US4555540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of flame retardant polycarbonate-polyester compositions
Assignee: General Electric Co
•
Filing: 1984-12-28
•
Granted: 1985-11-26
•
Expires: 2004-12-28
Abstract
Abstract Blends of an aromatic polycarbonate a polyester, a halogenated flame retardant agent and a metal oxide synergist for the flame retardant are made more stable against transesterification reactions during high temperature processing by the inclusion of minor amounts of selected phosphorus-containing compounds, such as phosphorous acid or acid salt.
Inventors
- 👤 Roger W. Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:58
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K13/00; C08K13/02; C08K5/00; C08K5/49; C08K5/51; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
165 words
A thermoplastic composition, comprising (a) an aromatic polycarbonate, an aromatic poly(ester-carbonate), an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, in combination with (b) a polyester resin comprising units of an aliphatic diol, an aliphatic ether diol, a cycloaliphatic diol, or a mixture of such diols and an aromatic or cycloaliphatic diacid; (c) a flame retardant amount of a halogen-containing flame retardant agent; (d) a metal oxide synergist for (c) in an amount which enhances the flame retardancy of the composition; and (e) a phosphorus-containing compound of the formula ##STR11## where Y is hydrogen or phenyl, or of the formula ##STR12## where R f is F(CF 2 CF 2 ) t , n and m are independently 1 or 2, and t is an integer from 3 to 8, said component (e) being present in an amount which substantially deactivates the transesterification causing properties of (d) and prevents said transesterification from occuring when the composition is processed at elevated temperatures.
Claim 2
Dependent Claim
165 words
A thermoplastic composition, comprising (a) an aromatic polycarbonate, an aromatic poly(ester-carbonate), an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, in combination with (b) a polyester resin comprising units of an aliphatic diol, an aliphatic ether diol, a cycloaliphatic diol, or a mixture of such diols and an aromatic or cycloaliphatic diacid; (c) a flame retardant amount of a halogen-containing flame retardant agent; (d) a metal oxide synergist for (c) in an amount which enhances the flame retardancy of the composition; and (e) a phosphorus-containing compound of the formula ##STR11## where Y is hydrogen or phenyl, or of the formula ##STR12## where R f is F(CF 2 CF 2 ) t , n and m are independently 1 or 2, and t is an integer from 3 to 8, said component (e) being present in an amount which substantially deactivates the transesterification causing properties of (d) and prevents said transesterification from occuring when the composition is processed at elevated temperatures.
Claim 3
Dependent Claim
14 words
A composition according to claim 1, in which component (a) comprises a poly(alkylene terephthalate)resin.
Claim 4
Dependent Claim
24 words
A composition according to claim 2, in which (a) comprises poly(bisphenol-A carbonate) and (b) comprises poly(1,4-butylene terephthalate), poly(ethylene terephthalate) or a mixture of both.
Claim 5
Dependent Claim
19 words
A composition according to claim 1, in which component (a) comprises a poly(ester-carbonate) and component (b) comprises a copolyester.
Claim 6
Dependent Claim
21 words
A composition according to claim 4, in which the copolyester is derived from isophthalic acid, terephthalic acid and an aliphatic diol.
Claim 7
Dependent Claim
20 words
A composition according to claim 1, in which (a) comprises an aromatic dihydric phenol sulfone and (b) comprises a copolyester.
Claim 8
Dependent Claim
31 words
A composition according to claim 6, in which (a) is a copolymer of sulfone and bisphenol-A with phosgene and (b) is derived from isophthalic acid, terephthalic acid and an aliphatic diol.
Claim 9
Dependent Claim
32 words
A composition according to claim 1, in which the aromatic polycarbonate of (a) has recurring structural units of the formula ##STR13## wherein A is a divalent aromatic radical of a dihydric phenol.
Claim 10
Dependent Claim
51 words
A composition according to claim 1, in which the poly(ester-carbonate) of (a) has recurring carbonate groups, recurring carboxylate groups and aromatic carboxyclic groups in the linear polymer chain, with at least some of the carboxylate groups and carbonate groups being bonded directly to ring carbon atoms of the aromatic carbocyclic groups.
Claim 11
Dependent Claim
29 words
A composition according to claim 1, in which the polyester of (b) has recurring units of the formula ##STR14## wherein n is an integer of from 2 to 4.
Claim 12
Dependent Claim
41 words
A composition according to claim 1, in which (b) has recurring units of the formula ##STR15## wherein R is aryl or cycloaliphatic having from 6 to 20 carbon atoms and which is the decarboxylated residue derived from an aromatic dicarboxylic acid.
Claim 13
Dependent Claim
16 words
A composition according to claim 1, in which (b) has repeating units of the formula ##STR16##
Claim 14
Dependent Claim
59 words
A composition according to claim 1, in which (b) is a copolyester having repeating units of the formulae ##STR17## wherein R is aryl or cycloaliphatic having from 6 to 20 carbon atoms, the x units comprise from about 10 to about 90 percent by weight, and the y units comprise from about 90 to about 10 percent by weight.
Claim 15
Dependent Claim
22 words
A composition according to claim 13, in which (b) is derived from the reaction of 1,4-cyclohexanedimethanol and ethylene glycol with terephthalic acid.
Claim 16
Dependent Claim
13 words
A composition according to claim 1, in which component (d) is antimony oxide.
Claim 17
Dependent Claim
13 words
A composition according to claim 1, in which component (e) is orthophosphorous acid.
Claim 18
Dependent Claim
86 words
A composition according to claim 1, which comprises from about 1 to about 99 parts by weight of (a), from about 99 to about 1 parts by weight of (b), from about 5 to about 30 parts by weight of (c), per 100 parts by weight of (a) and (b) together, from about 10 to about 30 parts by weight of (d), per 100 parts of (c), and from about 0.005 to about 5 parts by weight of (e), per 100 parts by weight of (d).
Claim 19
Independent Claim
180 words
A method for imparting color stability to a thermoplastic molding composition comprising (a) an aromatic polycarbonate, an aromatic poly(ester-carbonate), an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, in combination with (b) a polyester resin comprising units of an aliphatic diol, an aliphatic ether diol, a cycloaliphatic diol, or a mixture of such diols and an aromatic or cycloaliphatic diacid, said method comprising including in the composition (c) a flame retardant amount of a halogen-containing flame retardant agent; (d) a metal oxide synergist for (c) in an amount which enhances the flame retardancy of the composition; and (e) a phosphorus-containing compound of the formula ##STR18## where Y is hydrogen or phenyl, or of the formula ##STR19## where R f is F(CF 2 CF 2 ) t , n and m are independently 1 or 2, and t is an integer from 3 to 8, said component (e) being present in an amount which substantially deactivates the transesterification causing properties of (d) and prevents said transesterification from occuring when the composition is processed at elevated temperatures.
Claim 20
Independent Claim
180 words
A method for imparting color stability to a thermoplastic molding composition comprising (a) an aromatic polycarbonate, an aromatic poly(ester-carbonate), an aromatic dihydric phenol sulfone carbonate, or a mixture of any of the foregoing, in combination with (b) a polyester resin comprising units of an aliphatic diol, an aliphatic ether diol, a cycloaliphatic diol, or a mixture of such diols and an aromatic or cycloaliphatic diacid, said method comprising including in the composition (c) a flame retardant amount of a halogen-containing flame retardant agent; (d) a metal oxide synergist for (c) in an amount which enhances the flame retardancy of the composition; and (e) a phosphorus-containing compound of the formula ##STR18## where Y is hydrogen or phenyl, or of the formula ##STR19## where R f is F(CF 2 CF 2 ) t , n and m are independently 1 or 2, and t is an integer from 3 to 8, said component (e) being present in an amount which substantially deactivates the transesterification causing properties of (d) and prevents said transesterification from occuring when the composition is processed at elevated temperatures.
Claim 21
Dependent Claim
18 words
A method according to claim 18, in which component (e), is added to the composition by dry blending.
Claim 22
Dependent Claim
21 words
A method according to claim 18, in which component (a) comprises an aromatic polycarbonate and component (b) comprises a poly(alkylene terephthalate).
Claim 23
Dependent Claim
24 words
A composition according to claim 20, in which (a) comprises poly(bisphenol-A carbonate) and (b) comprises poly(1,4-butylene terephthalate), poly(ethylene terephthalate) or a mixture of both.
Claim 24
Dependent Claim
19 words
A method according to claim 18, in which component (a) comprises a poly(ester-carbonate) and component (b) comprises a copolyester.
Claim 25
Dependent Claim
20 words
A method according to claim 22, in which (b) is derived from isophthalic acid, terephthalic acid and an aliphatic diol.
Claim 26
Dependent Claim
22 words
A method according to claim 18, in which component (a) comprises an aromatic dihydric phenol sulfone and component (b) comprises a copolyester.
Claim 27
Dependent Claim
31 words
A method according to claim 24, in which (a) is a copolymer of sulfone and bisphenol-A with phosgene and (b) is derived from isophthalic acid, terephthalic acid and an aliphatic diol.
Claim 28
Dependent Claim
32 words
A method according to claim 18, in which the aromatic polycarbonate of (a) has recurring structural units of the formula ##STR20## wherein A is a divalent aromatic radical of a dihydric phenol.
Claim 29
Dependent Claim
51 words
A method according to claim 18, in which the poly(ester-carbonate) of (a) has recurring carbonate groups, recurring carboxylate groups and aromatic carbocyclic groups in the linear polymer chain, with at least some of the carboxylate groups and carbonate groups being bonded directly to ring carbon atoms of the aromatic carbocyclic groups.
Claim 30
Dependent Claim
29 words
A method according to claim 18, in which the polyester of (b) has recurring units of the formula ##STR21## wherein n is an integer of from 2 to 4.
Claim 31
Dependent Claim
41 words
A method according to claim 18, in which (b) has recurring units of the formula ##STR22## wherein R is aryl or cycloaliphatic having from 6 to 20 carbon atoms and which is the decarboxylated residue derived from an aromatic dicarboxylic acid.
Claim 32
Dependent Claim
16 words
A method according to claim 18, in which (b) has repeating units of the formula ##STR23##
Claim 33
Dependent Claim
59 words
A composition according to claim 18, in which (b) is a copolyester having repeating units of the formulae ##STR24## wherein R is aryl or cycloaliphatic having from 6 to 20 carbon atoms, the x units comprise from about 10 to about 90 percent by weight, and the y units comprise from about 90 to about 10 percent by weight.
Claim 34
Dependent Claim
22 words
A method according to claim 31, in which (b) is derived from the reaction of 1,4-cyclohexanedimethanol and ethylene glycol with terephthalic acid.
Claim 35
Dependent Claim
12 words
A method according to claim 18, in which (d) is antimony oxide.
Claim 36
Dependent Claim
12 words
A method according to claim 18, in which (e) is orthophosphorous acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |