Thermoplastic polycarbonate compositions
View Patent ↗A thermoplastic composition comprising from 30 to 93 wt. % of an aromatic polycarbonate, from 0.5 to 20 wt. % of an impact modifier, from 0 to 25 wt. % of an aromatic vinyl copolymer, from 6 to 35 wt. % of a mineral filler, and from 0.01 to 4 wt. % of an organo-hydrosiloxane or a copolymer comprising an organo-hydrosiloxane and a polysiloxane, based on the total weight of the composition, has been found to exhibit improved mechanical properties and other characteristics and less degradation than filled thermoplastic compositions without the organo-hydrosiloxane. The composition optionally comprises an acid or acid salt. An article may be formed by molding, extruding, shaping or forming such a composition to form the article.
1. A thermoplastic resin composition comprising:
from 30 to 93 wt. % of an aromatic polycarbonate;
from 0.5 to 20 wt. % of an impact modifier;
from 0 to 25 wt. % of an aromatic vinyl copolymer;
from 6 to 35 wt. % of talc; wherein the talc has a particle size distribution D50 of 3 microns or less; and
from 0.01 to 4 wt. % of poly methyl hydrogen siloxane or a copolymer comprising poly methyl hydrogen siloxane and a polysiloxane, based on the total weight of the composition.
2. The thermoplastic resin composition of claim 1 , wherein the composition comprises from 50 to 87 wt. % of the aromatic polycarbonate, from 1 to 12 wt. % of the impact modifier, from 10 to 25 wt. % of the talc, and optionally from 2 to 15 wt. % of the aromatic vinyl copolymer.
3. The thermoplastic composition of claim 1 , further comprising an acid or acid salt.
4. The thermoplastic composition of claim 3 , wherein the acid or acid salt comprises phosphorous.
5. A thermoplastic composition consisting of:
from 50 to 87 wt. % of an aromatic polycarbonate;
from 1 to 20 wt. % of an impact modifier;
from 2 to 25 wt. % of an aromatic vinyl copolymer;
from 10 to 25 wt. % of talc;
from 0.01 to 5 wt. % of an acid or a salt thereof; wherein the acid is H 3 PO 4 , H 3 PO 3 , H 3 PO 2 , or a combination comprising at least one of the forgoing acids;
from 0.01 to 2 wt. % of poly methyl hydrogen siloxane or a copolymer comprising poly methyl hydrogen siloxane and a polysiloxane; and
from 0.01 to 7 wt. % of additives, wherein the additives comprise a filler, an antidrip agent, a heat stabilizer, a light stabilizer, an antioxidant, a plasticizer, an antistatic agent, a mold release agent, a UV absorber, a lubricant, a pigment, a dye, a colorant, or combinations of two or more of the foregoing, based on the total weight of the composition.
6. The thermoplastic composition of claim 5 , wherein the acid or the salt thereof is present in a weight ratio of acid to filler of at least 0.0035:1.
7. The thermoplastic composition of claim 5 , wherein the talc has a particle size distribution D50 of 3 microns or less.
8. An article comprising the thermoplastic composition of claim 1 .
9. An article comprising the thermoplastic composition of claim 5 .
10. The thermoplastic composition of claim 1 , wherein the talc has a particle size distribution D50 of 1.1 microns or less.
11. A thermoplastic resin composition comprising:
from 30 to 93 wt. % of an aromatic polycarbonate;
from 0.5 to 20 wt. % of an impact modifier;
from 0 to 25 wt. % of an aromatic vinyl copolymer;
from 6 to 35 wt. % of talc;
from 0.01 to 5 wt. % of an acid or a salt thereof; wherein the acid is H 3 PO 4 , H 3 PO 3 , H 3 PO 2 , or a combination comprising at least one of the forgoing acids; and
from 0.01 to 4 wt. % of an organo-hydrosiloxane; where the organo-hydrosiloxane consists essentially of a poly methyl hydrogen siloxane or a copolymer comprising poly methyl hydrogen siloxane and a polysiloxane, based on the total weight of the composition.
12. The thermoplastic composition of claim 11 , wherein the weight ratio of the acid or the salt thereof to talc is at least 0.0035:1.
13. The thermoplastic composition of claim 11 , wherein the talc has a particle size distribution D50 of 3 microns or less.
14. An article comprising the thermoplastic composition of claim 11 .
15. The thermoplastic composition of claim 1 , further comprising from 0.01 to 5 wt. % of an acid or a salt thereof; wherein the acid is H 3 PO 4 , H 3 PO 3 , H 3 PO 2 , or a combination comprising at least one of the forgoing acids.
16. The thermoplastic composition of claim 1 , further comprising a flame retardant comprising phosphorous.
17. The thermoplastic composition of claim 5 , further comprising a flame retardant comprising phosphorous.
18. The thermoplastic composition of claim 11 , wherein the organo-hydrosiloxane is a poly methyl hydrogen siloxane or a copolymer comprising poly methyl hydrogen siloxane and polydimethyl siloxane.
19. The thermoplastic composition of claim 11 , further comprising a flame retardant comprising phosphorous.
20. A thermoplastic composition consisting of:
from 50 to 87 wt. % of an aromatic polycarbonate comprising a linear homopolymer derived from bisphenol A;
from 1 to 20 wt. % of an impact modifier;
from 2 to 25 wt. % of an aromatic vinyl copolymer comprising poly(styrene acrylonitrile);
from 10 to 25 wt. % of talc wherein the talc has a particle size distribution D50 of 3 microns or less;
from 0.01 to 5 wt. % of an acid or a salt thereof, wherein the acid is H 3 PO 4 , H 3 PO 3 , H 3 PO 2 , or a combination comprising at least one of the forgoing acids;
from 0.01 to 2 wt. % of poly methyl hydrogen siloxane or a copolymer comprising poly methyl hydrogen siloxane and a polysiloxane; and
from 0.01 to 7 wt. % of additives, wherein the additives comprise a filler, an antidrip agent, a heat stabilizer, a light stabilizer, an antioxidant, a plasticizer, an antistatic agent, a mold release agent, a UV absorber, a lubricant, a pigment, a dye, a colorant, a flame retardant, or combinations of two or more of the foregoing, based on the total weight of the composition.