Low gloss polycarbonate compositions
View Patent ↗A thermoplastic composition comprising in combination a polycarbonate, an impact modifier composition comprising ABS or BABS, a second impact modifier different from BABS or ABS, an aromatic vinyl copolymer, and a gel-type low gloss additive, wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 11.3 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 30 KJ/m 2 when measured according to ISO 180/1A is disclosed. The composition has low gloss and a significantly improved balance of properties.
1. A thermoplastic composition comprising:
a polycarbonate,
an impact modifier composition comprising ABS or BABS,
a second impact modifier different from BABS or ABS,
an aromatic vinyl copolymer, and
a gel-type low gloss additive,
wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 11.3 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 30 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 10.0 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 40 KJ/m 2 when measured according to ISO 180/1A.
4. The thermoplastic composition of claim 1 , comprising 3.5 to 12 wt. % of the aromatic vinyl copolymer, and 1.5 to 5 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 15 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 , further comprising a polycarbonate-polysiloxane copolymer.
7. An article comprising the thermoplastic composition of claim 1 .
8. The article of claim 7 , wherein the article has a 60° gloss of less than or equal to 10.0 GU when measured according to ASTM D2457.
9. A thermoplastic composition comprising:
50 to 78 wt. % of a polycarbonate,
10 to 20 wt. % of a of an impact modifier composition comprising ABS or BABS,
2 to 15 wt. % of a second impact modifier different from BABS or ABS,
3.5 to 12 wt. % of an aromatic vinyl copolymer, and
1.5 to 5 wt. % a gel-type low gloss additive, wherein the total amount of the aromatic vinyl copolymer and gel-type low gloss additive is no more than 15 wt. %,
wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 11.3 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 30 KJ/m 2 when measured according to ISO 180/1A.
10. The thermoplastic composition of claim 9 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 10.0 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457.
11. The thermoplastic composition of claim 9 , wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 40 KJ/m 2 when measured according to ISO 180/1A.
12. The thermoplastic composition of claim 9 , wherein the second impact modifier different from BABS or ABS is MBS.
13. The thermoplastic composition of claim 9 , further comprising a polycarbonate-polysiloxane copolymer.
14. An article comprising the thermoplastic composition of claim 9 .
15. A thermoplastic composition comprising:
50 to 78 wt. % of a polycarbonate,
10 to 20 wt. % of ABS or BABS,
2 to 15 wt. % of MBS,
3.5 to 12 wt. % of SAN, and
1.5 to 5 wt. % 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 15 wt. %,
wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 11.3 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 30 KJ/m 2 when measured according to ISO 180/1A.
16. The thermoplastic composition of claim 15 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 10.0 GU on 3 millimeter chips having a textured surface when measured according to ASTM D2457.
17. The thermoplastic composition of claim 15 , wherein a molded sample of the thermoplastic composition has a low temperature notched Izod impact at −40° C. of at least 40 KJ/m 2 when measured according to ISO 180/1A.
18. The thermoplastic composition of claim 15 , wherein the second impact modifier different from BABS or ABS is MBS.
19. An article comprising the thermoplastic composition of claim 15 .
20. The thermoplastic composition of claim 15 , wherein the 60° gloss of the thermoplastic composition is measured to be less than or equal to 10.0 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 40 KJ/m 2 when measured according to ISO 180/1A.
21. The thermoplastic composition of claim 15 , further comprising a polycarbonate-polysiloxane copolymer.