US4063887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the water absorption of polyester fibers
Assignee: Celanese Corp
•
Filing: 1976-07-22
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Granted: 1977-12-20
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Expires: 1996-07-22
Abstract
Abstract The water absorbency of normally hydrophobic polyester fibers is improved by contacting (e.g., by immersing) these fibers in an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines, and mixtures thereof.
Inventors
- 👤 Alex S. Forschirm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/368
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
55 words
A process for improving the water absorbency of polyester fibers which comprises contacting said polyester fibers at a temperature of from about 20° to about 140° C with an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines and mixtures thereof and having a pH of at least 7.
Claim 2
Dependent Claim
55 words
A process for improving the water absorbency of polyester fibers which comprises contacting said polyester fibers at a temperature of from about 20° to about 140° C with an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines and mixtures thereof and having a pH of at least 7.
Claim 3
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the hydroxyamine is 2-diethylaminoethanol.
Claim 4
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the hydroxyamine is diethanolamine.
Claim 5
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the hydroxyamine is triethanolamine.
Claim 6
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the hydroxyamine is ethanolamine.
Claim 7
Dependent Claim
40 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the polyester contains from about 85 to 100 mole percent polyethylene terephthalate and 0 to 15 mole percent of copolymerized ester units other than polyethylene terephthalate.
Claim 8
Dependent Claim
20 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the polyester is substantially polyethylene terephthalate.
Claim 9
Dependent Claim
20 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the polyester is poly-1,4-cyclohexane dimethanol terephthalate.
Claim 10
Dependent Claim
34 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the temperature of said aqueous solution at the time of said contact is from about 70 to about 130° C.
Claim 11
Dependent Claim
26 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the polyester fibers are in fabric form when contacted with said solution.
Claim 12
Dependent Claim
43 words
The process for improving the water absorbency of polyester fibers of claim 1 wherein the polyester fibers are immersed in an aqueous solution having a pH of about 7 to about 9 at a temperature of from about 80° to about 120° C.
Claim 13
Dependent Claim
37 words
The process for improving the water absorbency of the polyester fibers of claim 1 wherein the polyester fibers are polyethylene terephthalate and at the time of said contact with said aqueous solution are blended with cotton fibers.
Claim 14
Dependent Claim
79 words
A process for improving the water absorbency of polyester fibers which comprises contacting said polyester fibers with an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines and mixtures thereof and having a pH of at least 7.0, while at a temperature in excess of the boiling point of water and below the temperature at which the properties of the fiber are deleteriously influenced and at a pressure in excess of atmospheric pressure.
Claim 15
Dependent Claim
79 words
A process for improving the water absorbency of polyester fibers which comprises contacting said polyester fibers with an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines and mixtures thereof and having a pH of at least 7.0, while at a temperature in excess of the boiling point of water and below the temperature at which the properties of the fiber are deleteriously influenced and at a pressure in excess of atmospheric pressure.
Claim 16
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the hydroxyamine is 2-diethylaminoethanol.
Claim 17
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the hydroxyamine is diethanolamine.
Claim 18
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the hydroxyamine is triethanolamine.
Claim 19
Dependent Claim
18 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the hydroxyamine is ethanolamine.
Claim 20
Dependent Claim
40 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the polyester contains from about 85 to 100 mole percent polyethylene terephthalate and 0 to 15 mole percent of copolymerized ester units other than polyethylene terephthalate.
Claim 21
Dependent Claim
20 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the polyester is substantially polyethylene terephthalate.
Claim 22
Dependent Claim
20 words
The process for improving the water absorbency of polyester fibers of claim 13, wherein the polyester is poly-1,4-cyclohexane diemthanol terephthalate.
Claim 23
Dependent Claim
33 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the temperature of said aqueous solution at the time of said contact close does not exceed about 140° C.
Claim 24
Dependent Claim
36 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein said aqueous solution at the time of said contact is maintained at a pressure of about 15 psi to about 55 psi.
Claim 25
Dependent Claim
26 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the polyester fibers are in fabric form when contacted with said solution.
Claim 26
Dependent Claim
32 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the polyester fibers are immersed in said aqueous solution having a pH of about 7.0 to about 9.0.
Claim 27
Dependent Claim
37 words
The process for improving the water absorbency of the polyester fibers of claim 13 wherein the polyester fibers are polyethylene terephthalate and at the time of said contact with said aqueous solution are blended with cotton fibers.
Claim 28
Dependent Claim
46 words
The process for improving the water absorbency of polyester fibers of claim 13 wherein the polyester fibers are contacted with said aqueous solution for a period of about 2 hours while at a temperature of about 120° C and at a pressure of about 30 psi.
Claim 29
Dependent Claim
88 words
A process for improving the water absorbency of a fabric comprising polyester fibers containing 85 to 100 mole percent polyethylene terephthalate and 0 to 15 mole percent of copolymerized ester units other than the polyethylene terephthalate which comprises contacting said fabric with an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines and mixtures thereof and having a pH of at least 7.0, by immersing said fabric in said aqueous solution at a temperature of from about 20° to about 140° C.
Claim 30
Dependent Claim
88 words
A process for improving the water absorbency of a fabric comprising polyester fibers containing 85 to 100 mole percent polyethylene terephthalate and 0 to 15 mole percent of copolymerized ester units other than the polyethylene terephthalate which comprises contacting said fabric with an aqueous solution of a hydroxyamine selected from the group consisting of monohydroxyamines, dihydroxyamines, and trihydroxyamines and mixtures thereof and having a pH of at least 7.0, by immersing said fabric in said aqueous solution at a temperature of from about 20° to about 140° C.
Claim 31
Dependent Claim
18 words
The process for improving the water absorbency of the fabric of claim 27 wherein the hydroxyamine is diethanolamine.
Claim 32
Dependent Claim
18 words
The process for improving the water absorbency of the fabric of claim 27 wherein the hydroxyamine is diethanolamine.
Claim 33
Dependent Claim
18 words
The process for improving the water absorbency of the fabric of claim 27 wherein the hydroxyamine is triethanolamine.
Claim 34
Dependent Claim
18 words
The process for improving the water absorbency of the fabric of claim 27 wherein the hydroxyamine is ethanolamine.
Claim 35
Dependent Claim
28 words
The process for improving the water absorbency of the fabric of claim 27 wherein the fabric comprises from 0 to 15 mole percent of poly 1,4-cyclohexane dimethanol terephthalate.
Claim 36
Dependent Claim
25 words
The process for improving the water absorbency of the fabric of claim 27 wherein the polyester fibers of said fabric are blended with cotton fibers.
Claim 37
Dependent Claim
35 words
The process for improving the water absorbency of the fabric of claim 27 wherein said fabric is immersed in said aqueous solution of hydroxyamine at a temperature of from about 70° to about 130° C.
Claim 38
Dependent Claim
35 words
The process for improving the water absorbency of the fabric of claim 27 wherein said fabric is immersed in said aqueous solution of hydroxyamine at a temperature of from about 80° to about 120° C.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |