Chain extended low molecular weight polyoxiranes and electrostatic dissipating blend compositions based thereon
AssigneeThe B. F. Goodrich Company
InventorsEdmond G. Kolycheck, Elaine A. Mertzel, Francis R. Sullivan, Gary F. Wilson, Timothy E. Fahey
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Abstract
The present invention relates to electrostatic dissipative polymeric compositions comprising a polyether polyurethane which can be blended with one or more base polymers. In some applications, the polyurethane is useful without further blending. Further, the polyurethane blends can be blended with glass beads or glass fibers which have a synergist effect when combined with the electrostatic dissipative agent.
Claims14
An electrostatic dissipating polymeric composition having a volume resistivity of less than 1.times.10.sup.13 Ohm-cm comprising a blend of from about 3 to about 80 parts of an ESD agent blended with 100 parts of a matrix polymer, said ESD agent comprising the reaction product of:
- a) a homopolymer or copolymer of polyethylene glycol comprising either a homopolymer of ethylene glycol having a weight average molecular weight from about 1000 to about 2000 and comprising repeating ethylene ether units wherein the number of repeat units is from about 20 to about 45 or a copolymer of ethylene glycol and another glycol, said copolymer having a weight average molecular weight from about 1000 to about 5000 and comprising repeating ethylene ether units wherein the number of repeat units is from about 20 to about 115;
- b) a non-hindered diisocyanate which is an aromatic or cyclic aliphatic diisocyanate;
- c) an extender glycol having from 2 to 10 carbon atoms and containing only primary alcohol groups wherein said diisocyanate is reacted at from 0.95 to 1.06 moles per mole of polyethylene glycol and extender glycol;
- and
- said base polymer being one or more polymers selected from the group consisting of polyurethanes, polyamides, polycarbonates, polyolefins, polyphenylene oxide, polyacetal and styrene polymers, and blends and copolymers thereof;
- with the provisos that said ESD agent and said base polymer are not identical.
A thermoplastic polyurethane composition having a volume resistivity of less than 1.times.10.sup.13 Ohm-cm comprising a blend of a base polymer and a polyurethane electrostatic dissipating agent, comprising:
- a) the reaction product of a hydroxy-terminated ethylene ether oligomer reacted with a nonhindered diisocyanate and an aliphatic extender glycol to produce said thermoplastic polyurethane, said oligomer intermediate being a homopolymer or copolymer of polyethylene glycol consisting of either a homopolymer of ethylene glycol having a weight average molecular weight from about 1000 to about 2000 and comprising repeating ethylene ether units wherein the number of repeat units is from about 20 to about 45 or a copolymer of ethylene glycol and another glycol, said copolymer having a weight average molecular weight from about 1000 to about 5000 and comprising repeating ethylene ether units wherein the number of repeat units is from about 20 to about 115;
- wherein said nonhindered diisocyanate is an aromatic or cycloaromatic diisocyanate and wherein said diisocyanate is reacted at from 0.95 to 1.06 moles per mole of ethylene ether oligomer and extender glycol;
- 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
- b) said base polymer comprises a polyurethane, with the proviso that said ESD agent and said polyurethane are different polyurethanes.
A shaped article comprising a thermoplastic polyurethane composition having a volume resistivity of less than 1.times.10.sup.13 Ohm-cm comprising a blend of a base polymer and a polyurethane electrostatic dissipating agent, said polyurethane electrostatic dissipating agent comprising:
- a) the reaction product of a hydroxy-terminated ethylene ether oligomer reacted with a nonhindered diisocyanate and an aliphatic extender glycol to produce said thermoplastic polyurethane, said oligomer intermediate being a homopolymer or copolymer of polyethylene glycol consisting of either a homopolymer of ethylene glycol having a weight average molecular weight from about 1000 to about 2000 and comprising repeating ethylene ether units wherein the number of repeat units is from about 20 to about 45 or a copolymer of ethylene glycol and another glycol, said copolymer having a weight average molecular weight from about 1000 to about 5000 and comprising repeating ethylene ether units wherein the number of repeat units is from about 20 to about 115;
- wherein said nonhindered diisocyanate is an aromatic or cycloaromatic diisocyanate wherein said diisocyanate is reacted at from 0.95 to 1.06 moles per mole of ethylene ether oligomer and extender glycol;
- 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
- b) said base polymer comprising one or more of a polymer or copolymer of styrene, polycarbonate polymers, or copolymers, polyamide polymers or copolymers, polyester polymers or copolymers, polyurethane polymers or copolymers.
Dependencies are inferred from the claim text.