US5512342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer plastic pipe
Assignee: Evonik Operations GmbH
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Filing: 1994-01-28
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Granted: 1996-04-30
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Expires: 2014-01-28
Abstract
Abstract A plastic pipe having improved resistance, inter alia, to methanol-containing fuels and improved mechanical properties, comprising at least: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (I) and said outer layer (III) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each 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 15:04
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/34; B32B1/00; B32B1/08; B32B27/30; B32B27/304; C; C08; C08L; C08L77/00; F; F16; F16L; F16L9/00; F16L9/12; B32B2307/00; B32B2307/70; B32B2307/718; B32B2597/00; B32B2605/00; B32B2605/08; C08L33/00; C08L33/24; F16L11/00; F16L11/04; F16L2011/047; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
67 words
A multilayer plastic pipe comprising at least: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 2
Dependent Claim
67 words
A multilayer plastic pipe comprising at least: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 3
Dependent Claim
20 words
The multilayer plastic pipe according to claim 1, wherein said layer (I) comprises a moulding composition based on a polyamide.
Claim 4
Dependent Claim
20 words
The multilayer plastic pipe according to claim 2, wherein said layer (I) comprises a moulding composition based on polyamide 12.
Claim 5
Dependent Claim
21 words
The multilayer plastic pipe according to claim 1, wherein said layer (I) comprises a moulding composition based on a polyamide/polyglutarimide blend.
Claim 6
Dependent Claim
16 words
The multilayer plastic pipe according to claim 1, wherein the components (I) and (IIa) are identical.
Claim 7
Dependent Claim
63 words
The multilayer plastic pipe according to claim 1, wherein said intermediate layer (II) comprises a moulding composition based on a mixture of: (a) of from 40 to 90% by weight of a polyamide, based on the total weight of said layer (II) and (b) of from 10 to 60% by weight, based on the total weight of said layer (II) of a polyglutarimide.
Claim 8
Dependent Claim
63 words
The multilayer plastic pipe according to claim 6, wherein said intermediate layer (II) comprises a moulding composition based on a mixture of: (a) of from 60 to 80% by weight, based on the total weight of said layer (II), of a polyamide, and (b) of from 20 to 40% by weight, based on the total weight of said layer (II), of a polyglutarimide.
Claim 9
Dependent Claim
82 words
The multilayer plastic pipe according to claim 1, wherein said component (IIb) comprises the following basic building blocks: i) <100% by weight of ##STR5## ii) <100% by weight of ##STR6## iii) <20% by weight of ##STR7## iv) from 1.2 to 20% by weight of ##STR8## where Alkyl is methyl, ethyl, propyl, butyl, or hexyl; and R 1 to R 5 , identical or different, are hydrogen or (C n H 2n+1 ) where n is an integer of from 1 to 6.
Claim 10
Dependent Claim
91 words
The multilayer plastic pipe according to claim 8, wherein said component (IIb) comprises the following basic building blocks: i) from 10 to 60% by weight of ##STR9## ii) from 30 to 80% by weight of ##STR10## iii) from 2 to 10% by weight of ##STR11## iv) from 1.5 to 12% by weight of ##STR12## where Alkyl is methyl, ethyl, propyl, butyl, or hexyl; and R 1 to R 5 , identical or different, are hydrogen or (C n H 2n+1 ) where n is an integer of from 1 to 6.
Claim 11
Dependent Claim
42 words
The multilayer plastic pipe according to claim 8, wherein said component (IIb) comprises from 2 to 10% by weight of ##STR13## where R 5 is hydrogen or (C n H 2n+1 ) where n is an integer of from 1 to 6.
Claim 12
Dependent Claim
19 words
The multilayer plastic pipe according to claim 8, wherein Alkyl and R 1 to R 5 are each methyl.
Claim 13
Dependent Claim
31 words
The multilayer plastic pipe according to claim 1, wherein said inner layer (III) comprises a moulding composition based on a polyvinylidene fluoride having a melt flow index of <17 g/10 min.
Claim 14
Dependent Claim
34 words
The multilayer plastic pipe according to claim 12, wherein said inner layer (III) comprises a moulding composition based on a polyvinylidene fluoride having a melt flow index of from 2 to 13 g/10 min.
Claim 15
Dependent Claim
23 words
The multilayer plastic pipe according to claim 1, wherein said inner layer (III) comprises a moulding compound based on a polyvinylidene fluoride copolymer.
Claim 16
Dependent Claim
25 words
The multilayer plastic pipe according to claim 1, wherein said inner layer (III) is electrically conductive and has a surface resistance of <10 9 Ω.
Claim 17
Dependent Claim
43 words
The multilayer plastic pipe according to claim 1, wherein said inner layer (III) comprises: (a) an outer layer based on polyvinylidene fluoride, and (b) an adjacent layer on the inside which is electrically conductive and has a surface resistance of <10 9 Ω.
Claim 18
Independent Claim
76 words
A method for transporting (petro)chemical substances comprising flowing said substances through a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 19
Independent Claim
76 words
A method for transporting (petro)chemical substances comprising flowing said substances through a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 20
Independent Claim
87 words
A method for carrying brake, cooling and hydraulic fluids or fuel in a motor vehicle comprising flowing said fluid or fuel through a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 21
Independent Claim
87 words
A method for carrying brake, cooling and hydraulic fluids or fuel in a motor vehicle comprising flowing said fluid or fuel through a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 22
Dependent Claim
69 words
A hollow body comprising a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 23
Dependent Claim
69 words
A hollow body comprising a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 24
Dependent Claim
71 words
A filling port or tank comprising a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each adhesively bonded to one another.
Claim 25
Dependent Claim
71 words
A filling port or tank comprising a multilayer plastic pipe comprising: (I) an outer layer, (III) an inner layer comprising a moulding composition based on polyvinylidene fluoride, and (II) an intermediate layer disposed between said inner layer (III) and said outer layer (I) comprising a moulding composition based on a mixture of (a) polyamide, and (b) polyglutarimide, wherein the adjacent layers (I) to (III) are each 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) | 1999-04-30 | 1999-10-30 | 2000-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-30 | 2003-10-30 | 2004-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-30 | 2007-10-30 | 2008-04-30 | $7700.00 | Window Closed / Lapsed |