| 摘要 |
1531708 Curing epoxy resins DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT 12 Sept 1977 [13 Sept 1976] 37898/77 Heading C3B The cure of powder lacquers comprising epoxy resins and carboxyl group containing acrylic resins is accelerated by a mixture of: (I) 0À05- 3% of LiX where X is Cl, Br or the anion of an aliphatic or aromatic carboxylic acid; and (II) 0À5-5% of at least one quaternary ammonium compound in which R<SP>1</SP> is a C 8-30 saturated aliphatic radical, R<SP>2</SP>, R<SP>3</SP> and R<SP>4</SP> are each C 1-24 aliphatic, C 6-10 aryl or C 7-11 aralkyl radicals, or any two of R<SP>2</SP> to R<SP>4</SP> may together with the nitrogen atom form a 5-10 membered heterocyclic ring, or all the radicals R<SP>2</SP> to R<SP>4</SP> may together with the nitrogen atom form a pyridine ring, Y<SP>(-)</SP> is a monobasic inorganic or organic acid anion. The percentages are by weight based on the acrylic copolymer. Examples of (I) are LiCl, LiBr and lithium benzoate. Examples of (II) are dimethyldistearylammonium chloride, myristyldimethylbenzylammonium chloride, trimethylstearylammonium stearate and laurylpyridinium bisulphate. The acrylic copolymer may be polymerized in the presence of the accelerator mixture or of either component thereof. |
