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US6476173B1 Expired / Lapsed US ⏱️ 0.0 years remaining

Propylene homopolymers and methods of making the same

Assignee: ExxonMobil Chemical Patents Inc
•
Filing: 2000-11-07
•
Granted: 2002-11-05
•
Expires: 2020-11-07
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Abstract

Abstract This invention relates to isotactic propylene homopolymer compositions obtained from metallocene catalysis wherein the polymer has a molecular weight distribution (Mw/Mn) in the range of from about 2.5 to about 20.0. The isototic propylene homopolymer composition may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages.

Inventors

  • 👤 Chon-yie Lin
  • 👤 Michael Chia-Chao Chen
  • 👤 Aspy Keki Mehta
  • 👤 Rajan K. Chudgar

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 23:11
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C08F10/00; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/122; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65927; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08L2205/00; C08L2205/02; C08L2205/025; C08L2314/00; C08L2314/06; Y; Y10; Y10S; Y10S526/00; Y10S526/943

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 86 words
A propylene polymer composition comprising: isotactic propylene homopolymer with a molecular weight distribution in the range from 10 to about 20.0 and hexane extractables of less than 1.0 weight percent, wherein a 50.8 mm×50.8 mm×0.508 mm film formed from the propylene polymer composition exhibits an even stretch between the temperature ranges of from 151.7° C. to 157.2° C. when stretched to a final stretched thickness of about 19 μm after preheating the film for 27 sec and stretching the film at a rate of 76.2 mm/sec.
Claim 2
Dependent Claim 86 words
A propylene polymer composition comprising: isotactic propylene homopolymer with a molecular weight distribution in the range from 10 to about 20.0 and hexane extractables of less than 1.0 weight percent, wherein a 50.8 mm×50.8 mm×0.508 mm film formed from the propylene polymer composition exhibits an even stretch between the temperature ranges of from 151.7° C. to 157.2° C. when stretched to a final stretched thickness of about 19 μm after preheating the film for 27 sec and stretching the film at a rate of 76.2 mm/sec.
Claim 3
Dependent Claim 15 words
The propylene polymer composition of claim 1 having a melting point greater than 145° C.
Claim 4
Dependent Claim 21 words
The propylene polymer composition of claim 1 having a melt flow rate in the range of 0.2 dg/min to 30.0 dg/min.
Claim 5
Dependent Claim 19 words
The propylene polymer composition of claim 1 , having a weight average molecular weight range from 140,000 to 750,000.
Claim 6
Dependent Claim 67 words
A propylene polymer composition comprising an isotactic propylene homopolymer having a hexane extractables of less than 2.0 weight percent, and a molecular weight distribution in the range from 10 to 20.0, wherein a film formed from the propylene polymer composition can be stretched in the temperature range of from greater than 148.9° C. without breaking when stretched to a final thickness of from 2 to 100 μm.
Claim 7
Dependent Claim 67 words
A propylene polymer composition comprising an isotactic propylene homopolymer having a hexane extractables of less than 2.0 weight percent, and a molecular weight distribution in the range from 10 to 20.0, wherein a film formed from the propylene polymer composition can be stretched in the temperature range of from greater than 148.9° C. without breaking when stretched to a final thickness of from 2 to 100 μm.
Claim 8
Dependent Claim 16 words
The propylene polymer composition of claim 5 , having a melting point greater than 145° C.
Claim 9
Dependent Claim 22 words
The propylene polymer composition of claim 5 , having a melt flow rate in the range of 0.2 dg/min to 30.0 dg/min.
Claim 10
Dependent Claim 21 words
The propylene polymer composition of claim 5 , wherein the final thickness of the film is from 3 to 75 μm.
Claim 11
Dependent Claim 25 words
The propylene polymer composition of claim 5 , wherein the film formed from the polymer comprises one layer of a multi-layer laminate or coextruded film.
Claim 12
Dependent Claim 19 words
The propylene polymer composition of claim 5 , wherein the propylene polymer is made in a multiple stage process.
Claim 13
Dependent Claim 14 words
The propylene polymer composition of claim 5 , wherein the polymer is highly isotactic.
Claim 14
Dependent Claim 27 words
The propylene polymer composition of claim 5 , wherein the film can be stretched in the temperature range of from 148.9° C. to 166° C. without breaking.
Claim 15
Dependent Claim 19 words
The propylene polymer composition of claim 5 , having a weight average molecular weight range from 140,000 to 750,000.

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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) 2005-11-04 2006-05-06 2006-11-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2009-11-04 2010-05-06 2010-11-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2013-11-04 2014-05-06 2014-11-05 $7700.00 Window Closed / Lapsed

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