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A Static Dissipative Size Coat for Coated Abrasives using a Conductive Polymer

IP.com Disclosure Number: IPCOM000033130D
Publication Date: 2004-Nov-29
Document File: 2 page(s) / 25K

Publishing Venue

The IP.com Prior Art Database

Abstract

Coated abrasives are subject to generating large amounts of static buildup during the abrading process. Typically, the static charge can build to 50-100 kV. Obviously, the accumulation of electric charge can be potentially dangerous to operators and their work. As such, methods of dissipating the charge are beneficial. Some solutions to this problem have been presented including using carbon-black additives in the abrasive (US 5108463), and doped polymers (US 50161294). This article describes the method of inducing static dissipating properties to an abrasive by adding conductive polymers to a urea-formaldehyde (UF) based size coat. To construct the static dissipative abrasive, a resinous size coat (top layer of adhesive) is prepared by adding the conductive polymer poly(3,4-ethylenedioxythiphene), trademarked as Baytron P by Bayer (Figure 1), to a urea-formaldehyde resin. Other reagents or additives can be added to the formulation, such as catalysts, curatives, latexes, defoamers, and wetting agents. This blend is then coated onto a previously prepared coated abrasive which does not have a size coat (i.e. the abrasive has only one adhesive layer holding the mineral). The abrasive is then baked at 70 oC for 30 minutes to ensure that the resin is dried and cured. The conductivity of samples containing various levels of Baytron was determined using a PRO STAT Surface Resistance & Resistivity Indicator. Figure 1. Structure of poly(3,4-ethylenedioxythiphene) (Baytron P) RESULTS The formulations used in this test are supplied below in Table 1. The conductivity measured on each sample is also given. The latex used in Sample 4 was Rhoplex TR520 from Rohm and Haas. Table 1. Size coat composition and resistance of experimental samples coated with a UF/Baytron P size coat. SAMPLE UF RESIN (%) BAYTRON P(%) LATEX (%) RESISTANCE (W) 1 100 0 0 ~ 2 80 20 0 1011 3 60 40 0 1010 4 55 35 10 108 The experimental formulations tended to be somewhat thin, or low in viscosity, since the Baytron P contains only 4% solids. The latex was added in Sample 4 to counteract this effect. CONCLUSIONS This technique of inducing conductivity to abrasives can be used successfully in coated abrasives. In the examples provided, resistance was found to be between 108-1011W where resistance values of 102-104W are considered conductive and values of 104 to 1011W are considered static dissipative.

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A Static Dissipative Size Coat for Coated Abrasives using a Conductive Polymer

Coated abrasives are subject to generating large amounts of static buildup during the abrading process.  Typically, the static charge can build to 50-100 kV. Obviously, the accumulation of electric charge can be potentially dangerous to operators and their work.  As such, methods of dissipating the charge are beneficial.  Some solutions to this problem have been presented including using carbon-black additives in the abrasive (US 5108463), and doped polymers (US 50161294).  This article describes the method of inducing static dissipating properties to an abrasive by adding conductive polymers to a urea-formaldehyde (UF) based size coat.

 

To construct the static dissipative abrasive, a resinous size coat (top layer of adhesive) is prepared by adding the conductive polymer poly(3,4-ethylenedioxythiphene), trademarked as Baytron P by Bayer (Figure 1), to a urea-formaldehyde resin.  Other reagents or additives can be added to the formulation, such as catalysts, curatives, latexes, defoamers, and wetting agents.  This blend is then coated onto a previously prepared coated abrasive which does not have a size coat (i.e. the abrasive has only one adhesive layer holding the mineral).  The abrasive is then baked at 70 oC for 30 minutes to ensure that the resin is dried and cured.

The conductivity of samples containing various levels of Baytron was determined using a PRO STAT Surface Resistance & Re...