US5286566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive elastomer
Assignee: Xerox Corp
•
Filing: 1993-08-31
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Granted: 1994-02-15
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Expires: 2013-08-31
Abstract
Abstract An electrically conductive polyurethane elastomer obtained by the reaction of a polytetramethylene ether glycol having the formula HO[(CH 2 ) 4 O] x H where x is from 8 to 41 and from about 20 to about 95 parts by weight per 100 parts by weight of said glycol of at least one diisocyanate, a sufficient amount of chain extender and cross linking agents to provide a crosslinked elastomer and an amount of an asymmetric ionic quarternary ammonium salt having the formula: ##STR1## where R 1 , R 2 , R 3 , R 4 and R 5 are C n H 2n+1 and 1≦n≦25 sufficient to provide a D.C. volume resistivity of from about 10 7 to about 10 11 ohm cm. In a preferred embodiment the asymmetric ionic quarternary ammonium salt is hexadecyl ethyl dimethyl ammonium ethyl sulfate.
Inventors
- 👤 Edward L. Schlueter, Jr.
- 👤 Henry L. Manuel
- 👤 James F. Smith
- 👤 Thomas C. Parker
- 👤 Robert M. Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:12
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/122; C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31605
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
192 words
A member for electrically cooperating with an imaging support surface to attract charged toner particles from the support surface towards the member comprising a conductive substrate for supporting a uniform bias potential thereon and at least one coating on said substrate having an electrical resistivity such that the coating is capable of transmitting a bias potential from the substrate to the outer periphery of the coating, said coating comprising an electrically conductive polyurethane elastomer obtained by the reaction of a polytetramethylene ether glycol having the formula HO[(CH 2 ) 4 O] x H where x is from 8 to 41 and from about 20 to about 95 parts by weight per 100 parts by weight of said glycol of at least one diisocyanate, a sufficient amount of cross linking agents and chain extenders to provide a crosslinked elastomer and an amount of an asymmetric ionic quarternary ammonium salt having the formula: ##STR4## where R 1 , R 2 , R 3 , R 4 and R 5 are C n H 2n+1 and 1≦n≦25 sufficient to provide a D.C. volume resistivity of from about 10 7 to about 10 11 ohm cm.
Claim 2
Dependent Claim
192 words
A member for electrically cooperating with an imaging support surface to attract charged toner particles from the support surface towards the member comprising a conductive substrate for supporting a uniform bias potential thereon and at least one coating on said substrate having an electrical resistivity such that the coating is capable of transmitting a bias potential from the substrate to the outer periphery of the coating, said coating comprising an electrically conductive polyurethane elastomer obtained by the reaction of a polytetramethylene ether glycol having the formula HO[(CH 2 ) 4 O] x H where x is from 8 to 41 and from about 20 to about 95 parts by weight per 100 parts by weight of said glycol of at least one diisocyanate, a sufficient amount of cross linking agents and chain extenders to provide a crosslinked elastomer and an amount of an asymmetric ionic quarternary ammonium salt having the formula: ##STR4## where R 1 , R 2 , R 3 , R 4 and R 5 are C n H 2n+1 and 1≦n≦25 sufficient to provide a D.C. volume resistivity of from about 10 7 to about 10 11 ohm cm.
Claim 3
Dependent Claim
47 words
The member of claim 1 wherein said asymmetric ionic quarternary ammonium salt is selected from the group consisting of: Hexadecyl ethyl dimethyl ammonium ethyl sulfate; 1-Octadecanaminium, N,N,N-trimethyl-, methyl sulfate; 1-Dodecanaminium, N,N,N-trimethyl-, methyl sulfate; 1-Heptadecanaminium, N,N,N, trimethyl-, methyl sulfate; 1-Tetradecanaminium, N,N,N-trimethyl-, methyl sulfate; and 1-Decanaminium, N,N,N-trimethyl-, methyl sulfate.
Claim 4
Dependent Claim
19 words
The member of claim 2 wherein said asymmetric ionic quarternary ammonium salt is hexadecyl ethyl dimethyl ammonium ethyl sulfate.
Claim 5
Dependent Claim
32 words
The member of claim 1 wherein the elastomer of claim 1 wherein said diisocyanate is selected from the group consisting of methylene diisocyanates, diphenylmethane diisocyanates, toluene diisocyanates, naphthalene diisocyanates and blends thereof.
Claim 6
Dependent Claim
94 words
The member of claim 1 wherein said chain extender and cross linking agent comprise a mixture of from about 90 to 60% by weight of a diol having the formula HO(R 6 )OH where R 6 is a straight or branched chain alkyl group having from 2 to 12 carbon atoms and from about 10 to 40% of a triol having the formula: R'--C--[(OH) a (CH 2 OH) b ] where R' is H, CH 3 or C 2 H 5 , a is 0 or 1, b is 2 or 3 and a+b=3.
Claim 7
Dependent Claim
94 words
The member of claim 5 wherein said chain extender and cross linking agent comprise a mixture of from about 90 to 60% by weight of a diol having the formula HO(R 1 )OH where R 1 is a straight or branched chain alkyl group having from 2 to 12 carbon atoms and from about 10 to 40% of a triol having the formula: R'--C--[(OH) a (CH 2 OH) b ] where R' is H, CH 3 or C 2 H 5 , a is 0 or 1, b is 2 or 3 and a+b=3.
Claim 8
Dependent Claim
29 words
The member of claim 1 wherein said quarternary ammonium salt is present in an amount of from about 0.5 parts to 8 parts by weight of the total composition.
Claim 9
Dependent Claim
31 words
The member of claim 1 wherein the elastomer is prepared by adding all the recited reactive constituents and cross linking agents and extenders to a reaction vessel at the same time.
Claim 10
Dependent Claim
38 words
The member of claim 1 wherein the elastomer is prepared by first forming a prepolymer of the polytetramethylene ether glycol and the diisocyanate followed by the addition of the cross linking agent and the extender to the prepolymer.
Claim 11
Dependent Claim
31 words
The member of claim 1 wherein the total weight of chain extenders and cross linking agents is from about 4 to about 18 parts per 100 parts of polytetramethylene ether glycol.
Claim 12
Dependent Claim
35 words
The member of claim 5 wherein the elastomer is formed from a mixture of a chain extender and a cross linking agent comprising about 75% by weight of 1,4 butanediol and 25% by weight trimethylolpropane.
Claim 13
Dependent Claim
34 words
The member of claim 5 wherein the elastomer is formed from a mixture of a chain extender and a cross linking agent comprising about 60% by weight 1,4 butanediol and 40% by weight trimethylolpropane.
Claim 14
Dependent Claim
12 words
The member of claim 1 wherein x is from 39 to 41.
Claim 15
Dependent Claim
29 words
The member of claim 1 wherein said diisocyanate is present in an amount from about 22 to 26 parts by weight per 100 parts by weight of said glycol.
Claim 16
Dependent Claim
27 words
The member of claim 9 wherein said quarternary ammonium salt is initially combined with the chain extenders and cross linking agents and subsequently added to the prepolymer.
Claim 17
Dependent Claim
12 words
The member of claim 1 wherein said member is a transfer roll.
Claim 18
Dependent Claim
12 words
The member of claim 1 wherein said member is a transfer belt.
References Cited (Backward Citations)
US4058879A
Cited
US4116894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |