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Browse Prior Art Database

Lowering the Resistivity of Polyurethane

IP.com Disclosure Number: IPCOM000103079D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 7K

Publishing Venue

IBM

Related People

Chen, HH: AUTHOR [+2]

Abstract

Disclosed is a synthesis method for reducing volume resistivity of polyurethanes significantly by adding a small quantity of low molecular weight polyether to polyesters in the urethane synthesis.

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This is the abbreviated version, containing approximately 100% of the total text.

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Lowering the Resistivity of Polyurethane

Disclosed is a synthesis method for reducing volume resistivity of polyurethanes significantly by adding a small quantity of low molecular weight polyether to polyesters in the urethane synthesis.

The method involves reacting a mixture of 0.9 equivalent polyesters and 0.1 equivalent polyether with 1.0 to 1.2 equivalents isocyanate in the presence of a catalyst. The synthesized polyurethane exhibits volume resistivity below
3.3x(exp)9 ohm-cm. The value does not change with time, in contrast to the resistivity of commercial polyurethanes, which increases upon aging because of depletion of antistatic agents. Commercial polyurethanes without antistatic agents have volume resistivity above 5x(exp)11 ohm-cm.

An example formulation consists of 1.05 equivalent(EQ) Desmodur N* (hexamethylene isocyanate), 0.7 EQ Multron R12A* (polyester), 0.1 EQ Desmophen 1700* (polyester), Desmophen 651A* (polyester), 0.1 EQ polyethylene glycol 600 (polyether), and 0.005% dibutyltindilaurate (catalyst). The polyesters, polyether and the catalyst are dissolved in a solvent, such a butyl acetate, and mixed thoroughly. The isocyanate in the same solvent is then added to the polyols and mixed thoroughly. The mixed solution (solid can vary from 5% to 85%) is ready to be used for coating. The coated polyurethane can be cured at room temperature or elevated temperatures.

* Trademarks of Mobay Chemical Corporation

Disclosed anonymously.

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