US5259990A
Expired / Lapsed
US
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Electrically conductive polyurethane elastomer
Assignee: Xerox Corp
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Filing: 1993-03-25
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Granted: 1993-11-09
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Expires: 2013-03-25
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 the 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: ##STR1## Where R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are C n H 2n+1 and 1≦n≦25 sufficient to provide a resistivity of from about 10 7 to about 10 11 ohm cm. In a preferred embodiment the asymmetric ionic quarternary ammonium salt is (3-lauramidopropyl) trimethylammonium sulfate.
Inventors
- 👤 Edward L. Schlueter, Jr.
- 👤 Henry Manuel
- 👤 James F. Smith
- 👤 Thomas C. Parker
- 👤 Robert M. Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:05
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/122; C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/31504; Y10T428/31551; Y10T428/31605
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
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 , R 5 and R 6 are C n H 2n+1 and 1≦n≦25 sufficient to provide a resistivity of from about 10 7 to about 10 11 ohm cm.
Claim 2
Dependent Claim
124 words
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 , R 5 and R 6 are C n H 2n+1 and 1≦n≦25 sufficient to provide a resistivity of from about 10 7 to about 10 11 ohm cm.
Claim 3
Dependent Claim
26 words
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 4
Dependent Claim
95 words
The elastomer of claim 1 wherein said chain extenders and cross linking agents comprise a mixture of from about 90 to 60% by weight of a diol having the formula HO(R 7 ) OH where R 7 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 5
Dependent Claim
29 words
The elastomer 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 6
Dependent Claim
32 words
The polyurethane of claim 1 wherein the elastomer is prepared by adding all the recited reactive constituents and cross linking agents and chain extenders to a reaction vessel at the same time.
Claim 7
Dependent Claim
37 words
The polyurethane 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 cross linking agents and chain extenders to the prepolymer.
Claim 8
Dependent Claim
31 words
The polyurethane of claim 1 wherein the total weight of cross linking agents and chain extenders is from about 4 to about 18 parts per 100 parts of polytetramethylene ether glycol.
Claim 9
Dependent Claim
35 words
The polyurethane of claim 3 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 10
Dependent Claim
34 words
The polyurethane of claim 3 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 11
Dependent Claim
12 words
The polyurethane of claim 1 wherein x is from 39 to 41.
Claim 12
Dependent Claim
29 words
The polyurethane 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 13
Dependent Claim
27 words
The elastomer of claim 6 wherein said quarternary ammonium salt is initially combined with the cross linking agents and chain extenders and subsequently added to the prepolymer.
Claim 14
Dependent Claim
93 words
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 (3-lauramidopropyl) trimethyl ammonium methyl sulfate to provide a resistivity of from about 10 7 to about 10 11 ohm cm.
Claim 15
Dependent Claim
93 words
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 (3-lauramidopropyl) trimethyl ammonium methyl sulfate to provide a resistivity of from about 10 7 to about 10 11 ohm cm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |