US4008207A
Expired / Lapsed
US
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Process for preparing polyesters for opaque film use
Assignee: Teijin Ltd
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Filing: 1975-05-05
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Granted: 1977-02-15
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Expires: 1995-05-05
Abstract
Abstract A process for preparing a polyester by carrying out the ester-interchange reaction of a lower alkyl ester of terephthalic acid and a glycol in the presence of a calcium compound and a lithium compound having ester-interchange catalysis capacities in amounts satisfying all of the following relationships: 0.03≦Ca≦0.50 1. 0.10=Li≦0.80 2. 0.30≦0.5 Ca + Li≦1.00 3. and ##EQU1## WHEREIN Ca, Li and P are respectively the mol percentages of calcium, lithim and phosphorus compounds based on the lower alkyl ester of terephthalic acid, thereafter adding to the reaction system a phosphorus compound of the formula ##STR1## WHEREIN R is a member selected from the group consisting of the alkyl, aryl and hydroxyalkyl groups, n is selected from the class consisting of 0 to 1, 1 is a whole number up to 2, including O, m is a whole number from 1 to 3, with the proviso that the sum of 1 and m is 3, in an amount satisfying said relationship (4), the addition being made at a point in the process up until completion of said polycondensation reaction, and thereafter effecting the polycondensation reaction of the resulting product.
Inventors
- 👤 Yorihiko Omoto
- 👤 Teruo Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08G63/87; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
In preparing a polyester by carrying out the ester-interchange reaction of a lower alkyl ester of terephthalic acid and a glycol and thereafter effecting the polycondensation reaction of the resulting product, the improvement for preparing a polymer for opaque film use which comprises carrying out said ester-interchange reaction in the presence of a calcium compound and a lithium compound having ester-interchange catalysis capacities in amounts satisfying all of the following relationships: 0.03≦Ca≦0.50 1. 0.10≦Li≦0.80 2. 0.30≦ 0.5 Ca + Li≦1.00 3. and ##EQU8## wherein Ca, Li and P are respectively the mol percentages of calcium, lithium and phosphorus compounds based on the lower alkyl ester of terephthalic acid, and thereafter adding to the reaction system a phosphorus compound of the formula ##STR3## wherein R is a member selected from the group consisting of the alkyl, aryl and hydroxyalkyl groups, n is selected from the class consisting of 0 and 1, l is a whole number up to 2, including 0, m is a whole number from 1 to 3, with the proviso that the sum of l and m is 3, in an amount satisfying said relationship (4), the addition being made at a point in the process up until completion of said polycondensation reaction.
Claim 2
Dependent Claim
205 words
In preparing a polyester by carrying out the ester-interchange reaction of a lower alkyl ester of terephthalic acid and a glycol and thereafter effecting the polycondensation reaction of the resulting product, the improvement for preparing a polymer for opaque film use which comprises carrying out said ester-interchange reaction in the presence of a calcium compound and a lithium compound having ester-interchange catalysis capacities in amounts satisfying all of the following relationships: 0.03≦Ca≦0.50 1. 0.10≦Li≦0.80 2. 0.30≦ 0.5 Ca + Li≦1.00 3. and ##EQU8## wherein Ca, Li and P are respectively the mol percentages of calcium, lithium and phosphorus compounds based on the lower alkyl ester of terephthalic acid, and thereafter adding to the reaction system a phosphorus compound of the formula ##STR3## wherein R is a member selected from the group consisting of the alkyl, aryl and hydroxyalkyl groups, n is selected from the class consisting of 0 and 1, l is a whole number up to 2, including 0, m is a whole number from 1 to 3, with the proviso that the sum of l and m is 3, in an amount satisfying said relationship (4), the addition being made at a point in the process up until completion of said polycondensation reaction.
Claim 3
Dependent Claim
204 words
In preparing a polyester by carrying out the ester-interchange reaction of a lower alkyl ester of terephthalic acid and a glycol and thereafter effecting the polycondensation reaction of the resulting product, the improvement for preparing a polymer for opaque film use which comprises carrying out said ester-interchange reaction in the presence of a calcium compound and a lithium compound having ester-interchange catalysis capacities, in amounts satisfying all of the following relationships: 0.05≦Ca≦0.40 1' 0.20≦Li≦0.60 2' 0.35≦0.5 Ca + Li≦0.80 3' and ##EQU9## wherein Ca, Li and P are respectively the mol percentages of calcium, lithium and phosphorus compounds based on the lower alkyl ester of terephthalic acid, and thereafter adding to the reaction system a phosphorus compound of the formula ##STR4## wherein R is a member selected from the group consisting of the alkyl, aryl and hydroxyalkyl group, n is selected from the class consisting of 0 and 1, l is a whole number up to 2, including 0, m is a whole number from 1 to 3, with the proviso that the sum of l and m is 3, in an amount satisfying said relationship (4), the addition being made at a point in the process up until completion of said polycondensation reaction.
Claim 4
Dependent Claim
204 words
In preparing a polyester by carrying out the ester-interchange reaction of a lower alkyl ester of terephthalic acid and a glycol and thereafter effecting the polycondensation reaction of the resulting product, the improvement for preparing a polymer for opaque film use which comprises carrying out said ester-interchange reaction in the presence of a calcium compound and a lithium compound having ester-interchange catalysis capacities, in amounts satisfying all of the following relationships: 0.05≦Ca≦0.40 1' 0.20≦Li≦0.60 2' 0.35≦0.5 Ca + Li≦0.80 3' and ##EQU9## wherein Ca, Li and P are respectively the mol percentages of calcium, lithium and phosphorus compounds based on the lower alkyl ester of terephthalic acid, and thereafter adding to the reaction system a phosphorus compound of the formula ##STR4## wherein R is a member selected from the group consisting of the alkyl, aryl and hydroxyalkyl group, n is selected from the class consisting of 0 and 1, l is a whole number up to 2, including 0, m is a whole number from 1 to 3, with the proviso that the sum of l and m is 3, in an amount satisfying said relationship (4), the addition being made at a point in the process up until completion of said polycondensation reaction.
Claim 5
Dependent Claim
22 words
The process of claim 1 which comprises adding said phosphorus compound at a point where said ester-interchange reaction has been substantially completed.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said polyester is polyethylene terephthalate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |