Static dissipative laminate for work surfaces
AssigneeNevamar Corporation
InventorsIsrael S. Ungar, Robin D. O'Dell, Alice Simon, Joseph A. Lex
Life of this patent
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Abstract
A static dissipative laminate having a resistivity on the order of 10.sup.6 to 10.sup.9 ohms/square and a surface resistance in the static dissipative range even at very low humidities is produced by adding to the melamine resin for the decor sheet a small amount of ionic salt and a small amount of an aliphatic tertiary amine or glycerin which is believed to function as a humectant. The core sheets are formed of carbon filled paper impregnated with a phenolic resin containing a small amount of ionic salt.
Claims20
A decorative, static dissipative, high pressure laminate comprising a plurality of consolidated layers including a plurality of carbon containing core layers impregnated with thermoset core resin containing up to 6% by weight based on the weight of the resin solids of an ionic salt;
- and
- a decor layer above said core layers, said decor layer having an abrasion resistant covering thereon and impregnated with thermoset resin containing 1-7% by weight of an ionic salt and an humectant in an amount sufficient to provide a surface resistance no greater than about 2.times.10.sup.9 at a relative humidity of 17%.
A decorative, static dissipative, high pressure laminate comprising a plurality of consolidated layers having a zero volt charge after two second at 17% or lower relative humidity, said consolidated layers including
- a plurality of core layers having a conductivity of 5.times.10.sup.4 to 5.times.10.sup.6 ohms;
- and
- a decor layer above said core layers, said decor layer being impregnated with a thermoset resin containing an amount sufficient of an ionic salt humectant and to provide a surface resistance no greater than about 2.times.10.sup.9 at a relative humidity of 17%.
A static dissipative, high pressure laminate comprising a plurality of consolidated layers having a zero volt charge after two seconds at 17% or lower relative humidity, said consolidated layers including
- a plurality of core layers having a conductivity of 5.times.10.sup.4 to 5.times.10.sup.6 ohms;
- and
- a decor layer above said core layers, said decor layer being impregnated with a thermoset resin and an amount sufficient of an ionic salt, glycerin or an aliphatic tertiary amine to provide a surface resistance no greater than about 2.times.10.sup.9 at a relative humidity of 17%.
Dependencies are inferred from the claim text.