US3653803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin and ethylene-amino acrylate copolymer blend dilute acid scoured and dyed
Assignee: EIDP Inc
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Filing: 1969-12-11
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Granted: 1972-04-04
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Expires: 1989-12-11
Abstract
Abstract A process for acid dyeing polyolefin (isotactic polypropylene) shaped articles such as fibers is provided which gives full penetration of dye to heavy denier round fibers in relatively short periods of time as well as adequate penetration of very heavy tape and fibrillated film fibers. This process comprises (1) extruding a uniform blend of the polyolefin with about 2 to 15 percent by weight of a thermoplastic, essentially compatible nitrogen-containing polymer such as a copolymer of ethylene and dimethylaminoethyl methacrylate into fibers, (2) exposing the fibers to an aqueous prescour solution which contains about 3 to 200 percent, on weight of fiber, of various scour materials, preferably sodium bisulfate, and optionally a non-ionic surfactant, at a temperature of about 80* to 1290* C., and (3) exposing the fibers to an acid dye bath, containing an acid dye, a premetallized dye, a disperse dye or mixtures thereof.
Inventors
- 👤 Clarence Frederick Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/79; D06P3/794; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; D06P3/791; Y; Y10; Y10S; Y10S8/00; Y10S8/904; Y10S8/929; Y10S8/93; Y10S8/931
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the polyolefin is isotactic polypropylene and the shaped articles are fibers.
Claim 2
Dependent Claim
24 words
The process of claim 2 wherein the prescour solution additionally contains about 0.25 to 2 percent, on weight of fiber, of a non-ionic surfactant.
Claim 3
Dependent Claim
22 words
The process of claim 3 wherein the prescour solution contains about 5 to 15 percent, on weight of fiber, of sodium bisulfate.
Claim 4
Dependent Claim
16 words
The process of claim 4 wherein a non-ionic spinning finish is applied to the extruded fibers.
Claim 5
Dependent Claim
24 words
The process of claim 4 wherein the dye bath additionally contains about 0.25 to 2 percent, on weight of fiber, of a non-ionic surfactant.
Claim 6
Dependent Claim
13 words
The process of claim 6 wherein the dye bath additionally contains a carrier.
Claim 7
Dependent Claim
198 words
The process of claim 7 wherein the carrier is a hydrocarbon, chlorinated hydrocarbon or mixtures of either. 9 A process for dyeing fibers based on polypropylene comprising: (1) uniformly blending isotactic polypropylene with about 4 to 10 percent by weight of an ethylene copolymer of about 60 to 80 percent by weight ethylene and about 40 to 20 percent by weight of an amino acrylate of the formula: wherein R is hydrogen or methyl; R1 is hydrogen or alkyl of one to three carbon atoms; R2 is alkyl of one to three carbon atoms, or t-butyl when R1 is hydrogen; and A is alkylene of two to three carbon atoms; (2) extruding the uniform blend into fibers; (3) exposing the fibers to a dilute aqueous prescour bath which is separate from the dye bath containing about 5 to 15 percent, on weight of fiber, of sodium bisulfate and about 0.25 to 2 percent, on weight of fiber, of a non-ionic surfactant at a temperature of about 80* to 120* C.; and (4) exposing the prescoured fibers to an acid dye bath containing an acid dye, said bath having a pH within the range of about 3 to 7.
Claim 8
Dependent Claim
12 words
The process of claim 9 wherein the amino acrylate is dimethylaminoethyl methacrylate.
Claim 9
Dependent Claim
24 words
The process of claim 10 wherein the dye bath additionally contains about 0.25 to 2 percent, on weight of fiber, of a non-ionic surfactant.
Claim 10
Dependent Claim
35 words
The process of claim 11 wherein the extruded fibers are round fibers of about 1 to 60 denier and the initial pH of the dye bath is within the range of about 3 to 5.
Claim 11
Dependent Claim
73 words
The process of claim 11 wherein the extruded fibers are tape fibers of about 500 to 1,500 denier and are dyed together with nylon fibers in a dye bath containing both an anionic and non-ionic surfactant and in which the initial pH of the dye bath is within the range of about 6 to 7 and is decreased to less than pH 4 when the bath temperature reaches at least about 80* 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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |