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US 6,649,728 B2Granted
Catalyst for curing epoxy resins, method for making the same, epoxy resin composition, and powder coating composition
AssigneeNippon Chemical Industrial Co., Ltd.
InventorsHiroshi Kawakabe, Masashi Sugiya, Yoshifusa Hara
Life of this patent
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Abstract
A catalyst for curing epoxy resins comprises a tetraalkylphosphonium tetrafluoroborate represented by Formula (1): wherein R1, R2, R3, and R4 are each C1-C5 linear or branched alkyl and may be the same or different, and the halogen ion content in the tetraalkylphosphonium tetrafluoroborate is 20 ppm or less. An epoxy resin powder coating composition containing this catalyst exhibits a prolonged pot life and can be baked at decreased temperatures.
Claims6
A catalyst for curing epoxy resins comprising a tetraalkylphosphonium tetrafluoroborate represented by Formula (1):
- wherein R1, R2, R3, and R4 are each C1-C5 linear or branched alkyl and may be the same or different, and the halogen ion content in the tetraalkylphosphonium tetrafluoroborate is 20 ppm or less.
Dependencies are inferred from the claim text.