§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4483966A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for producing modified polypropylene

Assignee: JNC Corp
•
Filing: 1982-09-22
•
Granted: 1984-11-20
•
Expires: 2002-09-22
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A process for producing ethylene-propylene block copolymer by the use of a catalyst employed for producing isotactic polypropylene is provided. This process is characterized in that a gas phase polymerization of propylene is substantially carried out in the presence of the catalyst obtained by combining a titanium trichloride composition with an average particle size of 10˜100 μ and an organic aluminum to form the propylene polymer segment with a specific surface area more than 0.015 m 2 /g at a yield of more than 3,000 g per 1 g of the titanium trichloride composition in the first step, and then a gas phase polymerization of a mixture of polypropylene and ethylene is successively carried out in the second step to form the copolymer segment with a copolymerization ratio of propylene:ethylene being 5˜80 weight %:95˜20 weight %, wherein the polymerized amount of the second step is 10-40% of total polymerized amount and wherein normal hexane extraction ratio (75° C., 1 hour) of the ethylene-propylene block copolymer powders obtained is 1˜10 weight %. The process of the present invention is one having an extremely high productivity industrially, and the modified polypropylene obtained has a superior low-temperature-impact strength and brittle temperature.

Inventors

  • 👤 Takeshi Suzuki
  • 👤 Hiroshi Shimizu
  • 👤 Nobutoshi Komori
  • 👤 Takehiro Umeno
  • 👤 Atsuyoshi Shimizu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 19:29
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 176 words
In a process for producing ethylene-propylene block copolymer by the use of a catalyst employed for producing isotactic polypropylene, the process for producing a modified polypropylene which is characterized in that a gas phase polymerization of propylene is substantially carried out in the presence of the catalyst obtained by combining a titanium trichloride composition with an average particle size of 10˜100μ and an organic aluminum to form the propylene polymer segment with a specific surface area more than 0.015 m 2 /g at an yield of more than 3,000 g per 1 g of the titanium trichloride composition in the first step, and then a gas phase polymerization of a mixture of polypropylene and ethylene is successively carried out in the second step to form the copolymer segment with a copolymerization ratio of propylene:ethylene being 5˜80 weight %:95˜20 weight %, wherein the polymerized amount of the second step is 10˜40% of total polymerized amount and wherein normal hexane extraction ratio (75° C., 1 hour) of the ethylene-propylene block copolymer powders obtained is 1˜ 10 weight %.
Claim 2
Dependent Claim 176 words
In a process for producing ethylene-propylene block copolymer by the use of a catalyst employed for producing isotactic polypropylene, the process for producing a modified polypropylene which is characterized in that a gas phase polymerization of propylene is substantially carried out in the presence of the catalyst obtained by combining a titanium trichloride composition with an average particle size of 10˜100μ and an organic aluminum to form the propylene polymer segment with a specific surface area more than 0.015 m 2 /g at an yield of more than 3,000 g per 1 g of the titanium trichloride composition in the first step, and then a gas phase polymerization of a mixture of polypropylene and ethylene is successively carried out in the second step to form the copolymer segment with a copolymerization ratio of propylene:ethylene being 5˜80 weight %:95˜20 weight %, wherein the polymerized amount of the second step is 10˜40% of total polymerized amount and wherein normal hexane extraction ratio (75° C., 1 hour) of the ethylene-propylene block copolymer powders obtained is 1˜ 10 weight %.
Claim 3
Dependent Claim 56 words
The process according to claim 1, wherein the titanium trichloride composition is one obtained by reacting titanium tetrachloride, an organic aluminum compound and an organic ether and treating them with titanium tetrachloride, an ether compound or a reaction product of titanium tetrachloride and an ether compound, and wherein the organic aluminum compound is diethyl aluminum chloride.
Claim 4
Dependent Claim 21 words
The process according to claim 2, wherein less than 0.15 (molar ratio) of triethyl aluminum is used per diethyl aluminum chloride.
Claim 5
Dependent Claim 44 words
The process according to claim 1, wherein the titanium trichloride composition is prepared from the reaction product obtained by reacting magnesium hydroxide with aluminum chloride, as well as ethyl benzoate, silicon tetrachloride and titanium tetrachloride, and wherein the organic aluminum compound is triethyl aluminum.
Claim 6
Dependent Claim 22 words
The process according to claim 4, wherein from 0.01 to 0.25 (molar ratio) of methyl para toluate is used per triethyl aluminum.

References Cited (Backward Citations)

US4284739A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-11-20 1988-05-21 1988-11-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-11-20 1992-05-21 1992-11-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-11-20 1996-05-21 1996-11-20 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag