Compatibilized silica and polymer silica-reinforced masterbatch containing same
AssigneeDSM Copolymer, Inc.
InventorsJohn W. Lightsey, David J. Kneiling, John M. Long, Andrew C. Kolbert
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Abstract
A compatibilized silica for incorporation into natural and synthetic polymers in latex form or dry blending operations is described. Said compatibilized silica is formed by the reaction of precipitated or fumed silica with organosilicon coupling compounds in aqueous suspension. Polymer-silica reinforced masterbatches are prepared by addition of the compatibilized silica slurry to natural and synthetic polymer latices. Also described is a process for preparing the compatibilized silica.
Claims18
A compatibilized silica useful for blending with organic polymers comprising silica with at least 1 wt % of an organosilicon chemically bound to the surface, which organosilicon is derived from an organic silane having the structure ##STR2## wherein X is a functional group selected from the group consisting of an amino group, a polyamino alkyl group, a mercapto group, a polysulfide, a thiocyanato group, an epoxy group, a vinyl group, a halogen, an acryloxy group and a methacryloxy group;
- y is an integer equal to or greater than 0;
- and Z.sub.1, Z.sub.2 and Z.sub.3 are each independently selected from the group consisting of hydrogen, alkoxy, halogen, and hydroxy, wherein the organosilicon is present as an average tetrameric structure having a T.sup.3 /T.sup.2 ratio of 0.75 or greater as measured by .sup.29 Si CPMAS NMR.
A polymer silica masterbatch comprising the blend of a natural or synthetic polymer with 5-80 wt % of a compatibilized silica having at least 1 wt % of an organosilicon chemically bound to its surface wherein the organosilicon is present as an average tetrameric structure having a T.sup.3 /T.sup.2 ratio of 0.75 or greater as measured by .sup.29 Si CPMAS NMR.
Dependencies are inferred from the claim text.