Synthesis of EA-AA Colloidal Unimolecular Polymer (CUP) Particles and Their Use as Freeze-thaw Stabilizer in Latex Paint

摘要

New regulations which reduce the level of volatile organic compounds (VOC) for architectural latex coatings usually necessitate a sacrifice in performance. The use of glycol has been shown to aid in both freeze-thaw and wet edge retention. Loss of this VOC will therefore compromise both. The new additive technology presented here replaces 8 - 15% of the resin with a new additive resin technology. The freeze-thaw stability goes from poor to excellent and with excellent wet edge retention. A third benefit was also identified in that the pigment mobility differential driven color shift often observed in the in-store tinting of paints caused by the use of hair dryers to accelerate the drying process which was virtually eliminated. Thus the color of the sample dried with the hair dryer will still match when dried at ambient by the customer, i.e., the delta E was less than the eye could detect. The paper will cover the science and application of the technology as well as the additives preparation. Viscometry, NMR and DSC data will be presented to explain the science of this new technology.