Patent US5034252A successfully refreshed from Google Patents.
US5034252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen barrier properties of pet containers
Assignee: Rexam AB
•
Filing: 1990-03-28
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Granted: 1991-07-23
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Expires: 2010-03-28
Abstract
Abstract A container wall of stretched plastic material has high oxygen barrier properties by incorporating an activating metal into the plastic material. The plastic material is PET in admixture with a polyamide and the metal is either added to the mixture or contained in one or both of the polymers. The material is stretched and aged to produce the container wall with the high oxygen barrier properties. The metal is preferably a transition metal and can be derived from a salt, such as a halide or acetate.
Inventors
- 👤 Torsten Nilsson
- 👤 Rolando Mazzone
- 👤 Erik Frandsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:49
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/29; Y10T428/2913; Y10T428/2916
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
61 words
A container wall comprising stretched and aged material of a mixture of polyethylene terephthalate and polyamide, said mixture containing an activating metal forming active metal complexes having capacity to bond with oxygen for conferring high oxygen barrier properties to the material, the components of the mixture being present in respective amounts so that the wall has said high oxygen barrier properties.
Claim 2
Dependent Claim
61 words
A container wall comprising stretched and aged material of a mixture of polyethylene terephthalate and polyamide, said mixture containing an activating metal forming active metal complexes having capacity to bond with oxygen for conferring high oxygen barrier properties to the material, the components of the mixture being present in respective amounts so that the wall has said high oxygen barrier properties.
Claim 3
Independent Claim
101 words
A method for producing a container with a wall having high oxygen barrier properties, comprising stretching an orientable material to form a wall of the container, said orientable material comprising a mixture of polyethylene terephthalate and a polyamide in which in said mixture an activating metal is present which is capable of forming active metal complexes having capacity to bond with oxygen for conferring high oxygen barrier properties to the material and aging the material at a determined temperature, humidity and time period to confer said high oxygen barrier properties to the wall by the formation of said active metal complexes.
Claim 4
Independent Claim
101 words
A method for producing a container with a wall having high oxygen barrier properties, comprising stretching an orientable material to form a wall of the container, said orientable material comprising a mixture of polyethylene terephthalate and a polyamide in which in said mixture an activating metal is present which is capable of forming active metal complexes having capacity to bond with oxygen for conferring high oxygen barrier properties to the material and aging the material at a determined temperature, humidity and time period to confer said high oxygen barrier properties to the wall by the formation of said active metal complexes.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 1, wherein the metal is added to said mixture of polyethylene terephthalate and polyamide.
Claim 6
Dependent Claim
20 words
A method as claimed in claim 1, wherein said metal is present in one of the polymers in said mixture.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1, wherein said metal is present in both the polymers in said mixture.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 1, wherein the metal is present in an amount between 50 and 10,000 ppm.
Claim 9
Dependent Claim
24 words
A method as claimed in claim 1, wherein said polyamide is present in an amount of 0.5 to 10% by weight of polyethylene terephthalate.
Claim 10
Dependent Claim
24 words
A method as claimed in claim 1, wherein said polyamide is present in an amount of 1 to 7% by weight of polyethylene terephthalate.
Claim 11
Dependent Claim
24 words
A method as claimed in claim 1, wherein said polyamide is present in an amount of 2 to 4% by weight of polyethylene terephthalate.
Claim 12
Dependent Claim
16 words
A method as claimed in claim 1, wherein said metal is added as a metal compound.
Claim 13
Dependent Claim
15 words
A method as claimed in claim 1, wherein said metal is added as a salt.
Claim 14
Dependent Claim
14 words
A method as claimed in claim 1, wherein said metal is a transition metal.
Claim 15
Dependent Claim
30 words
A method as claimed in claim 1, wherein said metal is present as an acetate of an element selected from the group consisting of cobalt, magnesium, manganese, and mixtures thereof.
Claim 16
Dependent Claim
50 words
A method as claimed in claim 1 comprising heating said mixture of polyethylene terephthalate and polyamide for at least 10 hours at a temperature of at least 90° C. in a dry atmosphere and injection molding said mixture to produce a preform, and stretching the preform to produce the container.
Claim 17
Dependent Claim
26 words
A method as claimed in claim 14 wherein said aging is effected on the stretched preform at a temperature of about 55° C. for 3 weeks.
Claim 18
Dependent Claim
20 words
A method as claimed in claim 15 wherein said aging is effected in air at a relative humidity of 50%.
Claim 19
Dependent Claim
26 words
A method as claimed in claim 14 wherein said aging is effected on the stretched preform at a temperature of about 100° C. for 3 days.
Claim 20
Dependent Claim
20 words
A method as claimed in claim 17 wherein said aging is effected in air at a relative humidity of 50%.
Claim 21
Dependent Claim
18 words
A method as claimed in claim 1 wherein said aging of the material is effected after stretching thereof.
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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) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
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