Patent US4383938A successfully refreshed from Google Patents.
US4383938A
Expired / Lapsed
US
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Catalyst system for olefinic polymerization
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1981-04-16
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Granted: 1983-05-17
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Expires: 2001-04-16
Abstract
Abstract A new improved catalyst system for alpha-olefin type polymerizations includes a metal di- or tri-halide compound of Al, Ga, or In and a diorganomagnesium compound in combination with a Group IVB-VIII transition metal compound. The improved catalyst system provides increased polymerization activity and polymers having a high degree of isotactic stereoregularity.
Inventors
- 👤 Arthur W. Langer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:55
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/02; C08F4/022; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
An improved catalyst composition adaptable for use in propylene polymerization for the production of polypropylene resin having less than about 11.0 weight percent heptane solubles which consists of a mixture of: (a) TiCl 4 supported on MgCl 2 , said TiCl 4 supported on MgCl 2 being prepared by dry ball milling a mixture of said MgCl 2 , said TiCl 4 and ethyl benzoate; (b) (s-Bu) 2 Mg; and (c) an alkyl aluminum dihalide having the formula RAlX 2 , wherein X is Cl or Br and R is an alkyl group having 2 to 8 carbon atoms, a molar ratio of said alkyl aluminum dihalide to said (s-Bu) 2 Mg being 0.5:1 to 2:1, and the molar ratio of said alkyl aluminum dihalide or said (s-Bu) 2 Mg to said TiCl 4 supported on said MgCl 2 , being less than 20:1.
Claim 2
Dependent Claim
144 words
An improved catalyst composition adaptable for use in propylene polymerization for the production of polypropylene resin having less than about 11.0 weight percent heptane solubles which consists of a mixture of: (a) TiCl 4 supported on MgCl 2 , said TiCl 4 supported on MgCl 2 being prepared by dry ball milling a mixture of said MgCl 2 , said TiCl 4 and ethyl benzoate; (b) (s-Bu) 2 Mg; and (c) an alkyl aluminum dihalide having the formula RAlX 2 , wherein X is Cl or Br and R is an alkyl group having 2 to 8 carbon atoms, a molar ratio of said alkyl aluminum dihalide to said (s-Bu) 2 Mg being 0.5:1 to 2:1, and the molar ratio of said alkyl aluminum dihalide or said (s-Bu) 2 Mg to said TiCl 4 supported on said MgCl 2 , being less than 20:1.
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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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |