BRANCHED, HIGH HEAT POLYCARBONATES, METHODS OF MANUFACTURE, AND ARTICLES PREPARED THEREFROM
A branched polycarbonate comprising: high heat aromatic carbonate units derived from a high heat aromatic dihydroxy monomer units; optionally, low heat carbonate units derived from low heat monomer units; and 0.05-1.5 mole percent, preferably 0.05-1.0 mole percent, of a branching agent based on the total number of moles in the branched polycarbonate; wherein the branched polycarbonate has a tensile stress at break of 10-70 megaPascals measured according to ISO 527, and a glass transition temperature of 170-260° C. measured by differential scanning calorimetry according to ASTM D3418 with a 20° C./min heating rate.
1 . A branched polycarbonate comprising:
high heat aromatic carbonate units derived from a high heat aromatic dihydroxy monomer units;
optionally, low heat carbonate units derived from low heat monomer units; and
0.05-1.5 mole percent, preferably 0.05-1.0 mole percent, of a branching agent based on the total number of moles in the branched polycarbonate;
wherein the branched polycarbonate has
a tensile stress at break of 10-70 megaPascals measured according to ISO 527, and
a glass transition temperature of 170-260° C. measured by differential scanning calorimetry according to ASTM D3418 with a 20° C./min heating rate.
2 . The branched polycarbonate of claim 1 , wherein
the high heat aromatic carbonate units are derived from 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine, 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, or a combination thereof; and
the low heat carbonate units are present, and preferably wherein the low heat carbonate units are derived from bisphenol A.
3 . The branched polycarbonate of claim 1 , wherein the polycarbonate comprises
20-80 mole percent, of the high heat aromatic carbonate units; and
20-80 mole percent, of the low heat carbonate units,
each based on the total number of carbonate units in the branched polycarbonate.
4 . The branched polycarbonate of claim 1 , wherein the polycarbonate comprises
20-60 mole percent, preferably 30-50 mole percent, of high heat aromatic carbonate units derived from 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine, and
40-80 mole percent, preferably 50-70 mole percent, of low heat carbonate units derived from bisphenol A, each based on the total number of carbonate units in the branched polycarbonate.
5 . The branched polycarbonate of claim 1 , wherein the polycarbonate comprises
30-80 mole percent, preferably 50-80 mole percent, of high heat aromatic carbonate units derived from 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane; and
20-70 mole percent, preferably 20-50 mole percent, of low heat carbonate units derived from bisphenol A, each based on the total number of carbonate units in the branched polycarbonate.
6 . The branched polycarbonate of claim 1 , wherein the branching agent is the branching agent is trimellitic acid, trimellitic anhydride, trimellitic trichloride, tris-p-hydroxy phenyl ethane, isatin-bis-phenol, 1,3,5-tris((p-hydroxyphenyl)isopropyl)benzene, (4(4(1,1-bis(p-hydroxyphenyl)-ethyl)alpha, alpha-dimethyl benzyl)phenol), 4-chloroformyl phthalic anhydride, trimesic acid, benzophenone tetracarboxylic acid, or a combination thereof, preferably wherein the branching agent is tris-p-hydroxy phenyl ethane.
7 . A method of preparing the branched polycarbonate of claim 1 , the method comprising polymerizing
high heat aromatic dihydroxy monomer units, preferably 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine, 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, or a combination thereof;
optionally, low heat monomer units, preferably bisphenol A; and
0.05-1.5 mole percent of a branching agent, preferably 0.05-1.0 mole percent, based on the total number of moles in the branched polycarbonates.
8 . The method of claim 7 , wherein the polymerization is interfacial polymerization.
9 . A thermoplastic composition comprising
the branched polycarbonate of claim 1 ,
a linear polycarbonate,
optionally, an organosulfonic stabilizer, and
an additive, where the additive comprises an impact modifier, a filler, an ionizing radiation stabilizer, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet light absorber, a plasticizer, a lubricant, a mold release agent, an antistatic agent, a pigment, a dye, a flame retardant, an anti-drip agent, a phosphite stabilizer, or a combination thereof
preferably wherein the additive comprises a mold release agent, a heat stabilizer, a light stabilizer, an antioxidant, or a combination thereof.
10 . The thermoplastic composition of claim 9 , wherein the linear polycarbonate comprises a bisphenol A polycarbonate, preferably a bisphenol A homopolycarbonate.
11 . The thermoplastic composition of claim 9 , wherein the organosulfonic stabilizer is present.
12 . An article comprising the thermoplastic composition of claim 9 , preferably a molded article, a thermoformed article, an extruded film, an extruded sheet, a foamed article, a layer of a multi-layer article, a substrate for a coated article, or a substrate for a metallized article.
13 . The article of claim 12 , wherein the article is a lens.
14 . A method of manufacture the article of claim 12 comprising molding, extruding, foaming, or casting the thermoplastic composition to form the article, preferably injection molding the thermoplastic composition.