US4085086A
Expired / Lapsed
US
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Process for preparing flame retardant thermoplastic polyesters
Assignee: DIC Corp
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Filing: 1975-08-26
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Granted: 1978-04-18
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Expires: 1995-08-26
Abstract
Abstract A process for preparing a flame retardant thermoplastic polyester which comprises reacting a low molecular weight polyester having terminal hydroxyl groups with a polyfunctional isocyanate, said low molecular weight polyester being one synthesized using as its acid component a compound selected from the group consisting of terephthalic acid and its lower alkyl esters of 1-4 carbon atoms and as its alcohol component 1,4-butanediol and a compound selected from the group consisting of an alkylene oxide adduct of 2 - 4 carbon atoms of tetrabromobisphenol A and an alkylene oxide adduct of 2 - 4 carbon atoms of tetrachlorobisphenol A.
Inventors
- 👤 Shioji Mizuno
- 👤 Ryoichi Ishikawa
- 👤 Mitsumasa Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/46; C08G18/4607; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; C08G63/685; C08G63/6854; C08G63/6856; C08G63/91; C08G63/914; C08G63/916
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A process for preparing a flame retardant thermoplastic polyester molding resin which comprises reacting in the presence of a reinforcing agent a low molecular weight polyester having terminal hydroxyl groups with a polyfunctional isocyanate, said low molecular weight polyester being one synthesized using as its acid component a compound selected from the group consisting of terephthalic acid and its lower alkyl esters of 1-4 carbon atoms and as its alcohol component 1,4-butanediol and a compound selected from the group consisting of an alkylene oxide adduct of 2-4 carbon atoms of tetrabromobisphenol A and an alkylene oxide adduct of 2-4 carbon atoms of tetrachlorobisphenol A.
Claim 2
Dependent Claim
104 words
A process for preparing a flame retardant thermoplastic polyester molding resin which comprises reacting in the presence of a reinforcing agent a low molecular weight polyester having terminal hydroxyl groups with a polyfunctional isocyanate, said low molecular weight polyester being one synthesized using as its acid component a compound selected from the group consisting of terephthalic acid and its lower alkyl esters of 1-4 carbon atoms and as its alcohol component 1,4-butanediol and a compound selected from the group consisting of an alkylene oxide adduct of 2-4 carbon atoms of tetrabromobisphenol A and an alkylene oxide adduct of 2-4 carbon atoms of tetrachlorobisphenol A.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the polyfunctional isocyanate is a diisocyanate having the general formula OCN -- R.sub.1 -- NCO wherein R 1 is a divalent hydrocarbon radical of 2 - 15 carbon atoms.
Claim 4
Dependent Claim
50 words
The process of claim 1 wherein said low molecular weight polyester and said polyfunctional isocyanate are mixed in such a proportion that the ratio of the number of isocyanate groups of the polyfunctional isocyanate to the number of hydroxyl groups of the low molecular weight polyester is 1:0.1 - 2.5.
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein said low molecular weight polyester is one that has been obtained by reacting an acid component and an alcohol component in a mole ratio of 1:1 - 2.5.
Claim 6
Dependent Claim
10 words
A molding resin obtained by the process of claim 1.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the reinforcing agent comprises glass fibers.
Claim 8
Dependent Claim
118 words
The process of claim 1 wherein said low molecular weight polyester is a random copolyester having the general formula ##STR14## wherein A and F are either HOOC- ##STR15## R is a member selected from the group consisting of ethylene, propylene, isopropylene and butylene; X is a member of the group consisting of Cl and Br, with the proviso that when X is Cl, m is a number from 3.62 to 52.2, n is a number from 0.510 to 51.0, and l is a number from 0.345 to 26.3, and when X is Br, m is a number from 5.86 to 53.8, n is a number from 4.82 to 53.7 and l is a number from 0.152 to 8.93.
Claim 9
Dependent Claim
74 words
The process of claim 7 wherein the low molecular weight polyester has an intrinsic viscosity as measured at 25° C using orthoclorophenol as solvent in the range of from 0.15 to 0.6, a hydroxyl value which is not less than 5 or more than 40 and an acid value which is not greater than 10 and is not greater than 1/3 of the hydroxyl value and a number average molecular weight of 2240 -14000.
Claim 10
Dependent Claim
170 words
A reinforced flame retardant thermoplastic polyester molding resin composition comprising A. a flame retardant thermoplastic polyester which is the reaction product of a low molecular weight modified polybutylene terephthalate with a polyfunctional isocyanate, said reaction product having a number average molecular weight of 18000-60000 and being a random copolyester represented by the following formula: ##STR16## wherein A and F are either ##STR17## R 1 is a divalent hydrocarbon radical of 2-15 carbon atoms; R is ethylene, propylene, isopropylene or butylene; X is Cl or Br and when X is Cl m is 3.62-52.2, n is 0.510-51.0, and l is 0.345 -26.3, and when X is Br, m is 5.86-53.8, n is 4.82-53.7 and l is 0.152-8.93; p is 0.560 -26.8; and q is 0.280-25.8, with the proviso that when A or F is q is a value inclusive of A and F; and, B. from 5-50% by weight of the composition of glass fiber reinforcing agent, said glass fibers being present during the reaction forming the reaction product of (A).
Claim 11
Dependent Claim
170 words
A reinforced flame retardant thermoplastic polyester molding resin composition comprising A. a flame retardant thermoplastic polyester which is the reaction product of a low molecular weight modified polybutylene terephthalate with a polyfunctional isocyanate, said reaction product having a number average molecular weight of 18000-60000 and being a random copolyester represented by the following formula: ##STR16## wherein A and F are either ##STR17## R 1 is a divalent hydrocarbon radical of 2-15 carbon atoms; R is ethylene, propylene, isopropylene or butylene; X is Cl or Br and when X is Cl m is 3.62-52.2, n is 0.510-51.0, and l is 0.345 -26.3, and when X is Br, m is 5.86-53.8, n is 4.82-53.7 and l is 0.152-8.93; p is 0.560 -26.8; and q is 0.280-25.8, with the proviso that when A or F is q is a value inclusive of A and F; and, B. from 5-50% by weight of the composition of glass fiber reinforcing agent, said glass fibers being present during the reaction forming the reaction product of (A).
Claim 12
Dependent Claim
30 words
The composition of claim 9 which further comprises an epoxy compound having an epoxy equivalency in the range of 170-1600, in an amount of 0.1-5% by weight of the composition.
Claim 13
Dependent Claim
15 words
The composition of claim 10 wherein the epoxy is a glycidyl ether of bisphenol A.
Claim 14
Dependent Claim
28 words
The composition of claim 9 in which the amount of halogen is from 2-20% by weight based on the total weight of the flame retardant thermoplastic polyester (A).
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |