| 摘要 |
<p>1432104 Powder coatings BAYER AG 31 May 1974 [1 June 1973] 24161/74 Headings C3R and C3B A powder lacquer binder comprises (A) a polyepoxide or a polyoxazoline and (B) a polyester containing free carboxyl groups and having an acid number of from 30 to 85 and a softening point above 40‹ C., being derived from (a) succinic acid anhydride, optionally in admixture with at least one other dicarboxylic acid anhydride in which case the mixture must contain at least 50 mol per cent succinic acid anhydride, and (b) a polyester having an OH number of from 40 to 100 and being derived from a polyol and a dicarboxylic acid. The examples describe compositions containing titanium dioxide, a levelling agent and a binder comprising (A) 1,4-bis-(2-oxazolinyl-2)-benzene or triglycidyl isocyanurate and (B) a polyester obtained by reacting succinic anhydride, optionally with phthalic anhydride with a polyester derived from (i) terephthalic acid, glycerol and bishydroxyethylbisphenol A or (ii) terephthalic acid, hexane-1,6-diol, neopentyl glycol and trimethylolpropane. The powder coating compositions may be applied to metal sheets. Reference has been directed by the Comptroller to Specification 1,381,262.</p> |
