Compositions containing polycarbonate and grafted rubber having improved low-temperature toughness
AssigneeBayer Aktiengesellschaft
InventorsLora L. Spangler, Venkatarayaloo Janarthanan
Life of this patent
Estimating the term…
Abstract
A thermoplastic molding composition suitable for preparing molded articles having improved properties, most notably high ductility and impact strength at low temperature, is disclosed. The composition contains a resinous blend of aromatic polycarbonate and a mixture of at least two grafted rubbers. The mixture of grafted rubbers contains a “small-mode” component having a weight average particle size of less than 0.3 microns and a “large-mode” component having a weight average particle size of 0.3 microns or larger. The inventive composition is characterized in the absence of flaky filler having an aspect ratio is at least 1.7 and particle size of 1-100 microns therefrom.
Claims13
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.
Dependencies are inferred from the claim text.