Method of electrodepositing quaternary sulfonium group-containing resins
AssigneePPG Industries, Inc.
InventorsJoseph F. Bosso, Marco Wismer
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Abstract
Synthetic resins containing quaternary sulfonium base groups are prepared by reacting an epoxy-group containing material with a sulfide in the presence of an acid. The resins may contain epoxy groups or they may be essentially epoxy-group free, and may optionally contain oxyalkylene groups. When dispersed in water, the aqueous dispersion preferably contains boron. The resultant dispersion can be applied to a wide variety of substrates by electrodeposition and will deposit on the cathode to provide coatings of unique properties, including high resistance to corrosion and staining.
Claims9
In a method of coating a conductive substrate serving as a cathode, which method comprises passing electric current between an anode and said cathode in electrical contact with a water-dispersed composition, the improvement wherein the water-dispersed composition is a water-dispersible, quaternary sulfonium salt-containing resin comprising the reaction product of:
- A. an epoxy group-containing organic material, and
- B. a sulfide-acid mixture, said sulfide acid mixture reacted with said organic material in an amount and at a temperature sufficient to provide a quaternary sulfinium salt-containing, water-dispersible resin.
Dependencies are inferred from the claim text.