Processes for preparing multimodal polymer particle compositions
AssigneeRohm and Haas Company
InventorsRaymond Gerard Hamilton, Morris Christopher Wills, Kirk Harold Moyer, Jennifer Lynn Petoff, Joseph Robert Adamo
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Abstract
A multimodal polymer particle composition containing two or more populations of polymer particles having a total rubbery weight fraction of less than 90 weight percent is provided. Also disclosed is a process for preparing multimodal polymer particle compositions that can be dried to a powder. Multimodal polymer particle dispersions are disclosed for preparing impact modifiers that can be dried to a powder. Also provided are polymeric compositions having a matrix resin component and impact modifiers prepared from multimodal polymer particles.
Claims10
A process for preparing a multimodal polymer particle composition, comprising the steps of:
- (I) providing a multimodal polymer particle dispersion, said dispersion comprising:
- (a) a larger mode of polymer particles, and
- (b) a smaller mode of polymer particles,
- wherein the mean particle size of the larger mode of polymer particles is at least 50 percent larger than the mean particle size of the smaller mode of particles, said smaller mode of polymer particles having a mean particle size of greater than 200 nm,
- and wherein the total rubbery weight fraction of the larger and smaller modes of polymer particles is at most 90 weight percent;
- and
- (II) drying the multimodal polymer particle dispersion.
A process for preparing a high-rubber, high-solids multimodal polymer particle powder, comprising the steps of:
- (I) preparing a high-rubber high-solids multimodal polymer particle dispersion using a gradual addition polymerization method, said dispersion comprising:
- (a) a larger mode of polymer particles, and
- (b) a smaller mode of polymer particles,
- wherein the total rubbery weight percentage of the polymer particles is up to 95 percent, based on total weight of polymer particles,
- wherein the total solids weight fraction of the dispersion is at least 50 weight percent,
- and wherein the mean particle size of the larger mode of polymer particles is at least 50 percent larger than the mean particle size of the smaller mode of particles;
- and
- (II) spray-drying the multimodal polymer particle dispersion to a compaction-free powder.
Dependencies are inferred from the claim text.