Claims
- 1. 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.
- 2. A powdery impact modifier composition as recited in claim 1, further comprising a flow aid.
- 3. A powdery impact modifier composition as recited in claim 1, wherein the first population of core/shell polymer particles has a mean particle diameter in the range of from 10 nm to 5,000 nm.
- 4. A powdery impact modifier composition as recited in claim 1, wherein the total rubbery weight fraction of the first and second populations of core/shell polymer particles is less than 100 percent.
- 5. A powdery impact modifier composition as recited in claim 2, wherein the amount of the flow aid is at least 1.5 weight percent based on the total weight of the powdery impact modifier composition.
- 6. 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.
- 7. A spray-driable plastics additive polymer particle dispersion as recited in claim 6, wherein the core/shell polymer particles are present in an amount of more than 40 weight percent, said weight percentage being based on the total weight of the polymer particle dispersion.
- 8. A spray-driable plastics additive polymer particle dispersion as recited in claim 6, wherein the dispersion has a viscosity of less than 2,000 centipoise.
- 9. A spray-driable plastics additive polymer particle dispersion as recited in claim 6 further comprising a third population of core/shell polymer particles.
- 10. 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.
- 11. The composition or dispersion of any of claims 1 to 9, wherein the total rubbery weight fraction of the first and second populations of core/shell polymer particles is 92 to 98 weight percent.
- 12. The composition or dispersion of any of claims 1 to 9, wherein the mean particle diameter of the first population of core/shell polymer particles is 100 to 1,000 percent larger than the mean particle diameter of the second population of core/shell polymer particles.
- 13. The composition or dispersion of any of claims 1 to 9, wherein the mean particle diameter of the first population of core/shell polymer particles is 200 to 300 percent larger than the mean particle diameter of the second population of core/shell polymer particles.
- 14. The composition or dispersion of any of claims 1 to 9, wherein the mean particle diameter of the first population of core/shell polymer particles is 700 to 1,000 percent larger than the mean particle diameter of the second population of core/shell polymer particles.
- 15. The composition or dispersion of any of claims 1 to 9, wherein the mean particle diameter of the first population of core/shell polymer particles is 300 to 600 nm and the mean particle diameter of the second population is 100 to 150 nm.
- 16. The composition or dispersion of any of claims 1 to 9, wherein the mean particle diameter of the first population of core/shell polymer particles is 225 to 275 nm and the mean particle diameter of the second population is 300 to 350 nm or 500 to 600 nm.
- 17. The composition or dispersion of any of claims 1 to 9, wherein the rubber component is formed from a monomer composition comprising butyl acrylate and the shell is formed from a monomer composition comprising methyl methacrylate.
CROSS REFERENCE TO RELATED PATENT APPLICATIONS
This application claims the benefit of the filing date of U.S. provisional application Ser. No. 60/243,488, filed Oct. 25, 2000.
US Referenced Citations (12)
Foreign Referenced Citations (7)
Number |
Date |
Country |
0 190 884 |
Apr 1990 |
EP |
0 279 724 |
Apr 1993 |
EP |
0 418 042 |
Feb 1994 |
EP |
0 522 791 |
Mar 1996 |
EP |
0 620 236 |
Jan 1998 |
EP |
WO 9909080 |
Feb 1999 |
WO |
WO 9909081 |
Feb 1999 |
WO |
Non-Patent Literature Citations (1)
Entry |
European Equivallent for US patent application No. 09/981,348 EP 1 201 701 A2, which contains search report, Feb. 5, 2002. |
Provisional Applications (1)
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Number |
Date |
Country |
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60/243488 |
Oct 2000 |
US |