Iovu, Determination of the epoxide equivalent weight
(EEW) of epoxy resins with different chemical structure and functionality using GPC and 1H-NMR, Polym.
has been granted a patent for a powder coating composition comprised of a first component comprised of a melt-blended mixture of at least one glycidyl group-containing acrylic resin having an epoxide equivalent weight
of from approximately 250 to 1,500 and glass transition temperature of 30[degrees]C to 80[degrees]C and a curing agent selected from the group consisting of dicarboxylic acids, dicarboxylic acid anhydrides, and mixtures thereof; and a second component dry-blended with the first component, comprising at least one carboxyl-group containing material that has acid number of 10-300 and that is not substantially compatible with the first component.
Diglycidyl ether of bisphenol F (DGEBF, Resolution Performance Products, Houston, TX, epoxide equivalent weight = 172) was used as the main component.
In general, a higher glass transition temperature is obtained when the main component has a lower epoxide equivalent weight and higher epoxy functionality, because this results in a higher crosslink density .
The weight of DDM was affixed on epoxide equivalent weight
(EEW) of the ECN determined as per ASTM method D-1652.
c]>, 326 to 430 were prepared by incorporating advanced polymers of epoxide equivalent weight
(EEW) from 475 to 600 into a diglycidyl ether of bisphenol-A (DGEBA) of EEW 190.
97 Calculated %solids and [epoxide] for clearcoats of varying VOC content, with epoxide equivalent weights
of typical solid and LERs.