Polycarbonate compositions having infrared absorbance, method of manufacture, and articles prepared therefrom
View Patent ↗A composition is disclosed, comprising a polycarbonate resin, an inorganic infrared shielding additive, and carbon black, wherein an article prepared from the composition has the inorganic infrared shielding additive present at about 0.01 to about 1.0 grams per square meter, and carbon black present at about 0.001 to about 2.0 grams per square meter. The article prepared from the composition meets at least one scale requirement for European Norm EN 169 and/or EN 171, and is useful for preparing infrared shielding protective eyewear with low haze.
1. A composition comprising:
about 70 to about 99.9 percent by weight of a polycarbonate resin,
about 0.000075 to about 1 percent by weight of an inorganic infrared shielding additive comprising a metal boride, metal tungsten oxide, or combination thereof, and
about 0.0001 to about 2.7 percent by weight carbon black,
wherein the weight ratio of inorganic infrared shielding additive to carbon black is about 0.001:1 to about 70:1,
wherein all percents by weight are based on the total weight of the composition,
wherein the composition has inorganic infrared shielding additive present at about 0.01 to about 1.0 grams per square meter, carbon black present at about 0.001 to about 2.0 grams per square meter, and a haze of less than about 5% as measured at a thickness when molded of about 2.5 mm according to ASTM D 1003-00, and
the composition has a melt volume rate of about 1 to about 8 grams per 10 minutes flow as determined at 300° C. and 1.2 Kg according to ISO 1133,
and further wherein the respective amounts of inorganic infrared shielding additive and carbon black are effective to meet the requirements for at least one scale of European Norm EN 169 and EN 171 , while providing lower haze or lower melt volume rate or both lower haze and lower melt volume rate than the composition would exhibit if it utilized the inorganic infrared shielding additive as its only infrared absorber in an amount sufficient to meet said at least one scale of European Norm EN 169and/or EN 171.
2. The composition of claim 1 wherein the polycarbonate resin comprises bisphenol-A polycarbonate.
3. The composition of claim 1 wherein the inorganic infrared shielding additive is selected from LaB 6 , NdB 6 , PrB 6 , CeB 6 , GdB 6 , TbB 6 , DyB 6 , HoB 6 , YB 6 , SmB 6 , EuB 6 , LaB 6 , TmB 6 , YbB 6 , LuB 6 , SrB 6 , TiB 2 , ZrB 2 , HfB 2 , VB 2 , TaB 2 , CrB, CrB 2 , MoB 2 , Mo 2 B 5 , MoB, W 2 B 5 , K(WO 3 ) 3 , Rb(WO 3 ) 3 , Cs(WO 3 ) 3 , Tl(WO 3 ) 3 or a combination comprising at least one of the foregoing inorganic infrared shielding additives.
4. The composition of claim 1 , wherein the ratio of inorganic infrared shielding additive to carbon black is from 0.2769 to 5.7143.
5. The article of claim 4 , wherein the inorganic infrared shielding additive comprises LaB 6 .
6. The article of claim 1 , wherein the inorganic infrared shielding additive comprises LaB 6 .
7. An article comprising the composition of claim 1 .
8. The article of claim 7 wherein the article is protective eyewear.
9. The article of claim 7 , wherein the carbon black is present in an amount of 0.011 to 1.54 g/m 2 .
10. The article of claim 7 , wherein the ratio of inorganic infrared shielding additive to carbon black is from 0.2769 to 5.7143.
11. The article of claim 10 , wherein the inorganic infrared shielding additive comprises LaB 6 .
12. An article comprising a layer of a composition, wherein the composition comprises:
about 70 to about 99.9 percent by weight of a polycarbonate resin,
about 0.000075 to about 1 percent by weight of an inorganic infrared shielding additive comprising a metal boride, metal tungsten oxide, or combination thereof, and
about 0.0001 to about 2.7 percent by weight carbon black,
wherein all percents by weight are based on the total weight of the composition,
wherein the weight ratio of inorganic infrared shielding additive to carbon black is about 0.001:1 to about 70:1,
wherein the layer has the inorganic infrared shielding additive present at about 0.01 to about 1.0 grams per square meter and has the carbon black present at about 0.001 to about 2.0 grams per square meter, has a haze of less than about 5% as measured at a thickness of about 2.5 mm according to ASTM D1003-00, and
the composition has a melt volume rate of about 1 to about 8 grams per 10 minutes flow as determined at 300° C. and 1.2 Kg according to ISO 1133,
and further wherein the respective amounts of inorganic infrared shielding additive and carbon black are effective to meet the requirements for at least one scale of European Norm EN 169 and/or EN 171, while providing lower haze or lower melt volume rate or both lower haze and lower melt volume rate than the composition would exhibit if it utilized the inorganic infrared shielding additive as its only infrared absorber in an amount sufficient to meet said at least one scale of European Norm EN 169 and/or EN 171.
13. An article comprising a composition, wherein the composition comprises:
about 70 to about 99.9 percent by weight of a polycarbonate resin,
about 0.000075 to about 1 percent by weight of an inorganic infrared shielding additive comprising a metal boride, metal tungsten oxide, or combination thereof, and
about 0.0001 to about 2.7 percent by weight carbon black,
wherein all percents by weight are based on the total weight of the composition,
wherein the weight ratio of inorganic infrared shielding additive to carbon black is about 0.001:1 to about 70:1,
wherein the article prepared from the composition has a haze of less than about 5% as measured at a thickness of about 2.5 mm according to ASTM D1003-00, and
the composition has a melt volume rate of about 1 to about 8 grams per 10 minutes flow as determined at 300° C. and 1.2 Kg according to ISO 1133
and further wherein the respective amounts of inorganic infrared shielding additive and carbon black are effective to meet the requirements for at least one scale of European Norm EN 169 and/or EN 171, while providing lower haze or lower melt volume rate or both lower haze and lower melt volume rate than the composition would exhibit if it utilized the inorganic infrared shielding additive as its only infrared absorber in an amount sufficient to meet said at least one scale of European Norm EN 169 and/or EN 171.
14. The article of claim 13 , wherein the carbon black is present in an amount of 0.011 to 1.54 g/m 2 .
15. The article of claim 13 , wherein the ratio of inorganic infrared shielding additive to carbon black is from 0.2769 to 5.7143.
16. The article of claim 15 , wherein the inorganic infrared shielding additive comprises LaB 6 .
17. A masterbatch comprising:
a carrier resin comprising a polycarbonate resin, and
an infrared shielding additive package, comprising:
an inorganic infrared shielding additive comprising a metal boride, metal tungsten oxide, or combination thereof, and
carbon black,
wherein the weight ratio of inorganic infrared shielding additive to carbon black in the infrared shielding additive package is about 0.001:1 to about 70:1, and wherein the infrared shielding additive package is present in the masterbatch in an amount of about 0.0001 to about 20 wt % of the combined weights of the carrier resin and infrared shielding additive package,
wherein the masterbatch, when combined with a base resin in an amount of about 5 to about 20 wt % based on the combined weight of the masterbatch and the base resin, and having inorganic infrared shielding additive present at about 0.01 to about 1.0 grams per square meter, and carbon black present at about 0.001 to about 2.0 grams per square meter, has a haze of less than about 5% as measured at a thickness when molded of about 2.5 mm according to ASTM D1003-00, and
the composition has a melt volume rate of about 1 to about 8 grams per 10 minutes flow as determined at 300° C and 1.2 Kg according to ISO 1133
and further wherein the respective amounts of inorganic infrared shielding additive and carbon black are effective to meet the requirements for at least one scale of European Norm EN 169 and/or EN 171, while providing lower haze or lower melt volume rate or both lower haze and lower melt volume rate than the composition would exhibit if it utilized the inorganic infrared shielding additive as its only infrared absorber in an amount sufficient to meet said at least one scale of European Norm EN 169 and/or EN 171.
18. The masterbatch of claim 17 wherein the inorganic infrared shielding additive is selected from LaB 6 , NdB 6 , PrB 6 , CeB 6 , GdB 6 , TbB 6 , DyB 6 , HoB 6 , YB 6 , SmB 6 , EuB 6 , LaB 6 , TmB 6 , YbB 6 , LuB 6 , SrB 6 , TiB 2 , ZrB 2 , HfB 2 , VB 2 , TaB 2 , CrB, CrB 2 , MoB 2 , Mo 2 B 5 , MoB, W 2 B 5 , K(WO 3 ) 3 , Rb(WO 3 ) 3 , Cs(WO 3 ) 3 , Tl(WO 3 ) 3 , or a combination comprising at least one of the foregoing inorganic infrared shielding additives.
19. A composition comprising the masterbatch of claim 17 .