Claims
- 1. A thermoplastic polyurethane adapted for use as an electrostatic static dissipative agent, comprising:
- a thermoplastic polyurethane having an average molecular weight from about 60,000 to 500,000, a hydroxyl terminated ethylene ether oligomer intermediate having an average molecular weight from about 500 to 5,000 reacted with a non-hindered diisocyanate and an aliphatic extender glycol to produce said thermoplastic polyurethane, said oligomer intermediate being a polyethylene glycol;
- wherein said polyethylene glycol consists of repeating ethylene ether units n wherein n is from about 11 to about 115,
- wherein said non-hindered diisocyanate is an aromatic or cyclic aliphatic diisocyanate,
- wherein said extender glycol consists of nonether glycol having from 2 to 6 carbon atoms and containing only primary alcohol groups.
- 2. A thermoplastic polyurethane according to claim 1, wherein said polyurethane has a surface resistivity of less than about 1.times.10.sup.14 Ohms/sq, as measured according to ASTM D-257 and a volume resistivity of less than about 1.times.10.sup.14 Ohms-cm as measured according to ASTM D-257.
- 3. A thermoplastic polyurethane according to claim wherein said hydroxyl terminated polyester oligomer (a) contains on the average from 4 to 8 repeating ester units and has an average molecular weight from about 700 to 2500.
- 4. A thermoplastic polyurethane according to claim 3, wherein the diisocyanate is 4,4'-methylenebis(phenyl isocyanate).
- 5. A thermoplastic polyurethane according to claim 4, wherein said diisocyanate is simultaneously reacted with said extended glycol and said ethylene ether oligomer intermediate.
- 6. A thermoplastic polyurethane according to claim 5, wherein the extender glycol is 1,4-butane diol, and wherein the amount of said extender glycol to said oligomer glycol intermediate is from about 0.11 to about 3.0 moles.
- 7. A thermoplastic polyurethane according to claim 3, wherein the amount of said diisocyanate is from about 0.97 to 1.02 moles for every total one mole of said oligomer intermediate and said extender glycol, and wherein the average molecular weight of said thermoplastic polyurethane is from about 80,000 to about 180,000.
- 8. A thermoplastic polyurethane according to claim 6, wherein the amount of said diisocyanate is from about 0.97 to 1.02 moles for every total one mole of said oligomer intermediate and said extender glycol, and wherein the molecular weight of said thermoplastic polyurethane is from about 80,000 to about 180,000.
- 9. A thermoplastic polyurethane according to claim 8, wherein the polyurethane has a percent light transmission greater than 50 percent for 20 mil film as measured according to ASTM D-1003-61; and a percent haze value less than 60 percent for a 20 mil film as measured using a Hunterlab model D-54P-5 spectrophotometer.
- 10. A thermoplastic polyurethane adapted for use in electrostatic dissipating applications, said polyurethane comprising;
- a) the reaction product of a hydroxyl-terminated ethylene ether oligomer having an average molecular weight of from about 500 to about 5,000, reacted with a nonhindered diisocyanate and an aliphatic extender glycol to produce said thermoplastic polyurethane, said oligomer intermediate being a polyethylene glycol consisting of repeating ethylene ether units n wherein n is from about 4 to about 250; wherein said nonhindered diisocyanate is an aromatic or cycloaromatic diisocyanate; and
- b) wherein said extender glycol consists of an aliphatic non-ether glycol having from 2 to 6 carbon atoms and containing only primary alcohol groups; said thermoplastic polyurethane being essentially free from tertiary amine groups or ammonium groups.
- 11. A thermoplastic polyurethane as set forth in claim 10, wherein said composition has a surface resistivity of less than about 1.times.10.sup.12 Ohms/sq and a volume resistivity of less than about 1.times.10.sup.12 Ohms/cm.
- 12. A thermoplastic polyurethane as set forth in claim 10, wherein said composition has a surface resistivity of less than about 1.times.10.sup.12 Ohms/sq and a volume resistivity of less than about 1.times.10.sup.12 Ohms/cm.
- 13. A thermoplastic polyurethane as set forth in claim 10, wherein said composition has a percent light transmission greater than 50 percent for 20 mil film as measured according to ASTM D-1003-6I; and a percent haze value less than 60 percent for a 20 mil film as measured using a Hunterlab model D-54P-5 spectrophotometer or equivalent.
- 14. A thermoplastic polyurethane as set forth in claim 13, wherein said composition has a percent light transmission greater than 70 percent for 20 mil film as measured according to ASTM D-1003-61; and a percent haze value less than 30 percent for a 20 mil film as measured using a Hunterlab model D-54P-5 spectrophotometer or equivalent.
- 15. A thermoplastic polyurethane as set forth in claim 10, wherein said composition has a percent light transmission greater than 80 percent for 20 mil film as measured according to ASTM D-1003-61; and a percent haze value less than 20 percent for a 20 mil film as measured using a Hunterlab model D-54P-5 spectrophotometer or equivalent.
- 16. A thermoplastic polyurethane composition for use as an electrostatic dissipating agent comprising:
- the reaction product of a hydroxyl-terminated ethylene ether oligomer having an average molecular weight of from about 200 to about 10,000, reacted with a nonhindered diisocyanate and an aliphatic extender glycol to produce said thermoplastic polyurethane, said oligomer intermediate being a polyethylene glycol consisting of repeating ethylene ether units n wherein n is from about 4 to about 250; wherein said nonhindered diisocyanate is an aromatic or cycloaromatic diisocyanate; wherein said extender glycol consists of an aliphatic non-ether glycol having from 2 to 6 carbon atoms and containing only primary alcohol groups; and wherein said thermoplastic polyurethane is essentially free from tertiary amine or ammonia groups.
- 17. A shaped article having electrostatic dissipating properties comprising:
- the reaction product of a hydroxyl-terminated ethylene ether oligomer having an average molecular weight of from about 500 to about 5,000, reacted with a nonhindered diisocyanate and an aliphatic extender glycol to produce said thermoplastic polyurethane, said oligomer intermediate being a polyethylene glycol consisting of repeating ethylene ether units n wherein n is from about 4 to about 250; wherein said nonhindered diisocyanate is an aromatic or cycloaromatic diisocyanate; wherein said extender glycol consists of an aliphatic non-ether glycol having from 2 to 6 carbon atoms and containing only primary alcohol groups; and wherein said thermoplastic polyurethane is essentially free from tertiary amine or ammonia groups.
CROSS-REFERENCE
This is a continuation-in-part of copending application, Ser. No. 07/399,645, filed Aug. 28, 1989, now U.S. Pat. No. 5,047,495, entitled "Polyurethane For Flexible Fuel Containers."
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5047495 |
Kolycheck |
Oct 1991 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
399645 |
Aug 1989 |
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