US5500263A
Expired / Lapsed
US
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Multilayer plastic pipe
Assignee: Evonik Operations GmbH
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Filing: 1994-01-28
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Granted: 1996-03-19
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Expires: 2014-01-28
Abstract
Abstract The present invention relates to a plastic pipe having improved resistance, inter alia, to methanol-containing fuels and improved mechanical properties, comprising. (I) at least one outer layer, (II) at least one inner layer comprising a polyvinylidene fluoride molding composition, and (III) a layer, disposed between the inner layer II and the outer layer I, comprising a molding composition comprising a mixture of: (a) polyamide and (b) polyalkyl acrylate, wherein the layers (I)-(III) are adhesively bonded to one another.
Inventors
- 👤 Stefan Rober
- 👤 Hans Jadamus
- 👤 Michael Boer
- 👤 Roland Feinauer
- 👤 Hans-Dieter Herrmann
- 👤 Hans Ries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/06; B32B27/08; B32B1/00; B32B1/08; B32B27/30; B32B27/304; B32B27/308; B32B27/34; F; F16; F16L; F16L9/00; F16L9/12; F16L9/121; B32B2307/00; B32B2307/70; B32B2307/718; B32B2597/00; Y; Y10; Y10S; Y10S138/00; Y10S138/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/139; Y10T428/1393; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A multilayer plastic pipe comprising, (I) at least one outer layer, (II) at least one inner layer comprising a polyvinylidene fluoride molding composition, and (III) a layer, disposed between said outer layer (I) and said inner layer (II), comprising a molding composition comprising mixture of: (a) polyamide, and (b) polyalkyl acrylate, wherein said layers (I)-(III) are adhesively bonded to one another.
Claim 2
Dependent Claim
61 words
A multilayer plastic pipe comprising, (I) at least one outer layer, (II) at least one inner layer comprising a polyvinylidene fluoride molding composition, and (III) a layer, disposed between said outer layer (I) and said inner layer (II), comprising a molding composition comprising mixture of: (a) polyamide, and (b) polyalkyl acrylate, wherein said layers (I)-(III) are adhesively bonded to one another.
Claim 3
Dependent Claim
19 words
The multilayer plastic pipe according to claim 1, wherein said outer layer (I) comprises a molding composition containing polyamide.
Claim 4
Dependent Claim
18 words
The multilayer plastic pipe according to claim 1, wherein said inner layer (II) comprises a vinylidene fluoride copolymer.
Claim 5
Dependent Claim
57 words
The multilayer plastic pipe according to claim 1, wherein said layer (III) is a molding composition based on a mixture of from 50 to 90% by weight, based on the total weight of layer (III), of polyamide (a) and from 10 to 50% by weight of polyalkyl acrylate (b), based on the total weight of layer (III).
Claim 6
Dependent Claim
57 words
The multilayer plastic pipe according to claim 1, wherein said layer (III) is a molding composition based on the mixture of from 60 to 80% by weight, based on the total weight of layer (III), of polyamide (a) and from 20 to 40% by weight of polyalkyl acrylate (b), based on the total weight of layer (III).
Claim 7
Dependent Claim
89 words
The multilayer plastic pipe according to claim 1, wherein said polyalkyl acrylate (b) comprises: i) from 40 to 80% by weight, based on the total weight of (b), ##STR4## ii) from 10 to 50% by weight, based on the total weight of (b), ##STR5## iii) from 1 to 15% by weight, based on the total weight of (b), ##STR6## where alkyl is methyl, ethyl, propyl, butyl or hexyl, and R 1 to R 4 , which are each identical or different, are hydrogen or C 1 -C 6 -alkyl.
Claim 8
Dependent Claim
39 words
The multilayer plastic pipe according to claim 1, wherein said polyalkyl acrylate (b) is a copolymer of methacrylate, styrene and maleic anhydride, wherein the total amount of styrene and maleic anhydride used is not more than 50% by weight.
Claim 9
Dependent Claim
96 words
The multilayer plastic pipe according to claim 1, wherein said polyalkyl acrylate (b) comprises: (i) less than 100% by weight, based on the total weight of (b), of the unit: ##STR7## (ii) less than 100% by weight, based on the total weight of (b), of the unit: ##STR8## and (iii) less than 30% by weight, based on the total weight of (b), of the unit: ##STR9## where alkyl is methyl, ethyl, propyl, butyl or hexyl, and R 1 to R 4 , which are each identical or different, are hydrogen or C 1 -C 6 -alkyl.
Claim 10
Dependent Claim
20 words
The multilayer plastic pipe according to claim 8, wherein said alkyl and R 1 to R 4 are each methyl.
Claim 11
Dependent Claim
22 words
The multilayer plastic pipe according to claim 1, wherein said outer layer (I) and said inner layer (II) are of identical composition.
Claim 12
Dependent Claim
67 words
A hollow article comprising a multilayer plastic pipe comprising, (I) at least one outer layer, and (II) at least one inner layer comprising a polyvinylidene fluoride molding composition, and (III) a layer, disposed between said outer layer (I) and said inner layer (II), comprising a molding composition comprising a mixture of: (a) polyamide, and (b) polyalkyl acrylate, wherein said layers (I)-(III) are adhesively bonded to one another.
Claim 13
Dependent Claim
67 words
A hollow article comprising a multilayer plastic pipe comprising, (I) at least one outer layer, and (II) at least one inner layer comprising a polyvinylidene fluoride molding composition, and (III) a layer, disposed between said outer layer (I) and said inner layer (II), comprising a molding composition comprising a mixture of: (a) polyamide, and (b) polyalkyl acrylate, wherein said layers (I)-(III) are adhesively bonded to one another.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |