Flame retardant thermoplastic polycarbonate compositions
View Patent ↗Disclosed is a thermoplastic composition comprising a polycarbonate terpolymer comprising structures derived from structures (I), (II) and (III), wherein (I) is a dihydroxy compound having the structure (A): wherein n is 0 to 4 and R f is independently a halogen atom, a C 1-10 hydrocarbon group, or a C 1-10 halogen substituted hydrocarbon group; (II) comprises a second dihydroxy compound derived from Formula (A) and different from (I) and wherein n and R f are as previously defined; and (III) a third dihydroxy compound not derived from Formula (A), wherein the sum of the mol percent of all of structures (I) and (II) is greater than 45% relative to the sum of the molar amounts of all of structures (I), (II) and (III) in the polycarbonate terpolymer and wherein said polycarbonate terpolymer is amorphous; an impact modifier; an ungrafted rigid copolymer; and a flame retardant. The thermoplastic composition has improved chemical resistance and flame retardance.
1. A thermoplastic composition comprising:
a polycarbonate terpolymer comprising structures derived from at least one of each of structures (I), (II) and (III), wherein (I) is a dihydroxy compound having the structure (A):
wherein n is 0 to 4 and R f is independently a halogen atom, a C 1-10 hydrocarbon group, or a C 1-10 halogen substituted hydrocarbon group;
(II) comprises a second dihydroxy compound derived from Formula (A) and different from (I) and wherein n and R f are as previously defined; and
(III) a third dihydroxy compound, wherein the third dihydroxy compound is bisphenol A, wherein the sum of the mol percent of all of structures (I) and (II) is greater than 45% relative to the sum of the molar amounts of all of structures (I), (II) and (III) in the polycarbonate terpolymer, the ratio of dihydroxy compounds (I):(II):(III) is about 1:1:1, and wherein the polycarbonate terpolymer is amorphous;
an impact modifier;
an ungrafted rigid copolymer; and
a phosphorous containing flame retardant.
2. The thermoplastic composition of claim 1 , comprising:
from about 10 to about 94 wt. % of the polycarbonate terpolymer;
from about 5 to about 45 wt. % of the impact modifier;
from about 0.5 to about 45 wt. % of the ungrafted rigid copolymer, and
from about 0.5 to about 20 wt. % of the flame retardant;
wherein the sum of the polycarbonate terpolymer, the impact modifier, the ungrafted rigid copolymer and the flame retardant equals 100 wt. %.
3. The thermoplastic composition of claim 1 , wherein the impact modifier is ABS, MBS, ASA, polycarbonate-polysiloxane copolymer, or a combination of two or more of the foregoing impact modifiers.
4. The thermoplastic composition of claim 1 , wherein the impact modifier is a combination of ABS and polycarbonate-polysiloxane copolymer.
5. The thermoplastic composition of claim 1 , wherein the ungrafted rigid copolymer comprises acrylonitrile monomer or (meth)acrylate monomer.
6. The thermoplastic composition of claim 1 , wherein in the first dihydroxy (I) of Formula (A) n is 0.
7. The thermoplastic composition of claim 1 , wherein in the second dihydroxy (II) of Formula (A) n is 1 and R f is C 1 .
8. An article formed from the thermoplastic composition of claim 1 .
9. A thermoplastic composition comprising
a polycarbonate terpolymer comprising structures derived from structures (I), (II) and (III), wherein (I) is a dihydroxy compound having the structure (A):
wherein n is 0;
(II) comprises a second dihydroxy compound derived from Formula (A), wherein n is 1 and R f is a C 1 hydrocarbon group; and
(III) a third dihydroxy compound not derived from Formula (A), wherein the sum of the mol percent of all of structures (I) and (II) is greater than 45% relative to the sum of the molar amounts of all of structures (I), (II) and (III) in the polycarbonate terpolymer, the ratio of dihydroxy compounds (I):(II):(III) is about 1:1:1, and wherein the polycarbonate terpolymer is amorphous;
an impact modifier;
an ungrafted rigid copolymer; and
a phosphorous containing flame retardant.
10. The thermoplastic composition of claim 9 , comprising:
from about 10 to about 94 wt. % of the polycarbonate terpolymer;
from about 5 to about 45 wt. % of the impact modifier; and
from about 0.5 to about 45 wt. % of the ungrafted rigid copolymer,
from about 0.5 to about 20 wt. % of the flame retardant;
wherein the sum of the polycarbonate terpolymer, the impact modifier, the ungrafted rigid copolymer and the flame retardant equals 100 wt. %.
11. The thermoplastic composition of claim 9 , wherein the ungrafted rigid copolymer comprises acrylonitrile monomer or (meth)acrylate monomer.
12. The thermoplastic composition of claim 9 , wherein the impact modifier is ABS, MBS, ASA, polycarbonate-polysiloxane copolymer, or a combination of two or more of the foregoing impact modifiers.
13. The thermoplastic composition of claim 9 , wherein the impact modifier is a combination of ABS and polycarbonate-polysiloxane copolymer.
14. An article formed from the thermoplastic composition of claim 9 .
15. The thermoplastic composition of claim 9 , wherein third dihydroxy compound is bisphenol A.