Highly ductile polycarbonate composition having a metallic-flake appearance
View Patent ↗A polycarbonate composition comprising a polycarbonate-polysiloxane copolymer resin and a glass flake additive wherein the polycarbonate-polysiloxane copolymer resin has a silicone content in the range of from 3.5 weight % to 7 weight % based on the total weight of the polycarbonate composition and wherein the polycarbonate-polysiloxane copolymer has a haze of less than 10% and wherein the glass flake additive is present in the range of 0.025 weight % to 0.70 weight % based on the total weight of the polycarbonate composition.
1. A polycarbonate composition comprising a polycarbonate-polysiloxane copolymer resin and a metal oxide-coated glass platelet additive wherein the polycarbonate-polysiloxane copolymer resin has a silicone content in the range of from more than 3.5 weight % to 7 weight % based on the total weight of the polycarbonate composition, the polycarbonate-polysiloxane copolymer has a haze of less than 10%, the glass flake additive is present in the range of 0.35 weight % to 0.70 weight % based on the total weight of the polycarbonate composition, and wherein the silicone content and glass flake additive weight are sufficient such that the composition is at least 40% ductile at −20° C., and
wherein the polycarbonate-polysiloxane resin is produced from a polysiloxane of structure 1:
wherein each R may be the same or different and is selected from the group of radicals consisting of hydrogen, halogen, C (1-8) alkoxy, C (1-8) alkyl and C (6-13) aryl, R 1 is a C (2-8) divalent aliphatic radical, R 2 is selected from the same or different C (1-13) monovalent organic radicals, and n is an integer greater than or equal to 20 to 100.
2. The composition of claim 1 , which further comprises a second thermoplastic resin.
3. The composition of claim 2 , wherein the polycarbonate-polysiloxane copolymer resin is present in the range of from 98 weight % to 30 weight % based on the total weight of the polycarbonate composition.
4. The composition of claim 2 , wherein the second thermoplastic resin is bisphenol-A polycarbonate resin.
5. The composition of claim 4 , wherein the polycarbonate composition comprises from 98 total weight % to 30 total weight % of the polycarbonate-polysiloxane resin.
6. The composition of claim 1 , wherein n is an integer from 30 to 60.
7. The composition of claim 6 , wherein the polysiloxane resin of structure 1 is prepared from eugenol or allyl phenol.
8. The composition of claim 1 wherein the metal oxide coated glass platelet additive comprises calcium sodium borosilicate having a metal oxide coating.
9. The composition of claim 8 wherein the metal oxide coating is selected from the group consisting of titanium dioxide, tin oxide and iron oxide and mixtures thereof.
10. The composition of claim 8 , wherein the metal oxide-coated glass platelet additive has an average aspect ratio of from 3:1 to 80:1.
11. The composition of claim 8 , wherein the metal oxide-coated glass platelet additive has an aspect ratio of from 10:1 to 30:1.
12. The composition of claim 1 , wherein the polycarbonate-siloxane resin has a silicone content of from 4 weight % to 7 weight % based on the total weight of the polycarbonate composition.
13. A polycarbonate composition comprising a polycarbonate-polysiloxane copolymer resin and a metal-coated glass platelet additive wherein the polycarbonate-polysiloxane copolymer resin has a silicone content in the range of from more than 3.5 weight % to 7 weight % based on the total weight of the polycarbonate composition, the polycarbonate-polysiloxane copolymer has a haze of less than 10%, wherein the metal-coated glass platelet additive is present in the range of 0.35 weight % to 0.70 weight % based on the total weight of the polycarbonate composition, and wherein the silicone content and metal-coated glass platelet additive weight are sufficient such that the composition is at least 40% ductile at −20° C., and
wherein the polycarbonate-polysiloxane resin is produced from a polysiloxane of structure 1:
wherein each R may be the same or different and is selected from the group of radicals consisting of hydrogen, halogen, C (1-8) alkoxy, C (1-8) alkyl and C (6-13) aryl, R 1 is a C (2-8) divalent aliphatic radical, R 2 is selected from the same or different C (1-13) monovalent organic radicals, and n is an integer from 30 to 60.
14. The composition of claim 13 , wherein the metal-coated glass platelet additive comprises one or more metals selected from the group consisting of gold, silver, platinum, nickel, copper, chromium zinc and alloys thereof.
15. An article formed from the composition according to claim 1 .
16. An article formed from the composition according to claim 13 .