US4842187A
Expired / Lapsed
US
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Opaque film for candy twist wrapping
Assignee: Hoechst AG
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Filing: 1987-03-30
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Granted: 1989-06-27
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Expires: 2007-03-30
Abstract
Abstract Described is an opaque, biaxially draw-oriented thermoplastic film for candy twist wrapping. The film is formed from a polymer mixture comprising from about 40 to about 60% by weight of polypropylene and from about 35 to about 55% by weight of polystyrene, relative to the total weight of the mixture. The mixture additionally comprises from about 5 to about 15% by weight of a filler material, relative to the total weight of the mixture.
Inventors
- 👤 Siegfried Janocha
- 👤 Guenther Crass
- 👤 Gunter Schloegl
- 👤 Lothar Bothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:19
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/28; B32B27/30; B32B27/302; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L25/00; C08L25/02; C08L25/04; C08L25/06; B32B2250/00; B32B2250/24; B32B2270/00; B32B2307/00; B32B2307/40; B32B2307/41; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; B32B2325/00; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S206/00; Y10S206/80; Y10S383/00; Y10S383/908; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1397; Y10T428/26; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
90 words
An opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture comprising: (a) from about 40 to about 60% by weight of polypropylene; (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture wherein the twist rate of said film comprises a value of at least 85%, as measured at a total rate of winding in a range of from about 360° to 900°.
Claim 2
Dependent Claim
90 words
An opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture comprising: (a) from about 40 to about 60% by weight of polypropylene; (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture wherein the twist rate of said film comprises a value of at least 85%, as measured at a total rate of winding in a range of from about 360° to 900°.
Claim 3
Dependent Claim
45 words
A film as claimed in claim 1, wherein said filler material comprises an inorganic filler comprising calcium carbonate, silicon dioxide, titanium dioxide or mixtures thereof, each said filler material having a mean particle size in a range of from about 2 to about 5 μm.
Claim 4
Dependent Claim
31 words
A film as claimed in claim 1, wherein the density of said film is a value lower than the additive value of the density of each individual component of said film.
Claim 5
Dependent Claim
38 words
A film as claimed in claim 1, wherein said film comprises a multi-layer structure having a base layer comprising said polymer mixture, and at least one functional covering layer on at least one side of said base layer.
Claim 6
Dependent Claim
26 words
A film as claimed in claim 4, wherein the thickness of said base layer comprises more than 50% of the total thickness of said multi-layer structure.
Claim 7
Dependent Claim
31 words
A film as claimed in claim 4, wherein the thickness of said at least one covering layer comprises a value within a range of from about 0.5 to about 5 μm.
Claim 8
Dependent Claim
24 words
A film as claimed in claim 6, wherein said thickness comprises a value within a range of from about 0.5 to about 2 μm.
Claim 9
Dependent Claim
39 words
A film as claimed in claim 4, wherein said at least one covering layer comprises a lubricant comprising from about 0.4 to about 1.5% by weight of polydialkylsiloxane, relative to the weight of said at least one covering layer.
Claim 10
Dependent Claim
28 words
A film as claimed in claim 1, wherein the total thickness of said film comprises a value within a range of from about 15 to about 30 μm.
Claim 11
Dependent Claim
24 words
A film as claimed in claim 9, wherein said thickness comprises a value within a range of from about 20 to about 25 μm.
Claim 12
Dependent Claim
14 words
A film as claimed in claim 1, wherein said film comprises a single-layer film.
Claim 13
Dependent Claim
27 words
A film as claimed in claim 1, wherein said polypropylene comprises a polymer having a melting point within a range of from about 150° to about 170°C.
Claim 14
Dependent Claim
46 words
A film as claimed in claim 1, wherein said polymer mixture has a melt flow index in a range of from about 0.5 g/10 min. to about 8 g/10 min. measured at a temperature of about 230° C. and 2.16 g load measured at DIN 53,735.
Claim 15
Dependent Claim
21 words
A film as claimed in claim 13, wherein said range is from about 1.5 g/10 min. to about 4 g/10 min.
Claim 16
Dependent Claim
15 words
A film as claimed in claim 1, wherein said filler material comprises an organic filler.
Claim 17
Dependent Claim
18 words
A film as claimed in claim 1, further comprising an antioxidant, antistatic agent, colorant, stabilizer or mixtures thereof.
Claim 18
Dependent Claim
18 words
A film as claimed in claim 6, wherein said at least one covering layer comprises a heat-sealable layer.
Claim 19
Dependent Claim
77 words
A film as claimed in claim 17 wherein said heat-sealing layer comprises an ethylene homopolymer, a copolymer of propylene and ethylene in an amount of not more than about 10% by weight relative to the copolymer, a copolymer of propylene and 1-butene in an amount of from about 10 to about 15% by weight relative to the copolymer, a terpolymer of propylene, ethylene and an alpha-olefin having from 4 to 10 carbon atoms, or a mixture thereof.
Claim 20
Dependent Claim
32 words
A film as claimed in claim 4, wherein at least one of said base layer and said covering layer comprise from about 0.1 to about 1% by weight of an antiblocking agent.
Claim 21
Dependent Claim
68 words
An article of manufacture, comprising an article twist-wrapped with an opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture comprising: (a) from about 40 to about 60% by weight of polypropylene; (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture.
Claim 22
Dependent Claim
68 words
An article of manufacture, comprising an article twist-wrapped with an opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture comprising: (a) from about 40 to about 60% by weight of polypropylene; (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture.
Claim 23
Dependent Claim
92 words
An opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture, consisting essentially of: (a) from about 40 to about 60% by weight of polypropylene; (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture where the twist rate of said film comprises a value of at least 85%, as measured at a total rate of winding in a range of from about 360° to 900°.
Claim 24
Dependent Claim
92 words
An opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture, consisting essentially of: (a) from about 40 to about 60% by weight of polypropylene; (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture where the twist rate of said film comprises a value of at least 85%, as measured at a total rate of winding in a range of from about 360° to 900°.
Claim 25
Dependent Claim
68 words
A twist wrapper for small articles, consisting essentially of an opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture comprising: (a) from about 40 to about 60% by weight of polypropylene: (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture.
Claim 26
Dependent Claim
68 words
A twist wrapper for small articles, consisting essentially of an opaque, biaxially draw-oriented thermoplastic film comprising a polymer mixture comprising: (a) from about 40 to about 60% by weight of polypropylene: (b) from about 35 to about 55% by weight of polystyrene; and (c) from about 5 to about 15% by weight of a filler material, said amounts being relative to the total weight of said polymer mixture.
References Cited (Backward Citations)
US3666836A
Cited
US4303708A
Cited
US4394235A
Cited
JPS58197049A
Cited
JPS6023042A
Cited
JPS6036128A
Cited
US4663219A
Cited
US4666772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |