Low gloss polycarbonate compositions
View Patent ↗A thermoplastic composition comprising in combination a polycarbonate, a polycarbonate-polysiloxane copolymer, an impact modifier composition comprising ABS or BABS, a second impact modifier different from BABS or ABS, an aromatic vinyl copolymer, and optionally a gel-type low gloss additive, wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 14 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457, and wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 65 KJ/m 2 when measured according to ISO 180/1A is disclosed. The composition has low gloss, high low temperature impact, and a significantly improved balance of properties.
1. A thermoplastic composition comprising:
a polycarbonate,
a polycarbonate-polysiloxane copolymer,
an impact modifier composition comprising ABS or BABS,
a second impact modifier different from BABS or ABS,
an aromatic vinyl copolymer, and
optionally a gel-type low gloss additive,
wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 14 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457,
and wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 65 KJ/m 2 when measured according to ISO 180/1A.
2. The thermoplastic composition of claim 1 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 12.0 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457.
3. The thermoplastic composition of claim 1 , wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 70 KJ/m 2 when measured according to ISO 180/1A.
4. The thermoplastic composition of claim 1 , comprising 1 to 10 wt. % of the aromatic vinyl copolymer, and 0 to 1 wt. % of the gel-type low gloss additive, wherein the total amount of the aromatic vinyl copolymer and gel-type low gloss additive is no more than 10 wt. %.
5. The thermoplastic composition of claim 1 , wherein the second impact modifier different from BABS or ABS is MBS.
6. The thermoplastic composition of claim 1 , comprising 2 to 10 wt. % polycarbonate-polysiloxane copolymer.
7. An article comprising the thermoplastic composition of claim 1 .
8. A thermoplastic composition comprising:
50 to 87 wt. % of a polycarbonate,
2 to 10 wt. % of a polycarbonate-polysiloxane copolymer,
10 to 20 wt. % of an impact modifier composition comprising ABS or BABS,
2 to 10 wt. % of a second impact modifier different from BABS or ABS,
3 to 10 wt. % of an aromatic vinyl copolymer, and
0 to 1 wt. % of a gel-type low gloss additive, wherein the total amount of the aromatic vinyl copolymer and the gel-type low gloss additive is no more than 10 wt. %,
wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 14 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457,
and wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 65 KJ/m 2 when measured according to ISO 180/1A.
9. The thermoplastic composition of claim 8 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 12.0 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457.
10. The thermoplastic composition of claim 8 , wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 70 KJ/m 2 when measured according to ISO 180/1A.
11. The thermoplastic composition of claim 8 , wherein the second impact modifier different from BABS or ABS is MBS.
12. The thermoplastic composition of claim 8 , comprising 5 to 10 wt. % polycarbonate-polysiloxane copolymer.
13. An article comprising the thermoplastic composition of claim 8 .
14. A thermoplastic composition comprising:
50 to 87 wt. % of a polycarbonate,
2 to 10 wt. % of a polycarbonate-polysiloxane copolymer,
10 to 20 wt. % of an impact modifier composition comprising ABS or BABS,
2 to 10 wt. % of MBS,
3 to 10 wt. % of SAN, and
0 to 1 wt. % of a gel-type low gloss additive comprising SAN, wherein the total amount of the SAN and gel-type low gloss additive is no more than 10 wt. %,
wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 14 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457,
and wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 65 KJ/m 2 when measured according to ISO 180/1A.
15. The thermoplastic composition of claim 14 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 12.0 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457.
16. The thermoplastic composition of claim 14 , wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 70 KJ/m 2 when measured according to ISO 180/1A.
17. The thermoplastic composition of claim 14 , wherein the second impact modifier different from BABS or ABS is MBS.
18. The thermoplastic composition of claim 14 , comprising 5 to 10 wt. % polycarbonate-polysiloxane copolymer.
19. The thermoplastic composition of claim 14 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 12.0 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457 and wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 70 KJ/m 2 when measured according to ISO 180/1A.
20. An article comprising the thermoplastic composition of claim 14 .