US5370937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film for packaging having oxygen barrier characteristics
Assignee: Dow Silicones Corp
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Filing: 1993-09-20
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Granted: 1994-12-06
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Expires: 2013-09-20
Abstract
Abstract The present invention relates to the composition, preparation, and use of multi-layer composite films comprising a core layer of low gas permeable material, two intermediate layers sandwiching the core layer, and two outer layers sandwiching the two intermediate layers. The core layer provides the excellent oxygen barrier property, whereas the intermediate and outer layers protect the core layer so the oxygen permeability of the resulting multi-layer composite film becomes independent on relative humidity.
Inventors
- 👤 Chi-Long Lee
- 👤 Ming-Hsiung Yeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:50
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/048; B65; B65D; B65D2577/00; B65D2577/10; B65D2577/20; B65D2577/2025; C08J2429/00; C08J2483/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
265 words
A multi-layer composite film comprising: a core layer of polyvinyl alcohol; an intermediate layer of a plastic substrate disposed on each side of said core layer; and an outer layer of a silicone resin of sufficient thickness to protect the polyvinyl alcohol from moisture, said silicone resin disposed on each respective intermediate layer, wherein said silicone resin is derived from a silane solution having the following reactants: (a) a silane having the formula: ##STR5## where: R is a hydrocarbon radical having from one to four carbon atoms inclusive, R 5 R 6 R 8 are selected from the group consisting of hydrogen, methyl and ethyl radicals, and at least one of R 5 , R 6 , or R 8 is a hydrogen radical, R 7 is a hydrocarbon radical having from two to four carbon atoms inclusive, R 9 is a hydrocarbon radical having from three to six carbon atoms inclusive, (b) an acrylate individually selected from the group consisting of: ##STR6## where: R is as defined above, R 10 is a hydrogen or methyl group, R 11 is an alkyl or alkenyl group, R 12 is an alkyl group, an alkenyl group, or a --[(CH 2 ) n --O] x --(H 2 C) n group, where each n is independently from 2 to 4, and x is from 1 to 6, q is 1 or 0, and Z is oxygen, NH, NR, or NR 12 , where R is a hydrocarbon radical having from one to four carbon atoms inclusive, and R 11 is an alkyl or alkenyl group; and (c) a solvent.
Claim 2
Dependent Claim
265 words
A multi-layer composite film comprising: a core layer of polyvinyl alcohol; an intermediate layer of a plastic substrate disposed on each side of said core layer; and an outer layer of a silicone resin of sufficient thickness to protect the polyvinyl alcohol from moisture, said silicone resin disposed on each respective intermediate layer, wherein said silicone resin is derived from a silane solution having the following reactants: (a) a silane having the formula: ##STR5## where: R is a hydrocarbon radical having from one to four carbon atoms inclusive, R 5 R 6 R 8 are selected from the group consisting of hydrogen, methyl and ethyl radicals, and at least one of R 5 , R 6 , or R 8 is a hydrogen radical, R 7 is a hydrocarbon radical having from two to four carbon atoms inclusive, R 9 is a hydrocarbon radical having from three to six carbon atoms inclusive, (b) an acrylate individually selected from the group consisting of: ##STR6## where: R is as defined above, R 10 is a hydrogen or methyl group, R 11 is an alkyl or alkenyl group, R 12 is an alkyl group, an alkenyl group, or a --[(CH 2 ) n --O] x --(H 2 C) n group, where each n is independently from 2 to 4, and x is from 1 to 6, q is 1 or 0, and Z is oxygen, NH, NR, or NR 12 , where R is a hydrocarbon radical having from one to four carbon atoms inclusive, and R 11 is an alkyl or alkenyl group; and (c) a solvent.
Claim 3
Dependent Claim
14 words
The multi-layer composite film of claim 1, wherein the plastic substrates are each polyolefins.
Claim 4
Dependent Claim
56 words
The multi-layer composite film of claim 1, wherein said silane solution includes an additive selected from the group consisting of: Si(OR) 4 or a partial hydrolyzate thereof; and R 11 --Si(OR) 3 , where R 11 is an alkyl or alkenyl group, and R is a hydrocarbon radical having from one to four carbon atoms inclusive.
Claim 5
Dependent Claim
13 words
The multi-layer composite film of claim 1, wherein said solvent is an alcohol.
Claim 6
Dependent Claim
13 words
The multi-layer composite film of claim 1, wherein said silane solution includes water.
Claim 7
Dependent Claim
24 words
The multi-layer composite film of claim 1, wherein at least one of the intermediate layers is bonded to the core layer with an adhesive.
Claim 8
Dependent Claim
266 words
A multi-layer composite film comprising: a core layer of polyvinyl alcohol; an intermediate layer of a silicone resin of sufficient thickness to protect the polyvinyl alcohol from moisture, said silicone resin disposed on each side of said core layer, wherein said silicone resin is derived from a silane solution having the following reactants: (a) a silane having the formula: ##STR7## where: R is a hydrocarbon radical having from one to four carbon atoms inclusive, R 5 , R 6 R 8 are selected from the group consisting of hydrogen, methyl and ethyl radicals, and at least one of R 5 , R 6 , R 8 is a hydrogen radical, R 7 is a hydrocarbon radical having from two to four carbon atoms inclusive, R 9 is a hydrocarbon radical having from three to six carbon atoms inclusive, (b) an acrylate individually selected from the group consisting of: ##STR8## where: R is as defined above, R I 0 is a hydrogen or methyl group, R 11 is an alkyl or alkenyl group, R 12 is an alkyl group, an alkenyl group, or a --[(CH 2 ) n --O] x --(H 2 C) n group, where each n is independently from 2 to 4, and x is from 1 to 6, q is 1 or 0, and Z is oxygen, NH, NR, or NR 11 , where R is a hydrocarbon radical having from one to four carbon atoms inclusive, and R 11 is an alkyl or alkenyl group; and (c) a solvent, and an outer layer of a plastic substrate disposed on each respective intermediate layer.
Claim 9
Dependent Claim
266 words
A multi-layer composite film comprising: a core layer of polyvinyl alcohol; an intermediate layer of a silicone resin of sufficient thickness to protect the polyvinyl alcohol from moisture, said silicone resin disposed on each side of said core layer, wherein said silicone resin is derived from a silane solution having the following reactants: (a) a silane having the formula: ##STR7## where: R is a hydrocarbon radical having from one to four carbon atoms inclusive, R 5 , R 6 R 8 are selected from the group consisting of hydrogen, methyl and ethyl radicals, and at least one of R 5 , R 6 , R 8 is a hydrogen radical, R 7 is a hydrocarbon radical having from two to four carbon atoms inclusive, R 9 is a hydrocarbon radical having from three to six carbon atoms inclusive, (b) an acrylate individually selected from the group consisting of: ##STR8## where: R is as defined above, R I 0 is a hydrogen or methyl group, R 11 is an alkyl or alkenyl group, R 12 is an alkyl group, an alkenyl group, or a --[(CH 2 ) n --O] x --(H 2 C) n group, where each n is independently from 2 to 4, and x is from 1 to 6, q is 1 or 0, and Z is oxygen, NH, NR, or NR 11 , where R is a hydrocarbon radical having from one to four carbon atoms inclusive, and R 11 is an alkyl or alkenyl group; and (c) a solvent, and an outer layer of a plastic substrate disposed on each respective intermediate layer.
Claim 10
Dependent Claim
14 words
The multi-layer composite film of claim 7, wherein the plastic substrates are each polyolefins.
Claim 11
Dependent Claim
56 words
The multi-layer composite film of claim 7, wherein said silane solution includes an additive selected from the group consisting of: Si(OR) 4 or a partial hydrolyzate thereof; and R 11 --Si(OR) 3 , where R 11 is an alkyl or alkenyl group, and R is a hydrocarbon radical having from one to four carbon atoms inclusive.
Claim 12
Dependent Claim
13 words
The multi-layer composite film of claim 7, wherein said solvent is an alcohol.
Claim 13
Dependent Claim
13 words
The multi-layer composite film of claim 7, wherein said silane solution includes water.
Claim 14
Dependent Claim
24 words
The multi-layer composite film of claim 7, wherein at least one of the intermediate, layers is bonded to the core layer with an adhesive.
Claim 15
Dependent Claim
300 words
A multi-layer composite film comprising: a first outer layer of a plastic substrate; a first intermediate layer of a silicone resin disposed on said first outer layer; a core layer of polyvinyl alcohol disposed on said first intermediate layer; a second intermediate layer of a plastic substrate disposed on said core layer; and a second outer layer of a silicone resin disposed on said second intermediate layer, wherein said silicone resin disposed on said first and second intermediate layers is of sufficient thickness to protect the polyvinyl alcohol from moisture, said silicone resin derived from a silane solution having the following reactants: (a) a silane having the formula: ##STR9## where: R is a hydrocarbon radical having from one to four carbon atoms inclusive, R 5 R 6 R 8 are selected from the group consisting of hydrogen, methyl and ethyl radicals, and at least one of R 5 , R 6 , or R 8 is a hydrogen radical, R 7 is a hydrocarbon radical having from two to four carbon atoms inclusive, R 9 is a hydrocarbon radical having from three to six carbon atoms inclusive, (b) an acrylate individually selected from the group consisting of: ##STR10## where: R is as defined above, R 10 is a hydrogen or methyl group, R 11 is an alkyl or alkenyl group, R 12 is an alkyl group, an alkenyl group, or a --[(CH 2 ) n --O] x --(H 2 C) n group, where each n is independently from 2 to 4, and x is from 1 to 6, q is 1 or 0, and Z is oxygen, NH, NR, or NR 11 , where R is a hydrocarbon radical having from one to four carbon atoms inclusive, and R 11 is an alkyl or alkenyl group; and (c) a solvent.
Claim 16
Dependent Claim
300 words
A multi-layer composite film comprising: a first outer layer of a plastic substrate; a first intermediate layer of a silicone resin disposed on said first outer layer; a core layer of polyvinyl alcohol disposed on said first intermediate layer; a second intermediate layer of a plastic substrate disposed on said core layer; and a second outer layer of a silicone resin disposed on said second intermediate layer, wherein said silicone resin disposed on said first and second intermediate layers is of sufficient thickness to protect the polyvinyl alcohol from moisture, said silicone resin derived from a silane solution having the following reactants: (a) a silane having the formula: ##STR9## where: R is a hydrocarbon radical having from one to four carbon atoms inclusive, R 5 R 6 R 8 are selected from the group consisting of hydrogen, methyl and ethyl radicals, and at least one of R 5 , R 6 , or R 8 is a hydrogen radical, R 7 is a hydrocarbon radical having from two to four carbon atoms inclusive, R 9 is a hydrocarbon radical having from three to six carbon atoms inclusive, (b) an acrylate individually selected from the group consisting of: ##STR10## where: R is as defined above, R 10 is a hydrogen or methyl group, R 11 is an alkyl or alkenyl group, R 12 is an alkyl group, an alkenyl group, or a --[(CH 2 ) n --O] x --(H 2 C) n group, where each n is independently from 2 to 4, and x is from 1 to 6, q is 1 or 0, and Z is oxygen, NH, NR, or NR 11 , where R is a hydrocarbon radical having from one to four carbon atoms inclusive, and R 11 is an alkyl or alkenyl group; and (c) a solvent.
Claim 17
Dependent Claim
14 words
The multi-layer composite film of claim 13, wherein the plastic substrates are each polyolefins.
Claim 18
Dependent Claim
56 words
The multi-layer composite film of claim 13, wherein said silane solution includes an additive selected from the group consisting of: Si(OR) 4 or a partial hydrolyzate thereof; and R 11 --Si(OR) 3 , where R 11 is an alkyl or alkenyl group, and R is a hydrocarbon radical having from one to four carbon atoms inclusive.
Claim 19
Dependent Claim
13 words
The multi-layer composite film of claim 13, wherein said solvent is an alcohol.
Claim 20
Dependent Claim
13 words
The multi-layer composite film of claim 13, wherein said silane solution includes water.
Claim 21
Dependent Claim
24 words
The multi-layer composite film of claim 13, wherein at least one of the intermediate layers is bonded to the core layer with an adhesive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |