US5120888A
Expired / Lapsed
US
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Surface-segregatable, melt-extrudable thermoplastic composition
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1991-06-25
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Granted: 1992-06-09
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Expires: 2011-06-25
Abstract
Abstract A surface-segregatable, melt-extrudable thermoplastic composition suitable for processing by melt extrusion to form a fiber or film having a differential, increasing concentration of an additive from the center of the fiber or film to the surface thereof, which differential, increasing concentration imparts to the surface of the fiber or film at least one desired characteristic which otherwise would not be present, which composition includes at least one thermoplastic polymer and at least one defined additive. During formation of the fiber or film, the additive rapidly segregates in a controllable manner toward the newly-formed surface of the fiber or film, thereby resulting in a controllable differential concentration of the polymeric material, which concentration increases with increasing distance from the center of the fiber or film to its surface. The weight ratio of the polymer to the additive is in the range of from about 1 to about 1,000. The preferred polymer is a polyolefin such as polyethylene and polypropylene. The thermoplastic composition is useful in the preparation of fibers or films which have at least one surface characteristic which is different from that of the polymer component of the thermoplastic composition. The thermoplastic composition is particularly useful in the formation of nonwoven webs which are used in the construction of such disposable absorbent products as diapers, feminine care products, incontinence products, and the like.
Inventors
- 👤 Ronald S. Nohr
- 👤 J. Gavin MacDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:49
CPC Classifications
C; C08; C08L; C08L101/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; C08J; C08J5/00; C08J5/18; C08K; C08K5/00; C08K5/0008; C08K5/54; C08K5/541; C08K5/5415; C08K5/5419; C08L23/00; C08L23/02; C08L83/00; C08L83/04; D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/18; C08G77/22; C08G77/26; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
A fiber or film made from a surface-segregatable, melt-extrudable thermoplastic composition which comprises at least one thermoplastic polymer and at least one additive having at least two moieties, A and B, in which: (A) said additive is compatible with said polymer at melt extrusion temperatures but is incompatible at temperatures below melt extrusion temperatures, but each of moiety A and moiety B, if present as separate compounds, would be incompatible with said polymer at melt extrusion temperatures and at temperatures below melt extrusion temperatures; (B) moiety B has at least one functional group which imparts to said additive at least one desired characteristic; (C) the molecular weight of said additive is in the range of from about 400 to about 15,000; and (D) the weight ratio of said polymer to said additive is in the range of from about 1 to about 1,000; with the proviso that said additive cannot be a compound having the general formula, ##STR29## in which each R independently is a monovalent alkyl group; R 1 is a monovalent organic group containing at least one ethyleneoxy group, vicinal epoxy group, or amino group; and a and b, which can be the same or different, each has a value of at least 1.
Claim 2
Dependent Claim
206 words
A fiber or film made from a surface-segregatable, melt-extrudable thermoplastic composition which comprises at least one thermoplastic polymer and at least one additive having at least two moieties, A and B, in which: (A) said additive is compatible with said polymer at melt extrusion temperatures but is incompatible at temperatures below melt extrusion temperatures, but each of moiety A and moiety B, if present as separate compounds, would be incompatible with said polymer at melt extrusion temperatures and at temperatures below melt extrusion temperatures; (B) moiety B has at least one functional group which imparts to said additive at least one desired characteristic; (C) the molecular weight of said additive is in the range of from about 400 to about 15,000; and (D) the weight ratio of said polymer to said additive is in the range of from about 1 to about 1,000; with the proviso that said additive cannot be a compound having the general formula, ##STR29## in which each R independently is a monovalent alkyl group; R 1 is a monovalent organic group containing at least one ethyleneoxy group, vicinal epoxy group, or amino group; and a and b, which can be the same or different, each has a value of at least 1.
Claim 3
Dependent Claim
206 words
A nonwoven web comprising fibers made from a surface-segregatable, melt-extrudable thermoplastic composition which comprises at least one thermoplastic polymer and at least one additive having at least two moieties, A and B, in which: (A) said additive is compatible with said polymer at melt extrusion temperatures but is incompatible at temperatures below melt extrusion temperatures, but each of moiety A and moiety B, if present as separate compounds, would be incompatible with said polymer at melt extrusion temperatures and at temperatures below melt extrusion temperatures; (B) moiety B has at least one functional group which imparts to said additive at least one desired characteristic; (C) the molecular weight of said additive is in the range of from about 400 to about 15,000; and (D) the weight ratio of said polymer to said additive is in the range of from about 1 to about 1,000; with the proviso that said additive cannot be a compound having the general formula, ##STR30## in which each RT independently is a monovalent alkyl group; R 1 is a monovalent organic group at least one ethyleneoxy group, vicinal epoxy group, or amino group; and a and b, which can be the same or different, each has a valve of at least 1.
Claim 4
Dependent Claim
206 words
A nonwoven web comprising fibers made from a surface-segregatable, melt-extrudable thermoplastic composition which comprises at least one thermoplastic polymer and at least one additive having at least two moieties, A and B, in which: (A) said additive is compatible with said polymer at melt extrusion temperatures but is incompatible at temperatures below melt extrusion temperatures, but each of moiety A and moiety B, if present as separate compounds, would be incompatible with said polymer at melt extrusion temperatures and at temperatures below melt extrusion temperatures; (B) moiety B has at least one functional group which imparts to said additive at least one desired characteristic; (C) the molecular weight of said additive is in the range of from about 400 to about 15,000; and (D) the weight ratio of said polymer to said additive is in the range of from about 1 to about 1,000; with the proviso that said additive cannot be a compound having the general formula, ##STR30## in which each RT independently is a monovalent alkyl group; R 1 is a monovalent organic group at least one ethyleneoxy group, vicinal epoxy group, or amino group; and a and b, which can be the same or different, each has a valve of at least 1.
Claim 5
Dependent Claim
38 words
The nonwoven web of claim 2, in which the at least one additive migrated upon formation of the fibers by melt extrusion primarily to at least one of the effective surface and the interfacial surface of the fibers.
Claim 6
Dependent Claim
16 words
The nonwoven web of claim 3, in which a characteristic of said moiety B is hydrophilicity.
Claim 7
Dependent Claim
29 words
The nonwoven web of claim 2, in which the at least one additive migrated upon formation of the fibers by melt extrusion primarily to the subsurface of the fibers.
Claim 8
Dependent Claim
16 words
The nonwoven web of claim 5, in which a characteristic of said moiety B is hydrophilicity.
Claim 9
Dependent Claim
17 words
A disposable absorbent product, at least one component of which is the nonwoven web of claim 2.
References Cited (Backward Citations)
US3360421A
Cited
US3629308A
Cited
US3766115A
Cited
US3929509A
Cited
US3867188A
Cited
CA1049682A
Cited
US3973068A
Cited
US4070218A
Cited
US4150013A
Cited
US4105569A
Cited
US4480009A
Cited
US4499149A
Cited
US4426203A
Cited
EP0071349A2
Cited
US4444563A
Cited
US4563190A
Cited
USRE32514E
Cited
EP0124347A1
Cited
US4698388A
Cited
US4500659A
Cited
US4446090A
Cited
EP0152883A2
Cited
US4578414A
Cited
US4672005A
Cited
US4535113A
Cited
US4652489A
Cited
US4645691A
Cited
US4585830A
Cited
US4659777A
Cited
US4923914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |