Claims
- 1. A thermoplastic molding composition consisting of a blend of:(i) 60 to 80 percent polycarbonate resin; and (ii) 20 to 40 percent of a mixture of at least two grafted rubbers, said percents being in relation to the weight of the blend, wherein mixture (ii) contains, (a) a small-mode component containing a grafted rubber having a particle size, weight average, smaller than 0.3 microns, and (b) a large-mode component containing a grafted rubber having a particle size, weight average of 0.35 to 0.65 microns, further wherein said small-mode component (a) and said large-mode component (b) are present in the blend at a weight ratio of 3/27 to 7.5/22.5 therebetween, and said composition is free of flaky filler having an aspect ratio of at least 1.7 and particle size of 1-100 microns.
- 2. The thermoplastic molding composition of claim 1 wherein said blend contains 65 to 75 percent polycarbonate and 25 to 35 percent of said mixture.
- 3. The thermoplastic molding composition of claim 1 wherein the weight ratio of said small-mode component (a) and said large-mode component (b) of mixture (ii) is 3/27 to 5/25.
- 4. The thermoplastic molding composition of claim 1 wherein said small-mode component (a) is a product of emulsion polymerization.
- 5. The thermoplastic molding composition of claim 1 wherein said large-mode component (b) is a product of mass polymerization.
- 6. The thermoplastic molding composition of claim 1 wherein said large-mode component (b) is a product of continuous mass polymerization.
- 7. The thermoplastic molding composition of claim 1 wherein said small-mode component (a) has a particle size, weight average, of 0.15 to 0.28 microns.
- 8. The thermoplastic molding composition of claim 1 wherein said large-mode component (b) contains rubber at an amount of 14 to 20% relative to its weight.
- 9. The thermoplastic molding composition of claim 1 wherein said small-mode component (a) contains rubber at an amount of 50 to 60% relative to its weight.
- 10. The thermoplastic molding composition of claim 9 wherein said small-mode component (a) contains a grafted phase, polymerized monovinylidene aromatic hydrocarbons and polymerized unsaturated nitrites in a weight ratio of 70-80/30-20 therebetween.
- 11. The thermoplastic molding composition of claim 9 wherein said small-mode component (a) contains a grafted phase, polymerized monovinylidene aromatic hydrocarbons and polymerized unsaturated nitrites in a weight ratio of 75-78/25-22 therebetween.
- 12. The thermoplastic molding composition of claim 8 wherein said large-mode component (b) contains a grafted phase, polymerized monovinylidene aromatic hydrocarbons and polymerized unsaturated nitrites in a weight ratio of 70-80/30-20 therebetween.
- 13. The thermoplastic molding composition of claim 8 wherein said large-mode component (b) contains a grafted phase, polymerized monovinylidene aromatic hydrocarbons and polymerized unsaturated nitrites in a weight ratio of 75-78/25-22 therebetween.
CROSS REFERENCE TO RELATED PATENT APPLICATION
The present patent application is a Continuation-In-Part of and claims the right of priority under 35 U.S.C. §120 of U.S. patent application Ser. No. 09/276,215, filed Mar. 25,1999, now abandoned.
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/276215 |
Mar 1999 |
US |
Child |
09/711553 |
|
US |