US3953405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing low pilling effect polyester fiber products
Assignee: Huels AG
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Filing: 1974-08-05
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Granted: 1976-04-27
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Expires: 1994-08-05
Abstract
Abstract An improvement in the process of melt spinning ethylene terephthalate polyester to produce textile fibers with decreased pilling in the threads, fibers or fabrics made therefrom. The ethylene terephthalate is melt polymerized in the presence of a condensation catalyst to a final temperature of about 250°C - 300°C and a final pressure of less than 10 mm mercury to form an anhydrous melt. A substituted cyclobutanedecarboxylic acid, preferably α-truxillic acid, is added to the melt-polymerization at a concentration of about 0.05-5 molepercent of the acid component. Melt spinning of the modified polyester is carried out and the fibers are irradiated with high energy light.
Inventors
- 👤 Roland Feinauer
- 👤 Karl-Heinz Magosch
- 👤 Jorn Ruter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
D; D06; D06M; D06M10/00; D06M10/001
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
An improvement in the process of melt spinning ethylene terephthalate polyester to produce textile fibers having substantially decreased pilling in fabrics containing the fibers comprising melt polymerizing ethylene terephthalate in the presence of a condensation catalyst to a final temperature of about 250°C to 300°C and a final pressure of less than 10 mm of mercury to form an anhydrous melt, the improvement comprising: conducting said melt polymerizing in the presence of about 0.05 to 5.0 mole percent, with respect to the acid component, of a substituted cyclobutanedicarboxylic acid; melt spinning said anhydrous melt; and exposing said melt spun fibers to irradiation with high energy light.
Claim 2
Dependent Claim
106 words
An improvement in the process of melt spinning ethylene terephthalate polyester to produce textile fibers having substantially decreased pilling in fabrics containing the fibers comprising melt polymerizing ethylene terephthalate in the presence of a condensation catalyst to a final temperature of about 250°C to 300°C and a final pressure of less than 10 mm of mercury to form an anhydrous melt, the improvement comprising: conducting said melt polymerizing in the presence of about 0.05 to 5.0 mole percent, with respect to the acid component, of a substituted cyclobutanedicarboxylic acid; melt spinning said anhydrous melt; and exposing said melt spun fibers to irradiation with high energy light.
Claim 3
Dependent Claim
14 words
The process of claim 1, wherein said substituted cyclobutane-dicarboxylic acid is a phenylsubstituted one.
Claim 4
Dependent Claim
13 words
The process of claim 2, wherein said substituted cyclobutanedicarboxylic acid is α-truxillic acid.
Claim 5
Dependent Claim
25 words
The process of claim 3, wherein the concentration of said α-truxillic acid is about 0.1 to 2.0 mole percent, with respect to the acid component.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein said high energy light is ultra violet light with wave lengths of about 250 to 400 millimicrons.
Claim 7
Dependent Claim
106 words
An improvement in the process of melt spinning ethylene terephthalate polyester to produce textile fibers having substantially decreased pilling in fabrics containing the fibers comprising melt polymerizing ethylene terephthalate in the presence of a condensation catalyst to a final temperature of about 250°C to 300°C and a final pressure of less than 10 mm of mercury to form an anhydrous melt, the improvement comprising: conducting said melt polymerizing in the presence of about 0.05 to 5.0 mole percent, with respect to the ester component, of a substituted cyclobutanedicarboxylic ester; melt spinning said anhydrous melt; and exposing said melt spun fibers to irradiation with high energy light.
Claim 8
Dependent Claim
106 words
An improvement in the process of melt spinning ethylene terephthalate polyester to produce textile fibers having substantially decreased pilling in fabrics containing the fibers comprising melt polymerizing ethylene terephthalate in the presence of a condensation catalyst to a final temperature of about 250°C to 300°C and a final pressure of less than 10 mm of mercury to form an anhydrous melt, the improvement comprising: conducting said melt polymerizing in the presence of about 0.05 to 5.0 mole percent, with respect to the ester component, of a substituted cyclobutanedicarboxylic ester; melt spinning said anhydrous melt; and exposing said melt spun fibers to irradiation with high energy light.
Claim 9
Dependent Claim
14 words
The process of claim 6, wherein said substituted cyclobutanedicarboxylic ester is a phenylsubstituted one.
Claim 10
Dependent Claim
17 words
The process of claim 7, wherein said substituted cyclobutanedicarboxylic ester is the dimethyl ester of α-truxillic acid.
Claim 11
Dependent Claim
29 words
The process of claim 8, wherein the concentration of said dimethyl ester of a α-truxillic acid is about 0.1 to 2.0 mole percent, with respect to the ester component.
Claim 12
Dependent Claim
23 words
The process of claim 6, wherein said high energy light is ultra violet light with wave lengths of about 250 to 400 millimicrons.
Claim 13
Dependent Claim
59 words
The process of claim 2, wherein said phenyl substituted cyclobutane dicarboxylic acid is selected from the group consisting of α-truxillic acid, dimethyl ester of α-truxillic acid, diethyl ester of α-truxillic acid, β-truxinic acid, dimethyl ester of β-truxinic acid, diethyl ester of β-truxinic acid, δ -truxinic acid, dimethyl ester of δ -truxinic acid and diethyl ester of δ -truxinic acid.
Claim 14
Dependent Claim
59 words
The process of claim 7, wherein said phenyl substituted cyclobutane dicarboxylic acid is selected from the group consisting of α-truxillic acid, dimethyl ester of α-truxillic acid, diethyl ester of α-truxillic acid, β-truxinic acid, dimethyl ester of β-truxinic acid, diethyl ester of β-truxinic acid, δ -truxinic acid, dimethyl ester of δ -truxinic acid and diethyl ester of δ -truxinic acid.
Claim 15
Dependent Claim
9 words
The product obtained by the process of claim 1.
Claim 16
Dependent Claim
9 words
The product obtained by the process of claim 6.
References Cited (Backward Citations)
JPS4220850Y1
Cited
US3822239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |