CN1449463A

CN1449463A - Fabrics having modified surface properties

Info

Publication number: CN1449463A
Application number: CN01813773A
Authority: CN
Inventors: B·D·海内斯; R·B·奎恩茨三世; D·F·克拉克; M·B·拉克
Original assignee: Kimberly Clark Worldwide Inc
Current assignee: Kimberly Clark Worldwide Inc; Kimberly Clark Corp
Priority date: 2000-07-31
Filing date: 2001-07-31
Publication date: 2003-10-15
Also published as: EP1307612A2; MXPA03000469A; JP2004505180A; ZA200210205B; WO2002009491A2; AU2001279092A1; KR20030022344A; BR0112808A; WO2002009491A3

Abstract

Multicomponent fiber nonwoven webs having excellent liquid handling and/or repellency properties are described wherein the multicomponent thermoplastic polymer fibers have exposed first and second components that form the outer surface of the multicomponent fibers and that extend substantially continuously along the length of the fibers. The first component comprises a thermoplastic polymer and an active agent, such as a liquid repellency agent, and the second component comprises a thermoplastic polymer and contains from 100% to 50% by weight less active agent than the first component.

Description

Fabric with modified surface properties

Technical field

The present invention relates to a kind of fabric with modified surface properties, relate in particular to a kind of have improved impervious and/or scold the fabric of fluidity.

Background technology

As everyone knows, in the prior art by in fabric, using the physical characteristic that one or more chemical constituents just can change fabric.As several examples, up to the present, in order to improve and/or to increase the following characteristic of fabric: intensity, wettability, absorbability, antistatic behaviour (static decay), anti-flammability is scolded alcohol or the like, handles fabric with the different chemical component.Usually, use chemical constituent to change the fiber surface characteristic of fabric by this way.In this, to be applied to whole fabric thickness be desirable to chemical constituent.By applied chemistry component in such a way, just can increase required physical characteristic to whole fabric rather than only be increased to the outside of fabric.This can improve required physical characteristic of processed fabric and/or treatment effeciency greatly.Yet, be difficult in the unified Local treatment of using on whole thickness and/or the good fiber matrix.The method of existing topical application chemical constituent usually can not provide a kind of chemical constituent is applied to method on the whole fabric thickness with a kind of effective, economic mode unification.

For example, up to the present, to fabric one surface, use vacuum then and activating agent is applied on the fabric to another surface of fabric by first applied chemistry component.The purpose of using vacuum gravitation is to help activating agent to immerse fabric and at the inter-process fiber of fabric.The mode by example only at people's such as Gregorian U.S. Patent application No.4, has been described the local coated fiber surface that has chemical constituent in 266,976 and people's such as Pauls U.S. Patent application No.4,385,954.The another kind of method that has the activating agent fabric of handling is by large stretch of infiltration fully.A kind of the method is the method for " soaking " and " extruding ", promptly at first fabric is immersed in the activating agent fully, and fabric has passed a secondary compression roller of " extruding " or the effect of compacting fabric to remove excessive activating agent then.European patent No.0472942 has put down in writing this and other similar approach.Yet, from fabric, remove a large amount of chemical group branches usually and cause the unfavorable waste of this process.In addition, for the fabric of tight formation and/or thicker fabric, this process usually can not be made the unified fiber web of handling and also reduce the required physical characteristic of fabric.Say that further this process also leaves excessive handled thing on the outer surface that contains many chemical constituent fabrics, this handled thing can make chemical constituent transfer to adjacently situated surfaces and make fabric that a kind of cunning sensation be arranged.This is very unfavorable to the fabric that will be touched and/or use as the commodity of pressing close to skin.And so non-consistent processing may need the higher activating agent of concentration to obtain required physical characteristic.

Except the Local treatment of fiber, contain surfactant and other activating agent in the polymer of processing being melted.The mode by example only, U.S. Patent No. 3,973,068 and the No.4 of Weber, 070,218 has instructed a kind of method: earlier surfactant and mixed with polymers, follow the melt-processed mixture to form required fabric.Handle fabric then to force activating agent to the surface of fiber.This usually finishes by the fiber web that heats on a series of warm-up mills, and this is commonly referred to as and is " frosting ".For another example, people's such as Sawyer U.S. Patent No. 4,578,414 has been put down in writing the mixture of being made up of polyolefin and one or more surfactants and has been formed wettable polymerization of olefines fibres.Make the fiber surface frosting according to the record surfactant, have at least a kind of surfactant to keep in the local embedded polymer thing matrix at fiber surface.In this respect, can better control wettable persistence by components of additives and concentration.Further again, people's such as Nohr U.S. Patent No. 4,923,914 instructed a kind of be adapted to pass through melt body extrude processing with form fiber or film surperficial separable, melt the thermoplastic component that body is extruded, has additive concentration difference, that increase from this fiber of center to face or film, concentration difference, that increase has increased fiber surface desirable characteristics (for example hydrophily), especially as example in the Nohr patent, provide and used various polysiloxanes to improve wettable polyamide fiber nonwoven web.

Knowing in the prior art simultaneously in order to the whole bag of tricks that improves or change the polymer fiber surface characteristic, people constantly require to provide can be more effective and/or economical produced fabric with required physical characteristic.Be intended to be used for the commodity doing or sell at product, rag for example, assimilate, medical textile, places such as individual health care product, especially like this.

Summary of the invention

Nonwoven among the present invention has satisfied above-mentioned needs and/or has overcome shortcoming of the prior art, described nonwoven comprises the multi-component thermoplastic poly condensating fiber net that has a kind of component A and a kind of B component at least, described component A and B are arranged in the zones of different of fiber cross section and along fibre length and extend continuously, and wherein component A and B component respectively have the expose portion that forms the multicomponent fibre outer surface.The part of expose portion or component A comprises 25% of fiber outer surface at least.In addition, component A comprises thermoplastic polymer and activating agent and on the expose portion of component A activating agent is arranged.B component comprises the thermoplastic polymer and contains by weight the activating agent of component A low from 50% to 100%.On the other hand, component A comprises about 50% of multicomponent fibre outer surface at least.As the example that is fit to cross-sectional structure, component A can be included as at least that one or more B component separate two is component independently.More advance on the one hand, suitable multicomponent fibre has less than about 25 microns fiber diameter, and more desirable is that fiber diameter is less than about 10 microns.As an example, activating agent comprises wetting agent or scolds liquor.In addition, the single or continuous exposed portions of B component is preferably less than about 35% of multicomponent fibre outer surface.More advance on the one hand, B component preferably by volume be included at least the fibre section long-pending about 45%.And can provide and have the nonwoven that fluidity is oozed and/or scolded to good resistance, wherein activating agent comprises that liquid repels each other agent and multicomponent fibre DENIER mean value approximately less than 1.Activating agent can be by weight also can have basis weights less than about 50 gram/rice 2 less than multicomponent fibre 0.75% and nonwoven web.Although have low relatively basis weights, this nonwoven can have one 50 or bigger scold the alcohol rate.

Brief Description Of Drawings

Fig. 1 shows and is suitable for the multicomponent fibre cross section that the present invention uses, and has polymeric component A and B in list structure.

Fig. 2 shows and is suitable for the multicomponent fibre cross section that this invention is used, and has polymeric component A and B in wedge structure.

Fig. 3 shows and is suitable for the multicomponent fibre cross section that this invention is used, and polymeric component A and B are arranged in the structure of the part of many wedge like, and the part of described wedge like is that the core separation of adjutage forms by having radially.

Fig. 4 is the partial sectional view of multi-layer nonwoven laminate, described multi-layer nonwoven laminate merged comprise multicomponent fibre melt the spray fiber web.

Definition

Here with claim in, " comprising " word is that comprise or open and does not get rid of other composition of not enumerating, composition or method step. Therefore, " comprise " that a word contains more determiner " basically consist of " and " formation ".

Unless all percentages used herein, ratio and ratio have other special appointment all to refer to calculate by weight.

" activating agent " used herein speech refers to any compound and chemical mixture, and described compound and chemical mixture increase or improve a kind of physical characteristic or the functional characteristic of fiber surface at least.

" wetting agent " used herein speech instigates fiber surface to present any compound or the chemical mixture of the water-wet behavior of rising, and this can realize by the contact angle of the aqueous fluid that reduces to contact with fiber surface.

" liquid-impervious agent " used herein instigates the relative particular fluid of fiber surface to present any compound or the chemical mixture of the obstruction or the repellency of increase, and this can realize by the contact angle that increases the particular fluid that contacts with fiber surface.

" fabric " used herein speech meaning is meant that a kind of material comprises fiber mesh material, and described fiber mesh material includes but not limited to material, nonwoven web of material, tufting or similar tufting that weave or braiding or the like.

" non-woven " thing used herein or the fiber web meaning is the net that has the structure of the individual fibers that interweaves or line, but is not with braided fabric or the such mode of textiles.Many technologies can form nonwoven or net, for example melt spray method, spun-bond process, water acupuncture manipulation, air lay and bonding carded web method.

" polymer " used herein speech generally includes but is not limited to homopolymers, copolymer, for example block copolymer, graft copolymer, random copolymer, alternate copolymer, terpolymer etc. and also comprise their mixture and modifier.And unless other special qualification, " polymer " speech comprises all possible geometry or helical molecular structure.This structure is including but not limited to isotaxy symmetry, syndiotaxy symmetry and random (upright structure) symmetry.

" medical textile " used herein speech meaning is the product at medical treatment, as surgery with unlined long gown and curtain, face shield, bulk cap, surgery with calot and pocket emit, clothes, jump suit, apron and the jacket of shoes, cover, slippers, patient's clothes, bandage, sterilization coat, rag, similar laboratory coat, invalid etc.

" individual health care product " used herein speech meaning is the product at personal hygiene, as rag, (baby) diaper, sport pants, moisture absorption underpants, adult's gatism product, feminine hygiene or the like.

" protective cover " used herein speech meaning is a kind of cover that is used on the vehicle, is used for cover, floor covering on outdoor equipment and furniture, place and the garden furniture, tablecloth, tent, WATERPROOF FABRIC etc.

Detailed description of the present invention

Fabric of the present invention comprises the amalgamation layer or the thin slice of multicomponent fibre, and described multicomponent fibre has two kinds of components at least and wherein is positioned at the surface characteristic that activating agent in the part component has changed its fiber." multicomponent " speech is meant the fiber that is formed by two kinds of polymer flows at least and form cell fiber through extruding.The single component of multicomponent fibre is arranged in the zones of different of fiber cross section, and described cross section extends continuously along fibre length basically.The cross-sectional structure of multicomponent fibre has two kinds of different components at least, and described component comprises the fiber outer surface part.Preferablely be that multicomponent fibre has three, four or more form the expose portion of fiber outer surface.From above drawing, the various piece of single polymeric component has constituted the outer surface of multicomponent fibre jointly.Multicomponent fibre comprises first and second components at least, wherein the activating agent that contains less than first component significantly of the activating agent that contains of second component.Preferably second component contains the activating agent that hangs down about 50% (weight ratio) than first component at least, and preferable is that second component contains the activating agent than first component low at least about 75%, further again, second component can contain the activating agent than first component low about 95%.Again on the one hand, second component can contain the activating agent than first component low 100%, does not promptly contain activating agent in second component.

As a specific example and with reference to Fig. 1, the single component of fiber is pressed layout strip, arranged side by side and is arranged, and wherein component A and B adjoin and each component accounts for a part of fiber outer surface or outer surface at least mutually.As another example and with reference to Fig. 2, comprise that " wedge shape " or " cheese " structure that replaces wedge-like portion A and B also is fit to use related to the present invention.Example and with reference to Fig. 3 for another example, the center B component is divided into mass part with component A, and described center B component is radial extension along arm and ball.When only using two kinds of polymers compositionss to form the individual components of multicomponent fibre, the ratio of polymers compositions A and B (volume ratio) is set in from about 90/10 in about 10/90 scope, and better in the scope between about 75/25 and about 25/75.About 50/50 ratio usually especially caters to the need, but employed concrete ratio changes because of needs.

In addition, the individual components of multicomponent fibre is placed in the cross section so that has the component that on a small quantity or does not contain inner activating agent and only comprises about 70% of fiber outer surface or outer surface.The component that contains more activating agent preferably includes more than 30% of fiber outer surface, and more desirable be comprise at least the fiber outer surface about 50% and comprise the fiber outer surface about 55% to 85% between.In addition, improve impervious and/or scold the fabric of fluidity for having, desirable is contains the expose portion that on a small quantity or does not contain inner active agent component and can not form single or continuous part more than fiber outer surface about 35%, and more desirable is to form the single or continuous part that extends beyond fiber outer surface about 25%.As object lesson, with reference to the strip cross-sectional structure of describing among Fig. 1, B component can comprise that the expose portion of about 50% and two separation of fiber volume includes about 10-15% of multicomponent fibre outer surface.As another example, with reference to Fig. 2, the expose portion of B component can comprise the about 50% of multicomponent fibre outer surface altogether, and each expose portion or section only comprise about 12.5% of fiber outer surface.

Desirable is fiber less than about 4 DENIER (restraining/9000 meters) and more desirable be less than 1 DENIER, preferably less than about 0.5 DENIER.On the other hand, the fiber cross section diameter on average be lower than about 25 microns and desirable be the fiber cross section diameter on average between about 0.5 micron to about 10 microns, more desirable is that the fiber cross section diameter is on average between about 1 micron to about 5 microns.Here, the fiber average-size is by its cross section maximum fiber diameter decision.Gratifying is when fiber is made with single circular configuration usually, and multicomponent fibre of the present invention also has other various fiber shapes except for example having hollow, leafy shape or straight shape (promptly banded) fiber.

The component that constitutes fiber can comprise the polymer of one or more melting process.Single component can comprise polymer same, similar and/or inequality.Yet,, be different so have two kinds in the single component at least owing to contain elite and activating agents that quantity is different in the single polymer.Preferably choose the polymeric component of multicomponent fibre from thermoplastic polymer, described thermoplastic polymer includes but not limited to polyolefin (being polypropylene and polyethylene), condensation polymer (being polyamide, polyester, Merlon and polyarylate), polyalcohol, polydiene, polyurethanes, polyethers, polyacrylate, polyacetals, polyimides, cellulose esters, polystyrene etc.As specific example, polymeric component can comprise polyethylene, polypropylene, poly-(1-butylene), poly-(2-butylene), poly-(1-amylene), poly-(2-amylene), poly-(1-Methyl-1-pentene), poly-(3-Methyl-1-pentene) and poly-(4-methyl-1-pentene) etc.In addition, above-mentioned mixture of polymers and/or copolymer are equally applicable to one or more components of multicomponent fibre.The individual components or the part that constitute multicomponent fibre can contain identical or different polymer.Only by the mode of example, the combination of required polymer moieties can comprise polyolefin/polyamide; Polyolefin/polyester; Polyolefin/polyolefin etc.Especially, the example of the polymeric component combination of Shi Yonging includes but not limited to polypropylene, polyethylene, polypropylene/polypropylene, polyethylene/nylon, polyethylene/polyester etc.As an example and with reference to Fig. 1 and 2, component A can comprise the mixture of acrylic polymers and activating agent; B component can comprise acrylic polymers.As another example, component A can comprise the mixture of activating agent and polypropylene and polybutene; B component can comprise polypropylene.Further again, component A can comprise activating agent and polypropylene; B component can comprise the mixture of polypropylene and polybutene.Typical polypropylene includes but not limited in U.S. Patent No. 5,204 with the mixture of polybutene, those that put down in writing in 174 and No.5,482,765.

The fiber that constitutes fabric can create by multiple smelting process technology.Usually, by guide simultaneously two or more molten polymer flow so that early than or just when extruding plate or other pressurizing unit and squeeze out polymer polymer flow just combine, multicomponent fibre can form single filament.Polymer is preferably added by the conduit that separates and is extruded plate and keep separation always till squeezing out before.On the other hand, up to and reach when extruding the plate capillary to polymer till, the separation of using the combing roller dish to keep polymer flow.In addition, use the spinning nozzle assembly also can produce multicomponent fibre.Say that normally the spinning nozzle assembly can comprise housing and many distribution plates that stacks mutually, the form that perforate is set simultaneously is to be formed for difference directs polymer component A and the B circulation passage by the spinning nozzle assembly.Distribution plate is the twice of spinning disc or spinning head, and described spinning disc or spinning head usually have is arranged to a row or multi-row perforate.People's such as Ueda U.S. Patent No. 3425091, the U.S. Patent No. 3981650 of Page, people's such as Terakawa U.S. Patent No. 5601851, the U.S. Patent No. 5989004 of Cook, people's such as the U.S. Patent No. 5344297 of Hills and Pike U.S. Patent No. 5382400 has all been put down in writing the method and apparatus that typically is used to make the multicomponent nonwoven web.

Use traditional melt-processed equipment of transforming to form multicomponent fibre can produce fiber of the present invention and/or fabric.Typical fiber forms technology and includes but not limited to melt spray and spunbond technology.Fiber can be continuous fibers or weak point (being staple length) fiber basically.As an example, spray fiber equipment is melted in use can produce fiber of the present invention and fabric.Therefore, can produce multicomponent and melt the spray fibrous nonwoven webs according to melting pressure spray process, described U.S. Patent No. 3849241 of melting pressure spray process people such as for example Butin, people's such as Dodge U.S. Patent No. 5160746, the U.S. Patent No. 4526733 of Lau, people's such as Haynes U.S. Patent No. 5652048, people's such as Fitts U.S. Patent No. 5366793 and V.Wente, E, it is all on the books for the 4364th page of the Naval research experiment report of " manufacturing of ultra-fine organic fiber " that Boone and C.Fluharty close the exercise question write, here by with reference in conjunction with above-mentioned reference in full.When spraying equipment was melted in use, air themperature main or that weaken usually can be higher than the fusing point of each polymer, and described polymer comprises indivedual polymeric components.Yet main and air themperature that weaken can be equal to or less than any one or the multiple melting point polymer that squeezes out.Be suitable for using cold air to form the U.S. Patent application No.08/994 that the detailed description of melting fibroreticulate equipment of spray and method is documented in the people such as Haynes that announced on December 19th, 1997, in 3783, here by with reference to and in conjunction with the full text of this patent.In addition, as previously discussed, use traditional apparatus for melt spinning also the multiple component spunbond nonwoven web can be created.About this point and the mode by example only, people's such as Appel U.S. Patent No. 4340563; People's such as Dorschner U.S. Patent No. 3692618; People's such as Matsuki U.S. Patent No. 3802817; The U.S. Patent No. 3502763 of Hartman; People's such as Dobo U.S. Patent No. 3542615; Spun-bonded fibre nonwoven web and production technology thereof have been put down in writing in people's such as Pike the U.S. Patent No. 5382400; Here by with reference to and in conjunction with the full text of above-mentioned patent.

Select for use the particular active agent that is included in one or more components or medicament increasing or to improve the specific surface characteristic of fiber as required, and thereby change the characteristic of producing fabric.So far, used various activating agents or chemical mixture to increase or to improve various surfaces characteristic, described surface characteristic includes but not limited to absorbability, wettable, antistatic behaviour, microbial resistance, antifungal activity, scolds fluidity (as alcohol or water) etc.About the wettable or the absorbability of particular web, many fabrics only show intrinsic good affinity or water imbibition to specific liquid.As an example, so far, used polyolefin non-woven web to absorb liquid based on oil or hydrocarbon.In this, the non-woven rag person's character of polyolefin is oleophylic and hydrophobic.Therefore, in order to make the polyolefin nonwoven have good wettable or, just need to handle it with certain methods to the absorbability of water or aqueous solution or emulsion.For example, for increase improved wettable melt-processable to fabric therein the typical wetting agent in part include but not limited to ethyoxyl silicone surfactant, the ethyoxyl hydrocarbon surfactant, ethyoxyl fluorocarbon surfactant etc.In addition, people's such as Weber U.S. Patent No. 3973068 and No.4070218 have put down in writing the more hydrophilic chemical substance of thermoplastic fibre that typically makes melt-processed in people's such as Nohr the U.S. Patent No. 5696191; Here by with reference to and in conjunction with the full text of above-mentioned patent.

On the other hand, the raising fabric is desirable to the impermeability or the repellency of particular fluid.As an example, usually preferably in control infectious disease product and medical dress ornament, use water and alcohol are had the fabric that good resistance blends repellency.In this, by before extruding the chemical mixture with required repellency mixed with the thermoplastic polymerization resin, after this melt-processed mixture enters one or more parts, has just increased the ability that thermoplastic fibre better repels alcohol.Thereby activating agent is transferred to the surface of polymeric component and is changed its surface characteristic.In addition, believe that distance between the component that is exposed on the fiber outer surface that contains remarkable concentration activating agent or gap are enough little and allow activating agent to change whole fiber functional characteristic and therefore obtain having the fabric of desirable characteristics.Be suitable in melt extrusion processes, using and improving and scold alcoholic chemical mixture to include but not limited to fluorochemical.The liquor of scolding that typically can be used for smelting process comprises that those trade names that can obtain from DuPont company are the fluorochemical of Z0YL, and comprises that also the commercial title that can obtain from 3M company is those of FX-1801.People's such as Potts U.S. Patent No. 5145727, people's such as Duchesne U.S. Patent No. 4855360, people's such as Johnson U.S. Patent No. 4863983, people's such as Fitzgerald U.S. Patent No. 5798402 and No.5459188 and No.5025052 have put down in writing and variously have been suitable for making thermoplastic fibre to have scolding alcoholic activating agent; Here by with reference to and in conjunction with the full text of above-mentioned patent.Except scolding alcohol, chemical mixture can be used to improve repulsion or the impermeability to the low liquid of other surface tension.

Active agent content that desirable is is about 5% less than the multicomponent fibre total amount, more desirable is the multicomponent fibre total amount about 0.1% to about 3% between, be preferably in the multicomponent fibre total amount about 0.2% to about 2% between.When the activating agent of processing in one or more components, activating agent and polymer push out with the form of mixture, wherein activating agent comprise extrudate weight about 0.1% to about 5% between, preferable is that the content of activating agent is between about 0.2% to about 1%.On the other hand, can provide to have and well scold alcoholic fabric, wherein multicomponent fibre comprises and is lower than 0.8% the liquor of scolding by weight, preferable be comprise about 0.6% or still less scold liquor.

Can optionally add other material and push, described other material and particular active agent is compatible and do not reduce surfactant properties basically with one or more polymeric components.As an example, one or more unit component of multicomponent fibre optionally comprises other surfactant, dyestuff, stabilizing agent, pigment, spices or the like.

The basis weights of desirable is fabric of the present invention is at about 7 gram/rice ²To about 340 gram/rice ², more desirable is at about 14 gram/rice ²To about 68 gram/rice ²Between.On the other hand, the alcohol rate of scolding of fabric is 30 at least, and desirable is at least about 50, and more desirable is at least about 65.As an example, can provide basis weights at about 14 gram/rice ²To about 50 gram/rice ²Between and scold the alcohol rate to surpass 50 multicomponent to melt the spray fabric.

Fabric of the present invention can use separately or use as the part of sandwich construction.As an example and with reference to Fig. 4, multi-layer nonwoven laminate 20 can be provided, described multi-layer nonwoven laminated product 20 comprises being pressed into like lamellose multicomponent and melts spray fiber web 22 or comprise fabric 24 as the spun-bonded fibre nonwoven web.One specific aspect still with reference to Fig. 4, the composite wafer goods can comprise three layers of laminate 20, melt spray fiber 22 between ground floor spun-bonded fibre net 24 and second layer spun-bonded fibre net 26 as the intermediate layer multicomponent, thereby form the nonwoven web laminate of spray/spunbond (SMS) that weave/melt.In this,, single layer can be mutually combined by one or more modes in the known technology, for example, heat, ultrasonic wave and/or gluing in conjunction with each layer.As an example, but each single layer decorative pattern is bonding, as a combination." point in conjunction with " used herein meaning at many little, binding site places of separating in conjunction with one or more layers fabric, as the binding site of describing among Fig. 4 28.As an example, focus is provided at combined one or more layers between the hot-rolling (as engraved roll or line flower roller) and second roller in conjunction with generally including to make.Engraved roll consequently can not combine fabric on whole surface at processing graphic pattern on the fabric in some way.Second roller can be the light face also can be line flower.Therefore, based on the function and aesthetic reason, developed the pattern on the various engraved rolls.Preferably the composite wafer goods are the bonding so that bonded areas of decorative pattern less than fabric face long-pending 50%, preferable be bonded area fabric face long-pending about 5% to about 30% between.Be suitable for typically including but not limited to of the present invention's use: the U.S. Patent No. 4374888 of Bornslaeger in conjunction with pattern and/or combined process, people's such as Hansen U.S. Patent No. 3855046, people's such as Bourne U.S. Patent No. 5635134 is put down in writing among the PCT application US94/03412 (publication number WO95/09261).

Fabric of the present invention is suitable for various purposes to be used or uses, described purpose use or use include but not limited to as or at medical textile, the individual health care product, protective textile is used in the sorbent, rag etc.In this, fabric of the present invention especially is suitable for the surgery clothes, surgery curtain, the fabric of WATERPROOF FABRIC and other anti-liquid infiltration.

Test

Scold the alcohol rate: scold the alcohol rate to determine by isopropyl alcohol (IPA)/aqueous solution being dripped on the fabric face.Solution can comprise IPA by 5% increment from 20% to 100% water.Along with the increase of IPA concentration in the solution, the surface tension of fabric reduces.Therefore, the higher more difficult repulsion of solution of IPA concentration.Direction along the fabric cross-machine is placed eight each solution, just can obtain the rate of rejection of this fabric after five minutes.Rate of rejection promptly is by the resulting solution of the highest %IPA that has that is not sucked into and permeates fabric in the back side of observing fabric.When a solution soaks into, just think that this fabric does not reach specific level.

Example

In the following example the material that uses produce with melting pressure spray process.One-component fiber and multicomponent fibre all have the solid cross-section of a circle.For multicomponent fibre,, and till before entering extrusion plate capillary inlet, guide each molten polymer flow respectively by extruding panel assembly earlier with the polymerizable compound fusing.The guiding molten polymer flow enters and extrudes the plate purpose is to form the fiber with the cross section A/B/A structure that is similar among Fig. 1, and wherein the B component approximately comprises 50% of fiber cross section.Melt temperature is that 282 ℃ and initial stretching gas temperature also are 282 ℃.Before smelting process, just increase is scolded the activating agent and the mixed with resin of alcohol rate.For the purpose of data of description hereinafter, the alcohol rate of scolding of only using 10% increment (20%, 30%, 40% etc.) to implement fabric is measured.

Example 1: formation has the about 17 gram/rice of basis weights ²And the multicomponent fibre of average diameter between the 3-5 micron melts the blown non-woven fiber web.The A component be a kind of account for by weight 1% scold spirits (commercial title FX-1801 from the obtainable fluorochemical of 3M), 8.3% polybutene (DP-8911, can obtain from Montell) and the mixture of 90.7% polypropylene (3746G can obtain from Exxon chemical company).The B component comprises and accounts for 15% polybutene (DP-8911 can obtain from Montell) greatly and account for 85% polypropylene (3746G can obtain from Exxon chemical company).

Example 2: formation has the about 17 gram/rice of basis weights ²And the multicomponent fibre of average diameter between the 3-5 micron melts the blown non-woven fiber web.The A component be a kind of account for by weight 1% scold spirits (commercial title FX-1801 from the obtainable fluorochemical of 3M), 2.1% pigment, 8.3% polybutene (DP-8911, can obtain from Montell) and the mixture of 88.6% polypropylene (3746G can obtain from Exxon chemical company).The B component comprises and accounts for 0.5% fluorochemical (FX-1801 can obtain from 3M), 2.1% pigment, 8.3% polybutene (DP-8911 can obtain from Montell) and 89.1% polypropylene (3746G can obtain from Exxon chemical company) by weight.

Example 3: formation has the about 17 gram/rice of basis weights ²And the multicomponent fibre of average diameter between the 3-5 micron melts the blown non-woven fiber web.The A component be a kind of account for by weight 1% scold spirits (commercial title FX-1801 from the obtainable fluorochemical of 3M), 2.1% pigment, 8.3% polybutene (DP-8911, can obtain from Montell) and the mixture of 88.6% polypropylene (3746G can obtain from Exxon chemical company).The B component comprises and accounts for 0.25% fluorochemical (FX-1801 can obtain from 3M), 2.1% pigment, 8.3% polybutene (DP-8911 can obtain from Montell) and 89.3% polypropylene (3746G can obtain from Exxon chemical company) by weight.

Example 4: formation has the about 17 gram/rice of basis weights ²And the multicomponent fibre of average diameter between the 3-5 micron melts the blown non-woven fiber web.The A component be a kind of account for by weight 1% scold spirits (commercial title FX-1801 from the obtainable fluorochemical of 3M), 2.1% pigment, 8.3% polybutene (DP-8911, can obtain from Montell) and the mixture of 88.6% polypropylene (3746G can obtain from Exxon chemical company).The B component comprises 2.1% pigment, 8.3% polybutene (DP-8911 can obtain from Montell) and 89.6% polypropylene (3746G can obtain from Exxon chemical company).

Comparative example 1: formation has the about 17 gram/rice of basis weights ²And the multicomponent fibre of average diameter between the 3-5 micron melts the blown non-woven fiber web.Fiber comprises 2.1% pigment, 7.9% polybutene (DP-8911 can obtain from Montell) and 90% polypropylene (3746G can obtain from Exxon chemical company).

Comparative example 2: formation has the about 17 gram/rice of basis weights ²And the multicomponent fibre of average diameter between the 3-5 micron melts the blown non-woven fiber web.Fiber comprise account for by weight 1% scold spirits (commercial title FX-1801 from the obtainable fluorochemical of 3M), 2.1% pigment, 7.9% polybutene (DP-8911, can obtain from Montell) and 89% polypropylene (3746G can obtain from Exxon chemical company).

Having assessed nonwoven web and the handle described in the above-mentioned example the results are shown in the following table 1.

Example	Total fiber FC level (target)	Rate of rejection
		Rate of rejection			0 hour	24 hours	X days
		Comparative example 1	????0	??20	0 hour	24 hours	X days	???20	????20 ??(x＝8)
Comparative example 2	????1.0％	Comparative example 1	????0	??20	??70	???70	????70 ??(x＝43)	???20	????20 ??(x＝8)
Comparative example 2	????1.0％	Example 1	????0.5％	??70	??70	???70	????70 ??(x＝43)	???70	????70 ??(x＝90)
Example 2	????0.75％	Example 1	????0.5％	??70	??70	???70	????70 ??(x＝28)	???70	????70 ??(x＝90)
Example 2	????0.75％	Example 3	????0.63％	??70	??70	???70	????70 ??(x＝28)	???60	????70 ??(x＝28)
Example 4	????0.5％	Example 3	????0.63％	??70	??60	???70	????70 ??(x＝28)	???60	????70 ??(x＝28)

Above example shows: although there is seldom or do not have activating agent in all components that is exposed to the fiber outer surface, still can obtain to provide the fabric with low concentration activating agent of well scolding fluidity.And it is scolded the alcohol rate and comprises that the fabric of the fiber that all is distributed with activating agent in the outer surface all components is suitable.

Though here by with reference to combining various patents and other reference, any inconsistent as if having between the data of combination and this specification, should be as the criterion with this specification.In addition, though describe the present invention in detail, clearly, concerning those those skilled in the art, do not break away from the spirit and scope of the present invention and can make various transformations, change and other variation with reference to example.Therefore claim covers or comprises various transformations, change and variation.

Claims

1. the multicomponent fibre nonwoven web with modified surface properties comprises:

Net with multicomponent thermoplastic polymer fibers of cross section, length and outer surface, described multicomponent fibre has a component A and a B component at least, described component A is arranged in the different zone of fiber cross section with B component and extends continuously basically along fibre length, described component A and B component respectively have the expose portion that forms the multicomponent fibre outer surface, and wherein said component A comprises about 25% of fiber outer surface at least;

Described component A comprises thermoplastic polymer and activating agent, and on the expose portion that forms the multicomponent fibre outer surface part activating agent is arranged; With

Described B component comprises thermoplastic polymer and by weight the activating agent of described component A low 100% to 50%.

2. the described a kind of multicomponent fibre nonwoven web of claim 1, the average DENIER of wherein said multicomponent fibre is less than 4.

3. the described a kind of multicomponent fibre nonwoven web of claim 2, wherein said component A comprise by weight the activating agent less than 5%.

4. the described a kind of multicomponent fibre nonwoven web of claim 2, wherein said B component comprise low 95% the activating agent at least than described component A.

5. the described a kind of multicomponent fibre nonwoven web of claim 2, wherein said activating agent are to choose from comprising wetting agent and scolding the active groups of liquor, and wherein said component A comprises about 50% of multicomponent fibre outer surface at least.

6. the described a kind of multicomponent fibre net of claim 5, wherein said component A comprise by weight the activating agent less than 5%, and wherein said B component comprises than low 75% to 100% activating agent among the described component A.

7. the described a kind of multicomponent fibre net of claim 5, wherein said multicomponent fibre average diameter less than about 10 microns and average DENIER less than 1.

8. the described a kind of multicomponent fibre net of claim 5, wherein said activating agent comprises wetting agent.

9. the described a kind of multicomponent fibre net of claim 8, wherein said nonwoven web comprise the olefin polymer component and have at about 17 gram/rice ²To about 340 gram/rice ²Between basis weights.

10. the described a kind of multicomponent fibre net of claim 1, the average DENIER of wherein said multicomponent fibre be less than about 1, and wherein said B component respectively separate expose portion less than 35% of multicomponent fibre outer surface.

11. the described a kind of multicomponent fibre net of claim 10, wherein said activating agent comprises scolds liquor.

12. the described a kind of multicomponent fibre net of claim 11, wherein said component A comprise two separation components at least and are separated by described B component.

13. the described a kind of multicomponent fibre net of claim 11, wherein said activating agent comprises fluorochemical.

14. comprising, the described a kind of multicomponent fibre net of claim 12, wherein said nonwoven web melt the spray fiber web.

15. the described a kind of multicomponent fibre net of claim 12, wherein said average fibre diameter is less than about 5 microns.

16. the described a kind of multicomponent fibre net of claim 15, wherein said B component by volume comprises about 45% of fiber cross section at least.

17. the described a kind of multicomponent fibre net of claim 15, wherein said activating agent comprises scolds spirits, and wherein said multicomponent fibre nonwoven web scold the alcohol rate at least about 50.

18. the described a kind of multicomponent fibre net of claim 3, wherein said activating agent comprises scolds liquor, and wherein said multicomponent fibre average diameter is less than about 5 microns, and the expose portion of wherein said B component is altogether less than about 50% of multicomponent fibre outer surface.

19. the described a kind of multicomponent fibre net of claim 18, wherein said activating agent be by weight less than 0.75% of described multicomponent fibre, and wherein said nonwoven web has and scolds the alcohol rate less than the basis weights of 50 gram/rice 2 and at least 65.

20. the described a kind of multicomponent fibre net of claim 19, wherein said activating agent comprises fluorochemical.