FIELD: chemistry.
SUBSTANCE: powder coating composition is described comprising a carboxyl-functional polyester resin having an acid number of 45 to 65 and a melt viscosity of less than 500 poise at 150°C; a curing agent; optionally, a modification additive that increases the impact strength; and an onium ion-based catalyst. The composition has Tg of 50 to 70°C and is capable of curing at temperatures of 120 to 135°C.
EFFECT: powder coatings based on polyester resin are obtained that are cured at low temperature, have weathering and strength characteristics, without adverse affecting other coating properties, such as flexibility and gloss.
9 cl, 1 tbl, 1 ex
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