Polysiloxane-polycarbonate copolymer article
View Patent ↗Disclosed herein are polysiloxane-polycarbonate copolymer articles. In one embodiment, a ⅛ th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75. This article, which has a dimension that is greater than or equal to 1.5 cm, comprises the thermoplastic composition which comprises a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1): wherein each R is, independently, a C 1-13 monovalent organic group; and E has an average value of 20 to 35.
1. An article, comprising:
a thermoplastic composition comprising
a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1):
wherein each R is, independently, a C 1-13 monovalent organic group, each occurrence of R 1 is independently a divalent C 1 -C 30 alkylene, and E has an average value of about 20 to about 35;
wherein the article is transparent and has a dimension that is greater than or equal to about 1.5 cm;
wherein the thermoplastic composition is defined in that an ⅛ th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75, wherein the B-Y ratio is determined as a B-Y span of a molded part formed from the thermoplastic composition divided by a B-Y span of a molded part formed from a siloxane-free thermoplastic composition, the siloxane-free thermoplastic composition having a composition identical to that of the thermoplastic composition except for the omission of the diorganosiloxane units; and
wherein the thermoplastic composition has about 2 wt % to about 6 wt % polysiloxane.
2. The article of claim 1 , wherein the bar has 100% ductility at −20° C. in accordance with ASTM D256-05 with an impact energy of at least 10 ft-lb/in.
3. The article of claim 2 , wherein the bar has 100% ductility at −30° C.
4. The article of claim 1 , wherein the B-Y ratio is less than or equal to about 1.6.
5. The article of claim 4 , wherein the B-Y ratio is less than or equal to about 1.5.
6. The article of claim 5 , wherein the B-Y ratio is less than or equal to about 1.2.
7. The article of claim 1 , wherein the dimension is greater than or equal to about 2.5 cm.
8. The article of claim 1 , wherein the thermoplastic composition comprises about 3 wt % to about 5 wt % polysiloxane.
9. The article of claim 1 , wherein the E has an average value of about 25 to about 35.
10. The article of claim 9 , wherein the E has an average value of about 30 to about 35.
11. The article of claim 9 , wherein the E has an average value of about 25 to about 30.
12. An article, comprising:
a thermoplastic composition comprising
a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1):
wherein each R is, independently, a C 1-13 monovalent organic group, each occurrence of R 1 is independently a divalent C 1 -C 30 alkylene, and E has an average value of about 25 to about 35;
wherein the article has a dimension having a cross-section that is greater than or equal to 1.5 cm; and
wherein the composition is defined in that a ⅛ th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.6, wherein the B-Y ratio is determined as a B-Y span of a molded part formed from the thermoplastic composition divided by a B-Y span of a molded part formed from a siloxane-free thermoplastic composition, the siloxane-free thermoplastic composition having a composition identical to that of the thermoplastic composition except for the omission of the diorganosiloxane units.
13. The article of claim 12 , wherein the bar has 100% ductility at −0° C. in accordance with ASTM D256-05 with an impact energy of at least 10 ft-lb/in.
14. The article of claim 13 , wherein the bar has 100% ductility at −10° C. in accordance with ASTM D256-05 with an impact energy of at least 10 ft-lb/in.
15. The article of claim 12 , wherein the thermoplastic composition comprises about 2 wt % to about 5 wt % polysiloxane, based upon a total weight of the copolymer.
16. The article of claim 15 , wherein the thermoplastic composition comprises about 3 wt % to about 5 wt % polysiloxane.
17. The article of claim 15 , wherein the E has an average value of about 30 to about 35.
18. The article of claim 15 , wherein the E has an average value of about 25 to about 30.
19. The article of claim 15 , wherein the B-Y ratio is less than or equal to about 1.5.
20. The article of claim 15 , wherein the B-Y ratio is less than or equal to about 1.2.
21. A method of forming an article, the method comprising:
disposing a thermoplastic composition, the thermoplastic composition comprising a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1):
wherein each R is, independently, a C 1-13 monovalent organic group, each occurrence of R 1 is independently a divalent C 1 -C 30 alkylene, and E has an average value of greater than or equal to 20 to less than or equal to 35; wherein the article is transparent and has a dimension that is greater than or equal to about 1.5 cm; wherein the thermoplastic composition is defined in that an ⅛ th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75, wherein the B-Y ratio is determined as a B-Y span of a molded part formed from the thermoplastic composition divided by a B-Y span of a molded part formed from a siloxane-free thermoplastic composition, the siloxane-free thermoplastic composition having a composition identical to that of the thermoplastic composition except for the omission of the diorganosiloxane units; and wherein the thermoplastic composition has about 2 wt % to about 6 wt % polysiloxane; and
forming an article.