US3899470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for preparation of basic dyeable polyester
Assignee: Monsanto Co
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Filing: 1973-08-01
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Granted: 1975-08-12
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Expires: 1993-08-01
Abstract
Abstract Fiber-forming cationic dyeable copolyesters are prepared continuously by reacting a low molecular weight glycoldicarboxylic acid prepolymer having a carboxyl concentration of not more than 2,000 Mu eq/g and an intrinsic viscosity of not more than 0.10 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
- 👤 John W Mcgee
- 👤 Henry L King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
179 words
A METHOD FOR PRODUCING FIBER-FORMING MODIFIED POLYESTERS COMPRISES (1) FORMING A REACTION PRODUCT PREPOLYMER CONSISTING OF AT LEAST 85 PERCENT BY WEIGHT OF THE POLESTER OF AN AROMATIC DICARBOXYLIC ACID AND A POLYMETHLENE GYCOL SELECTED FROM THE 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 GLYCOL UNDER ESTERIFICATION CONDITIONS UNTIL SAID REACTION PRODUCT HAS A CARBOXYL LEVEL OF NOT MORE THAN 2000 U EQ/G AND AN INTRINISIC VISCOSITY OF NOT MORE THAN 0.10, AND (2) CONTINUOUSLY REACTING WITH SAID REACTION PRODUCT PREPOLYMER A GLYCOL SOLUTION 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 AND POLYCONDENSING SAID REACTANTS AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 120*C TO ABOUT 300* C UNTIL THE RESULTING POLYMER ATTAINS AN INTRINSIC VISCOSITY IN THE RANGE OF ABOUT 0.3 TO 0.8.
Claim 2
Independent Claim
179 words
A METHOD FOR PRODUCING FIBER-FORMING MODIFIED POLYESTERS COMPRISES (1) FORMING A REACTION PRODUCT PREPOLYMER CONSISTING OF AT LEAST 85 PERCENT BY WEIGHT OF THE POLESTER OF AN AROMATIC DICARBOXYLIC ACID AND A POLYMETHLENE GYCOL SELECTED FROM THE 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 GLYCOL UNDER ESTERIFICATION CONDITIONS UNTIL SAID REACTION PRODUCT HAS A CARBOXYL LEVEL OF NOT MORE THAN 2000 U EQ/G AND AN INTRINISIC VISCOSITY OF NOT MORE THAN 0.10, AND (2) CONTINUOUSLY REACTING WITH SAID REACTION PRODUCT PREPOLYMER A GLYCOL SOLUTION 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 AND POLYCONDENSING SAID REACTANTS AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 120*C TO ABOUT 300* C UNTIL THE RESULTING POLYMER ATTAINS AN INTRINSIC VISCOSITY IN THE RANGE OF ABOUT 0.3 TO 0.8.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said carboxyl level of the prepolymer 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 0.06-0.08.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the content of diethylene glycol in said prepolymer is not more than about 0.60 percent by weight.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the resulting total glycol/total dicarboxylic acid prepolymer reaction product moiety ratio is about 1.3/1.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein said resulting total glycol/total dicarboxylic acid moiety ratio after addition of sulfonate containing additive is 1.6-1.9/1.
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
41 words
The method of claim 1 wherein said reaction product prepolymer consisting of at least 85 percent 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
30 words
The method of claim 1 wherein excess glycol is removed from the reaction product prepolymer after addition of the bis glycol ester at a temperature not to exceed 260* C.
Claim 11
Dependent Claim
13 words
The method of claim 9 wherein excess glycol is removed at subatmospheric pressure.
Claim 12
Dependent Claim
14 words
The method of claim 9 wherein excess glycol is removed under an inert gas.
Claim 13
Dependent Claim
11 words
The method of claim 1 wherein all phases are conducted continuously.
Claim 14
Dependent Claim
12 words
The method of claim 1 wherein the dicarboxylic acid is terephthalic acid.
Claim 15
Dependent Claim
11 words
The method of claim 1 wherein the glycol is ethylene glycol.
References Cited (Backward Citations)
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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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |