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US 5,688,905 AGranted
Primary-tertiary diamines mixed with polyamines as epoxy resin hardeners
AssigneeAir Products and Chemicals, Inc.
InventorFrederick Herbert Walker
Life of this patent
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AssigneeAir Products and Chemicals, Inc.
InventorFrederick Herbert Walker
Estimating the term…
An amine hardener composition for curing epoxy resin based coatings and related products comprising (A) from 5 to 75% of a diamine which possesses a vapor pressure less than about 133 Pascals at 20.degree. C., contains both a primary and a tertiary amine and corresponds to either of the structures: ##STR1## where R.sub.1 and R.sub.2 are independently C.sub.1 -C.sub.8 alkyl; X is --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.sub.2 --, or --CH.sub.2 --O--CH.sub.2 --; and n is 2-6, (B) from 5 to 95% of a polyamide, amidoamine, Mannich base or cycloaliphatic amine curing agent; and (C) from 0 to 50% of other active hydrogen containing dismines or polyamines. Coatings based on the composition can be formulated at up to 100% solids, and have an excellent combination of pot life and dry speed.
An amine hardener composition for curing epoxy resin based coatings comprising (A) 5 to 75 wt. % of a diamine which possesses a vapor pressure less than about 133 Pascals at 20.degree. C., contains both a primary amine and a tertiary amine and corresponds to either of the structures I and II:
An amine hardener composition for curing epoxy resin based coatings comprising (A) 25 to 70 wt. % of a diamine which possesses a vapor pressure less than about 100 Pascals at 20.degree. C., contains both a primary amine and a tertiary amine and corresponds to either of the structures I and II:
An amine hardener composition for curing epoxy resin based coatings comprising (A) 25 to 70 wt. % of a diamine which possesses a vapor pressure less than about 50 Pascals at 20.degree. C., contains both a primary amine and a tertiary amine and corresponds to structure II:
Dependencies are inferred from the claim text.