US5130069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing dyeable hot-bulked polypropylene fibers modified with a copolyamide
Assignee: Invista North America LLC
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Filing: 1990-07-27
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Granted: 1992-07-14
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Expires: 2010-07-27
Abstract
Abstract Dyeable fibers are formed from polypropylene by blending a major portion of polypropylene with a minor portion of 1) a copolymer of nylon 6,6 and substantially equimolar amounts of hexamethylene diamine and an alkali metal salt of 5-sulfoisophthalic acid or 2) a basic reaction product of substantially equimolar amounts of N-(2-aminoethyl) piperazine and adipic acid, hexamethylene diamine and adipic acid and optionally ε-caprolactam. The blend is formed in an extruder and extruded into filaments which are quenched in air, stretched 2-4× (preferably at an elevated temperature) and bulked using a jet of heated turbulent fluid. The thusly bulked filaments are then dyed.
Inventors
- 👤 Raymond F. Tietz
- 👤 Wae-Hai Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:45
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/16; D02G1/165; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; Y; Y10; Y10S; Y10S57/00; Y10S57/908; Y10S8/00; Y10S8/92
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
168 words
A process for producing dyeable filaments formed of a blend of 85 to 96 weight percent isotactic polypropylene having a melt flow index of from 4 to 45 and 4 to 15 weight percent of either a random copolymer of hexamethylene adipamide and a substantially equimolar mixture of hexamethylene diamine and 7 to 25 weight percent based on final copolymer weight of an alkali metal salt of 5-sulfoisophthalic acid or a derivative thereof, or a basic random, copolyamide which is the reaction product of 30 to 50 weight percent of N-(2-aminoethyl) piperazinium adipamide, from 40 to 60 weight percent hexamethylene adipamide and up to 30 weight percent ε-caprolactam comprising melt extruding a filament of such blend, stretching said filament from 2 to 4 times its original length, bulking the thus formed stretched filament using a rapidly moving heated fluid at a temperature of from 105° to 150° C. to form a bulked filament and applying a dye solution to said stretched bulked filament to produce a dyed filament.
Claim 2
Dependent Claim
168 words
A process for producing dyeable filaments formed of a blend of 85 to 96 weight percent isotactic polypropylene having a melt flow index of from 4 to 45 and 4 to 15 weight percent of either a random copolymer of hexamethylene adipamide and a substantially equimolar mixture of hexamethylene diamine and 7 to 25 weight percent based on final copolymer weight of an alkali metal salt of 5-sulfoisophthalic acid or a derivative thereof, or a basic random, copolyamide which is the reaction product of 30 to 50 weight percent of N-(2-aminoethyl) piperazinium adipamide, from 40 to 60 weight percent hexamethylene adipamide and up to 30 weight percent ε-caprolactam comprising melt extruding a filament of such blend, stretching said filament from 2 to 4 times its original length, bulking the thus formed stretched filament using a rapidly moving heated fluid at a temperature of from 105° to 150° C. to form a bulked filament and applying a dye solution to said stretched bulked filament to produce a dyed filament.
Claim 3
Dependent Claim
39 words
The process of claim 1 wherein the filament is a blend of polypropylene and a random copolymer of hexamethylene adipamide and substantially equimolar amounts of hexamethylene diamine and an alkali metal salt of 5-sulfoisophthalic acid or a derivative thereof.
Claim 4
Dependent Claim
28 words
The process of claim 2 wherein the random copolymer contains from 10 to 25 weight percent of the alkali metal salt of 5-sulfoisophthalic acid or a derivative thereof.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the filament is stretched using draw roll heated from 120° to 145° C.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the fluid used to bulk the filaments is air.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the filament is dyed in a dyebath.
Claim 8
Dependent Claim
30 words
The process of claim 6 wherein the blend forming the filament contains from 90 to 96 weight percent polypropylene and from 4 to 10 weight percent of the random copolymer.
Claim 9
Dependent Claim
12 words
The process of claim 7 wherein the dye is a cationic dye.
Claim 10
Dependent Claim
32 words
The process of claim 1 wherein the filament is a blend of polypropylene and a basic random copolyamide which is the reaction product of N-(2-aminoethyl) piperazinium adipamide, hexamethylene adipamide and optionally ε-caprolactam.
Claim 11
Dependent Claim
20 words
The process of claim 9 wherein the filament is stretched using draw rolls heated to from 120° to 145° C.
Claim 12
Dependent Claim
15 words
The process of claim 10 wherein the fluid used to bulk the filaments is air.
Claim 13
Dependent Claim
13 words
The process of claim 11 wherein the filament is dyed in a dyebath.
Claim 14
Dependent Claim
21 words
The process of claim 12 wherein the blend forming the filament contains from 4 to 10 weight percent basic random copolyamide.
Claim 15
Dependent Claim
12 words
The process of claim 13 wherein the dye is an acid dye.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |