US3960686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing low pilling effect polyester fiber products
Assignee: Huels AG
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Filing: 1974-12-27
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Granted: 1976-06-01
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Expires: 1994-12-27
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°- 300°C and a final pressure of less than 10 mm mercury to form an anhydrous melt. A substituted cyclobutanedimethanol, preferably 2,4-diphenyl-cyclobutanedimethanol-1,3, is added to the melt-polymerization at a concentration of about 0.05 - 5 mole percent of the substituted cyclobutanedimethanol component. Melt spinning of the modified polyester is carried out and the fibers are irradiated with high energy light.
Inventors
- 👤 Karl Heinz Magosch
- 👤 Roland Feinauer
- 👤 Jorn Ruter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:34
CPC Classifications
D; D06; D06M; D06M10/00; D06M10/04; D06M10/08; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199; D01; D01F; D01F6/00; D01F6/78; D01F6/84; D06M2101/00; D06M2101/16; D06M2101/30; D06M2101/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 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° 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 of a substituted cyclobutanedimethanol; melt spinning said anhydrous melt; and exposing said melt spun fibers to irradiation with high energy light.
Claim 2
Dependent Claim
99 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° 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 of a substituted cyclobutanedimethanol; melt spinning said anhydrous melt; and exposing said melt spun fibers to irradiation with high energy light.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein said substituted cyclobutanedimethanol is 2,4-diphenyl-cyclobutanedimethanol-1,3.
Claim 4
Dependent Claim
18 words
The process of claim 2, wherein the concentration of said 2,4-diphenyl-cyclobutanedimethanol-1,3 is about 0.1 to 2.0 mole percent.
Claim 5
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 6
Dependent Claim
9 words
The product obtained by the process of claim 1.
Claim 7
Dependent Claim
12 words
The process of claim 4, wherein said substituted cyclobutanedimethanol is aryl substituted.
Claim 8
Dependent Claim
22 words
The process of claim 4, wherein said substituted cyclobutanedimethanol is selected from the group consisting of 2,4-diphenyl-cyclobutanedimethanol-1,3; 3,4-diphenyl-cyclobutanedimethanol-1,2 and substituted derivatives thereof.
Claim 9
Dependent Claim
11 words
The process of claim 4, wherein said substituted cyclobutanedimethanol is 3,4-diphenyl-cyclobutanedimethanol-1,2.
References Cited (Backward Citations)
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US3329758A
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US3335209A
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US3525754A
Cited
US3594350A
Cited
US3852247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |