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US3923924A Expired / Lapsed US ⏱️ 0.0 years remaining

Antistatic fiber containing chain-extended tetrols based on diamines

Assignee: Honeywell International Inc
•
Filing: 1974-11-29
•
Granted: 1975-12-02
•
Expires: 1994-11-29
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Abstract

Abstract It has been suggested that antistatic properties of fibers of polyamide could be improved by uniformly dispersing in the polyamide between about 1 percent and about 12 percent by weight of a predominantly branched, chain-extended propylene oxideethylene oxide copolymer based on a diamine. However, with incorporation of this antistatic additive in the polyamide, serious problems have been encountered in melt-spinning due to the frequent occurrence of ''''nubs'''' or enlarged places in the extruded polyamide filament. It has now been found that the occurrence of said nubs in the antistatic polyamide fiber can be greatly reduced by dispersing in the polymer about 0.5 to 12% by weight, based on the weight of the antistatic agent, of a phenol compound represented by the formula: In comparative tests with antistatic yarns containing various commercially available hindered phenol compounds, the yarns of the present invention showed significantly greater breaking strength retention after exposure to light in standard tests.

Inventors

  • 👤 Rodney Lee Wells
  • 👤 Lamberto Crescentini

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 10:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08L; C08L77/00; Y; Y10; Y10S; Y10S524/00; Y10S524/91; Y10S524/913

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 41 words
IN A PROCESS FOR THE FORMATION OF AN ANTISTATIC POLYAMIDE FIBER FROM A FIBER-FORMING POLYAMIDE POLYMER CONTAINING ABOUT 1% TO 12% BY WEIGHT OF AN ANTISTATIC COMPOUND WHICH IS A CHAIN-EXTENDED REACTION PRODUCT OF A TETROL COMPOUND REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim 41 words
IN A PROCESS FOR THE FORMATION OF AN ANTISTATIC POLYAMIDE FIBER FROM A FIBER-FORMING POLYAMIDE POLYMER CONTAINING ABOUT 1% TO 12% BY WEIGHT OF AN ANTISTATIC COMPOUND WHICH IS A CHAIN-EXTENDED REACTION PRODUCT OF A TETROL COMPOUND REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim 42 words
The process of claim 1 wherein the ethylene oxide moieties make up about 10% to about 90% of the molecular weight of the tetrol compound and the chain-extended antistatic compound has a melt viscosity of about 800 to 50,000 centipoises at 100*C.
Claim 4
Dependent Claim 29 words
The process of claim 2 wherein the phenol compound is selected from the group consisting of 4,4''-butylidene bis-(6-tert. butyl m-cresol); 4,4''-butylidene bis-(6-tert. amyl m-cresol); and 4,4''-heptylidene bis-(6-tert. butyl m-cresol).
Claim 5
Dependent Claim 27 words
The process of claim 1 wherein 1 to 6 percent based on the weight of the antistatic compound, of the phenol compound is dissolved in the extrudate.
Claim 6
Dependent Claim 42 words
The process of claim 4 wherein the ethylene oxide moieties make up about 10% to about 90% of the molecular weight of the tetrol compound and the chain-extended antistatic compound has a melt viscosity of about 800 to 50,000 centipoises at 100*C.
Claim 7
Dependent Claim 42 words
An antistatic polyamide fiber having less than 4 X 103 nubs per pound of fiber, said fiber containing about 1% to 12% by weight of an antistatic compound which is a chain-extended reaction product of a tetrol compound represented by the formula:
Claim 8
Dependent Claim 42 words
An antistatic polyamide fiber having less than 4 X 103 nubs per pound of fiber, said fiber containing about 1% to 12% by weight of an antistatic compound which is a chain-extended reaction product of a tetrol compound represented by the formula:
Claim 9
Dependent Claim 42 words
The fiber of claim 6 wherein the ethylene oxide moieties make up about 10% to about 90% of the molecular weight of the tetrol compound and the chain-extended antistatic compound has a melt viscosity of about 800 to 50,000 centipoises at 100*C.
Claim 10
Dependent Claim 29 words
The fiber of claim 7 wherein the phenol compound is selected from the group consisting of 4,4''-butylidene bis-(6-tert. butyl m-cresol); 4,4''-butylidene bis-(6-tert. amyl m-cresol); and 4,4''-heptylidene bis-(6-tert. butyl m-cresol).
Claim 11
Dependent Claim 26 words
The fiber of claim 6 wherein the fiber contains 1 to 6% by weight, based on the weight of the antistatic compound, of the phenol compound.
Claim 12
Dependent Claim 42 words
The fiber of claim 9 wherein the ethylene oxide moieties make up about 10% to about 90% of the molecular weight of the tetrol compound and the chain-extended antistatic compound has a melt viscosity of about 800 to 50,000 centipoises at 100*C.

References Cited (Backward Citations)

US2816945A Cited
US3624245A Cited
US3657386A Cited
US3772403A Cited
US3787524A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-12-01 1979-06-02 1979-12-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-12-01 1983-06-02 1983-12-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-12-01 1987-06-02 1987-12-02 $7700.00 Window Closed / Lapsed

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