US6889719B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic pipe and manufacturing method therefor
Assignee: Toyoda Gosei Co Ltd
•
Filing: 2002-07-03
•
Granted: 2005-05-10
•
Expires: 2022-07-03
Abstract
Abstract A plastic pipe 10 is a pipe utilized in a cooling water systems, and the bonding strength of each layer is heightened, and resistance capabilities of the antifreeze solution are enhanced. The plastic pipe 10 comprises an inner layer 22 formed from either a polyphenylene sulfide or an aromatic polysulfide, which is a denatured substance thereof, an intermediate layer 24, which is a mixture of PPS resin and a polyamide resin, and an outer layer 26 including a polyamide resin. The inner layer 22 is formed such that permeation of an antifreeze, which has mainly ethylene glycol, is less than 3.0 g/m 2 per day. The resistance capabilities of the antifreeze solution can be achieved by making the thickness of the inner layer 22 0.2 mm or greater.
Inventors
- 👤 Norio Watanabe
- 👤 Kenichi Mitsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:51
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/121; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/337
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
A multi-layer plastic pipe for liquid containing antifreeze solution, the multi-layer plastic pipe comprising: an inner layer made of a first resin material, the first resin material having a PPS resin selected from a group of a polyphenylene sulfide and a denatured aromatic polysulfide resin; an intermediate layer made of a second resin material, the second resin material being a mixture of the PPS resin and a polyamide resin; and an outer layer made of a third resin material including a polyamide resin, wherein: the inner layer is formed such that permeation of the antifreeze solution having mainly ethylene glycol becomes less than 3.0 g/m 2 per day; the first resin material contains 20 to 40 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers; and the second resin material contains 10 to 30 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers.
Claim 2
Dependent Claim
149 words
A multi-layer plastic pipe for liquid containing antifreeze solution, the multi-layer plastic pipe comprising: an inner layer made of a first resin material, the first resin material having a PPS resin selected from a group of a polyphenylene sulfide and a denatured aromatic polysulfide resin; an intermediate layer made of a second resin material, the second resin material being a mixture of the PPS resin and a polyamide resin; and an outer layer made of a third resin material including a polyamide resin, wherein: the inner layer is formed such that permeation of the antifreeze solution having mainly ethylene glycol becomes less than 3.0 g/m 2 per day; the first resin material contains 20 to 40 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers; and the second resin material contains 10 to 30 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers.
Claim 3
Dependent Claim
20 words
The plastic pipe according to claim 1 , wherein a thickness of the inner layer is 0.2 mm or more.
Claim 4
Dependent Claim
32 words
The plastic pipe according to claim 1 , wherein the second resin material has a wt % ratio of the PPS resin to polyamide resin in a range of 90:10 to 55:45.
Claim 5
Dependent Claim
20 words
The plastic pipe according to claim 3 , wherein a thickness of the inner layer is 0.2 mm or more.
Claim 6
Independent Claim
168 words
A method for manufacturing a multi-layer plastic pipe for liquid containing antifreeze solution, the method comprising: preparing (i) a first resin material having a PPS resin selected from a group of a polyphenylene sulfide and a denatured aromatic polysulfide resin, (ii) a second resin material being a mixture of the PPS resin and a polyamide resin; and (iii) a third resin material including a polyamide resin, and extruding a first resin material, a second resin material and a third resin material such that an inner layer, an intermediate layer and an outer layer are laminated annularly to make the multi-layer plastic pipe, wherein: the inner layer is formed such that permeation of an antifreeze solution having mainly ethylene glycol becomes less than 3.0 g/m 2 per day; the first resin material contains 20 to 40 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers; and the second resin material contains 10 to 30 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers.
Claim 7
Independent Claim
168 words
A method for manufacturing a multi-layer plastic pipe for liquid containing antifreeze solution, the method comprising: preparing (i) a first resin material having a PPS resin selected from a group of a polyphenylene sulfide and a denatured aromatic polysulfide resin, (ii) a second resin material being a mixture of the PPS resin and a polyamide resin; and (iii) a third resin material including a polyamide resin, and extruding a first resin material, a second resin material and a third resin material such that an inner layer, an intermediate layer and an outer layer are laminated annularly to make the multi-layer plastic pipe, wherein: the inner layer is formed such that permeation of an antifreeze solution having mainly ethylene glycol becomes less than 3.0 g/m 2 per day; the first resin material contains 20 to 40 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers; and the second resin material contains 10 to 30 wt % of a softening material including ethylene-gylcidyl methacrylate and ethylene-propylene copolymers.
Claim 8
Dependent Claim
19 words
The method according to claim 5 , wherein a thickness of the inner layer is 0.2 mm or more.
Claim 9
Dependent Claim
31 words
The method according to claim 5 , wherein the second resin material has a wt % ratio of the PPS resin to polyamide resin in a range of 90:10 to 55:45.
References Cited (Backward Citations)
US3561493A
Cited
US5004782A
Cited
US5560398A
Cited
US5588468A
Cited
US5792532A
Cited
US6485806B1
Cited
JPH11300844A
Cited
US6118968A
Cited
US6613714B2
Cited
US6608136B1
Cited
US6476158B1
Cited
US6604551B2
Cited
US6446673B1
Cited
US6514611B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-05-09 | 2008-11-08 | 2009-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-05-09 | 2012-11-08 | 2013-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-05-09 | 2016-11-08 | 2017-05-10 | $7700.00 | Window Closed / Lapsed |