US4595625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealable multilayer film for packaging purposes
Assignee: Hoechst AG
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Filing: 1984-08-30
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Granted: 1986-06-17
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Expires: 2004-08-30
Abstract
Abstract Disclosed is a sealable transparent multilayer film, comprising: a base layer comprised of a propylene polymer and at least one sealable layer comprised of a combination of: (a) from about 67.5 to 89.6% by weight, relative to the weight of the sealable layer, of an olefin resin composition comprised of a co- or terpolymer of ethylene, propylene, butylene or another alpha-olefin having 5 to 10 carbon atoms or of a mixture of said polymers, (b) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a low molecular weight resin which is compatible with the olefin resin composition, (c) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a propylene homopolymer, (d) from about 0.3 to 1.5% by weight, relative to the weight of the sealable layer, of a polydiorganosiloxane, and (e) from about 0.1 to 1.0% by weight, relative to the weight of the sealable layer, of a silicate having the shape of platelets. Also disclosed is a process for the high-speed wrapping of articles utilizing the film according to the invention.
Inventors
- 👤 Gunther Crass
- 👤 Lothar Bothe
- 👤 Siegfried Janocha
- 👤 Wolfgang Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:13
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B2323/00; B32B2323/10; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/25; Y10T428/259; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
166 words
A sealable transparent multilayer film, comprising: a base layer comprised of a propylene polymer and at least one sealable layer comprised of a combination of: (a) from about 67.5 to 89.6% by weight, relative to the weight of the sealable layer, of an olefin resin composition comprised of a co- or terpolymer of ethylene, propylene, butylene or another alpha-olefin having 5 to 10 carbon atoms or of a mixture of said polymers, (b) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a low molecular weight resin which is compatible with the olefin resin composition, (c) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a propylene homopolymer, (d) from about 0.3 to 1.5% by weight, relative to the weight of the sealable layer, of a polydiorganosiloxane, and (e) from about 0.1 to 1.0% by weight, relative to the weight of the sealable layer, of a silicate having the shape of platelets.
Claim 2
Dependent Claim
166 words
A sealable transparent multilayer film, comprising: a base layer comprised of a propylene polymer and at least one sealable layer comprised of a combination of: (a) from about 67.5 to 89.6% by weight, relative to the weight of the sealable layer, of an olefin resin composition comprised of a co- or terpolymer of ethylene, propylene, butylene or another alpha-olefin having 5 to 10 carbon atoms or of a mixture of said polymers, (b) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a low molecular weight resin which is compatible with the olefin resin composition, (c) from about 5 to 15% by weight, relative to the weight of the sealable layer, of a propylene homopolymer, (d) from about 0.3 to 1.5% by weight, relative to the weight of the sealable layer, of a polydiorganosiloxane, and (e) from about 0.1 to 1.0% by weight, relative to the weight of the sealable layer, of a silicate having the shape of platelets.
Claim 3
Dependent Claim
41 words
A multilayer film as claimed in claim 1, wherein component (b) of the sealable layer comprises a low molecular-weight resin selected from the group including hydrocarbon resins, ketone resins, polyamide resins, colophony resins, dammar resins, and chlorinated aliphatic and aromatic resins.
Claim 4
Dependent Claim
33 words
A multilayer films as claimed in claim 1, wherein component (d) of the sealable layer comprises a polydiorganosiloxane having a kinematic viscosity of at least about 100 mm 2 /s at 25° C.
Claim 5
Dependent Claim
22 words
A multilayer film as claimed in claim 1, wherein component (e) has a mean particle diameter from about 0.1 to 3.0 μm.
Claim 6
Dependent Claim
22 words
A multilayer film as claimed in claim 4, wherein component (e) has a mean particle diameter from about 0.2 to 1.5 μm.
Claim 7
Dependent Claim
49 words
A multilayer film as claimed in claim 1, wherein component (d) of the sealable layer comprises a polymethyl-phenyl siloxane having a kinematic viscosity of at least about 100 mm 2 /s at 25° C., and wherein the film has been subjected to a corona treatment to improve its printability.
Claim 8
Dependent Claim
27 words
A multilayer film as claimed in claim 1, wherein the multilayer film has been biaxially oriented and has a thickness of from about 10 to 50 μm.
Claim 9
Dependent Claim
21 words
A multilayer film as claimed in claim 7, wherein the film has a thickness of from about 15 to 35 μm.
Claim 10
Dependent Claim
21 words
A multilayer film as claimed in claim 1, wherein the thickness of the sealing layer is less than about 3 μm.
Claim 11
Dependent Claim
21 words
A multilayer film as claimed in claim 9, wherein the thickness of the sealing layer is less than about 1 μm.
Claim 12
Dependent Claim
51 words
A high-speed process for wrapping articles with a packaging film, comprising the steps of: feeding to a high-speed packaging machine a multilayer packaging film as defined by claim 1; introducing an article to be wrapped into the machine; and packaging said article with said film at a high-speed in the machine.
Claim 13
Dependent Claim
22 words
A packaged article, comprising an article wrapped with a multilayer packaging film, wherein said film comprises the film defined by claim 1.
References Cited (Backward Citations)
FR1377114A
Cited
GB1145199A
Cited
GB1582186A
Cited
US4230767A
Cited
US4294882A
Cited
US4293608A
Cited
US4348457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |