US5292561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent shrink film made from biaxially oriented polypropylene
Assignee: Hoechst AG
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Filing: 1991-09-19
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Granted: 1994-03-08
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Expires: 2011-09-19
Abstract
Abstract A transparent shrink film made from propylene useful for all-round labeling of essentially cylindrical containers, such as bottles, comprises a propylene polymer and has, at 100° C., a shrinkage in the longitudinal direction of at least 10% and a shrinkage in the transverse direction of less than 2%. A process for producing the film is also provided.
Inventors
- 👤 Herbert Peiffer
- 👤 Ursula Murschall
- 👤 Gunter Schloegl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:04
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; B; B29; B29C; B29C61/00; B29C61/003; B29C61/06; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2995/00; B29K2995/0018; B29K2995/0026; B29L; B29L2031/00; B29L2031/744; C08L2203/00; C08L2203/10; C08L23/14; C08L23/142; C08L57/00; C08L57/02; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
36 words
A film comprising a propylene polymer, wherein said film has at 100° C. a shrinkage in the longitudinal direction of at least about 10% and a shrinkage in the transverse direction of less than about 2%.
Claim 2
Dependent Claim
36 words
A film comprising a propylene polymer, wherein said film has at 100° C. a shrinkage in the longitudinal direction of at least about 10% and a shrinkage in the transverse direction of less than about 2%.
Claim 3
Dependent Claim
26 words
A film as claimed in claim 1, wherein said propylene polymer is an isotactic polypropylene having an n-heptane-soluble content of about 15% by weight or less.
Claim 4
Dependent Claim
23 words
A film as claimed in claim 2, wherein said isotactic polypropylene has an n-heptane-soluble content of about 2 to about 6% by weight.
Claim 5
Dependent Claim
24 words
A film as claimed in claim which contains the propylene polymer in an amount of from 60 to 95% by weight of the film.
Claim 6
Dependent Claim
49 words
A film as claimed in claim 4, which additionally comprises about 5 to about 40% by weight of a hydrogenated hydrocarbon resin having a softening point in the range from about 130° to about 180° C., the percentages being based on the total weight of the polypropylene/hydrocarbon resin mixture.
Claim 7
Dependent Claim
38 words
A film as claimed in claim 5, wherein said hydrogenated hydrocarbon resin is a low-molecular-weight synthetic resin which has a softening point in the range of about 130° to about 160° C., determined in accordance with ASTM E28.
Claim 8
Dependent Claim
47 words
A film as claimed in claim additionally comprising outer layers on both sides of said film, independently comprised of a propylene homopolymer or ethylene-propylene copolymer, the outer layers may contain up to 40 % by weight of the individual outer layer of a low molecular weight resin.
Claim 9
Dependent Claim
20 words
A film as claimed in claim 7, wherein one or both of the outer layers additionally comprises an antiblocking agent.
Claim 10
Dependent Claim
48 words
A film as claimed in claim 8, wherein said antiblocking agent comprises silicon dioxide or calcium carbonate, each having a mean particle size of between about 1.5 and about 3 μm and present in an amount of about 0.1 to about 0.5% by weight of the outer layer.
Claim 11
Dependent Claim
21 words
A film as claimed in claim 1, having an overall thickness in the range of about 10 to about 50 μm.
Claim 12
Dependent Claim
72 words
A film as claimed in claim 1, which has a shrink capacity of greater than about 10% at 100° C. and greater than about 25% at 120° C. in the longitudinal direction and a shrink capacity of less than about 2% at 100° C. and less than about 10% at 120° C. in the transverse direction, the percentages being based on the respective length extension of the film before the shrinking process.
Claim 13
Dependent Claim
42 words
A film as claimed in claim 1, which has a modulus of elasticity in the longitudinal direction of greater than about 2800 N/mm 2 , and a modulus of elasticity in the transverse direction of greater than about 2500 N/mm 2 .
Claim 14
Dependent Claim
44 words
A film as claimed in claim 12, wherein said modulus of elasticity in the longitudinal direction is about 3000 to about 3300 N/mm 2 , and wherein said modulus of elasticity in the transverse direction is about 2800 to about 3300 N/mm 2 .
Claim 15
Dependent Claim
37 words
A film as claimed in claim 1, which has a tear strength in the longitudinal direction of greater than about 170 N/mm 2 , and in the transverse direction of greater than about 150 N/mm 2 .
Claim 16
Dependent Claim
41 words
A film as claimed in claim 14, wherein said tear strength in the longitudinal direction is about 180 to about 200 N/mm 2 and wherein said tear strength in the transverse direction is about 160 to about 180 N/mm 2 .
Claim 17
Dependent Claim
22 words
A film as claimed in claim 1, wherein said film is a transparent shrink film for shrink-wrap labeling of substantially cyclindrical containers.
Claim 18
Dependent Claim
36 words
A film as claimed in claim 7, having an overall thickness in the range of about 10 to about 50 μm, wherein the outer layers each have a thickness of about 0.2 to about 0.7 μm.
Claim 19
Dependent Claim
14 words
A film as claimed in claim 1, wherein the film consists essentially of polypropylene.
Claim 20
Dependent Claim
27 words
A film as claimed in claim 7, wherein the outer layers comprise a polypropylene having a higher melt flow index than the polypropylene of the base layer.
Claim 21
Dependent Claim
28 words
A film as claimed in claim 7, wherein the outer layers are heat-sealable and comprise an ethylenepropylene copolymer containing about 2 to about 10% by weight of ethylene.
Claim 22
Dependent Claim
55 words
A film as claimed in claim 1, which has a shrink capacity of about 14 to about 18 at 100° C. and about 25 to 30% at 120° C. in the longitudinal direction and about 0 to about 2% at 100° C. and about 3 to about 7 at 120° C. in the transverse direction.
Claim 23
Dependent Claim
17 words
A film as claimed in claim 5, which consists essentially of polypropylene and said hydrogenated hydrocarbon resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-07 | 1997-09-06 | 1998-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-07 | 2001-09-06 | 2002-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-07 | 2005-09-06 | 2006-03-08 | $7700.00 | Window Closed / Lapsed |