US5691052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric compositions with high self-adhesion and packaging materials and packages made therefrom
Assignee: Pechiney Plastic Packaging Inc
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Filing: 1995-06-07
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Granted: 1997-11-25
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Expires: 2015-06-07
Abstract
Abstract The invention relates to a polymeric composition which acts as an improved cold seal mechanism over prior art cold seal structures. The composition comprises a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a lower viscosity, non-tacky resin. The composition has a seal strength of at least 0.2 lbs per inch when sealed to itself at a temperature of less than 120° F., and can be formed into a film for subsequent use in packaging.
Inventors
- 👤 Gregory K. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:37
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/32; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/5855; C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0846; C09J123/0869; C09J153/00; B32B2270/00; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/10; B32B2553/00; B65D75/04; B65D75/20; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/24; C08L53/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2852; Y10T428/2878
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
52 words
An extrudable polymeric composition comprising a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a non-tacky resin, said composition having a seal strength of at least 0.2 lbs. per inch when sealed to itself at a temperature of less than 120° F.
Claim 2
Dependent Claim
52 words
An extrudable polymeric composition comprising a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a non-tacky resin, said composition having a seal strength of at least 0.2 lbs. per inch when sealed to itself at a temperature of less than 120° F.
Claim 3
Dependent Claim
15 words
A coextruded polymeric film having at least one layer comprising the composition of claim 1.
Claim 4
Dependent Claim
15 words
The polymeric film of claim 2 wherein the tacky adhesive comprises a styrene block copolymer.
Claim 5
Dependent Claim
14 words
The polymeric film of claim 2 wherein the non-tacky resin is ethylene acrylic acid.
Claim 6
Dependent Claim
13 words
The polymeric film of claim 2, wherein at least one layer comprises polypropylene.
Claim 7
Dependent Claim
10 words
The polymeric film of claim 2, said film being oriented.
Claim 8
Dependent Claim
18 words
A coextruded elongated, multilayer strip, said strip having at least one layer comprising the composition of claim 1.
Claim 9
Dependent Claim
11 words
A package including an elongated, multilayer strip as in claim 3.
Claim 10
Dependent Claim
10 words
A package including a polymeric film as in claim 7.
Claim 11
Dependent Claim
17 words
A coextruded multilayer, polymeric film as in claim 5, said film being cut into an elongated strip.
Claim 12
Dependent Claim
17 words
A coextruded multilayer, polymeric film as in claim 10, said film further comprising a layer of HDPE.
Claim 13
Dependent Claim
22 words
A coextruded multilayer, polymeric film as in claim 10, said film further comprising a second layer capable of forming a heat seal.
Claim 14
Dependent Claim
32 words
A coextruded multilayer, polymeric film as in claim 10, said layer capable of forming a heat seal comprising a compound selected from the group consisting of ethylene acrylic acid and an ionomer.
Claim 15
Dependent Claim
13 words
The composition of claim 1 wherein the composition further comprises an antiblocking agent.
Claim 16
Dependent Claim
80 words
A coextruded multilayer, polymeric film having a sealant layer comprising a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a non-tacky resin, said non-tacky resin having a viscosity at least one and a half times less than the viscosity of the tacky adhesive, said viscosity being measured at a shear rate similar to the shear rate encountered during extrusion, said sealant layer being capable of forming a cold seal bond.
Claim 17
Dependent Claim
80 words
A coextruded multilayer, polymeric film having a sealant layer comprising a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a non-tacky resin, said non-tacky resin having a viscosity at least one and a half times less than the viscosity of the tacky adhesive, said viscosity being measured at a shear rate similar to the shear rate encountered during extrusion, said sealant layer being capable of forming a cold seal bond.
Claim 18
Dependent Claim
17 words
A coextruded multilayer, polymeric film as in claim 15, wherein said tacky adhesive comprises a styrene-isoprene copolymer.
Claim 19
Dependent Claim
17 words
A coextruded multilayer, polymeric film as in claim 15, wherein said non-tacky resin comprises ethylene acrylic acid.
Claim 20
Dependent Claim
17 words
A coextruded multilayer, polymeric film as in claim 15, said sealant layer further comprising an antiblocking agent.
Claim 21
Dependent Claim
10 words
A package including multilayer polymer film as in claim 15.
Claim 22
Dependent Claim
28 words
The composition of claim 1 wherein the blend comprises 40% to 80% by weight of the tacky adhesive and 60% to 20% by weight of the non-tacky resin.
Claim 23
Dependent Claim
30 words
The multilayer, polymeric film of claim 15 wherein the blend comprises 40% to 80% by weight of the tacky adhesive and 60% to 20% by weight of the non-tacky resin.
Claim 24
Dependent Claim
32 words
The package of claim 8 wherein a first film having a first elongated, multilayer strip is attached to a second film having a second elongated, multi-layer strip, forming a cold seal mechanism.
Claim 25
Dependent Claim
25 words
The package of claim 22 wherein the package can be opened at the point of the cold seal mechanism by the application of manual force.
Claim 26
Dependent Claim
19 words
The package of claim 23 wherein the package may be reclosed at the point of the cold seal mechanism.
Claim 27
Dependent Claim
68 words
An extrudable polymeric composition comprising a blend of: (a) 40% to 80% by weight of a tacky adhesive styrene-isoprene copolymer; (b) 60% to 20% by weight of a non-tacky resin; wherein said non-tacky resin has a viscosity at least one and a half times less than the viscosity of the tacky adhesive, said viscosity being measured at a shear rate similar to the shear rate encountered during extrusion.
Claim 28
Dependent Claim
68 words
An extrudable polymeric composition comprising a blend of: (a) 40% to 80% by weight of a tacky adhesive styrene-isoprene copolymer; (b) 60% to 20% by weight of a non-tacky resin; wherein said non-tacky resin has a viscosity at least one and a half times less than the viscosity of the tacky adhesive, said viscosity being measured at a shear rate similar to the shear rate encountered during extrusion.
Claim 29
Dependent Claim
17 words
An extrudable polymeric composition as in claim 25, wherein said styrene-isoprene copolymer is extrudable at 380° F.
Claim 30
Dependent Claim
19 words
An extrudable polymeric composition as in claim 23, wherein said styrene-isoprene copolymer has a melt index of about 5.
Claim 31
Dependent Claim
28 words
An extrudable polymeric composition as in claims 26 or 27, wherein said non-tacky adhesive is selected from the group consisting of ethylene acrylic acid and ethylene vinyl acetate.
Claim 32
Dependent Claim
88 words
A coextruded multilayer polymeric film comprising: (a) a first sealant layer, said first layer comprising a blend of 40% to 80% by weight of said blend of a tacky adhesive styrene-isoprene copolymer and 60% to 20% by weight of said blend of a non-tacky resin; (b) a second core layer, said second layer disposed in surface-to-surface contact with said first layer, said second layer comprising white polypropylene; and (c) a third layer, said third layer disposed in surface-to-surface contact with said second layer, said third layer comprising polypropylene.
Claim 33
Dependent Claim
88 words
A coextruded multilayer polymeric film comprising: (a) a first sealant layer, said first layer comprising a blend of 40% to 80% by weight of said blend of a tacky adhesive styrene-isoprene copolymer and 60% to 20% by weight of said blend of a non-tacky resin; (b) a second core layer, said second layer disposed in surface-to-surface contact with said first layer, said second layer comprising white polypropylene; and (c) a third layer, said third layer disposed in surface-to-surface contact with said second layer, said third layer comprising polypropylene.
Claim 34
Dependent Claim
53 words
A coextruded, multilayer polymeric film as in claim 29, wherein said first layer comprises between 5 to 15% of the thickness of the film, said second layer comprises between 65 to 75% of the thickness of the film, and said third layer comprises between 15 to 25% of the thickness of the film.
Claim 35
Dependent Claim
12 words
A package made from the coextruded, multilayer polymeric film of claim 29.
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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) | 2000-11-24 | 2001-05-26 | 2001-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-24 | 2005-05-26 | 2005-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-24 | 2009-05-26 | 2009-11-25 | $7700.00 | Window Closed / Lapsed |