Patent US3673050A successfully refreshed from Google Patents.
US3673050A
Expired / Lapsed
US
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A laminate of a barrier layer enclosed in rigid high density polyolefin layers
Assignee: Dow Chemical Co
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Filing: 1970-02-05
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Granted: 1972-06-27
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Expires: 1990-02-05
Abstract
Abstract This invention provides economical multi-layer sheets that combine high barrier layers with thick layers of rigid high density polyolefins.
Inventors
- 👤 Ritchey O Newman Jr
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D81/00; B65D81/24; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; B32B2250/00; B32B2250/05; B32B2307/00; B32B2307/50; B32B2307/546; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/7246; B32B2307/726; B32B2307/7265; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/043; B32B2327/00; B32B2327/06; B32B2331/00; B32B2331/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/24967; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
19 words
The rigid multi-layer sheet of claim 6 wherein each of said outer layers is at least 10 mils thick.
Claim 2
Dependent Claim
16 words
The rigid multi-layer sheet of claim 1 wherein the outer layers comprise a high density polyethylene.
Claim 3
Dependent Claim
53 words
The rigid multi-layer sheet of claim 1 wherein said copolymer of ethylene and vinyl acetate is blended with an adhesive material selected from a group consisting of a block copolymer of styrene and butadiene, a copolymer of ethylene and ethylacrylate, a copolymer of ethylene and isobutyl acrylate and a polymer of chlorinated polyethylene.
Claim 4
Dependent Claim
159 words
Rigid multi-layer sheet comprising an inner gas and moisture barrier layer, juxtaposed glue layers on each side of said barrier layer and outer layers of a rigid high density polyolefin, said outer layers being formed from said rigid high density polyolefin having an ASTM D-790 flexural modulus of at least 150,000 psi and a combined thickness of at least 20 mils, said gas and moisture barrier layer comprising a copolymer of vinylidene chloride and a remainder of one or more olefinically unsaturated monomers copolymerized therewith and having a thickness of from 0.5 mils to 35 mils, said glue layers comprising a copolymer of ethylene and ethylacrylate and having a thickness of from 0.2 mils to 5 mils, said sheet having a total thickness of more than 20 mils, said rigid multi-layer sheet adapted for thermoforming into a rigid container or containers for packaging food products, said container or containers capable of withstanding hot filled temperatures without substantial collapse failure.
Claim 5
Dependent Claim
19 words
The rigid multi-layer sheet of claim 5 wherein each of said outer layers is at least 10 mils thick.
Claim 6
Dependent Claim
16 words
The rigid multi-layer sheet of claim 5 wherein the outer layers comprise a high density polyethylene.
Claim 7
Dependent Claim
46 words
The rigid multi-layer sheet of claim 5 wherein said copolymer of ethylene and ethylacrylate is blended with an adhesive material selected from a group consisting of a block copolymer of styrene and butadiene, a copolymer of ethylene and isobutyl acrylate and a polymer of chlorinated polyethylene.
Claim 8
Dependent Claim
160 words
Rigid multi-layer sheet comprising an inner gas and moisture barrier layer, juxtaposed glue layers on each side of said barrier layer and outer layers of a rigid high density polyolefin, said outer layers being formed from said rigid high density polyolefin having an ASTM D-790 flexural modulus of at least 150,000 psi and a combined thickness of at least 20 mils, said gas and moisture barrier layer comprising a copolymer of vinylidene chloride and a remainder of one or more olefinically unsaturated monomers copolymerized therewith and having a thickness of from 0.5 mils to 35 mils, said glue layers comprising a copolymer of ethylene and isobutyl acrylate and having a thickness of from 0.2 mils to 5 mils, said sheet having a total thickness of more than 20 mils, said rigid multi-layer sheet adapted for thermoforming into a rigid container or containers for packaging food products, said container or containers capable of withstanding hot filled temperatures without substantial collapse failure.
Claim 9
Dependent Claim
19 words
The rigid multi-layer sheet of claim 9 wherein each of said outer layers is at least 10 mils thick.
Claim 10
Dependent Claim
16 words
The rigid multi-layer sheet of claim 9 wherein the outer layers comprise a high density polyethylene.
Claim 11
Dependent Claim
40 words
The rigid multi-layer sheet of claim 9 wherein said copolymer of ethylene and isobutyl acrylate is blended with an adhesive material selected from a group consisting of a block copOlymer of styrene and butadiene and a polymer of chlorinated polyethylene.
Claim 12
Dependent Claim
158 words
Rigid multi-layer sheet comprising an inner gas and moisture barrier layer, juxtaposed glue layers on each side of said barrier layer and outer layers of a rigid high density polyolefin, said outer layers being formed from said rigid high density polyolefins having an ASTM D-790 flexural modulus of at least 150,000 psi and a combined thickness of at least 20 mils, said gas and moisture barrier layer comprising a copolymer of vinylidene chloride and a remainder of one or more olefinically unsaturated monomers copolymerized therewith and having a thickness of from 0.5 mils to 35 mils, said glue layers comprising a polymer of chlorinated polyethylene and having a thickness of from 0.2 mils to 5 mils, said sheet having a total thickness of more than 20 mils, said rigid multi-layer sheet adapted for thermoforming into a rigid container or containers for packaging food products, said container or containers capable of withstanding hot filled temperatures without substantial collapse failure.
Claim 13
Dependent Claim
19 words
The rigid multi-layer sheet of claim 13 wherein each of said outer layers is at least 10 mils thick.
Claim 14
Dependent Claim
16 words
The rigid multi-layer sheet of claim 13 wherein the outer layers comprise a high density polyethylene.
Claim 15
Dependent Claim
23 words
The rigid multi-layer sheet of claim 13 wherein said polymer of chlorinated polyethylene is blended with a block copolymer of styrene and butadiene.
References Cited (Backward Citations)
US3524795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |