Polycarbonate compositions
View Patent ↗Polycarbonate compositions are disclosed. The compositions comprise a polycarbonate polymer (A) having repeating units derived from at least three different monomers, one monomer being 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP); and the other two monomers having the formula: wherein each R k is independently a halogen atom, a C 1-10 hydrocarbon group, or a C 1-10 halogen substituted hydrocarbon group, and n is 0 to 4; and an impact modifier (B). The resulting composition has improved heat resistance and chemical resistance, particularly to Fuel C.
1. A thermoplastic composition comprising:
a polycarbonate terpolymer (A) having repeating units derived from three different monomers (I), (II), and (III), wherein
monomer (I) is 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP); and
monomers (II) and (III) are each a dihydroxy compound of formula (I):
wherein each R k is independently a halogen atom, a C 1 - 10 hydrocarbon group, or a C 1-10 halogen substituted hydrocarbon group, and n is 0 to 4, monomer (II) being different from monomer (III); and
an impact modifier (B) selected from the group consisting of acrylonitrile-butadiene-styrene (ABS) and methacrylonitrile-butadiene-styrene (MBS) resins, and mixtures thereof;
wherein the thermoplastic composition has a percent retention of tensile elongation of at least 80 percent upon exposure to Fuel C, 0.5% strain, for 2 days according to ISO 4599;
wherein the polycarbonate polymer (A) has a glass transition temperature of 165° C. or greater; and
wherein the ratio of monomer (II) to monomer (III) is from about 3:4 to about 4:3 and the polycarbonate terpolymer contains about 80 mole percent of monomers (II) and (III) combined.
2. The thermoplastic composition of claim 1 , wherein monomer (II) is methylhydroquinone and monomer (III) is hydroquinone.
3. The thermoplastic composition of claim 1 , wherein monomer (II) is methylhydroquinone; and the polycarbonate polymer comprises at least 17 mole percent of monomer (I) and at least 25 mole percent of monomer (II).
4. The thermoplastic composition of claim 1 , wherein the polycarbonate polymer (A) comprises from about 60 to about 80 weight percent of the composition; and the impact modifier (B) comprises from about 2 to about 40 weight percent of the composition.
5. The thermoplastic composition of claim 1 , further comprising a talc filler (C) that comprises from about 5 to about 20 weight percent of the composition.
6. The thermoplastic composition of claim 1 , wherein the thermoplastic composition does not comprise a talc filler and has a melt volume rate (MVR) of from about 4 to about 10 cc/10 min, when measured according to ISO 1133 at 260° C., 5 kg.
7. The thermoplastic composition of claim 1 , wherein the thermoplastic composition has a melt volume rate (MVR) of 15 cc/10 min or less, when measured according to ISO 1133 at 260° C., 5 kg.
8. The thermoplastic composition of claim 1 , wherein the thermoplastic composition has a heat deflection temperature of at least 130° C., when measured according to ISO 75.
9. The thermoplastic composition of claim 1 , wherein the thermoplastic composition has a Vicat B50 softening temperature of at least 150° C., when measured according to ISO 306.
10. The thermoplastic composition of claim 1 , further comprising a styrene-acrylonitrile polymer (D) in an amount of from about 5 to about 10 weight percent of the thermoplastic composition.
11. An article formed from the thermoplastic composition of claim 1 .
12. A thermoplastic composition comprising:
a polycarbonate terpolymer (A) having repeating units derived from three different monomers, the three monomers being 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP), hydroquinone and methylhydroquinone; and
an impact modifier (B);
wherein the thermoplastic composition has a heat deflection temperature of at least 130° C., when measured according to ISO 75;
wherein the polycarbonate polymer (A) has a glass transition temperature of 165° C. or greater; and
wherein the ratio of methylhydroquinone to hydroquinone is from about 3:4 to about 4:3 and the polycarbonate terpolymer contains about 80 mole percent of hydroquinone and methylhydroquinone combined.
13. A polycarbonate terpolymer having repeating units derived from three different monomers (I), (II), and (III), wherein
monomer (I) is 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP); and
monomers (II) and (III) are each a dihydroxy compound of formula (I):
wherein each R k is independently a halogen atom, a C 1-10 hydrocarbon group, or a C 1-10 halogen substituted hydrocarbon group, and n is 0 to 4, monomer (II) being different from monomer (III);
wherein the polymer has a percent retention of tensile elongation of at least 80 percent upon exposure to Fuel C, 0.5% strain, for 2 days according to ISO 4599;
wherein the polycarbonate polymer (A) has a glass transition temperature of 165° C. or greater; and
wherein the ratio of monomer (II) to monomer (III) is from about 3:4 to about 4:3 and the polycarbonate terpolymer contains about 80 mole percent of monomers (II) and (III) combined.
14. The polycarbonate polymer of claim 13 , wherein:
monomer (II) is methylhydroquinone;
monomer (III) is hydroquinone;
monomer (I) comprises at least 17 mole percent of the polycarbonate polymer; and
monomer (II) comprises at least 25 mole percent of the polycarbonate polymer.