystalline polypropylene segments of isotactic polypropylene and (B) amorphous segments of elastomeric ethylene-propylene, the weight ratio (A) to (B) segments being within the range of from 10:90 to 75:25.
Claim 2
Independent Claim
139 words
A method of making a thermoplastic elastomeric sequential polymer comprising (a) contacting propylene under polymerization conditions with a polymerization catalyst system which produces polypropylene in which at least some of the polymer molecules have living polymer ends with a short life, said catalyst system comprising a catalyst which is titanium halide or a complex thereof with an electron donor supported on a magnesium or manganese halide and a cocatalyst which is an organo aluminum compound or a substitution product or addition product thereof with an electron donor, thereafter (b) adding ethylene and propylene to the polymerization mixture to form amorphous ethylene-propylene copolymer segments sequentially therein, the resulting polymer having (A) crystalline polypropylene segments of isotactic polypropylene and (B) amorphous segments of elastomeric ethylene-propylene, the weight ratio (A) to (B) segments being within the range of from 10:90 to 75:25.
Claim 3
Dependent Claim
21 words
A method as in claim 1 in which the polypropylene segments (A) comprise 15-70% by weight of the total polymerized propylene.
Claim 4
Dependent Claim
24 words
A method as in claim 1 in which less than 50% by weight of the propylene charged in step (a) is converted to polypropylene.
Claim 5
Dependent Claim
24 words
A method as in claim 1 in which not more than 30% by weight of the propylene charged step (a) is converted to polypropylene.
Claim 6
Dependent Claim
42 words
A method as in claim 1 wherein said catalyst is the reaction product of titanium tetrachloride with an alkyl benzoate supported on an anhydrous magnesium dihalide; and said cocatalyst is a trialkyl aluminum modified by reaction with an electron rich substituted benzoate.
Claim 7
Dependent Claim
40 words
A method as in claim 1 wherein said catalyst is the reaction product of titanium tetrachloride with phenol supported on an anhydrous magnesium dihalide; and said cocatalyst is a trialkyl aluminum modified by reaction with an electron rich substituted benzoate.
Claim 8
Dependent Claim
114 words
A method as in claim 5 in which (a) is ground to a particle size below 1 micron, the alkyl benzoate is ethyl benzoate, the magnesium dihalide is magnesium dichloride, the trialkyl aluminum is triethyl aluminum, the electron-rich substituted benzoate is ethyl anisate or ethyl p-t-butyl benzoate, the molar ratio of titanium tetrachloride to alkyl benzoate in the catalyst (a) is 1.1 to 1, the weight ratio of MgCl 2 to complexed titanium compound is at least 4 to 1, the molar ratio of trialkyl aluminum to benzoate in the cocatalyst (b) is from 2:1 to 10:1 and the molar ratio of aluminum to titanium is from 50 to 1 to 200 to 1.
Claim 9
Dependent Claim
17 words
A method as in claim 7 in which the said electron-rich substituted benzoate is ethyl p-t-butyl benzoate.
Claim 10
Dependent Claim
84 words
A method as in claim 6 in which (a) is ground to a particle size below 1 micron, the magnesium dihalide is magnesium dichloride, the phenol is phenol itself, the trialkyl aluminum is triethyl aluminum, the electron-rich substituted benzoate is ethyl anisate or ethyl p-t-butylbenzoate, the weight ratio of magnesium dichloride to phenol is from 4:1 to 100:1, the molar ratio of magnesium dichloride to titanium tetrachloride is from 2000:1 to 14:1, and the mole ratio of aluminum to titanium is at least 2:1.
Claim 11
Dependent Claim
29 words
A method as in claim 7 in which the polymerization temperature is from 20° to 80° C. in step (a) and from -10° to 80° C. in step (b).
Claim 12
Dependent Claim
30 words
A method as in claim 1 including the additional step, step (c), of adding propylene to the reaction mixture whereby the resulting polymer includes additional crystalline segments of isotactic polypropylene.
Claim 13
Dependent Claim
37 words
A method as in claim 11 in which the polymerization temperature is from 55° to 77° C. in step (a), from 60° to 77° C. in step (b) and from 60° to 77° C. in step (c).
Claim 14
Dependent Claim
29 words
A method as in claim 9 in which the polymerization temperature is from 20° to 80° C. in step (a) and from -10° to 80° C. in step (b).
Claim 15
Dependent Claim
37 words
A method as in claim 11 in which the polymerization temperature is from 55° to 77° C. in step (a), from 60° to 77° C. in step (b) and from 60° to 77° C. in step (c).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |