Anti-corrosive coating composition
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsHirohisa Maki, Takashi Sano, Misao Yamamoto
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Abstract
An anti-corrosive polyurethane coating composition which has excellent anti-corrosive property, water resistance, adhesive property to metals and impact resistance and can be coated thick in one coating operation, comprising (1) a polyol mixture of castor oil or a polyol derived from castor oil and an amine polyol produced by addition reaction of an alkylene oxide to a nitrogen-containing compound having at least 2 active hydrogen atoms such as ammonia, an aliphatic amine or an aromatic amine, the amine polyol having at least 2 hydroxyl groups and a hydroxyl value of at least 150 mgKOH/g, (2) a polyisocyanate compound, and optionally coal tar, an aromatic hydrocarbon oil or resin, or usual paint additives.
Claims4
An anti-corrosive coating composition consisting essentially of a non-foamed reaction product of:
- (1) a mixture of (a) a castor oil polyol and (b) an amine polyol produced by addition reaction of an alkylene oxide of the formula:
- ##STR2## wherein R.sup.1 and R.sup.2 are hydrogen, alkyl or aryl, provided that at least one of R.sup.1 and R.sup.2 is hydrogen,
- to a nitrogen-containing compound having at least 2 active hydrogen atoms, said amine polyol having at least 2 hydroxyl groups and a hydroxyl value of at least 150 mgKOH/g, the amount of said amine polyol being 5 to 70% by equivalent based on the total polyol;
- and
- (2) a polyisocyanate compound, the amount of said polyisocyanate compound being such that the ratio of isocyanato group to the active hydrogen of the polyol is from 0.85 to 1.15:1 by equivalent.
Dependencies are inferred from the claim text.