US5726283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive polyester sheet
Assignee: Far Eastern New Century Corp
•
Filing: 1997-01-03
•
Granted: 1998-03-10
•
Expires: 2017-01-03
Abstract
Abstract A conductive polyester sheet having three layers, comprising one substrate layer and two surface layers, laminated together by co-extrusion is provided. All the three layers are made from polyester and/or copolyester, and the surface layers further contain carbon black and thus are useful as conductive layers. The sheet has a surface conductivity of not more than 10 8 ohms and the flow index of the material for the conductive layers during the extrusion step is not lower than 60 g/min (loading, 2160 g; temperature, 275° C.).
Inventors
- 👤 Tsan Hung Tsai
- 👤 Rong Shiun Pan
- 👤 Cheng Chung Wu
- 👤 Yuan Hwey Hsu
- 👤 Jen Hao Wei
- 👤 Shung Mine Hong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:30
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/06; B32B27/08; B32B27/30; B32B27/302; B32B27/36; C; C08; C08L; C08L67/00; C08L67/02; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; B32B2250/00; B32B2250/03; B32B2264/00; B32B2264/10; B32B2264/107; B32B2264/108; B32B2307/00; B32B2307/20; B32B2307/202; B32B2325/00; B32B2355/00; B32B2355/02; B32B2367/00; C08L31/00; C08L31/02; C08L31/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/26; Y10T428/261; Y10T428/28; Y10T428/2848; Y10T428/31
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A conductive polyester sheet having three layers, comprising one substrate layer and two surface layers laminated together by co-extrusion, all the three layers being made from polyester and/or copolyester, the surface layers further containing carbon black and acting as conductive layers, said conductive layers each containing: (a) 25-97 wt % of a polyester or copolyester resin, (b) 0.1-40 wt % of a copolyester as a disperser and/or 0.1-10 wt % of an ethylene-vinyl acetate copolymer as a dispersing assistant agent; and (c) 3-25 wt % of carbon black, said sheet having a surface resistance of not more than 10 ohms and a thickness ranging from 0.1 to 1.0 mm, the conductive layers having a total thickness of 2-80% of total of the sheet and each having a flow index of not lower than 60 g/min (loading, 2160 g; temperature, 275° C.) during the extrusion step.
Claim 2
Dependent Claim
145 words
A conductive polyester sheet having three layers, comprising one substrate layer and two surface layers laminated together by co-extrusion, all the three layers being made from polyester and/or copolyester, the surface layers further containing carbon black and acting as conductive layers, said conductive layers each containing: (a) 25-97 wt % of a polyester or copolyester resin, (b) 0.1-40 wt % of a copolyester as a disperser and/or 0.1-10 wt % of an ethylene-vinyl acetate copolymer as a dispersing assistant agent; and (c) 3-25 wt % of carbon black, said sheet having a surface resistance of not more than 10 ohms and a thickness ranging from 0.1 to 1.0 mm, the conductive layers having a total thickness of 2-80% of total of the sheet and each having a flow index of not lower than 60 g/min (loading, 2160 g; temperature, 275° C.) during the extrusion step.
Claim 3
Dependent Claim
106 words
The conductive polyester sheet of claim 1, wherein the polyester and copolyester each have an intrinsic viscosity of between 0.4-1.2 and a melting point of between 200°-330° C., the polyester is a homopolymer and the copolyester is synthesized by reaction of ethylene glycol, terephthalic acid and at least one other diol and/or dicarboxylic acid: (i) the diol being selected from the group consisting of 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, diglycol, 1,4-dimethylol cyclohexane, 3-methyl-pentanediol, and 2-methyl-hexanediol; and (ii) the dicarboxylic acid being selected from the group consisting of: malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, cyclohexanecarboxylic acid, and isophthalic acid.
Claim 4
Dependent Claim
100 words
The conductive polyester sheet of claim 1, wherein the copolyester in (b) has an intrinsic viscosity of between 0.2-0.7 and a melting point of between 30°-120° C., and said copolyester is synthesized by reaction of ethylene glycol, terephthalic acid and at least one other diol and/or dicarboxylic acid; (i) the diol being selected from the group consisting of 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, diglycol, 1,4-dimethylol cyclohexane, 3-methyl-pentanediol, and 2-methyl-hexanediol; and (ii) the dicarboxylic acid being selected from the group consisting of: malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, cyclohexanecarboxylic acid, and isophtalic acid.
Claim 5
Dependent Claim
20 words
The conductive polyester sheet of claim 1, wherein said ethylene-vinyl acetate copolymer has a melting point of between 80°-100° C.
Claim 6
Dependent Claim
12 words
The conductive polyester sheet of claim 2, wherein said homopolymer is polybutylene-terephthalate.
Claim 7
Dependent Claim
12 words
The conductive polyester sheet of claim 2, wherein said homopolymer is polyethylene-terephthalate.
Claim 8
Dependent Claim
13 words
The conductive polyester sheet of claim 2, wherein said homopolymer is polycyclohexane dimethylene-terephthalate.
References Cited (Backward Citations)
US4308314A
Cited
US4746574A
Cited
US4871613A
Cited
US4876129A
Cited
US5013606A
Cited
US5432145A
Cited
US5346765A
Cited
US5206482A
Cited
US5573833A
Cited
US5208103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-09 | 2001-09-08 | 2002-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-09 | 2005-09-08 | 2006-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-09 | 2009-09-08 | 2010-03-10 | $7700.00 | Window Closed / Lapsed |