Patent ID: 9085679
Filing Date: 2015-07-21
Classification: C01P,C08J,C08K,C08L,C09C,Y10T

Abstract:
1. A composite polymer modifier consisting of: a) from 99 to 1 weight percent of one or more inorganic mineral fillers wherein said one or more mineral fillers is selected from the group consisting of ground natural calcium carbonate (GCC), precipitated calcium carbonate (PCC), nanosized PCC (NPCC), fumed or precipitated silica, untreated clay, untreated Montmorillonite (nano-clay), zeolite, perlite, and mixtures thereof, b) from 1 to 99 weight percent of one or more polymeric process aids wherein said one or more process aids is an acrylic copolymer including one or more monomers selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethyl-hexyl-acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate,and having a molecular weight of 50,000 to 10,000,000 g/mol, and c) optionally from 0 to 80 weight percent of one or more polymeric impact modifiers, wherein said one or more polymeric impact modifiers is selected from the group consisting of core-shell impact modifiers, and linear copolymer impact modifiers, wherein the total adds up to 100 weight percent, and wherein said composite polymer modifier is in the form of powdered, substantially homogeneously blended complex particles containing both polymer and inorganic mineral fillers in intimate contact, and wherein said composite polymer modifier is formed by a process comprising the steps of: a) blending aqueous solutions, dispersions, suspensions or emulsions of said one or more polymeric process aids with said one or more mineral fillers which may be in the form of either an aqueous dispersion or a dry powder, and optionally with an aqueous dispersion of said one or more impact modifiers to form a homogenous aqueous blend, and b) powderizing said aqueous blend to form said composite polymer modifier.