Carbodiimide driers for resin coating compositions
AssigneeAshland Oil, Inc.
InventorRay C. Hamon
Life of this patent
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Abstract
New coating compositions having controllable drying time and capable of drying rapidly at ambient temperatures without substantial evolution of gaseous by-products caused by conventional driers such as melamines or urea formaldehyde comprising carbodiimides or homologies of carbodiimides together with organic carboxylates. These compositions are particularly useful in providing fast-drying long-oil alkyds which form coatings exhibiting excellent hardness, toughness and resistance to humidity and salt spray.
Claims17
A controllable drying-time, water-based or organic solvent-based alkyd composition which dries rapidly at ambient temperature without substantial evolution of gaseous by-products and is capable of application and flow on a solid substrate, comprising:
- (A) about 0.1 to 40.0% by weight of a drying agent selected from the group comprising carbodiimides, polycarbodiimides and substituted polycarbodiimides;
- (B) about 60 to 99.5% by weight of an organic carboxylate selected from the group comprising alkyds, polyesters, acrylics, epoxides, phenolics, modified acrylics, modified vinyls and urethanes;
- said carboxylate being present in at least the stochiometric quantity required to react with said drying agent;
- (C) about 0 to 90.0% by weight of a solvent selected from the group consisting of water, and organic solvents;
A method of producing an anti-corrosive, controllable drying-time, water-based or organic solvent-based alkyd composition which dries rapidly at ambient temperature without substantial evolution of gaseous by-products and is capable of application and flow on a solid substrate, said method comprising the following steps:
- (A) mixing and and in an essentially fluid state a drying agent selected from the group comprising carbodiimides, polycarbodiimdes and substituted polycarbodiimides;
- (B) an organic carboxylate selected from the group comprising alkyds, polyesters, acrylics, epoxides, phenolics, modified acrylics, modified vinyls and urethanes;
- said carboxylate being present in at least the stochiometric quantity required to react with said drying agent;
- (C) a substantial quantity of water or an organic solvent;
- (D) neutralizing to a pH of about 7 to 11 with amine;
- (E) adding water or organic solvent with agitation at such temperatures so as to cause dispersion of the mixture;
- and
- (F) adjusting the pH of the total mixture from about 7 to about 11.
Dependencies are inferred from the claim text.