US5250655A
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Melt preparation of polycarbonate with metal compound and p compound catalysts
Assignee: Mitsubishi Chemical Corp
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Filing: 1992-08-24
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Granted: 1993-10-05
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Expires: 2012-08-24
Abstract
Abstract An aromatic polycarbonate of improved color value and high molecular weight is obtained by the addition of phosphorous acid and/or a phosphorous ester to the melt polycondensation reaction medium containing aromatic diol, carbonate diester and a metal-containing compound as ester interchange catalyst during the polycondensation reaction
Inventors
- 👤 Masuzo Yokoyama
- 👤 Junji Takano
- 👤 Kazuhide Takakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:02
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/30; C08G64/307
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
50 words
A method for producing an aromatic polycarbonate which comprises melt polycondensing an aromatic diol and a carbonate diester in the presence of a metal-containing compound as ester interchange catalyst and in the presence of a compound selected from the group consisting of phosphorous acid, a phosphorous ester and mixtures thereof.
Claim 2
Independent Claim
50 words
A method for producing an aromatic polycarbonate which comprises melt polycondensing an aromatic diol and a carbonate diester in the presence of a metal-containing compound as ester interchange catalyst and in the presence of a compound selected from the group consisting of phosphorous acid, a phosphorous ester and mixtures thereof.
Claim 3
Dependent Claim
52 words
The method according to claim 1 wherein the ester interchange catalyst is selected from the group consisting of acetate, carbonate, borate, nitrate, oxide, hydroxide, hydride and alcoholate of a metal selected from the group consisting of alkali metal, an alkaline earth metal, zinc, cadmium, tin, antimony, manganese, cobalt, nickel, titanium and zirconium.
Claim 4
Dependent Claim
37 words
The method according to claim 2 wherein the ester interchange catalyst is selected from the group consisting of dibutyltin oxide, dibutyltin laurate, tin oxide, tin acetate, tin carbonate, tin nitrate, lithium hydride, lithium borohydride and calcium acetate.
Claim 5
Dependent Claim
65 words
The method according to claim 1 wherein the phosphorous ester compound is represented by the general formula: ##STR5## wherein R 1 , R 2 and R 3 independently represent alkyl, allyl, cycloalkyl, aralkyl or alkylallyl of up to about 20 carbon atoms and Z represents a single bond or Z is an oxygen atom with at least one of the Zs representing an oxygen atom.
Claim 6
Dependent Claim
46 words
The method according to claim 4 wherein the phosphorous ester is selected from the group consisting of triethyl phosphite, tributyl phosphite, tris(2-ethylhexyl) phosphite, tridecyl phosphite, tristearyl phosphite, triphenyl phosphite, tricresyl phosphite, tris(nonylphenyl) phosphite, tris(2,4-di-t-butylphenyl) phosphite, decyldiphenyl phosphite, phenyl-di-2-ethylhexyl phosphite, phenyl-didecyl phosphite, tris(biphenyl) phosphite and tricyclohexyl phosphite.
Claim 7
Dependent Claim
80 words
The method according to claim 1 wherein the phosphorous ester is represented by the general formula: ##STR6## wherein R 4 , R 5 , R 6 and R 7 independently represent alkyl, allyl, cycloalkyl, aralkyl or alkylallyl of up to about 20 carbon atoms, Z represents a single bond or an oxygen atom with at least one of the Zs representing an oxygen atom and Y represents alkyl, allyl, cycloalkyl, aralkyl or alkylallyl of up to about 30 carbon atoms.
Claim 8
Dependent Claim
27 words
The method according to claim 6 wherein the phosphorous ester is selected from the group consisting of tetraphenyl-4,4'-isopropylidene-diphenol diposphite, tetratridecyl-4,4'-isopropylidene-diphenol diphosphite, tetratridecyl-4,4'-butylidene bis(3-methyl-6-t-butylphenol) diphosphite and tetrakis(2,4-di-t-butylphenyl-4,4'-biphenylene phosphite.
Claim 9
Dependent Claim
69 words
The method according to claim 1 wherein the phosphorous ester is represented by the general formula: ##STR7## wherein R 8 represents alkyl, allyl, cycloalkyl, aralkyl or alkylallyl of up to about 30 carbon atoms, R 9 represents an alkyl of up to about 20 carbon atoms and Z represents a single bond or Z is an oxygen atom with at least one of the Zs representing an oxygen atom.
Claim 10
Dependent Claim
24 words
The method according to claim 8, wherein the phosphorous ester is selected from the group consisting of bis(stearyl)pentaerythritol diphosphite, bis(2,6-di-t-butylphenyl)pentaerythritol diphosphite and bis(nonylphenyl)pentaerythritol diphosphite.
Claim 11
Dependent Claim
28 words
The method according to claim 1 wherein the carbonate diester is present at a level of from about 1.01 to about 1.30 moles per mole of aromatic diol.
Claim 12
Dependent Claim
33 words
The method according to claim 1 wherein the phosphorous acid or phosphorous ester is present at a level of from about 10 -5 to about 10 -1 moles per mole of aromatic diol.
Claim 13
Dependent Claim
30 words
The method according to claim 1 wherein the ester interchange catalyst is present at a level of from about 10-5 to about 10 -1 moles per mole of aromatic diol.
Claim 14
Dependent Claim
32 words
The method according to claim 1 wherein the phosphorous acid or phosphorous ester is present at a level of from about 0.03 to about 50 moles per mole of ester interchange catalyst.
Claim 15
Dependent Claim
90 words
The method according to claim 1 wherein the aromatic diol is represented by the general formula: ##STR8## wherein A represents a single bond, a substituted or unsubstituted, linear, branched or cyclic hydrocarbon group of up to about 15 carbon atoms or a divalent group represented by --O--, --S--, --CO--, --SO-- or --SO 2 --, X and Y, each of which is identical or different, are hydrogen, halogen or a hydrocarbon group of up to about 6 carbon atoms and p and q independently represent an integer of 0 to 2.
Claim 16
Dependent Claim
24 words
The method according to claim 14 wherein the aromatic diol is selected from the group consisting of bisphenols, biphenyls, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ether and bis(4-hydroxyphenyl)ketone.
Claim 17
Dependent Claim
38 words
The method according to claim 15 wherein the bisphenol is selected from the group consisting of bis(4-hydroxydiphenyl)methane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3-t-butylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane and 4,4-bis(4-hydroxyphenyl)heptane, 1,1-bis-(4-hydroxyphenyl)cyclohexane and the biphenyl is selected from the group consisting of 4,4'-dihydroxybiphenyl and 3,3', 5,5'-tetramethyl-4,4'-biphenyl.
Claim 18
Dependent Claim
27 words
The method according to claim 1 wherein the carbonate diester is selected from the group consisting of dimethyl carbonate, diphenyl carbonate, ditolyl carbonate, bis(4-chlorophenyl)carbonate, and bis(2,4,5-trichlorophenyl) carbonate.
Claim 19
Dependent Claim
49 words
The method according to claim 1 wherein the aromatic polycarbonate has a number average molecular weight (Mn) of from about 10,000 to about 30,000, a weight average molecular weight (Mw) of from about 20,000 to about 70,000 and a value for Mw/Mn of from about 2 to about 4.
Claim 20
Dependent Claim
24 words
The method according to claim 1 wherein the aromatic polycarbonate has a color value (A 3 4 5) of not greater than about 0.1.
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