US4772497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strong steam-sterilizable multiple-layer film, and packages for physiologic solutions, made therefrom
Assignee: Wihuri Oy
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Filing: 1986-09-25
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Granted: 1988-09-20
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Expires: 2006-09-25
Abstract
Abstract The invention relates to a strong and steam-sterilizable multiple-layer plastic film for packaging physiologic solutions, and to a strong and sterilizable package, made of this film, for physiologic solutions. Since the conventional plastics used for packaging physiologic solutions turn brittle under steam-sterilization, a new type of multiple-layer film has been invented which has, especially after steam-sterilization, mechanical properties superior to those of a conventional plastic film. The film according to the invention is produced in such a way that at least one layer is a mixture of polyolefin, preferably polypropylene, and an elastomer. In this manner the resistance to flex crack formation can be improved about 10-fold.
Inventors
- 👤 Hannu O. Maasola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:31
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; A; A61; A61J; A61J1/00; A61J1/05; A61J1/10; B32B27/30; B32B27/306; B32B27/32; B32B27/36; B32B2307/00; B32B2307/50; B32B2307/514; B32B2323/00; B32B2323/04; B32B2323/10; B32B2439/00; B32B2439/80; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
A strong and steam-sterilizable multiple-layer plastic film for packaging physiologic solutions comprising an outer layer formed from a material selected from the group consisting of polyester, polyester copolymer, polyolefin, and polyamide, and an inner layer formed from a mixture of polypropylene and ethylene-vinyl acetate elastomer wherein said multiple-layer plastic film is capable of being steam-sterilized at a temperature of at least 120° C. and maintains its mechanical properties after steam-sterilization.
Claim 2
Dependent Claim
70 words
A strong and steam-sterilizable multiple-layer plastic film for packaging physiologic solutions comprising an outer layer formed from a material selected from the group consisting of polyester, polyester copolymer, polyolefin, and polyamide, and an inner layer formed from a mixture of polypropylene and ethylene-vinyl acetate elastomer wherein said multiple-layer plastic film is capable of being steam-sterilized at a temperature of at least 120° C. and maintains its mechanical properties after steam-sterilization.
Claim 3
Dependent Claim
25 words
The multiple-layer plastic film of claim 1 wherein said mixture of polypropylene and ethylene-vinyl acetate elastomer contains, by weight of the mixture, about 10-60% elastomer.
Claim 4
Dependent Claim
25 words
The multiple-layer plastic film of claim 2 wherein said mixture of polypropylene and ethylene-vinyl acetate elastomer contains, by weight of the mixture, about 20-50% elastomer.
Claim 5
Dependent Claim
17 words
The multiple-layer plastic film of claim 1 wherein said outer layer is formed from a linear polyethylene.
Claim 6
Dependent Claim
20 words
The multiple-layer plastic film of claim 4 wherein said linear polyethylene has a density of about 0.940-0.960 g/cm 3 .
Claim 7
Dependent Claim
17 words
The multiple-layer plastic film of claim 1 wherein said outer layer is formed from an oriented polyester.
Claim 8
Dependent Claim
15 words
The multiple-layer plastic film of claim 1 wherein said outer layer is formed from polypropylene.
Claim 9
Dependent Claim
36 words
The multiple-layer plastic film of claim 1 which additionally comprises an innermost layer situated so that the inner layer is interposed between said innermost and outer layers and said innermost layer is formed from a polyolefin.
Claim 10
Dependent Claim
72 words
A strong and sterilizable plastic package for physiologic solutions comprising a multiple-layer plastic film having an outer layer formed from a material selected from the group consisting of polyester, polyester copolymer, polyolefin, and polyamide, and an inner layer formed from a mixture of polypropylene and ethylene-vinyl acetate elastomer wherein said plastic package is capable of being steam-sterilized at a temperature of at least 120° C. and maintains its mechanical properties after steam-sterilization.
Claim 11
Dependent Claim
72 words
A strong and sterilizable plastic package for physiologic solutions comprising a multiple-layer plastic film having an outer layer formed from a material selected from the group consisting of polyester, polyester copolymer, polyolefin, and polyamide, and an inner layer formed from a mixture of polypropylene and ethylene-vinyl acetate elastomer wherein said plastic package is capable of being steam-sterilized at a temperature of at least 120° C. and maintains its mechanical properties after steam-sterilization.
Claim 12
Dependent Claim
24 words
The plastic package of claim 9 wherein said mixture of polypropylene and ethylene-vinyl acetate elastomer contains, by weight of the mixture, about 10-60% elastomer.
Claim 13
Dependent Claim
24 words
The plastic package of claim 10 wherein said mixture of polypropylene and ethylene-vinyl acetate elastomer contains, by weight of the mixture, about 20-50% elastomer.
Claim 14
Dependent Claim
16 words
The plastic package of claim 9 wherein said outer layer is formed from a linear polyethylene.
Claim 15
Dependent Claim
19 words
The plastic package of claim 12 wherein said linear polyethylene has a density of about 0.940-0.960 g/cm 3 .
Claim 16
Dependent Claim
16 words
The plastic package of claim 9 wherein said outer layer is formed from an oriented polyester.
Claim 17
Dependent Claim
14 words
The plastic package of claim 9 wherein said outer layer is formed from polypropylene.
Claim 18
Dependent Claim
24 words
The plastic package of claim 9 wherein the connection units of said package are formed from a mixture of polypropylene and ethylene-vinyl acetate elastomer.
Claim 19
Dependent Claim
34 words
The plastic package of claim 9 which additionally comprises an innermost layer situated so that the inner layer is interposed between said innermost and outer layers and said innermost layer is formed from polyolefin.
References Cited (Backward Citations)
SU564184A1
Cited
JPS5335778A
Cited
JPS54160487A
Cited
GB2023497A
Cited
JPS5728777A
Cited
US4561110A
Cited
GB8319164D0
Cited
GB2124551A
Cited
US4654240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |