US4559164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive poly(butylene terephthalate) moldings and compositions therefor
Assignee: General Electric Co
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Filing: 1982-03-09
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Granted: 1985-12-17
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Expires: 2002-03-09
Abstract
Abstract Poly(butylene terephthalate) injected molded articles which contain small uniformly distributed amounts of amorphous carbon or graphite powder, or graphitic carbon in the form of fibers, or any combination thereof, are electroconductive and possess decreased tendency to accumulate charges of static electricity. Minor amounts of glass fibers, polycarbonate resins and rubbery impact modifiers improve the electroconductivity imparted by the carbon.
Inventors
- 👤 Robert J. Kostelnik
- 👤 Allen D. Wambach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:35
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A plastic composition characterized by electroconductivity and comprising up to 90 wt.% poly(1,4-butylene terephthalate) resin, an amount of finely divided carbon intimately distributed throughout said composition sufficient to reduce volumn resistivity to a value of about 1.2×10 7 ohms/sq.cm and below and electroconductivity enhancing amount of an additive selected from the group consisting of from about 1 to about 50% the polycarbonate of bisphenol-A, from about 5 to about 50% glass fibers, from about 2 to about 25% rubbery polymers which improve impact resistance, and blends thereof, each of said additives being percentages by weight of the total composition.
Claim 2
Dependent Claim
99 words
A plastic composition characterized by electroconductivity and comprising up to 90 wt.% poly(1,4-butylene terephthalate) resin, an amount of finely divided carbon intimately distributed throughout said composition sufficient to reduce volumn resistivity to a value of about 1.2×10 7 ohms/sq.cm and below and electroconductivity enhancing amount of an additive selected from the group consisting of from about 1 to about 50% the polycarbonate of bisphenol-A, from about 5 to about 50% glass fibers, from about 2 to about 25% rubbery polymers which improve impact resistance, and blends thereof, each of said additives being percentages by weight of the total composition.
Claim 3
Dependent Claim
21 words
A composition according to claim 1 in which the amount of carbon is about 10% by weight of the total composition.
Claim 4
Dependent Claim
12 words
A composition according to claim 1 wherein said carbon is graphite powder.
Claim 5
Dependent Claim
33 words
A composition according to claim 1 having a content of a polycarbonate of bisphenol A in the range of 1% to 50% based on the weight of the poly(butylene terephthalate) in said composition.
Claim 6
Dependent Claim
33 words
A composition according to claim 4 wherein the weight of said polycarbonate of bisphenol A is in the range of 5% to 25% based on the weight of thermoplastic resin in said composition.
Claim 7
Dependent Claim
42 words
A composition according to claim 1 further containing 1% to 50%, based on the total weight of the additives content of said composition, of said glass fibers, having diameters in the range of 0.001" to 0.0001" and lengths less than 1/4 inch.
Claim 8
Dependent Claim
21 words
The plastic composition according to claim 1, which contains from about 5.9 to about 25% by weight said finely divided carbon.
Claim 9
Dependent Claim
22 words
A composition according to claim 1 wherein said carbon comprises amorphous carbon comprising particles having diameters 0.1 millimicrons to 100 millimicrons wide.
Claim 10
Dependent Claim
24 words
A composition according to claim 8 wherein said amorphous carbon comprises particles having diameters in the range of 0.2 millimicrons to 2 millimicrons wide.
Claim 11
Dependent Claim
28 words
A composition according to claim 1 wherein said carbon comprises graphite fibers having diameters not greater than about 127 microns wide and lengths less than about 6.4 mm.
Claim 12
Dependent Claim
70 words
A composition according to claim 1 wherein said rubbery polymer constitutes 2% to 25% by weight of the overall composition and is selected from the group consisting of a styrene-butadiene-styrene block copolymer, a polyether-ester, poly(1,6-hexanediol-azelate-cophthalate), a multiple stage polymer having a rubbery first stage and an epoxy functional hard final stage, a multiple composite interpolymer comprising a cross-linked acrylic first state and a final rigid thermoplastic phase, and blends thereof.
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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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |