Resistance compositions and products thereof

• US 2,498,238 A
• Filed: 04/30/1947
• Issued: 02/21/1950
• Est. Priority Date: 04/30/1947
• Status: Expired due to Term

• Current Assignee: Leo J. Berberich, Wesley W. Pendleton
• Original Assignee: Leo J. Berberich, Wesley W. Pendleton
• Inventors: Berberich, Leo J., Pendleton, Wesley W.
• Application Number:
  US02/745,022
• Time in Patent Office: 1,028 Days
• US Class Current: 174/120.0SC
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H01B 3/42 polyesters; polyethers; polyacetals
• CPC Class Codes: Y10S 174/24 in an inductive device, e.g. reactor, electromagnet
• CPC Class Codes: Y10S 174/29 having a semiconductive layer

Claims

1. A RESISTANCE COMPOSITION COMPOSED OF 100 PARTS BY WEIGHT OF AN OIL MODIFIED ALKYD RESIN DERIVED BY REACTING FROM 45% TO 60% BY WEIGHT OF A DRYING OIL COMPOUND SELECTED FROM THE GROUP CONSISTING OF LINSEED OIL AND LINSEED OIL ACIDS, FROM 40% TO 30%, RESPECTIVELY OF PHTHALIC ANHYDRIDE, AND THE BALANCE GLYCEROL, FROM 8 TO 25 PARTS BY WEIGHT OF ACETYLENE BLACK AND AT LEAST 150 PARTS BY WEIGHT OF A VOLATILE ORGANIC SOLVENT, THE COMPOSITION HAVING BEEN MILLED UNTIL THE VISCOSITY AND RESISTIVITY ATTAIN RELATIVELY CONSTANT VALUES, AND CURED FILMS OF THE COMPOSITION HAVING A RESISTIVITY OF FROM 3000 TO 6000 OHMS PER SQUARE OF SURFACE AREA.

3. AN ELECTRICAL WINDING COMPRISING, IN COMBINATION, AN ELECTRICAL CONDUCTOR HAVING A SLOT PORTION, ELECTRICAL INSULATION APPLIED TO THE ELECTRICAL CONDUCTOR AT THE SLOT PORTION, THE INSULATION INCLUDING AN EXTERIOR FIBROUS COVERING, AND A CURED RESISTANCE COMPOSITION APPLIED TO THE SLOT PORTION OF THE EXTERIOR FIBROUS COVERING, THE CURED RESISTANCE COMPOSITION COMPOSED OF A DRYING OIL MODIFIED GLYCEROL-PHTHALATE RESIN CONTAINING 45% TO 60% BY WEIGHT OF THE DRYING OIL, FROM 40% TO 30% BY WEIGHT OF PHTHALIC ANHYDRIDE AND FROM 10% TO 15% OF GLYCEROL, AND FROM 1/4 TO 1/12 OF ITS WEIGHT OF COLLOIDAL ACETYLENE BLACK, THE WHOLE HAVING BEEN MILLED TO A RELATIVELY CONSTANT VOLUME RESISTIVITY, THE FIBROUS COVERING SO TREATED HAVING A RESITIVITY OF 400 TO 2500 OHMS PER SQUARE OF SURFACE AREA.