US4786533A
Expired / Lapsed
US
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Transparent polypropylene film for candy twist wrapping
Assignee: Hoechst AG
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Filing: 1986-10-03
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Granted: 1988-11-22
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Expires: 2006-10-03
Abstract
Abstract A transparent propylene polymer film, produced by coextrusion and coated on one or both sides, for candy twist wrapping, wherein the propylene polymer base layer additionally contains a low molecular hydrocarbon resin in an amount of 10 to 40% by weight, based on the total weight of propylene polymer and resin, the base layer has a modulus of elasticity of not less than 3,000 N/mm 2 , measured in both directions of molecular orientation, and each top layer contains a polydialkylsiloxane in an amount of 0.3 to 1.5% by weight, based on the weight of the top layer.
Inventors
- 👤 Guenther Crass
- 👤 Lothar Bothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B27/28; B32B27/283; B32B2307/00; B32B2307/50; B32B2307/514; B32B2323/00; B32B2323/10; B32B2439/00; B32B2439/70; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
97 words
A transparent stretch oriented polymer film, comprising: a base layer of a propylene polymer containing a low molecular weight hydrocarbon resin in an amount from about 10 to 40% by weight, calculated on the total weight of said base layer; and at least one polyolefinic top layer situated on said base layer and containing a polydialkylsiloxane in an amount of about 0.3 to 1.5% by weight calculated on total weight of said cover layer, wherein said base layer has a modulus of elasticity of not less than about 3,000N/mm 2 as measured in both directions of orientation.
Claim 2
Dependent Claim
97 words
A transparent stretch oriented polymer film, comprising: a base layer of a propylene polymer containing a low molecular weight hydrocarbon resin in an amount from about 10 to 40% by weight, calculated on the total weight of said base layer; and at least one polyolefinic top layer situated on said base layer and containing a polydialkylsiloxane in an amount of about 0.3 to 1.5% by weight calculated on total weight of said cover layer, wherein said base layer has a modulus of elasticity of not less than about 3,000N/mm 2 as measured in both directions of orientation.
Claim 3
Dependent Claim
42 words
A polymer film as claimed in claim 1, wherein the propylene polymer of the base layer has a melt flow index within the range from about 0.5 g/10 min to 8 g/10 min, measured according to DIN 53,735 under 2.16 kg load.
Claim 4
Dependent Claim
44 words
A polymer film as claimed in claim 2, wherein the propylene polymer of the base layer has a melt flow index within the range from about 1.5 g/10 min to 4 g/10 min, as measured according to DIN 53,735 under a 2.16 kg load.
Claim 5
Dependent Claim
32 words
A polymer film as claimed in claim 1, wherein said low molecular weight hydrocarbon resin of said base layer has a softening point within the range from about 60° to 180° C.
Claim 6
Dependent Claim
32 words
A polymer film as claimed in claim 4, wherein said low molecular weight hydrocarbon resin of said base layer has a softening point within the range from about 80° to 130° C.
Claim 7
Dependent Claim
41 words
A polymer film as claimed in claim 1, wherein said low molecular hydrocarbon resin of said base layer is selected from the group consisting of a petroleum resin, a styrene resin, a cyclopentadiene resin, or a terpene resin and combinations thereof.
Claim 8
Dependent Claim
41 words
A polymer film as claimed in claim 1, wherein the amount of said low molecular weight hydrocarbon resin of said base layer lies within the range from about 20 to 30% by weight calculated on total weight of said base layer.
Claim 9
Dependent Claim
27 words
A polymer film as claimed in claim 1, wherein the modulus of elasticity of said base layer lies within the range of from about 3,000-4,500N/mm 2 .
Claim 10
Dependent Claim
20 words
A polymer film as claimed in claim 1, comprising a polyolefinic cover layer on each side of said base layer.
Claim 11
Dependent Claim
14 words
A polymer film as claimed in claim 1, wherein said cover layer is sealable.
Claim 12
Dependent Claim
14 words
A polymer film as claimed in claim 10, wherein said cover layer is heat-sealable.
Claim 13
Dependent Claim
53 words
A polymer film as claimed in claim 11, wherein said polyolefin resin of said cover layer is selected from the group consisting of ethylene homopolymer, a copolymer of propylene and ethylene, a copolymer of propylene and 1-butene, a terpolymer of propylene, ethylene, and an alpha olefin having 4-10 carbon atoms and combinations thereof.
Claim 14
Dependent Claim
25 words
A polymer film as claimed in claim 12, wherein said copolymer of propylene and ethylene is comprises predominantly propylene, with up to about 10% ethylene.
Claim 15
Dependent Claim
52 words
A polymer film as claimed in claim 12, wherein said terpolymer of propylene, ethylene, and an alpha-olefin of said cover layer is comprised of about 93.2-99.0% by weight propylene, about 0.5-1.9% by weight ethylene, and about 0.5-4.9% by weight alpha olefin having 4-10 carbon atoms, calculated on total weight of said terpolymer.
Claim 16
Dependent Claim
14 words
A polymer film as claimed in claim 10, wherein said cover layer is cold-sealable.
Claim 17
Dependent Claim
20 words
A polymer film as claimed in claim 15, wherein said cold-sealable cover layer comprises a natural or synthetic rubber polymer.
Claim 18
Dependent Claim
14 words
A polymer film as claimed in claim 1, wherein said cover layer is non-sealable.
Claim 19
Dependent Claim
50 words
A polymer film as claimed in claim 17, wherein said non-sealable cover layer comprises a propylene homopolymer having a melt flow index which is about 0.5 to 1.0 g/10 min under a load of 2.16 kg higher than the melt flow index of the propylene polymer of the base layer.
Claim 20
Dependent Claim
27 words
A polymer film as claimed in claim 1, wherein said polydialkylsiloxane in said cover layer comprises a polydialkylsiloxane having from 1-4 carbon atoms in the alkyl group.
Claim 21
Dependent Claim
29 words
A polymer film as claimed in claim 19, wherein said polydialkylsiloxane has a kinematic viscosity within the range from about 1,000 to 100,000 mm 2 /sec at 25° C.
Claim 22
Dependent Claim
28 words
A polymer film as claimed in claim 20, wherein said polydialkylsiloxane has a kinematic viscosity within the range about 5,000 to 50,000 mm 2 /sec at 25° C.
Claim 23
Dependent Claim
13 words
A polymer film as claimed in claim 19, wherein said polydialkylsiloxane comprises polydimethylsiloxane.
Claim 24
Dependent Claim
23 words
A polymer film as claimed in claim 1, wherein said polymer film has a total thickness of from about 15 to 40 μm.
Claim 25
Dependent Claim
25 words
A polymer film as claimed in claim 1, wherein the thickness of each said top layer or layers is from about 0.2 to 4 μm.
Claim 26
Dependent Claim
33 words
A packaged article, comprising an article wrapped in a polymer film as defined by claim 1, wherein the polymer film is closed by twisting on at least one end of the packaged article.
Claim 27
Dependent Claim
97 words
A twist wrapper for small goods, comprising: a base layer of a propylene polymer containing a low molecular weight hydrocarbon resin in an amount from about 10 to 40% by weight, calculated on the total weight of said base layer; and at least one polyolefinic top layer situated on said base layer and containing a polydialkylsiloxane in an amount of about 0.3 to 1.5% by weight calculated on total weight of said cover layer, wherein said base layer has a modulus of elasticity of not less than about 3,000N/mm 2 as measured in both directions of orientation.
Claim 28
Dependent Claim
97 words
A twist wrapper for small goods, comprising: a base layer of a propylene polymer containing a low molecular weight hydrocarbon resin in an amount from about 10 to 40% by weight, calculated on the total weight of said base layer; and at least one polyolefinic top layer situated on said base layer and containing a polydialkylsiloxane in an amount of about 0.3 to 1.5% by weight calculated on total weight of said cover layer, wherein said base layer has a modulus of elasticity of not less than about 3,000N/mm 2 as measured in both directions of orientation.
Claim 29
Dependent Claim
39 words
A twist wrapper as claimed in claim 26, wherein said low molecular hydrocarbon resin of said base layer is selected from the groups consisting a petroleum resin, a styrene resin, a cyclopentadiene resin, a terpene resin and combinations thereof.
Claim 30
Dependent Claim
41 words
A twist wrapper as claimed in claim 26, wherein the amount of said low molecular weight hydrocarbon resin of said base layer lies within the range from about 20 to 30% by weight calculated on total weight of said base layer.
Claim 31
Dependent Claim
27 words
A twist wrapper as claimed in claim 26, wherein the modulus of elasticity of said base layer lies within the range of from about 3,000-4,500N/mm 2 .
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |