Polyurethane for use in electrostatic dissipating applications
AssigneeThe B. F. Goodrich Company
InventorsEdmond G. Kolycheck, Elaine A. Mertzel, Francis R. Sullivan
Life of this patent
Estimating the term…
Abstract
A thermoplastic polyurethane is provided which has electrostatic dissipative properties. The thermoplastic polyurethane comprises the polymeric reaction product of an ethylene ether oligomer glycol intermediate co-reacted with a non-hindered diisocyanate and an extender glycol to produce the polyurethane polymer. The ethylene ether oligomer glycol intermediate comprises a polyethylene glycol. The oligomer glycol intermediate has an average molecular weight from about 500 to about 5,000.
Claims17
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.