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US 4,038,232 AGranted
Electrodepositable compositions containing sulfonium resins and capped polyisocyanates
AssigneePPG Industries, Inc.
InventorsJoseph F. Bosso, Marco Wismer
Life of this patent
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Abstract
It has been found that aqueous coating compositions comprising a blocked organic polyisocyanate and quaternary sulfonium group-containing resin containing isocyanate reactive groups can be electrodeposited. These compositions deposit on the cathode to provide coatings having excellent properties including solvent resistance, salt spray and detergent resistance, hardness, flexibility, and most importantly a resistance to yellowing, especially when used to formulate white or pastel coatings.
Claims14
An aqueous based resinous dispersion suitable for use as a coating composition comprising as the resinous phase:
- A. a quaternary sulfonium salt group solubilized synthetic organic resin containing free hydroxyl groups, said organic resin produced by reacting:
- 1. an epoxy-containing organic material having a 1,2-epoxy equivalency of greater than 1, and
- 2. a sulfide-acid mixture, said sulfide-acid mixture being used in an amount to provide sufficient quaternary sulfonium groups to solubilize said resin;
- said sulfide being selected from the group consisting of aliphatic, mixed aliphatic-aromatic, aralkyl and cyclic sulfides;
- and
- B. a capped, organic polyisocyanate stable at ordinary room temperature in the presence of said resin (A) and reactive with said resin (A) at elevated temperatures.
3 more elements
Dependencies are inferred from the claim text.