Patent ID: 8729173
Filing Date: 2014-05-20
Classification: B82Y,C08J,C08L,C09D

Abstract:
1. An aqueous polymer dispersion comprising a mixture of (a) a primary aqueous dispersion containing primary polymer particles formed from a polymer having a lower glass transition temperature and (b) solvent softened polymer nanoparticles formed from a polymer having a higher glass transition temperature, the higher glass transition temperature being at least 10° C. greater than the lower glass transition temperature, the polymer nanoparticles being softened with a softening solvent, wherein the aqueous dispersion is made by a process in which the solvent softened polymer nanoparticles are softened with the softening solvent before being combined with the primary aqueous dispersion so that the amount of softening solvent present in the aqueous polymer dispersion is substantially less than would be present in an otherwise identical aqueous polymer dispersion in which the solvent softened polymer nanoparticles were solvent softened after combining with the primary aqueous dispersion.