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US5456982A
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Bicomponent synthesis fibre and process for producing same
Assignee: Danaklon AS
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Filing: 1993-03-29
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Granted: 1995-10-10
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Expires: 2013-03-29
Abstract
Abstract A thermobondable bicomponent synthetic fiber (8,14) with a length of at least about 3 mm, adapted to use in the blending of fluff pulp for the production of hygiene absorbent products, the fiber comprising an inner core component comprises a polyolefin or a polyester, the sheath component comprises a polyolefin, and the core component has a higher melting point than the sheath component, and a process for producing said fiber. The sheath-and-core type fiber is preferably made permanently substantially hydrophilic by incorporating s surface active agent into the sheath component. The long bicomponent fibers (20) form a strong supporting three-dimensional matrix structure (20,24) in the absorbent product upon thermobonding.
Inventors
- 👤 Anders S. Hansen
- 👤 Bjorn Marcher
- 👤 Peter Schloss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:50
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/542; D04H1/55; D01; D01F; D01F8/00; D01F8/04; D01F8/06; D04H1/44; D04H1/50; D04H1/541; D04H1/5412; D04H1/5418; D04H1/544; D04H1/56; D04H1/70; D04H1/72; D21; D21H; D21H15/00; D21H15/02; D21H15/10; D04H1/5414; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2971; Y10T428/2973; Y10T428/298; Y10T442/00; Y10T442/60; Y10T442/637; Y10T442/641; Y10T442/696
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
93 words
A thermobondable, hydrophilic bicomponent synthetic fiber for use in the blending of fluff pulp, comprising an inner core component and an outer sheath component, wherein (1) the core component comprises a polyolefin or a polyester, (2) the sheath component comprises a polyolefin, and (3) the core component has a higher melting point than the sheath component, wherein the fiber is permanently substantially hydrophilic due to the incorporation into the sheath component of a surface active agent and wherein said fiber has a length of 3-24 mm and a fineness of about 1-7 dtex.
Claim 2
Dependent Claim
93 words
A thermobondable, hydrophilic bicomponent synthetic fiber for use in the blending of fluff pulp, comprising an inner core component and an outer sheath component, wherein (1) the core component comprises a polyolefin or a polyester, (2) the sheath component comprises a polyolefin, and (3) the core component has a higher melting point than the sheath component, wherein the fiber is permanently substantially hydrophilic due to the incorporation into the sheath component of a surface active agent and wherein said fiber has a length of 3-24 mm and a fineness of about 1-7 dtex.
Claim 3
Dependent Claim
15 words
The bicomponent synthetic fiber according to claim 1 which has a length of 5-20 mm.
Claim 4
Dependent Claim
15 words
The bicomponent synthetic fiber according to claim 2 which has a length of 6-18 mm.
Claim 5
Dependent Claim
16 words
The bicomponent synthetic fiber according to claim 3 which has a length of about 6 mm.
Claim 6
Dependent Claim
16 words
The bicomponent synthetic fiber according to claim 3 which has a length of about 12 mm.
Claim 7
Dependent Claim
34 words
The bicomponent synthetic fiber according to claim 1 wherein the surface active agent has been incorporated into the sheath component in the amount of about 0.1-5%, based on the total weight of the fiber.
Claim 8
Dependent Claim
32 words
The bicomponent synthetic fiber according to claim 1 wherein the melting point of the core component is at least 150° C. and that of the sheath component is 140° C. or lower.
Claim 9
Dependent Claim
32 words
The bicomponent synthetic fiber according to claim 1 wherein the melting point of the core component is at least 210° C. and that of the sheath component is 170° C. or lower.
Claim 10
Dependent Claim
37 words
The bicomponent synthetic fiber according to claim 1 wherein the sheath component polyolefin is selected from the group consisting of high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, poly(1-butene) and copolymers and mixtures thereof.
Claim 11
Dependent Claim
41 words
The bicomponent synthetic fiber according to claim 1 wherein the core component comprises a polyolefin selected from the group consisting of polypropylene and poly(4-methyl-1-pentene), or a polyester selected from the group consisting of poly(ethylene-terephtalate), poly(butylene-terephtalate), poly(1,4-cyclohexylene-dimethylene-terephtalate), and copolymers and mixtures thereof.
Claim 12
Dependent Claim
59 words
The bicomponent synthetic fiber according to claim 1 wherein the core (a) and sheath (b) components, respectively, comprise: (1) (a) polypropylene and (b) high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, or poly(1-butene); or (2) (a) poly(4-methyl-1-pentene) or a polyester and (b) polypropylene, high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, or poly(1-butene).
Claim 13
Dependent Claim
22 words
The bicomponent synthetic fiber according to claim 1 which has been texturized to a level of from about 0 to 10 crimps/cm.
Claim 14
Dependent Claim
122 words
A process for producing thermobondable, hydrophilic sheath-and-core type bicomponent synthetic fibers for use in the blending of fluff pulp, the fibers having a sheath component comprising a polyolefin and a core component comprising a polyolefin or a polyester, the core component having a higher melting point than the sheath component, and having a fineness of about 1-7 dtex, comprising (1) melting the constituents of the core and sheath components, (2) incorporating a surface active agent into the sheath component, (3) spinning the low melting sheath component and the high melting core component into a spun bundle of bicomponent filaments, (4) stretching the bundle of filaments, (5) drying and fixing the fibers, and (6) cutting the fibers to a length of 3-24 mm.
Claim 15
Dependent Claim
122 words
A process for producing thermobondable, hydrophilic sheath-and-core type bicomponent synthetic fibers for use in the blending of fluff pulp, the fibers having a sheath component comprising a polyolefin and a core component comprising a polyolefin or a polyester, the core component having a higher melting point than the sheath component, and having a fineness of about 1-7 dtex, comprising (1) melting the constituents of the core and sheath components, (2) incorporating a surface active agent into the sheath component, (3) spinning the low melting sheath component and the high melting core component into a spun bundle of bicomponent filaments, (4) stretching the bundle of filaments, (5) drying and fixing the fibers, and (6) cutting the fibers to a length of 3-24 mm.
Claim 16
Dependent Claim
17 words
The process according to claim 13 wherein the fibers are cut to a length of 5-20 mm.
Claim 17
Dependent Claim
17 words
The process according to claim 14 wherein the fibers are cut to a length of 6-18 mm.
Claim 18
Dependent Claim
18 words
The process according to claim 15 wherein the fibers are cut to a length of about 6 mm.
Claim 19
Dependent Claim
18 words
The process according to claim 15 wherein the fibers are cut to a length of about 12 mm.
Claim 20
Dependent Claim
23 words
The process according to claim 13 wherein the surface active agent is incorporated into the sheath component in the amount of about 0.1-5%.
Claim 21
Dependent Claim
30 words
The process according to claim 13 wherein the melting point of the core component is at least 150° C. and that of the sheath component is 140° C. or lower.
Claim 22
Dependent Claim
30 words
The process according to claim 13 wherein the melting point of the core component is at least 210° C. and that of the sheath component is 170° C. or lower.
Claim 23
Dependent Claim
35 words
The process according to claim 13 wherein the sheath component polyolefin is selected from the group consisting of high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, poly(1-butene), and copolymers and mixtures thereof.
Claim 24
Dependent Claim
39 words
The process according to claim 13 wherein the core component comprises a polyolefin selected from the group consisting of polypropylene and poly(4-methyl-1-pentene), or a polyester selected from the group consisting of poly(ethylene-terephtalate), poly(butylene-terephtalate), poly(1,4-cyclohexylene-dimethylene-terephtalate), and copolymers and mixtures thereof.
Claim 25
Dependent Claim
58 words
The process according to claim 13 wherein the core (a) and sheath (b) components, respectively, comprise: (1) (a) polypropylene and (b) high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, or poly(1-butene); or (2) (a) poly(4-methyl-1-pentene) or a polyester and (b) either polypropylene, high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene or poly(1-butene).
Claim 26
Dependent Claim
13 words
The process according to claim 13 wherein the stretch ratio is about 2.5:1-4.5:1.
Claim 27
Dependent Claim
18 words
The process according to claim 13 wherein the fibers are texturized to a level of about 0-10 crimps/cm.
Claim 28
Dependent Claim
30 words
The bicomponent synthetic fiber of claim 6, wherein the surface active agent has been incorporated into the sheath in the amount of about 0.5-2% based on total weight of fiber.
Claim 29
Dependent Claim
14 words
The bicomponent synthetic fiber of claim 1, with a fineness of about 1.5-5 dtex.
Claim 30
Dependent Claim
14 words
The bicomponent synthetic fiber of claim 1, with a fineness of about 1.7-3.3 dtex.
Claim 31
Dependent Claim
14 words
The bicomponent synthetic fiber of claim 1, with a fineness of about 1.7-2.2 dtex.
Claim 32
Dependent Claim
22 words
The bicomponent synthetic fiber according to claim 1 which has been texturized to a level of from about 0 to 4 crimps/cm.
Claim 33
Dependent Claim
18 words
The bicomponent synthetic fiber of claim 1, wherein the surface active agent is an emulsifier, surfactant, or detergent.
Claim 34
Dependent Claim
44 words
The bicomponent synthetic fiber of claim 31, wherein the surface active agent is selected from the group consisting of a fatty acid ester of glycerol, a fatty acid amide, a polyglycol ester, a polyethoxylated amide, a nonionic surfactant, a cationic surfactant, and blends thereof.
Claim 35
Dependent Claim
16 words
The process of claim 13, wherein the surface active agent is an emulsifier, surfactant, or detergent.
Claim 36
Dependent Claim
42 words
The process of claim 33, wherein the surface active agent is selected from the group consisting of a fatty acid ester of glycerol, a fatty acid amide, a polyglycol ester, a polyethoxylated amide, a nonionic surfactant, a cationic surfactant, and blends thereof.
Claim 37
Dependent Claim
27 words
The process of claim 18, wherein the surface active agent is incorporated into the sheath in an amount of 0.5-2% based on the total weight of fiber.
Claim 38
Dependent Claim
12 words
The process of claim 24, wherein the stretch ratio is about 3.0:1-4.0:1.
Claim 39
Dependent Claim
17 words
The process of claim 1, wherein the fibers are stretched to a fineness of about 1.5-5 dtex.
Claim 40
Dependent Claim
17 words
The process of claim 37, wherein the fibers are stretched to a fineness of about 1.7-3.3 dtex.
Claim 41
Dependent Claim
17 words
The process of claim 38, wherein the fibers are stretched to a fineness of about 1.7-2.2 dtex.
Claim 42
Dependent Claim
17 words
The process of claim 25, wherein the fibers are texturized to a level of about 0-4 crimps/cm.
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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) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |