Patent US6063482A successfully refreshed from Google Patents.
US6063482A
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US
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Biaxially oriented polypropylene film having improved tear propagation resistance
Assignee: Basell Polyolefine GmbH
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Filing: 1997-10-30
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Granted: 2000-05-16
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Expires: 2017-10-30
Abstract
Abstract A biaxially oriented polypropylene film is described. The base ply of the film essentially consists of a polypropylene prepared by means of a metallocene catalyst. This polypropylene is distinguished by a mean isotactic block length of greater than 40, an n-heptane soluble fraction of less than 1% and a ratio of the weight average molecular weight Mw to the number average molecular weight Mn of less than 4.
Inventors
- 👤 Herbert Peiffer
- 👤 Detlef Busch
- 👤 Gunter Schlogl
- 👤 Thomas Dries
- 👤 Andreas Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:56
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/10; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2439/00; B32B2553/00; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08L2314/00; C08L2314/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S526/00; Y10S526/943; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
125 words
A biaxially oriented polypropylene single ply film wherein the mean isotactic block length of the polypropylene molecule between two structural chain defects is, as a statistical average, greater than 40, the n-heptane-insoluble fraction of the polypropylene has a chain isotactic index of at least 95%, measured by means of 13 C-NMR spectroscopy, the ratio of the weight average M w to the number average M n of the molecular weight distribution is less than 4, the n-heptane-soluble fraction of the polypropylene is less than 1%, and the tear propagation resistance of the film in the longitudinal direction is greater than 15 N/(mm of film thickness) and the tear progagation resistance of the film in the transverse direction is greater than 15 N/(mm of film thickness).
Claim 2
Dependent Claim
125 words
A biaxially oriented polypropylene single ply film wherein the mean isotactic block length of the polypropylene molecule between two structural chain defects is, as a statistical average, greater than 40, the n-heptane-insoluble fraction of the polypropylene has a chain isotactic index of at least 95%, measured by means of 13 C-NMR spectroscopy, the ratio of the weight average M w to the number average M n of the molecular weight distribution is less than 4, the n-heptane-soluble fraction of the polypropylene is less than 1%, and the tear propagation resistance of the film in the longitudinal direction is greater than 15 N/(mm of film thickness) and the tear progagation resistance of the film in the transverse direction is greater than 15 N/(mm of film thickness).
Claim 3
Dependent Claim
35 words
The single ply film as claimed in claim 1, wherein the single ply contains a polypropylene whose n-heptane-insoluble fraction has a chain isotactic index, measured by means of 13 C-NMR spectroscopy, of at least 96%.
Claim 4
Dependent Claim
25 words
The single ply film as claimed in claim 1, wherein the single ply contains a polypropylene whose M w /M n is less than 3.0.
Claim 5
Dependent Claim
17 words
The single ply film as claimed in claim 1, wherein the single ply contains an antistatic agent.
Claim 6
Dependent Claim
17 words
The single ply film as claimed in claim 1, wherein the single ply contains a neutralizing agent.
Claim 7
Dependent Claim
16 words
The single ply film as claimed in claim 1, wherein the single ply contains a stabilizer.
Claim 8
Dependent Claim
16 words
The single ply film as claimed in claim 1, wherein the single ply contains a lubricant.
Claim 9
Dependent Claim
17 words
The single ply film as claimed in claim 1, wherein the single ply contains an antiblocking agent.
Claim 10
Dependent Claim
16 words
The single ply film as claimed in claim 1, in the form of a packaging film.
Claim 11
Dependent Claim
16 words
The single ply film as claimed in claim 1, in the form of a laminating film.
Claim 12
Dependent Claim
148 words
A biaxially oriented polypropylene film, which has at least one base ply which contains polypropylene, wherein the mean isotactic block length of the polypropylene molecule between two structural chain defects is, as a statistical average, greater than 40, the n-heptane-insoluble fraction of the polypropylene has a chain isotactic index of at least 95%, measured by means of 13 C-NMR spectroscopy, the ratio of the weight average M w to the number average M n of the molecular weight distribution is less than 4, the n-heptane-soluble fraction of the polypropylene is less than 1%, and the tear propagation resistance of the film in the longitudinal direction is greater than 15 N/(mm of film thickness) and the tear progagation resistance of the film in the transverse direction is greater than 15 N/(mm of film thickness), and at least one ply on each side of the base ply comprising α-olefinic polymers.
Claim 13
Dependent Claim
148 words
A biaxially oriented polypropylene film, which has at least one base ply which contains polypropylene, wherein the mean isotactic block length of the polypropylene molecule between two structural chain defects is, as a statistical average, greater than 40, the n-heptane-insoluble fraction of the polypropylene has a chain isotactic index of at least 95%, measured by means of 13 C-NMR spectroscopy, the ratio of the weight average M w to the number average M n of the molecular weight distribution is less than 4, the n-heptane-soluble fraction of the polypropylene is less than 1%, and the tear propagation resistance of the film in the longitudinal direction is greater than 15 N/(mm of film thickness) and the tear progagation resistance of the film in the transverse direction is greater than 15 N/(mm of film thickness), and at least one ply on each side of the base ply comprising α-olefinic polymers.
Claim 14
Dependent Claim
34 words
The polypropylene film as claimed in claim 11, wherein the base ply contains a polypropylene whose n-heptane-insoluble fraction has a chain isotactic index, measured by means of 13 C-NMR spectroscopy, of at least 96%.
Claim 15
Dependent Claim
24 words
The polypropylene film as claimed in claim 11, wherein the base ply contains a polypropylene whose M w /M n is less than 3.0.
Claim 16
Dependent Claim
18 words
The polypropylene film as claimed in claim 11, wherein the base ply contains a neutralizing agent and/or stabilizer.
Claim 17
Dependent Claim
16 words
The polypropylene film as claimed in claim 11, wherein the base ply contains an antistatic agent.
Claim 18
Dependent Claim
32 words
The polypropylene film as claimed in claim 11, wherein the thickness of the film is 4 to 100 μm, the base ply accounting for about 40 to 60% of the total thickness.
Claim 19
Dependent Claim
15 words
A polypropylene film as claimed in claim 11, in the form of a packaging film.
Claim 20
Dependent Claim
15 words
A polypropylene film as claimed in claim 11, in the form of a laminating film.
Claim 21
Dependent Claim
49 words
A process for the production of a polypropylene film as claimed in claim 11, wherein the orientation in the longitudinal direction is effected with a longitudinal stretching ratio of 3:1 to 9:1 and that in the transverse direction is effected with a transverse stretching ratio of 4:1 to 12:1.
References Cited (Backward Citations)
US4668753A
Cited
EP0115940A1
Cited
US4622237A
Cited
US5236622A
Cited
DE3801535A1
Cited
US5236680A
Cited
US5416178A
Cited
EP0384263A1
Cited
EP0563796A1
Cited
US5474820A
Cited
CA2099214A1
Cited
US5529843A
Cited
EP0593888A1
Cited
DE4242486A1
Cited
WO1994028219A1
Cited
WO1995030708A1
Cited
US5468440A
Cited
US5468440B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-05-16 | 2003-11-15 | 2004-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-16 | 2007-11-15 | 2008-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-16 | 2011-11-15 | 2012-05-16 | $7700.00 | Window Closed / Lapsed |