High rubber impact modifier powders
AssigneeRohm and Haas Company
InventorsMorris Christopher Wills, Chuen-Shyong Chou, Karen Casey, Joseph Robert Adamo, Fanwen Zeng
Life of this patent
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Abstract
A powdery high rubber impact modifier composition containing two or more populations of polymer particles having a total rubbery weight fraction of greater than 90 weight percent is provided. Aqueous polymer particle dispersions for preparing these high rubber impact modifiers which can be spray dried to a powder are also provided. Also provided are polymeric compositions having a matrix resin component and the powdery high-rubber impact modifiers.
Claims17
A powdery impact modifier composition, comprising:
- (a) a first population of core/shell polymer particles, and
- (b) a second population of core/shell polymer particles,
- wherein the mean particle diameter of the first population of core/shell polymer particles is at least 50 percent larger than the mean particle diameter of the second population of core/shell polymer particles, and
- wherein the total rubbery weight fraction of the first and second populations of core/shell polymer particles is greater than 90 weight percent.
A spray-driable polymer particle dispersion, comprising:
- (a) water, and
- (b) core/shell polymer particles, the core/shell polymer particles comprising:
- (i) a first population of core/shell polymer particles, and
- (ii) a second population of core/shell polymer particles,
- wherein the mean particle diameter of the first population of core/shell polymer particles is at least 50 percent larger than the mean particle diameter of the second population of core/shell polymer particles, and
- wherein the total rubbery weight fraction of the first and second populations of core/shell polymer particles is greater than 90 weight percent.
A polymeric composition, comprising:
- (a) a matrix resin component, and
- (b) an impact modifier, the impact modifier comprising,
- (i) a first population of core/shell polymer particles, and
- (ii) a second population of core/shell polymer particles,
- wherein the mean particle diameter of the first population of core/shell polymer particles is at least 50 percent larger than the mean particle diameter of the second population of core/shell polymer particles, and
- wherein the total rubbery weight fraction of the first and second populations of core/shell polymer particles is greater than 90 weight percent.
Dependencies are inferred from the claim text.