Polyamine condensates of styrene-acrylic acid copolymers as corrosion inhibitors
AssigneeWestvaco Corporation
InventorPeter Schilling
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Abstract
Corrosion inhibiting compositions for metals subjected to highly acidic environments may be produced by reacting in a condensation reaction a styrene-acrylic acid copolymer with a polyamine (or combination of polyamines) to produce a polyamidoamine inhibitor. A preferred inhibitor product may be produced by replacing up to 80% of the styrene-acrylic acid copolymer with a member selected from the group consisting of: rosin, C.sub.23 -C.sub.24 modified rosins, C.sub.8 -C.sub.20 fatty acids, C.sub.9-C.sub.22 modified fatty acids, and combinations thereof. These inhibitors exhibit excellent film forming and film persistency characteristics.
Claims6
A composition for inhibiting the corrosion of metals in highly acidic environments comprising the polyamidoamine condensation reaction product of:
- (a) 20-80 wt. % of a copolymer formed by reacting 1-99 wt. % of .alpha.-methyl styrene in a polymerization reaction with 99-1 wt. % of a member selected from the group consisting of acrylic acid, methacrylic acid, and combinations thereof;
- with
- (b) 80-20 wt. % of a polyamine.
Dependencies are inferred from the claim text.