Patent US4456581A successfully refreshed from Google Patents.
Patent US3900527A successfully refreshed from Google Patents.
US3900527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of basic dyeable polyester from terephthalic acid
Assignee: Monsanto Co
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Filing: 1973-04-16
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Granted: 1975-08-19
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Expires: 1993-04-16
Abstract
Abstract Fiber-forming cationic dyeable copolyesters are prepared noncontinuously by reacting a low molecular weight glycoldicarboxylic acid prepolymer having a carboxyl concentration of not more than 2000 Mu eq/g and an intrinsic viscosity of not more than 0.07 with a glycol solution of a bis glycol ester of a difunctional aromatic compound possessing one or more metallo sulfonate groups and of such concentration that the resulting glycol/dicarboxylic acid moiety ratio is at least about 1.6.
Inventors
- 👤 Henry L King
- 👤 John W Mcgee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:52
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
A METHOD FOR PRODUCING FIBER-FORMING MODIFIED POLYESTERS NON-CONTINUOUSLY WHICH COMPRISES (1) FORMING A REACTION PRODUCT CONSISTING OF AT LEAST 85% BY WEIGHT OF THE POLYESTER OF AN AROMATIC DICARBOXYLIC ACID AND A POLYMETHYLENE GLYCOL SELECTED FROM GROUP CONSISTING OF THOSE HAVING THE FORMULA HO(CH2)NOH, WHEREIN N IS AN INTEGER FROM 2 TO 10, AND CYCLOHEXANE DIMETHANOL BY REACTING SAID ACID AND SAID GYCOL UNDER ESTERIFICATION CONDITIONS UNTIL SAID REACTION PRODUCT HAS A CARBOXYL LEVEL OF NOT MORE THAN 200 UEG/G AND AN INTRISIC VICOSITY OF NOT MORE THAN 0.07: AND (2) REATING WITH SAID REACTION PRODUCT A GLYCOL SOLUTON OF A BIS GLYCOL ESTER OF A DIFUNCTIONAL AROMATIC COMPOUND POSSESSING A METALLO SULFONATE GROUP OF SUCH CONCENTRATION THAT WHEN SAID BIS GLYCOL ESTER IS MIXED WITH SAID PREPOLYMER, THE RESULTING GLYCOL/DICARBOXYLIC ACID MOIETY RATIO IS AT LEAST ABOUT 1.6: AND COPOLYMERIZING SAID POLYCONDENSING SAID REACTANTS AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 65*C TO ABOUT 325*C UNTIL THE RESULTING POLYMER ATTAINS AN INTRINSIC VICOSITY IN THE RANGE OF ABOUT 0.3 -0.8.
Claim 2
Independent Claim
173 words
A METHOD FOR PRODUCING FIBER-FORMING MODIFIED POLYESTERS NON-CONTINUOUSLY WHICH COMPRISES (1) FORMING A REACTION PRODUCT CONSISTING OF AT LEAST 85% BY WEIGHT OF THE POLYESTER OF AN AROMATIC DICARBOXYLIC ACID AND A POLYMETHYLENE GLYCOL SELECTED FROM GROUP CONSISTING OF THOSE HAVING THE FORMULA HO(CH2)NOH, WHEREIN N IS AN INTEGER FROM 2 TO 10, AND CYCLOHEXANE DIMETHANOL BY REACTING SAID ACID AND SAID GYCOL UNDER ESTERIFICATION CONDITIONS UNTIL SAID REACTION PRODUCT HAS A CARBOXYL LEVEL OF NOT MORE THAN 200 UEG/G AND AN INTRISIC VICOSITY OF NOT MORE THAN 0.07: AND (2) REATING WITH SAID REACTION PRODUCT A GLYCOL SOLUTON OF A BIS GLYCOL ESTER OF A DIFUNCTIONAL AROMATIC COMPOUND POSSESSING A METALLO SULFONATE GROUP OF SUCH CONCENTRATION THAT WHEN SAID BIS GLYCOL ESTER IS MIXED WITH SAID PREPOLYMER, THE RESULTING GLYCOL/DICARBOXYLIC ACID MOIETY RATIO IS AT LEAST ABOUT 1.6: AND COPOLYMERIZING SAID POLYCONDENSING SAID REACTANTS AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 65*C TO ABOUT 325*C UNTIL THE RESULTING POLYMER ATTAINS AN INTRINSIC VICOSITY IN THE RANGE OF ABOUT 0.3 -0.8.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said carboxyl level is about 500-900 Mu eq/g.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the intrinsic viscosity of said prepolymer is about 0.07.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the content of diethylene glycol in said prepolymer is about 0.60% DEG.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the resulting glycol/dicarboxylic acid reaction product moiety ratio is about 1.33/1.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein said resulting glycol/dicarboxylic acid moiety ratio after addition of sulfonate containing additive is 1.66-1.92/1.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein said aromatic compound possessing a sulfonic acid group is 5-sodium sulfo isophthalic acid.
Claim 9
Dependent Claim
37 words
The method of claim 1 wherein said reaction product consisting of 85% by weight of the polyester of an aromatic dicarboxylic acid and polymethylene glycol is produced continuously starting with the dicarboxylic acid and the polymethylene glycol.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein the dicarboxylic acid is terephthalic acid.
Claim 11
Dependent Claim
11 words
The method of claim 1 wherein the glycol is ethylene glycol.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |