LOW GLOSS, HIGH IMPACT STRENGTH POWDER COATING RESINS

摘要

Advanced epoxy resins suitable for use in powder coatings are prepared by (I) polymerizing, in the presence of a suitable catalyst such as tertiary butyl perbenzoate, (A) the reaction product of (1) a diglycidyl ether of a dihydric phenol such as the diglycidyl ether of bisphenol A and with (2) a compound containing a group reactive with an epoxide group and a polymerizable ethylenically unsaturated group such as methacrylic acid; with (B) a monomer feed containing (1) at least one vinyl aromatic monomer such as styrene; (2) a compound containing a group reactive with an epoxide group and a polymerizable ethylenically unsaturated group such as methacrylic acid; and optionally (3) a hydroxyalkyl acrylate or methacrylate or an alkyl acrylate or methacrylate such as hydroxyethylacrylate; and (II) advancing, in the presence of a suitable 34,378-F advancement catalyst such as ethyltriphenylphosphonium acetate-acetic acid complex, the resultant polymerized product with (C) a dihydric phenol such as bisphenol A. 34,378-F