US4912142A
Expired / Lapsed
US
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Antistatic phase-segregated polyurethanes
Assignee: Dow Chemical Co
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Filing: 1988-11-16
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Granted: 1990-03-27
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Expires: 2008-11-16
Abstract
Abstract This invention is an antistatic thermoplastic, phase-segregated polyurethane containing, as an antistatic additive an effective amount of a monovalent metal tetraphenylboron salt, in the substantial absence of a fatty acid salt, a C 6 -C 30 carboxylic acid ester or phosphate ester compound. Suprisingly, it has been found that, with this particular type of polyurethane, tetraphenylboron salts are very effective antistatic additives even in the absence of enhancer compounds as were previously employed. Accordingly, the antistatic polyurethane is useful for applications such as electronics components and packaging, and other applications where static dissipative ability is needed or desirable.
Inventors
- 👤 Robbert M. Vermeulen
- 👤 Donald M. Maschmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/55; Y; Y10; Y10S; Y10S524/00; Y10S524/91; Y10S524/912
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
21 words
An antistatic thermoplastic, phase-segregated polyurethane containing an antistatic additive consisting essentially of an effective amount of a monovalent metal tetraphenylboron salt.
Claim 2
Dependent Claim
21 words
An antistatic thermoplastic, phase-segregated polyurethane containing an antistatic additive consisting essentially of an effective amount of a monovalent metal tetraphenylboron salt.
Claim 3
Dependent Claim
15 words
The antistatic polyurethane of claim 1 wherein the monovalent metal tetraphenylboron salt is sodium tetraphenylboron.
Claim 4
Dependent Claim
30 words
The antistatic polyurethane of claim 2 wherein the antistatic additive is present in an amount from about 0.2 to about 3 weight percent, based on the weight of the polyurethane.
Claim 5
Dependent Claim
25 words
The antistatic polyurethane of claim 3 wherein the polyurethane is the reaction product of a primary hydroxyl-terminated polyether, a difunctional chain extender, and a diisocyanate.
Claim 6
Dependent Claim
31 words
The antistatic polyurethane of claim 4 wherein the polyether has an equivalent weight from about 800 to about 2000 and the chain extender comprises an α,ω-alkylene diol or a glycol ether.
Claim 7
Dependent Claim
13 words
The antistatic polyurethane of claim 5 wherein the diisocyanate is an aliphatic diisocyanate.
Claim 8
Dependent Claim
13 words
The antistatic polyurethane of claim 5 wherein the diisocyanate is an aromatic diisocyanate.
Claim 9
Dependent Claim
40 words
An antistatic thermoplastic, phase-segregated polyurethane, containing an antistatic additive consisting essentially of a monovalent metal tetraphenylboron salt, wherein said polyurethane is sufficiently antistatic to dissipate 90% of a static charge of 5000 volts of direct current within about 0.8 seconds.
Claim 10
Dependent Claim
40 words
An antistatic thermoplastic, phase-segregated polyurethane, containing an antistatic additive consisting essentially of a monovalent metal tetraphenylboron salt, wherein said polyurethane is sufficiently antistatic to dissipate 90% of a static charge of 5000 volts of direct current within about 0.8 seconds.
Claim 11
Dependent Claim
17 words
The antistatic polyurethane of claim 8 wherein the monovalent metal tetraphenylboron salt consists essentially of sodium tetraphenylboron.
Claim 12
Dependent Claim
30 words
The antistatic polyurethane of claim 9 wherein the antistatic additive is present in an amount from about 0.2 to about 3 weight percent, based on the weight of the polyurethane.
Claim 13
Dependent Claim
25 words
The antistatic polyurethane of claim 10 wherein the polyurethane is the reaction product of a primary hydroxyl-terminated polyether, a difunctional chain extender, and a diisocyanate.
Claim 14
Dependent Claim
31 words
The antistatic polyurethane of claim 11 wherein the polyether has an equivalent weight from about 800 to about 2000 and the chain extender comprises an α,ω-alkylene diol or a glycol ether.
Claim 15
Dependent Claim
13 words
The antistatic polyurethane of claim 12 wherein the diisocyanate is an aliphatic diisocyanate.
Claim 16
Dependent Claim
13 words
The antistatic polyurethane of claim 12 wherein the diisocyanate is an aromatic diisocyanate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |