US5045401A
Expired / Lapsed
US
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Non-isothermal crystallizable adhesive compositions for multilayer laminated structures
Assignee: Dow Chemical Co
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Filing: 1989-12-21
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Granted: 1991-09-03
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Expires: 2009-12-21
Abstract
Abstract Multicomponent thermoplastic resin blends are disclosed which have a nonisothermal crystallization half life of less than thirty seconds. Especially preferred are three component resin blends comprising a maleic anhydride grafted HDPE, an unmodified LLDPE copolymer having a density between about 0.905 and 0.93 g/cc, and an unmodified LLDPE copolymer having a density between about 0.89 and 0.92 g/cc. These thermoplastic resin blends can be used as the adhesive layer in multilayer structures. They are especially useful in blown film multilayer structures and they show particularly good adhesion to polar substrates, e.g., EVOH substrates.
Inventors
- 👤 Ricky L. Tabor
- 👤 Gerald M. Lancaster
- 👤 Michael W. Potts
- 👤 Thomas I. Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:48
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B1/00; B32B27/00; B32B27/06; B32B27/08; B32B27/32; C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0807; C09J123/0815; C09J151/00; C09J151/06; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; B32B2439/70; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/24; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
68 words
A method of improving the adhesive strength of an adhesive layer to a polar barrier layer in a laminated multilayer film structure comprising the steps of: (a) measuring the crystallization rate of an aliphatic polyolefin resin blend capable of forming a film structure and (b) selecting the aliphatic polyolefin resin blend having a non-isothermal crystallization half-life of less than about 30 seconds for use as the adhesive layer.
Claim 2
Independent Claim
68 words
A method of improving the adhesive strength of an adhesive layer to a polar barrier layer in a laminated multilayer film structure comprising the steps of: (a) measuring the crystallization rate of an aliphatic polyolefin resin blend capable of forming a film structure and (b) selecting the aliphatic polyolefin resin blend having a non-isothermal crystallization half-life of less than about 30 seconds for use as the adhesive layer.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said laminated multilayer structure is a blown film multilayer structure.
Claim 4
Dependent Claim
31 words
The method of claim 1, said multilayer structure comprising (i) at least one barrier layer, (ii) an adhesive layer adjacent to said barrier layer, and (iii) at least one structural layer.
Claim 5
Dependent Claim
14 words
The method of claim 3, said multilayer structure comprising at least one sealant layer.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein said adhesive layer contains between about 0.03% and about 0.24% of ethylenically unsaturated carboxylic acids or their anhydrides.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein said adhesive layer contains between about 0.03% and about 0.24% of maleic anhydride.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein the barrier layer contains a hydrolyzed ethylene vinyl acetate copolymer.
Claim 9
Dependent Claim
37 words
The method of claim 7 wherein said hydrolyzed ethylene vinyl acetate has an ethylene content of between about 2% and about 60% by weight, and a melt index of between about 0.2 and about 50 grams/10 minutes.
Claim 10
Dependent Claim
37 words
The method of claim 7 wherein said hydrolyzed ethylene vinyl acetate has an ethylene content of between about 15% and about 40% by weight and a melt index of between about 0.5 and about 20 grams/10 minutes.
Claim 11
Dependent Claim
35 words
The method of claim 1 wherein said adhesive layer comprises: (i) between about 30-98% of at least one unmodified polymer or copolymer and (ii) between about 2-70% of a graft modified ethylene polymer or copolymer.
Claim 12
Dependent Claim
29 words
The method of claim 10 wherein said unmodified polymer comprises about 20% to about 100% of a copolymer of ethylene and at least one C 3 -C 12 olefin.
Claim 13
Dependent Claim
34 words
The method of claim 10 wherein said unmodified polymer comprises between about 30% and about 98% of a multicomponent blend of copolymers of ethylene copolymerized with at least one C 3 -C 12 olefin.
Claim 14
Dependent Claim
43 words
The method of claim 10 wherein said graft modified ethylene polymer is comprised of a copolymer of ethylene and at least one C 3 -C 12 olefin graft modified with between about 0.02 and about 3.0% ethylenically unsaturated carboxylic acids or their anhydrides.
Claim 15
Dependent Claim
54 words
The method of claim 10 wherein said graft modified ethylene polymer or copolymer is comprised of HDPE having a pregrafting density between about 0.945 and about 0.970 grams/cubic centimeter, a pregrafting melt index (MI) between about 1 and about 45 which is extrusion graft modified with between about 0.02% and about 3.0% maleic anhydride.
Claim 16
Dependent Claim
52 words
The method of claim 10 wherein said unmodified polymer comprises between about 30% and about 98% of a multicomponent blend of between about 5% and about 80% of a polybutene polymer blended with between about 95% and about 20% of copolymers of ethylene with at least one C 3 -C 12 olefin.
Claim 17
Dependent Claim
22 words
The method of claim 10 wherein said unmodified polymer comprises about 30% to about 98% of a copolymer of ethylene and octene.
Claim 18
Dependent Claim
27 words
The method of claim 10 wherein said unmodified polymer comprises between about 30% and about 98% of a multicomponent blend of copolymers of ethylene copolymerized with octene.
Claim 19
Dependent Claim
79 words
The method of claim 17 wherein said multicomponent blend of copolymers of ethylene and at least one C 3 -C 12 olefin of said adhesive layer comprises: (i) an LLDPE copolymer having a melt index (MI) between about 0.1 and about 25 and a density between about 0.90 and about 0.93 grams per cubic centimeter (g/cc) and (ii) an LLDPE copolymer having MI between about 0.1 and about 25 and a density between about 0.89 and about 0.92 g/cc.
Claim 20
Dependent Claim
18 words
The method of claim 18 wherein the LLDPE copolymers (i) and (ii) are copolymers of ethylene and octene.
Claim 21
Dependent Claim
16 words
The method of claim 24 wherein said laminated multilayer structure is a blown film multilayer structure.
Claim 22
Dependent Claim
32 words
The method of claim 24 said laminated multilayer structure comprising (i) at least one barrier layer, (ii) an adhesive layer adjacent to said barrier layer, and (iii) at least one structural layer.
Claim 23
Dependent Claim
14 words
The method of claim 25, said multilayer structure comprising at least one sealant layer.
Claim 24
Dependent Claim
24 words
The method of claim 24 wherein said adhesive layer contains between about 0.03% and about 0.24% of ethylenically unsaturated carboxylic acids or their anhydrides.
Claim 25
Dependent Claim
19 words
The method of claim 24 wherein said adhesive layer contains between about 0.03% and about 0.24% of maleic anhydride.
Claim 26
Dependent Claim
16 words
The method of claim 24 wherein the barrier layer contains a hydrolyzed ethylene vinyl acetate copolymer.
Claim 27
Dependent Claim
37 words
The method of claim 29 wherein said hydrolyzed ethylene vinyl acetate has an ethylene content of between about 2% and about 60% by weight, and a melt index of between about 0.2 and about 50 grams/10 minutes.
Claim 28
Dependent Claim
37 words
The method of claim 29 wherein said hydrolyzed ethylene vinyl acetate has an ethylene content of between about 15% and about 40% by weight and a melt index of between about 0.5 and about 20 grams/10 minutes.
Claim 29
Dependent Claim
35 words
The method of claim 24 wherein said adhesive layer comprises: (i) between about 30-98% of at least one unmodified polymer or copolymer and (ii) between about 2-70% of a graft modified ethylene polymer or copolymer.
Claim 30
Dependent Claim
31 words
The method of claim 32 wherein said unmodified polymer or copolymer comprises about 20% to about 100% of a copolymer of ethylene and at least one C 3 -C 12 olefin.
Claim 31
Dependent Claim
36 words
The method of claim 32 wherein said unmodified polymer or copolymer comprises between about 30% and about 98% of a multicomponent blend of copolymers of ethylene copolymerized with at least one C 3 -C 12 olefin.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
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