| 摘要 |
New siloxane-esters, useful as powder coating resins, are prepared by random condensation polymerization of a hindered glycol and a hydroxy functional silicone having about two <IMAGE> groups per molecule wherein R is lower alkyl or phenyl groups and the remaining silicone valences form ring-structured siloxanes. Improved powder properties, including tack temperatures of 150 DEG F. to 220 DEG F., are believed to result in part from the hindered glycols especially those having carboxylic functionality. |
