Transparent polymeric compositions comprising polysiloxane-polycarbonate copolymer, articles made therefrom and methods of making same
View Patent ↗A composition made from a transparent polysiloxane-polycarbonate copolymer and styrene-acrylonitrile copolymer (SAN) and, optionally, polycarbonate, the composition being transparent. A thin-walled article may be made from such a composition. A transparent composition made by combining a transparent polysiloxane-polycarbonate copolymer with styrene-acrylonitrile copolymer (SAN) and, optionally, polycarbonate, to produce a transparent composition. An article made by forming a transparent composition comprising a transparent polysiloxane-polycarbonate copolymer, styrene-acrylonitrile copolymer (SAN) and, optionally, polycarbonate into an article.
1. A composition comprising:
a transparent polysiloxane-polycarbonate copolymer comprising 2 wt % to 10 wt % siloxane, wherein the transparent polysiloxane-polycarbonate copolymer comprises polydiorganosiloxane units of formula (10):
wherein each occurrence of R 3 is the same or different and is selected from C 1-13 monovalent organic radicals, each occurrence of R 4 is independently a divalent C 1 -C 30 hydrocarbon, and D is 1 to 1,000; and
styrene-acrylonitrile copolymer (SAN);
and, optionally, polycarbonate;
wherein the SAN comprises not more than 25 wt % acrylonitrile, and the composition is transparent, having a haze of not more than 45% and a light transmission of at least 55%, per ASTM-D1003-61.
2. The composition of claim 1 , comprising 0.1 wt % to 50 wt % SAN.
3. The composition of claim 2 , comprising 0.1 wt % to 20 wt % SAN.
4. The composition of claim 1 , comprising 0.1 wt % to 20 wt % polycarbonate.
5. The composition of claim 1 , wherein the polysiloxane-polycarbonate copolymer comprises 4 wt % to 8 wt % siloxane.
6. The composition of claim 1 , comprising at least 50 wt % polysiloxane-polycarbonate copolymer.
7. The composition of claim 1 , comprising more than 0.5 wt % to 20 wt % SAN.
8. The composition of claim 1 , wherein the SAN has a refractive index of not more than 1.57.
9. The composition of claim 1 , having a haze of not more than 10% per ASTM-D1003-61.
10. The composition of claim 1 , having a light transmission of at least 60% per ASTM-D-1003-61.
11. An article comprising the composition of claim 1 .
12. The composition of claim 1 , wherein each occurrence of R 4 independently has structure (11):
wherein each occurrence of R 6 is independently H or C 1 -C 12 hydrocarbyl, each R 5 is the same or different, and is a halogen, cyano, nitro, C 1 -C 8 alkylthio, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, C 2 -C 8 alkenyl, C 2 -C 8 alkenyloxy group, C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkoxy, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 7 -C 12 aralkyl, C 7 -C 12 aralkoxy, C 7 -C 12 alkaryl, or C 7 -C 12 alkaryloxy, b is 1 to 8, a is independently 0, 1, 2, 3, or 4, and when a is less than 4, a hydrogen is substituted to the aromatic ring such that the total number of hydrogens on the aromatic ring is 4-a, and the aryl end of formula (11) has connectivity to an oxygen atom, and the alkyl end of formula (11) has connectivity to a silicon atom.
13. A method for making a composition, consisting essentially of combining a transparent polysiloxane-polycarbonate copolymer comprising 2 wt % to 10 wt % siloxane, wherein the transparent polysiloxane-polycarbonate copolymer comprises polydiorganosiloxane units of formula (10):
wherein each occurrence of R 3 is the same or different and is selected from C 1-13 monovalent organic radicals, each occurrence of R 4 is independently a divalent C 1 -C 30 hydrocarbon, and D is 1 to 1,000, with styrene-acrylonitrile copolymer (SAN), wherein the SAN comprises not more than 25 wt % acrylonitrile, and, optionally, polycarbonate, to produce a transparent composition, having a haze of not more than 45% and a light transmission of at least 55%, per ASTM-D1003-61.
14. The method of claim 13 , wherein the composition comprises 0.1% to 50 wt % SAN and up to 20 wt % polycarbonate.
15. A method for making an article, comprising making a composition having a haze of not more than 45% and a light transmission of at least 55% per ASTM-D1003-61, by combining a transparent polysiloxane-polycarbonate copolymer comprising 2 wt % to 10 wt % siloxane, wherein the transparent polysiloxane- polycarbonate copolymer comprises polydiorganosiloxane units of formula (10):
wherein each occurrence of R 3 is the same or different and is selected from C 1-13 monovalent organic radicals, each occurrence of R 4 is independently a divalent C 1 -C 30 hydrocarbon, and D is 1 to 1,000,
styrene-acrylonitrile copolymer (SAN) wherein the SAN comprises not more than 25 wt % acrylonitrile, and,
optionally, polycarbonate, and
forming the composition into an article.
16. The method of claim 15 , wherein the composition comprises 0.1% to 50% SAN and up to 20 wt % polycarbonate.
17. The method of claim 15 , wherein the composition comprises 0.1 wt % to 20 wt % SAN.
18. A composition consisting essentially of:
a transparent polysiloxane-polycarbonate copolymer comprising 2 wt % to 10 wt % siloxane; and
styrene-acrylonitrile copolymer (SAN);
and, optionally, polycarbonate;
wherein the SAN comprises not more than 25 wt % acrylonitrile, and the composition is transparent, having a haze of not more than 45% and a light transmission of at least 55%, per ASTM-D1003-61.