HU0202695A2 - Low stress relaxation elastomeric materials - Google Patents

Low stress relaxation elastomeric materials Download PDF

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Publication number
HU0202695A2
HU0202695A2 HU0202695A HU0202695A HU0202695A2 HU 0202695 A2 HU0202695 A2 HU 0202695A2 HU 0202695 A HU0202695 A HU 0202695A HU 0202695 A HU0202695 A HU 0202695A HU 0202695 A2 HU0202695 A2 HU 0202695A2
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HU
Hungary
Prior art keywords
surface
elastomeric
web
styrene
film
Prior art date
Application number
HU0202695A
Other languages
Hungarian (hu)
Other versions
HU0202695A3 (en
Inventor
John Joseph Curro
Michele Ann Mansfield
John Jianbin Zhang
Original Assignee
The Procter & Gamble Co.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US39884999A priority Critical
Application filed by The Procter & Gamble Co. filed Critical The Procter & Gamble Co.
Priority to PCT/US2000/024924 priority patent/WO2001019920A1/en
Publication of HU0202695A2 publication Critical patent/HU0202695A2/en
Publication of HU0202695A3 publication Critical patent/HU0202695A3/en

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C08L53/025Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24826Spot bonds connect components
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249978Voids specified as micro
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987With nonvoid component of specified composition
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987With nonvoid component of specified composition
    • Y10T428/249988Of about the same composition as, and adjacent to, the void-containing component
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249953Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987With nonvoid component of specified composition
    • Y10T428/249991Synthetic resin or natural rubbers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/647Including a foamed layer or component
    • Y10T442/651Plural fabric layers

Abstract

The present invention relates to a low-stress elastomeric material comprising a block copolymer, an elastomeric soft particle and a thermoplastic hard core, and the elastomeric material further comprising at least one vinyl arsenic resin and a mineral oil. The elastomeric material can be used in a foil which consists of an elastomeric layer and at least one substantially less elastomeric coating layer. The topsheet is a thermoplastic polymer such as polyolefin. At the film body temperature, it shows the desired elastic and tension reduction properties. The film can be macroscopically porous to form a three-dimensional elastomeric web. HE

Description

EXTRACT

Low-stress elastomeric materials

The present invention relates to a low-stress elastomeric material comprising a block copolymer, consisting of an elastomeric soft block portion and a thermoplastic hard block portion, and the elastomeric material further comprising at least one vinyl arsenic resin and a mineral oil.

The elastomeric material may be used in a film comprising an elastomeric layer and at least one substantially less elastomeric coating layer. The topsheet is a thermoplastic polymer such as polyolefin. The film exhibits the desired elastic and tension reduction properties at body temperature. The film can be macroscopically porous to form a three-dimensional elastomeric web. <- λ

·· ··. z ·· · M f, *. · * '- BE

PUBLISHED

02S. BG & κ.

Patent Attorney's Office H-1062 Budapest, Andrássy'ut 113. Phone: 461-1000, Fax: 461-1099

Low-stress elastomeric materials

FIELD OF THE INVENTION The present invention relates to low tensile elastomeric materials suitable for use in macroscopically expanded (porous) three-dimensional perforated (perforated) polymeric webs.

In disposable (disposable) absorbent articles, it has long been known that it is desirable to make absorbent devices such as disposable diapers with fasteners, pant diapers, padded underpants, sanitary napkins, panty liners, incontinence pants, and the like with elastic elements to improve the size range, facilitate movement, and long-lasting fit. . It is also well known that in particular in products that are intended to be worn in warm and wet conditions, it is advantageous to provide an appropriate hole in each area of the article where undesirable skin obstruction can cause sensitive skin and heat rash. Depending on the nature of many disposable absorbent articles, there is a great potential for skin irritation, moisture and other body exudations, between the elastic portion of the article and the wearer's skin. The elastic parts of disposable articles are particularly prone to cause skin irritation, as they are better suited to the body and therefore block some areas of the skin, often for a long time. Many methods are known in the art for making polymer films flexible. As more flexible materials for health and personal hygiene products provide a better fit to the body, air flow to the skin and • air flow from the obstructed areas is reduced. Breathability (mainly through vapor transmission) is becoming increasingly important for skin health. Various methods are known in the art for creating a hole in the polymer films to improve breathability, but there remains a need for a polymer film or web that provides both sufficient flexibility and porous (puncture) character and can be used for durable, long use. in personal hygiene or health care products, in particular disposable articles, bandages, bandages and dressings.

Disposable diapers and other absorbent articles with elasticized waistband and elasticized waistband, which are more elasticized to provide better fit, are known in the art. Flexibility is often achieved by heat treatment of the polymeric materials, which results in the proper retraction or creasing of a portion of the diaper. Such a method of treatment is described in USP 4,681,580. Other methods that provide flexibility are disclosed in USP 5,143,679, 5,156,793 and 5,167,897.

Several methods are known in the art for making porous planar plimeric films more porous, such as punching with tools, pruning and melt perforation with a hot needle. However, if any of the above methods is applied to thermoplastic elastomer films, the increase in porosity is accompanied by a decrease in reliable elastic performance. For example, in the case of circular apertures, it is well known in a planar film

74346 / BE to an applied stress S 2 Si a local strain is formed in the applied stress at right angles around the openings. This is it

S 2 is a local tension greater than that of the ski, approximating the three times the applied tension. For non-round openings, the tension concentration may be even higher. As a result, the openings become the source of the beginning of the tear spots on their edges, as the edges of the material form the edges of the openings in the plane of the applied tension. In conventional thermoplastic elastic films, these openings facilitate the start of the tear, which may spread over time, leading to a catastrophic defect. When used in flexible parts of disposable absorbent articles, these defects result in the loss of important elastic properties, including the comfort, fit and use of the absorbent article.

The prior art web structures that provide sufficient porosity, and thus preferable to use disposable absorbent articles as the wearer's surface, have two basic variants, i.e. inherently fluid permeable structures, such as fibrous, nonwoven materials, and fluid passage. non-permeable materials, such as polymeric webs, which are provided with a certain amount of fluid permeability through perforation which allows fluid and moisture to flow through the structure. None of the variants is typically flexible, and as a result, both versions are generally used in regions of absorbent articles that require fluid permeability, but not elasticity, such as a menstrual pad contacting the body 74.346 / BE.

USP 3,929,135 proposes a suitable porous polymer web that is in contact with the body for disposable articles. This patent discloses a macroscopically expanded (porous) three-dimensional topsheet consisting of a liquid impermeable polymeric material. However, the polymeric material is designed to contain conical capillaries, the capillaries having a base opening in the plane of the topsheet, and a aperture in close contact with the absorbent insert used in the disposable absorbent article. The polymer material of the above patent is generally not elastomeric and depends on the non-elastic properties of the thermoplastic single-layer film to provide the desired three-dimensional structure.

Another material is disclosed in USP 4,342, 314, which is used as a body-contacting surface in connection with a disposable absorbent article. This patent discloses an improved, macroscopically porous three-dimensional plastic web consisting of a regular continuity of capillary mesh structures that originates on and extends from one surface of the web in the form of openings and ends on the opposite surface of the web. In a preferred embodiment, the capillary mesh structures are descending in the direction of fluid transfer.

The above-described 3,929,135 and 4,342,314 macroscopically porous three-dimensional plastic webs of the type described above have been very successful since they have provided the necessary vapor permeability, provided by the openings.

74.346 / BE due to porosity. However, such webs, due to material constraints, generally do not have the necessary flexibility to allow the fabric produced to have significant elastomeric properties. This deficiency substantially restricts the use of such webs in the flexible portions of the absorbent articles.

Flexible polymeric webs can be produced from elastomeric materials known in the art and can be laminated from polymeric materials as described in USP 5,501,679. Laminates of this type are generally produced by co-extruding elastomeric materials and non-elastic topsheets, and then stretching the laminate beyond the elasticity of the topsheets and then allowing the laminate to regenerate. The elastomeric webs or foils described above can be used in garments around the body, such as waist straps, collar collars and side panels, but are generally not porous enough to prevent unwanted skin irritation if used for a long period of time.

Furthermore, the actual use conditions for absorbent articles or other personal protective equipment typically include heat, moisture, load, or combinations thereof. Some elastomeric materials lose their elastic properties and dimensional stability at body temperature, especially under load or tension. The loss of elastic properties and loss of dimensional stability results in the absorbent article sagging and misalignment and, in severe cases, causing leakage from the absorbent article.

74 346 / BE

Elastic components of some articles, such as lined underpants, diapers, disposable diapers with adult lugs, adult incontinence garments, bandages, bandages, wound dressings, and the like, can be subjected to considerable stretching up to 400% of their original dimension while the article is on the wearer's body placed. This operation requires additional requirements for the elasticity and regeneration of the elastomeric material.

The processing and handling of elastomeric materials is quite difficult due to the inherent adhesion and elongation of the elastomeric materials. The elastomeric materials tend to adhere to the processing equipment and are difficult to remove from the cylinder or cut to the appropriate size to be incorporated into the finished products.

Therefore, it is desirable to produce an elastomeric material that substantially retains its elastic properties under the actual conditions of use of the finished product for a defined period of time, for example at body temperature under sustained loading for about 10 hours.

It is desirable to produce an elastomeric film that fits into the shape and is breathable (i.e., vapor-permeable).

More specifically, in a particularly preferred embodiment, it is desirable to produce a macroscopically porous, three-dimensional, perforated elastomeric web that is substantially capable of regaining its three-dimensional shape after being subjected to an applied tension of about 400% or greater.

It is also desirable to produce an elastomeric film having

74 346 / BE

Ί suitable for use in a perforated elastomeric web, designed to separate the effects of tension applied on the web from the edges of the apertures, thereby delaying or preventing tearing.

It is further desirable to produce an elastomeric material that is more processable and more cost-effective for personal hygiene products and health products such as panty liners, lined pants, disposable diapers with fasteners, incontinence garments, sanitary napkins, panty liners, wound dressings, bandages and bandages.

The present invention relates to a low-stress elastomeric material. The elastomeric material can be used alone or in the form of topcoats to form an elastomeric film. The elastomeric film can be used in molding processes for producing porous macroscopically expanded three-dimensional elastomeric webs. In a preferred embodiment, the elastomeric web is suitable for use in disposable absorbent articles in or around the body, such as side panels, waistbands, thigh collars or health products such as wound dressings, bandages and bandages. The porous, extensible polymer webs of the present invention may also be used in other portions of absorbent articles that require stretchable or breathable material, such as topsheets or backsheets.

Preferably, the elastomeric materials of the present invention exhibit low stress relief at body temperature and under load or stress for a specified period of time. Elastomer materials

74,346 / BE «···«

· · · Also show low hysteresis and high elongation at break when subjected to high deformation. In a preferred embodiment, the composition of the elastomeric material is a styrene block copolymer such as polystyrene poly (ethylene / propylene) polystyrene (S-EP-S), polystyrene poly (ethylene / butylene) polystyrene (S-EB-S) polystyrene-polybutylene-polystyrene (SBS), polystyrene-polyisoprene-polystyrene (SIS) or hydrogenated polystyrene-poly (isoprene / butadiene) polystyrene (S-IB-S); at least one vinyl arena resin; and a processing oil, in particular a low viscosity hydrocarbon oil such as mineral oil.

The elastomeric material of the present invention may be a single-piece film or a multilayer film having at least one substantially less elastomeric coating layer, such as polyolefin-type material, including polyethylene and polypropylene. Elastomeric films can be used to form macroscopically porous, three dimensional elastomeric webs.

In a preferred embodiment, the web has a continuous (continuous) surface and a non-continuous second surface away from the first surface. The elastomeric web has a plurality of primary openings on the first surface of the web, the primary apertures being defined by the interconnected mesh structure of the elements interconnected in the plane of the first surface, each interconnecting member having an upward concave cross-section along its length.

In a preferred embodiment, each connecting element exhibits a general U-shaped cross-section along a portion of its length, the cross section includes a base portion, generally in the plane of the first surface of the web, and the side wall portions are attached to each of the base members. bound to the other side walls. The interconnecting sidewall portions generally extend towards the second surface of the web and are interconnected to act as mediators between the first and second surfaces of the web. The interconnecting side wall portions terminate substantially parallel to one another, forming a second opening in the plane of the second surface of the web.

When used as an extensible porous member in the absorbent article, the elastomeric layer of the present invention allows the engaging elements to extend in the plane of the first surface. The three-dimensional nature of the web allows the elongation (tension) of the connecting elements in the plane of the first surface, separated from the tension of the secondary openings on the second surface, thereby eliminating the potential stress caused by tension at the beginning of the tear. This separation or elimination of the tension-induced stress of the web from the stress-induced use of the secondary openings significantly increases the reliability of the web, allowing the web to be repeatedly and sustainably tensioned up to about 400% or more without the failure of the web due to openings at openings.

Also disclosed is a method for producing the elastomeric web of the present invention by producing a multilayer elastomeric film, supporting the film on a molding structure, and applying a liquid pressure difference through the thickness of the multilayer film. The liquid pressure difference is large enough to fit the multilayer film14.346 / BE ···· ··· «

· «« Hez hez hez hez hez hez hez · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

A brief explanation of the illustrations

Although the description is described in detail in the appended claims and is clearly illustrated by the present invention, it is believed that the invention will become more readily understood by reference to the accompanying drawings, in which the same reference numerals refer to the same elements.

Figure 1 is an enlarged, partially segmented, perspective view of a prior art polymeric web of the type described in USP 4,342,314.

Figure 2 is an enlarged, partially segmented, perspective view of a preferred elastomeric web according to the invention comprising two layers of polymeric film, at least one of which is an elastomer.

Figure 3 is a further enlarged, partial illustration of a web of the type generally shown in Figure 2, but illustrating in more detail the web structure of an alternative elastomeric web according to the invention.

Figure 4 is an enlarged cross-sectional view of a preferred multilayer film of an elastomeric web according to the invention, the elastomeric layer of which is positioned between two top layers.

Fig. 5 is a plan view of the opening forms of the first surface of an alternative elastomeric web according to the invention.

Figure 6 is an enlarged cross-sectional view of the connecting element taken along line 6-6 of Figure 5;

Figure 7 is another view taken along line 7-7 of Figure 5

74.346 / BE • 9

cross-sectional view of connecting element.

Figures 8.A-8.C are schematic representations of a cross-section of an opening of an elastomeric web according to the invention in different states of tension.

Figure 9 is an enlarged optical microfilm showing the first surface of the elastomeric web according to the invention, having an ordered pattern of apertures of about 1 mm 2 .

Fig. 10 is a perspective illustration of an exploded electron microscope micrograph of the second surface of the elastomeric web of Fig. 9, in a non-stretched state.

Figure 11 is a perspective view of an enlarged, electron microscopic micrograph of the second surface of the elastomeric web of Figure 9, stretched about 100%.

Figure 12 is a perspective illustration of an enlarged, electron microscopic microscope image of an opening of an elastomeric web according to the invention showing the folds formed after elongation and regeneration.

Figure 13 is a partially segmented perspective view of a disposable garment comprising an elastomeric web according to the invention.

Figure 14 is a simplified, partially segmented illustration of a preferred embodiment of a side cover of a disposable garment.

Fig. 15 is a simplified, partially exploded perspective view of a laminate structure generally used to form the web structure of Fig. 2.

74.346 / BE

Fig. 16 is a perspective view of a tubular member generally formed by wrapping the planar laminate structure of the type shown in Fig. 15 with the desired radius of curvature and aligning its free ends.

Fig. 17 is a simplified schematic illustration of a preferred method and apparatus for deepening and perforating an elastomeric film according to the invention.

Figure 18 is an enlarged, partially segmented perspective view of an alternative elastomeric web according to the invention.

Figure 19 is an enlarged cross-sectional view of the web of Figure 18 taken along the intersection line 19-19.

As used herein, the term "comprising" means that the various components, additives or operations may be used together in the practice of the invention. Thus, the term "contains" includes more restrictive "stands for something" and "substantially consists of something."

As used herein, the term "elastic or" elastomer refers to a material capable of elongating or deforming under the effect of externally applied force, which substantially retains its original size or shape, retaining only a slight permanent deformation (typically no more than about 20%) of the external after loosening power. The term "elastomer" refers to a material having the elastic properties described above. As used herein, the term "thermoplastic" refers to a material that can melt and solidify again without altering its physical properties or with a slight change (minimal oxidative decomposition under conditions.346 / BE).

As used herein, the term "top coat" refers to a layer consisting of a thermoplastic polymer or polymer blend and substantially less elastomer than the elastomeric layer itself. The topsheet is kept "substantially less elastomer when the permanent deformation of the topsheet is at least about 20% greater than the elastomeric layer. Permanent deformation refers to a deformation of a material, measured with sufficient time after the material is loosened from a specified stretch, which allows the material to be completely retracted.

As used herein, the term "percentage elongation" refers to the difference between the length of an elastomeric material elongated by the applied force and the non-deformed, non-stretched length of the material divided by the length of the non-deformed material and multiplied by 100. For example, in a non-deformed or non-stretched state, a material has a zero% elongation.

The terms "deformation" or "deformation" as used herein refer to the percent deformation of an elastomeric material when the material is in a loose state for a specified period of time (e.g., 60 seconds in the assay methods described herein) after the material is loosened from a specified stretch without to let the material jump back perfectly. Express the percentage deformation as follows: [(zero load elongation after one cycle - distance of the sample measured at the beginning of cycle 1) / (distance of the sample measured at the beginning of cycle 1)] x 100. Zero load elongation refers to the distance the second cycle between the clamping jaws

74.346 / BE at the beginning of «* ··: · ··· ··· ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·?

The term "stress reduction" as used herein refers to a percentage reduction in tension or load, a maximum load or force occurring after the stretching of an elastomeric material at a predetermined length (or a load or force at some initial length) and a residual load. or measured between the length and elongation of the sample for a specified period of time. The loosening is expressed as a percentage reduction of the initial load occurring during the specific stretching of an elastomeric material.

As used herein, the term "hysteresis" refers to the difference between the energy of an elastomeric material retained during retraction from a specific stretch and the energy required to extend the elastomeric material to its previous length. Tensioning an elastomeric material to a specific elongation, typically 200% rabbit

until returning zero load, ad a complete hysterical
terézishurkot.
The other terms there we define where first described
j
Figure 1 is a technique according to its status, macroscopically

an enlarged, partially segmented, perspective view of a russian, three-dimensional, fibrous liquid permeable polymer web 40, which was found to be suitable as a topsheet in disposable absorbent articles such as diapers and sanitary napkins. The prior art web is generally

74.346 / BE • · is in accordance with the teachings of USP 4,342,314. The liquid permeable web 40 has a plurality of openings, such as openings 41, formed by a plurality of interconnected fibrous elements, such as, for example, the fibrous elements 42, 43, 44, 45, and 46 on the first surface 50 of the web. Each fibrous element has a base portion, such as a base portion 51, disposed in plane 52 of the first surface 50. Each base portion includes a side wall portion, such as the side wall portion 53, attached to the edges of the base portions. The side wall portions generally extend towards the second surface 55 of the web. The portions of the sidewalls of the fibrous elements intersect each other between the first and second surfaces of the web, and end substantially parallel to the plane 56 of the other surface 55.

In a preferred embodiment, the base portion 51 includes a microscopic pattern of surface aberrations 58, generally in accordance with the disclosure of USP 4,463,045. The microscopic pattern of the surface aberrations 58 provides a substantially non-luminous surface when the web is exposed to light rays.

In an alternative embodiment, the prior art web may comprise a plurality of much smaller capillary mesh structures (not shown) on the first surface 50 of the web, as described in USP 4,637,819. It is believed that the additional porosity provided by the smaller liquid capillary mesh structure allows the fabric of the invention to function more efficiently, a disposable one.

74.346 / BE • · · · · · · · ··· · · ··· · · · · ···. ··· ··· Apply absorbent article as a perforated part.

As used herein, the term "connecting elements" or "connecting elements" refers to some or all of the elements of the elastomeric web, the parts of which serve to define the primary apertures with a coherent mesh structure. Typical interconnecting elements include, but are not limited to

- the fibrous elements of the aforementioned USP 4,342,314 and USP 5,514,105. As can be seen from the following description and the figures, the connecting elements are inherently connected with adjacent connecting elements in mutually adjacent transition portions.

In general, each of the interconnecting elements can be best described with reference to Figure 1 as parts of the elastomeric web that lie between any two adjacent primary openings, originating from the first surface 50 and extending to the second surface 55. On the first surface of the web, the interconnecting elements form a cohesive mesh structure or pattern together, the cohesive mesh of the interconnecting elements defines the primary apertures, and the interconnecting side walls of the interconnecting elements on the second surface of the web form a non-coherent pattern of secondary apertures.

As used herein, the term "contiguous, when used to describe the first surface of an elastomeric web, refers to the uninterrupted nature of the first surface, generally in the plane of the first surface. Thus, any point on the first surface can be accessed from any and all other points on the first surface without substantially leaving the first surface with the plane of the first surface 74.346 / BE • · · ·, · · · · * · • * ·· - ♦ • Se ··· bán. Similarly, the term "non-coherent" used to describe the second surface of the elastomeric web refers to the interrupted nature of the second surface, generally in the plane of the second surface. Thus, a point on the second surface is not accessible from all other points on the second surface without leaving the second surface substantially in the plane of the second surface.

The term "macroscopic term" as used herein generally refers to structural features or elements that are readily visible to the normal human eye when the perpendicular distance between the eye of the observer and the plane of the web is about

30.5 cm (12 inches). In contrast, the term "microscopic term is used to refer to structural features or elements that are not readily visible to the normal human eye when the perpendicular distance between the eye of the observer and the plane of the web is about 30.5 cm (12 inches).

As used herein, the term "macroscopically porous term, used to describe three-dimensional elastomeric webs, tapes, or films, refers to elastomeric webs, tapes, and films that are adapted to the surface of a three-dimensional molding structure so that both surfaces show a three-dimensional pattern of the molding structure. These macroscopically porous webs, tapes, and films are typically embedded in the surface of the forming structures (i.e., the mold structure is primarily a pattern with a protruding projections), or a recess (i.e., the forming structure is primarily a hollow capillary mesh 74.346 / BE). · A pattern with a structure containing a structure), or a resin melt extruded onto the surface of any type of molding tool.

In contrast, the term "planar" used in the description, when used to describe formable webs, tapes, and foils, refers to the global general state of the web, web, or foil, with the naked eye, at a macroscopic magnitude. For example, a non-perforated extruded film or a perforated extruded film that does not exhibit significant macroscopic deformation outside the film plane is generally described as planar. Thus, for a perforated planar web, the edge of the material at the apertures is substantially in the plane of the web, causing the web tension in the web to be directly related to the initial locations of the tear at the apertures.

When macroscopically porous, the multilayer film of the elastomeric web according to the invention is formed into three-dimensional interconnecting elements that can be characterized as channel-like. Their two-dimensional cross-section can also be described as "U-shaped as in USP 4,342,314 mentioned above, more generally as" upward concave, as mentioned above.

USP 5,514,105. The term "upward concave" as used herein describes the orientation of the channel-like shape relative to the surfaces of the elastomeric web, the base generally on the first surface, and the channel protruding from the base towards the second surface and the channel opening substantially on the second surface. As will be described below with reference to FIG. 5, in a plane perpendicular to the plane of the first surface,

74.346 / BE ····

and intersecting any two adjacent primary openings, the cross-section of the connecting element between them is concave in the upward direction, which can generally be U-shaped.

A number of methods are known for the porosity of planar, flexible polymeric webs without openings in the art, such as punching, pruning and perforation with a hot needle. However, if any of the above methods are applied to thermoplastic films, the increase in porosity is typically accompanied by a reduction in the degree of reliable elastic performance. By performing the perforation by conventional methods, the edges of the apertures will be the source of the initial sites of rupture as we apply force to the web as they lie in the plane of stress applied. For conventional thermoplastic elastic films, the tension of the web starts the openings at the openings, which in time propagates and leads to a catastrophic deterioration of the film. If the shape of the apertures is not round, but for example rectangular, three or other polygonal, the possibility of starting the tear increases due to the concentration of tension at the angular intersections of the sides.

The Applicant has found that if a multilayer polymer web comprising a elastomeric layer combined with at least one topsheet is used in the present invention and the multilayer web is converted into a macroscopically porous three-dimensional configuration according to the method described, the elastomeric web produced preferably has a very porous nature and high porosity. it offers flexibility and reliability and high strength.

74 346 / BE

The elastomeric layer itself is preferably capable of stretching at 50-1200% at room temperature in a non-perforated planar state. The elastomer may be a pure elastomer or a mixture with an elastomeric phase or content that still exhibits substantial elastomeric properties at room temperature, including human body temperatures. The elastomeric materials of the present invention may exhibit the desired elastic and tension reduction properties in a monolithic film, in a multilayer film having at least one elastomeric layer, or in a porous three-dimensional web produced by the process described herein. The elastomeric materials preferably have less than about 20%, more preferably less than about 30% elongation at 200% elongation, and most preferably less than about 40% stress reduction at room temperature. The elastomeric materials of the present invention exhibit less than about 45%, preferably less than about 50%, and more preferably less than 55% stress reduction at 50% elongation after 10 hours at body temperature (about 37.8 ° C or 100 ° F).

The topsheet of the present invention is preferably thinner and substantially less elastic than the elastomeric layer, and may in some cases be non-elastic in general. More than one topsheet may be used with the elastic layer according to the invention, and this or they generally modify the elastic properties of the elastomer. If more than one topsheet is used, the topsheets may have the same or different material properties.

Figure 2 is a macroscopic pore according to the invention;

74.346 / BE is an enlarged, partially segmented, perspective view of an embodiment of a three-dimensional elastomeric web, generally with 80 markings. The geometric configuration of the fluid-permeable elastomeric web 80 is generally similar to that of the prior art web 40 shown in Figure 1 and is generally consistent with the description of said patent 4,342,314. Other appropriately shaped film configurations are described in USP 3,929,135, 4,324,246 and 5,006,394.

A preferred embodiment of the elastomeric web 80 of the present invention has a plurality of primary apertures such as the primary openings 71 formed by the interconnecting structure of interconnected elements such as the elements 91, 92, 93, 94, 95 in the plane 102 of the first surface 90. The shape of the primary apertures 71 designed in the plane of the first surface 90 is preferably polygonal, for example in a square, hexagonal, etc., arranged or random pattern. In a preferred embodiment, each interconnecting member has a base portion, e.g., a base portion 81 disposed in the plane 102, and each side portion includes a side wall portion, such as a side wall portion 83, attached to their edges. The side wall portions 83 generally extend in the direction of the second surface 85 of the web and intersect the side walls of adjacent connecting elements. The intersecting side wall portions interconnect the first and second surfaces of the web and terminate substantially parallel to each other, forming a secondary opening, e.g. a secondary opening 72, in the plane 106 of the second surface 85. A detailed description of the porous macroscopically expanded three-dimensional elastomeric web is described in USP 08 / 816,106.

Figure 3 is a further enlarged partial view of a web of a type similar to the web 80 of Figure 2 illustrating an alternative web construction according to the invention. The molded film 120 of the multilayer polymer 80 of the web 80 preferably comprises at least one elastomeric layer 101 and at least one cover layer 103. Figure 3 shows the double-layer embodiment that the topsheet 103 is closer to the first surface 90, but it is believed that the layering of the molded film 120 is not restrictive. It is currently advantageous, as shown in Figure 3

that the polymer layers end in substantially parallel to the plane of the second surface, but currently it is not considered essential that this is the case, i.e. one or more layers may extend further to the second surface than the other. The elastomeric layer comprises from about 20% to about 95% of the total thickness of the film, and from about 1% to about 40% of the total thickness of the film. The elastomeric film typically has a thickness of about 0.012 mm (0.5 mL) to about 0.51 mm (20 mL), preferably about 0.025 mm (1.0 mi) to 0.13 mm (5.0 mi).

Each topsheet typically has a thickness of about 0.0012 mm (0.05 mi) to about 0.13 mm (5 microns), and preferably about 0, 0025 mm (0.1 mi) to about 0.038 mm (1.5 mi) thick. In a preferred embodiment, the elastomeric layer is about 0.052 mm (3.2 mils) thick and each topsheet is about 0.038 mm (0.15 mils) thick.

A particularly preferred multilayer film of polyamide 80 poly 74.346 / BE ···· mer is shown in cross sectional view in Figure 4, illustrating the elastomeric layer 101 between the two topsheet 103. The elastomeric layer 101 preferably comprises a thermoplastic elastomer having at least one elastomer part and at least one thermoplastic part. The thermoplastic elastomer typically consists of a substantially coherent amorphous matrix with glassy and crystalline regions at the same distance. Theoretically, we do not want to bind ourselves, but we think that non-interrelated regions act as useful physical crossings that allow the material to exhibit elastic memory when the material is subjected to tension and then allowed to loosen. Preferred thermoplastic elastomeric materials are block copolymers and mixtures thereof. The thermoplastic elastomer materials useful in the present invention are styrene-butadiene-styrene or similar styrene block copolymers. Also suitable as thermoplastic elastomers are certain polyolefins which exhibit the desired thermoplastic elastomeric nature and the resulting elastic properties such as polyethylenes and polypropylene having a density below about 0.90 g / ml. The topsheet preferably consists of substantially less elastomeric materials, such as polyolefins having a density greater than about 0.90 g / ml or other thermoplastic materials. The topsheets must have sufficient adhesion to the elastomeric layer so that no layer separation occurs completely before or after the web is stretched. Suitable materials for the topcoat should have the desired melt flow properties such that

74.346 / BE ··· can be successfully processed with the elastomeric layer to form a multilayer film. A preferred method for producing the multilayer polymeric film 120 is co-extrusion.

An elastomer, a low tensile material, can generally be produced from a composition comprising an elastomeric block copolymer, at least one thermoplastic resin or mixture, and a low viscosity processing oil, with the desired cluster and stress reduction properties. A preferred composition comprises about 55% by weight of styrene-olefin triple block copolymer, about 15% by weight of polystyrene and about 30% by weight of mineral oil. The compositions may further comprise other additives such as antioxidants, anti-blocking agents, and anti-slip agents. The amount of antioxidants is typically not more than 1%, preferably not more than 0.5%, based on the total weight of the elastomer compositions.

A number of block copolymers can be used to prepare elastomeric compositions useful in the preparation of the low-stress elastomeric film or sheet according to the invention. Thus, linear block copolymers such as ABA triple block copolymers, ABAB quad-block copolymers ABABA five block copolymers or the like can be appropriately selected based on the array content and the average molecular weight of the blocks. These block copolymers generally comprise an elastomeric part B and a thermoplastic part A. The block copolymers useful in the present invention are thermoplastic and elastomers. Block copolymers are elastomers in the sense that they generally form a three-dimensional, physically crosslinked or kneaded structure for the thermoplastic block 74,346 / BE ···· *

• below the glass transition temperature of the part, thus showing elastic memory in response to external forces. Block copolymers are thermoplastic in the sense that they can be melted above the glass transition temperature of the end block Tg, molded and re-solidified several times without altering the physical properties or with minor changes (assuming minimal oxidative degradation).

In these copolymers, the A moieties are hard blocks and are derived from materials that have a sufficiently high glass transition temperature to form crystalline or glassy regions at the temperature of use of the polymer. These hard blocks generally form strong physical confusions or agglomerates with other hard blocks in the copolymers. The hard part A consists of polyvinyl arene derived from styrene, a-raethyl styrene monomers, or other styrene derivatives or mixtures thereof. The hard part A may also be a copolymer derived from styrene monomers, such as those described above, and olefinic monomers such as ethylene, propylene, butylenes, isoprene, butadiene, and mixtures thereof.

The hard part A is preferably polystyrene having a number average molecular weight of from about 1,000 to about 200,000, preferably from about 2,000 to about 100,000, more preferably from about 5,000 to about 60,000. The hard part A for the total weight of the copolymer is from about 10% to about 80%, preferably from about 20% to about 50%, more preferably from about 25% to about 35%.

B block material at the polymer operating temperature

74 346 / BE

has a low glass transition temperature so that crystalline or glassy regions do not form at their operating temperatures. The array B is thus considered to be a soft array. The soft part B is typically an olefinic polymer derived from conjugated aliphatic diene monomers of about 4 to about 6 carbon atoms, or linear alkene monomers of from about 2 to about 6 carbon atoms. Suitable diene monomers include butadiene, isoprene and the like. Suitable alkene monomers include ethylene, propylene, butylene and the like. The soft part B is preferably a substantially amorphous polyolefin such as ethylene / propylene polymer, ethylene / butylene polymer, polyisoprene, polybutadiene and the like, or mixtures thereof. The number-average molecular weight of the soft block B is typically about 1,000 to about 300,000, preferably about 10,000

about 200,000 and more preferably about 20,000 to about 100,000. The soft mass B is typically about 20% to about 90%, preferably about 50% to about 80%, more preferably about 65% to the total weight of the copolymer.

- about 75%.

The bulk copolymers suitable for use in the present invention comprise at least one substantially elastomeric part B and at least one substantially thermoplastic part A. Block copolymers may contain multiple arrays. In a preferred embodiment, the block copolymer may be an ABA three-block copolymer, an ABAB four-block copolymer, or an ABABA five-block copolymer. Also preferred are three-block copolymers having an elastomeric center array B and A and A 'thermoplastic end-blocks, wherein A and A' are different vinyl arenas.

T4.346 / BE may be derived from monomers. Also preferred in the present invention are block copolymers which contain more than one array A and / or more than one array B, each of which is an array of the same or different vinyl arsenic monomers and each array B may be from the same or different olefinic monomers. The block copolymers may also be radial with three or more branches, each branch being a copolymer of BA, BABA, or the like, and blocks B at or near the center of the radial polymer. Good results can be obtained, for example, with four, five or six branches. The olefin array typically contains at least about 50% by weight of block copolymer. If desired, the unsaturation of the olefinic double bonds can be selectively hydrogenated to reduce oxidative degradation sensitivity and may have a beneficial effect on the elastomer properties. For example, a polyisoprene array can be selectively reduced to form an ethylene-propylene block. The vinyl arena array typically contains at least about 10% by weight of block copolymer. However, the higher molecular weight vinyl arsenic content is more advantageous for high elasticity and low stress reduction properties.

The bulk copolymers in the elastomer composition can be used in an effective amount to achieve the desired elastic and low tensile reduction properties. The block copolymers in the elastomer compositions are typically about 20

- about 80% by weight, preferably from about 30% to about 70% by weight, and more preferably from about 40% to about 60% by weight.

In the present invention, styrene-olefin 74.346 / BE is preferred

··· · ·· ·

styrene three block copolymers such as styrene-butacylene styrene (SBS), styrene-ethylene / butylene-styrene (S-EB-S), styrene-ethylene / propylene styrene (S-EP-S), styrene-isoprene styrene (SIS), hydrogenated polystyrene-isoprene / butadiene-styrene (S-IB-S) and mixtures thereof. Block copolymers may be used as mixtures of block copolymers, as a blend of one or more block copolymers with one or more other substantially less elastomeric polymers such as polypropylene, polyethylene, polybutadiene, polyisoprene or mixtures thereof. The block copolymers used preferably contain only minor amounts and most preferably do not contain such other polymers.

Particularly preferred block copolymers for use herein are polystyrene-ethylene / butylene-polystyrene block copolymers having a styrene content of greater than about 10% by weight. With higher styrene content, polystyrene particles are generally relatively high molecular weight. Such styrene-ethylene / butylene styrene (S-EB-S) linear block copolymers are commercially available as commercial KRATON® G160 series from Shell Chemical Company, Huston, TX. Also preferred are polystyrene-ethylene-ethylene / propylene styrene (S-EEP-S) block copolymers in which the ethylene / propylene block is derived from the selective hydrogenation of the unsaturated sites of the polystyrene-isoprene / butadiene-styrene block copolymers. Hydrogenated polystyrene-isoprene / butadiene / styrene (s-IB-S) block copolymers are commercially available as Septon 400 commercial series at Kuraray America, Inc., New York, NY. The aforementioned styrene-olefin block copolymers described above are suitable for use in low tension reducing materials themselves or in mixtures.

Various thermoplastic or substantially less elastomeric materials or mixtures may be used in the low stress elastomeric material of the present invention. Suitable thermoplastic polymers should preferably be linked to the solid blocks of block copolymers to form a fused three-dimensional mesh structure. Theoretically, we do not want to bind ourselves, but we think that the meshed structure can improve the elongation, elasticity, and tensile properties. Thermoplastic polymers such as polyphenylene oxide and vinyl arsenic resins derived from monomers of styrene, α-methylstyrene, other styrene derivatives, vinyl toluene and mixtures thereof can be used according to the invention. These polymers are preferred because they are chemically compatible with the styrene hard blocks of block copolymers, it is believed that it is advantageous if the components are compatible because they more easily form a mixed three-dimensional mesh structure and do not physically evolve significantly from the mesh structure.

The thermoplastic polymers used in the present case, as well as the hard block component associated with them, must be of appropriate molecular weight. The thermoplastic polymers should preferably have a medium molecular weight that is large enough to increase their glass transition temperature, elongation and elasticity properties. Furthermore, the average molecular weight of the thermoplastic polymers useful in the present invention is

74.346 / BE should not deviate significantly from hard blocks of elastomeric block copolymers and thus be compatible with hard blocks. The number-average molecular weight of the corresponding vinyl arsenic resins is preferably from about 600 to about 200,000, more preferably from about 5,000 to about 150,000, and most preferably from about 10,000 to about 100,000. Polystyrene is particularly preferred. A preferred number-average molecular weight of polystyrene is from about 40,000 to about 60,000, and is available as a NO 200 series brand, PS 200, at Nova Chemicals, Inc. Monaca, PA.

Theoretically, we do not want to bind ourselves, but we think that polymers or resins that can be used as a hard block-related component must have a glass transition temperature (Tg) higher than the application temperature of the elastomeric material in order to "close the three-dimensional mesh the desired properties. When the gap between the application temperature and the glass transition temperature is narrower, these polymers "may be removed from the mesh structure and weaken the mesh structure. As a result, this has a negative effect on the elongation, elasticity and tensile properties of the elastomeric material. These negative effects are predominantly expressed in stress-reducing properties.

For body temperature applications, such as absorbent articles, bandages, bandages, and wound dressings, which are worn by a person around the body for a longer period of time, it was previously thought to have a higher glass transition temperature.

74.346 / BE polymers such as polyphenylene oxide should be used. However, polyphenylene oxide is difficult to process because of its high melting temperature and relatively high melt viscosity. Furthermore, the high processing temperature required for the polyphenylene oxide may result in the decomposition of other components in the elastomeric materials or end products. The starting modulus of polyphenylene oxide can also be too large for extensible articles, and undesirable forces should be applied to place the article on the wearer.

Although the glass transition temperatures of vinyl arsenic resins are significantly lower than those of polyphenylene oxides, it has surprisingly been found that vinyl arsenic resins can be used in the elastomeric materials of the present invention, providing the desired elasticity and stress reduction properties at body temperature under sustained loading conditions. Furthermore, vinyl arsenic resins can be easily processed at relatively low temperatures, so that the decomposition of other thermoplastic materials or elastomeric components does not occur, or is only modest.

The vinyl arsenic resins useful in the present invention should have a glass transition temperature ranging from about 58 ° C to about 180 ° C, more preferably from about 70 ° C to about 150 ° C, more preferably from about 90 ° C to about 130 ° C.

Polymers that are bound as hard blocks can also be used in low molecular weight aromatic hydrocarbon resins, alone or in mixtures with higher molecular weight polyvinyl arenes, in particular polystyrenes. The low molecular weight 74.346 / BE aromatic resins are preferably derived from vinyl arene monomers. Low molecular weight resins provide a lower viscosity, making the elastomer compositions better processed. Without theoretical considerations, it is believed that lower molecular weight resins will be less effective in forming three dimensional composite structures with hard blocks of elastomeric copolymers and polystyrene. And because of their low molecular weight, the resins can be attached to elastomeric soft blocks or thermoplastic hard blocks. In fact, the incorporation of low molecular weight resins reduces the percentage of hard-knit mesh structures in the composition. Therefore, it is generally believed that low molecular weight resins can be used as processing aids, but generally have a negative effect on the elasticity and stress reduction properties of films made from resin-containing compositions. Surprisingly, it has been found that elastomeric compositions containing low molecular weight aromatic hydrocarbon resins, alone or in combination with polystyrenes, have suitable elasticity and stress reduction properties for use in the present invention.

In mixtures, the ratio of polystyrene to aromatic hydrocarbon resin is typically about 1:10 to about 10: 1, preferably about 1: 4 to about 4: 1. The number-average molecular weight of aromatic hydrocarbon resins typically ranges from about 600 to about 10,000. Preferred aromatic hydrocarbon resins have a glass transition temperature of about 60 to about 105 ° C, a number-average molecular weight of about 600 to about

74.346 / BE • · · · · · · · · · · · · · · · · · · · · · · · · ·

4000. Preferred aromatic hydrocarbon resins are ENDEX 155 or 160, KRISTALEX® 3115 or 5140, PICCOTEX®20 and PICCOLASTIC® D125, all available from Hercules, Inc. in Wilmington, DE.

Mixtures of thermoplastic polymers or resins are generally typically present in an amount of from about 3 to about 60 weight percent, preferably from about 5 to about 40 weight percent, and more preferably from about 10 to about 30 weight percent, of the low-stress elastomer composition used in the present invention.

Although polystyrene, low molecular weight aromatic hydrocarbon resins, and other end-joint polymers or resins may provide lower melt viscosity and facilitate the processability of the composition, it has been found that an additional processing aid such as a hydrocarbon oil is advantageous to further reduce viscosity and facilitate processability. . The oil reduces the viscosity of the elastomeric composition, making the elastomer composition easier to process. However, the processing oil can reduce the retention of the elastomer and the elongation properties of the compositions. The processing oil is typically present in the elastomeric compositions up to about 60% by weight, preferably from about 5% to about 60% by weight, more preferably from about 10% to about 50% by weight, and most preferably from about 15% to about 45% by weight.

In a preferred embodiment, the processing oil is compatible with the composition and does not substantially decompose at the processing temperature. Hydrocarbon oils are suitable for use

74.346 / BE • ··· ·· can be linear, branched, cyclic, aliphatic or aromatic. Preferably, the processing oil is a white oil available from BRITOL® at Witco Company, Greenwich, CT. Another mineral oil is also used as processing oil under the brand name DRAKEOL® from Pennzoil Company Penrenco Division, Karns City, PA.

Generally, elastomeric compositions having the desired elastic properties may be prepared from a composition that essentially contains only one block copolymer. However, such a formulation is generally difficult to process due to the high viscosity of the composition and its highly gummy and sticky nature. In addition, the tackiness of the elastomer composition is difficult to handle. For example, the composition can be processed into a film that tends to adhere to the processing apparatus and is difficult to remove, or when the composition is processed and wound, tends to merge and it will be very difficult to unwind for further processing into the final product.

It has been found that when the pure block copolymer is mixed with other thermoplastic polymers and processing oils, the processability and handling of the composition is improved. Thermoplastic polymers and processing oils tend to reduce the viscosity of the composition and ensure better processing of the composition. In order to further improve the processability and treatment of the composition, in particular if a film of such an elastomer is desired, at least one topsheet may be laminated to the elastomeric composition substantially less of the elastomeric material. In a preferred embodiment, the elastomeric composition is coextruded with thermoplastic compositions, producing a middle elastomeric layer between two topsheets, each of which fits one side of the middle layer. The two topsheets may be made of the same or different thermoplastic materials.

The topsheet is preferably at least partially compatible or miscible with one of the components of the elastomeric block copolymers, so that there is sufficient adhesion between the middle elastomeric layer and the topsheet for further processing and treatment. The topsheet may comprise thermoplastic polymers or mixtures of thermoplastic polymers and elastomeric polymers, so that the topsheet is substantially less elastomer than the middle elastomeric layer. The permanent deformation of the topsheet is typically at least about 20%, preferably at least about 30%, more preferably at least about 40% higher than the elastomer middle layer. Suitable thermoplastic polymers for use as topsheet include polyolefins derived from monomers of ethylene, propylene, butylene, isoprene, butadiene, 1,3-pentadiene, α-alkene such as 1-butene, 1-hexene, 1-octene and mixtures thereof; and ethylene copolymers such as ethylene vinylacetate copolymers (EVA), ethylene methacrylate copolymers (EMA) and ethylene acrylic acid copolymers, polystyrenes, poly (α-methylstyrene), styrene random block copolymers (such as INDEX® interpolymers which are Dow Chemicals, Midland , Available from MI), polyethylene oxides and mixtures thereof. Additionally, bonding layers may be used to promote adhesion between the middle elastomeric layer and the thermoplastic lid 74.346 / BE layer.

Fig. 5 is a plan view of alternative primary aperture shapes designed on the first surface of another elastomeric web according to the invention. Although a repeating pattern of the same shape apertures is preferred, the shape of the primary apertures such as the openings 71 may be generally circular, polygonal or mixed and may be arranged in a pattern or random pattern. Although not shown in the figure, the design may be elliptical, drop or any other shape, i.e. the invention does not depend on the shape of the apertures.

The interconnecting (interconnecting) elements are intrinsically related, wherein the adjacent connecting elements melt into mutually interconnected transition zones or portions, such as transition zones 87, as shown in Figure 5. The transition portions can generally be defined by the largest circle that touches all three adjacent openings. It should be noted that, in certain patterns of the openings, the entered portion of the transition portions may affect more than three adjacent openings. For purposes of illustration, the connecting elements may be conceived as starting or ending in the centers of the transition portions int. Likewise, the sidewalls of the connecting elements can be described as corresponding to the point of contact at which the adjacent opening is touched by the inscribed region of the transition portion.

Notwithstanding the transition zones, the transverse cross-sections of the center line between the beginning and the end of the connecting elements are generally preferably U-shaped. However, the transverse cross section 74.346 / BE does not have to be the same along the entire length of the connecting element, and in some aperture configurations is not uniform over most of its length. For example, as will become apparent from the cross-sectional views of Figure 5, the width dimension 86 of the base portion 81 may vary along the substantially long length of the connecting element. Specifically, the transition zones 87 or portions 87 integrate the connecting elements into contact connecting elements, and the transverse cross-sections in the transition zones or portions exhibit substantially non-uniform U-shapes or unobtrusive U-shapes.

Without wishing to be bound by theories, it is believed that the fabric of the invention is more reliable (i.e., resistant to catastrophic defects) when subjected to stretching tension due to the mechanism schematically illustrated in cross-sections of Figures 8.A-8.C, and by recording on 9-11. photomicrographs.

Fig. 8A shows a primary opening 71 in plane 102 of first surface 90 and secondary opening 72 in plane 106 of second surface 85, further away from plane 102 of first surface 90 of web 80, not stretched. If the web 80 stretches a

8B, the first surface 90 is tensioned and the primary opening 71 is tensioned in a deformed configuration. However, the circumference of the primary opening 71 is converted by the connecting elements into a coherent first surface. Therefore, the opening 71 has no "edges to the tear-off locations, which would compromise the elastic reliability of the web. The edges of the secondary openings 72 are capable of starting a tear

They do not receive significant stretching tension until the web has been stretched to the top of the web. \ T74.346 / BE · · ···· · ··· where the plane 106 is no longer away from the plane 102 of the first surface 90, as shown in FIG. 8C. At the point where the planes 102 and 106 are no longer distant from each other, the web 80 begins to act as a substantially planar, perforated web.

It is instructive to consider the ratio of the global "D" depth of the web and the "T thickness" of the film in a non-stretched elastomeric web in Figure 8A. The AD / T ratio may be expressed as a tensile ratio, since it belongs to the amount of film that extends in the plane of the first surface as a result of the molding process of the present invention. The Applicant is of the opinion that the increase in the tensile rate generally serves to increase the tear resistance as the second surface is further away from the first surface.

Without wishing to be bound by theories, it is believed that when the web 80 is stretched or stretched, the elastomeric layer 101 of the present invention allows the base 81 of the connecting element to form a coherent web in the associated first layer 90 for tensioning. The topsheet 103 helps to maintain the three-dimensional nature of the web, despite the applied tension, allowing elongation on the contiguous first surface 90, and the resulting deformation of the primary openings 71, which at least partially extend away from the non-coherent second surface, thereby minimizing it elongation of secondary openings 72. Therefore, the tension caused by the elongation on the continuous first surface of the web substantially relieves the possible rabbit 74.346 / BE · · · ··· · ··· · · ··· · · ··· ·· ♦ ··· · · Tension caused by tension, the starting points of the tear on the non-adjoining second surface, at least until the secondary openings begin to enter the plane of the first surface. This substantial separation or release of the tension caused by the stretching of the web from the tension caused by the elongation at the secondary apertures significantly increases the reliability of the web, allowing the web to be repeatedly and permanently stretched, up to about 400% or more, without opening the web without openings in the web. as a result of its origins.

9-11. 8A8C illustrate the mechanism shown schematically in FIGS. Figure 9 is an optical microfilm showing the first surface and primary openings of the web formed according to the method described herein. The continuous first surface of the web embodiment shown in Figure 9, as shaped, is in a non-stretched configuration, usually a regular pattern of 1 mm 2 primary openings at 1 mm apart on each side. FIGS. 10 and 11 are a photomicrograph of a scanning electron microscope showing a non-coherent second surface of the web embodiment of FIG. 9 in a slightly different size. Fig. 10 is a general view of a second surface of an elastomeric web in a non-stretched plane further from the plane of the first surface. The 11th

Figure 2 shows the second surface of the web with a stretch of about 100%. As shown in Figure 11, the edges of the secondary openings are away from the plane of the first surface. Although some deformation of the secondary apertures occurs, the edges remain substantially unstretched. The web

The tension caused by stretching is also substantially different from the tension caused by the elongation at the secondary openings, which significantly increases the reliability of the web.

It is known in the art to have different elastic behavior of planar multilayer films or fibers having a relatively less elastic topsheet which is stretched beyond its elastic limit, as mentioned above.

USP 5,501,679, and 5,376,430 and 5,352,518. As described in the prior art, once the topsheet has been regenerated after stretching beyond the elastic limit of the topsheet, the topsheet may form a microscopic microtexture of peak and recess irregularities due to the increased surface area of the topsheet relative to the elastomeric layer.

Similarly, if the web of the invention is stretched for the first time, it may be stretched beyond the elastic limit of the topsheet of the elongated portion. The elastomeric layer allows the web to return to its pre-tension, macroscopic, three-dimensional configuration, but portions of the topsheet that are stretched beyond the elastic limit cannot return to the pre-tension configuration due to excess material resulting from non-elastic elongation. . After post-elongation regeneration, the topsheet forms a microscopic microtexture of peak cavity irregularities, more generally as transverse folds, as shown in the microfilm of Figure 12. The folds are formed in substantially identical patterns on the connecting elements, generally transverse to the

74.346 / BE for tensioning and generally radially located around the primary openings. Depending on the extent of the web opening, the folds may be substantially limited to the continuous first side of the web or more generally extend over the entire surface of the connecting elements.

Without theoretical constraints, it is believed that transverse folds are preferred to the elastomeric web for at least two reasons. First, the folds give a softer global texture or feel to the elastomeric web. Second, the folds radially located on the primary apertures and extending toward the secondary openings may facilitate improved fluid handling properties when used as a body-woven fabric for a disposable absorbent article.

A typical embodiment of the elastomeric web according to the invention, which can be used in a disposable absorbent article, in the form of a diaper 400, is shown in Figure 13. As used herein, the term "diaper" refers to a garment generally worn by children and incontinent persons around the lower part of the wearer's body. It should be noted, however, that the elastomeric web according to the invention can also be applied to other absorbent articles, such as incontinence pants, lined pants, sanitary napkins and the like. The diaper 400 shown in FIG. 13 is a simplified absorbent article which may be a diaper before being placed on the wearer. It should be noted, however, that the present invention is not limited to the specific type or configuration of the diaper shown in Figure 13.

74.346 / BE «···

A particularly preferred, typical embodiment of a disposable absorbent article is disclosed in U.S. Patent No. 5,151,092.

Figure 13 is a perspective view of the diaper 400 in a non-constricted state (i.e., all resilient portions that cause contraction are removed), wherein some portions of the structure are cut to illustrate the structure of the diaper 400 more clearly. The portion of the diaper 400 that is in contact with the wearer faces the viewer. The diaper 400 shown in Figure 13 preferably comprises a liquid permeable topsheet 404, a liquid impervious backsheet 402 attached to the topsheet 404, and an absorbent core 406 positioned between the topsheet 404 and backsheet 402. Other structural elements, such as elastic leg protectors and fastening means for maintaining the diaper on the wearer, are also applicable.

While the topsheet 404, backsheet 402, and absorbent core 406 can be assembled in a number of known configurations, diapers are preferred.

-konfigurációkat however, are described in general USP
3,860,003, 5,151,092, 5,221,274, 5, 554.145, 5,569,234 and
No. 5,580,411 patent documents, and USP 08 / 915.471 No.

patent application.

Figure 13 illustrates a typical embodiment of the diaper 400 in which the topsheet 404 and backsheet 402 can be stretched together, and their length and width dimensions are generally greater than the absorbent core 406. The topsheet 404 is located on and backed by the backsheet 402, forming the borderline of the diaper 400. The boundary defines the outer casing 74.346 / BE of the 400 diaper. The boundary includes end edges 401 and longitudinal edges 403.

The size of the backsheet 402 is determined by the size of the absorbent core 406 and the precise design of the diaper. In a preferred embodiment, the backsheet 402 has a modified hourglass shape extending beyond the absorbent core 406 at a distance of at least about 1.3 cm and no more than about 2.5 cm around the entire circumference of the diaper.

The topsheet 404 and backsheet 402 may be joined in any suitable manner. As used herein, the term "linkable term" includes configurations in which the topsheet 404 is directly attached to the backsheet 402, the topsheet 404 is attached directly to the backsheet 402, and configurations in which the topsheet 404 is indirectly attached to the backsheet 402, the topsheet 404 is intermediate. fastened to the back panel 402. In a preferred embodiment, the topsheet 404 and backsheet 402 are directly attached to each other at the border of the diaper by means of attachment means (not shown), such as adhesive or other fastening means known in the art. For example, a flat, continuous adhesive layer, a patterned adhesive layer, or separate adhesive lines may be used to fasten the topsheet 404 to the backsheet 402.

-spot layout.

The finishing edges 401 form the waist region, which in a preferred embodiment consists of a pair of elastomeric side panels 420 extending laterally from the finishing edges 401 of the diaper 400 in an elongated configuration. In a preferred embodiment

74.346 / BE · <»··« · ··· · «· · · · · · · · · · · · ·« · »· · · · ·« ··· The side panels 420 consist of an elastomeric web according to the invention. In a particularly preferred embodiment, when used as elastomeric side panels, the web according to the invention is further processed to form a composite laminate, one or preferably on both edges, bonded with fibrous, nonwoven materials, forming a soft, flexible, elastic member using methods known in the art such as adhesive bonding. .

Suitable nonwoven materials for use in the composite laminate of the present invention are nonwoven materials made of synthetic fibers (polypropylene, polyester or polyethylene), natural fibers (fibers), (wood, cotton, rayon) or natural and synthetic fibers. Suitable nonwoven materials can be produced by a variety of methods, such as carding, forming flux materials, mixing with water, and other methods known to those skilled in the art of weaving. A currently preferred nonwoven nonwoven material is carded polypropylene which is commercially available from Fiberweb of Simpsonville SC.

The fibrous nonwoven materials can be reinforced with the various binding methods known in the art for the elastomeric web. Suitable joining methods include adhesive bonding, such as a uniform, continuous adhesive layer, patterned adhesive layer, or arrangement of separate lines, spirals or patches of the adhesive, or other methods such as thermal bonds, compression joints, ultrasonic joints, dynamic mechanical joints, or any other suitable joining process. or combinations of such binding methods, as in a

It is known from the literature. Typical binding methods are described in US SIR No. H 1670 (1997).

Once attached to a fibrous (fibrous) nonwoven material, the composite web tends to be less elastomer due to the relatively non-elastic nature of the bonded nonwoven material. In order to make the nonwoven material more resilient and to restore the elasticity of the composite laminate, the composite web may be processed by methods and apparatus that are used to "flexibly tension the zero-elongate laminates as described in USP 5,151,092 and the aforementioned U.S. Pat. 5,167,897, 5,156,793 and 5,143,679. The elasticized "zero-stretch composite web" thus produced gives a soft, textile-like feel for longer use and fits comfortably in the absorbent garment.

The side panels 420 may be fastened to the diaper in any manner known in the art. For example, as shown in Figure 13, the side panels 420 may be attached directly to the backsheet 402 by suitable means (not shown) such as an adhesive or any other method of attachment known in the art. A particularly preferred embodiment of the side panels 420 is shown in FIG. 14, which is described in more detail in U.S. Patent No. 5,669,897 and in U.S. Pat.

U.S. Patent Application Serial No. 08 / 155,048.

As shown in Figure 14, the side panel 420 preferably consists of two webs or strips 421 and 422. A 421

The strip 74.346 / BE and 422 may be two separate strips or otherwise formed by bending a single strip at the leading edge 424 and the two strip lengths thus obtained are bent in a non-parallel manner. When two separate strips are used, they can be bonded with a suitable adhesive on the guide edge 424 and can be attached to the tape tab 423 at the same time. The side panel 420 may be attached to the backsheet 402 in the binding region 425 in any suitable manner, and in particular as described in the aforementioned patent application 5,669,897. It is not necessary for the side panel to be a pair, but preferably for each other's reflections. Other examples of diapers with flexible side panels are described in USP

4,857,067, 4,381,781, 4,938,753, 5,151,092, 5,221,274, 5,669,897 and 5,897,545, and U.S. Pat. No. 08 / 155,048.

The diaper 400 may also include the locking system 423.

The fastening system 423 maintains the waist regions 401 in a overlapping configuration, providing lateral tension forces around the circumference of the diaper 400, thereby holding the diaper 400 in the wearer. Preferably, the fastening system 423 comprises strip tabs and / or fastening clip fasteners, but any other known fixing means is generally acceptable. Exemplary recording systems are described in USP 3,848,594, 4,662,875, 4,846,815, 4,894,060,

4,946,527, cited above, 5,151,092 and 5,221,274. The recording system may also include a means to hold the article in a designated shape as it is

USP 4,963,140. The recording system may include primary and secondary recording systems

74 346 / BE

as described in U.S. Patent No. 4,699,622 to reduce the displacement of overlapping portions or to improve the fit, as disclosed in USP 5,242,436, 5,499,978,

5,507,736 and 5,591,152. In alternative embodiments, the opposite sides of the garment can be sewn or welded to form pants. This allows the article to be used as a diaper or as a lined bottom.

Other elastic members (not shown) of the present invention may be positioned adjacent the boundary line of the diaper 400. Elastic elements are preferably located along each of the longitudinal edges 403, so that the elastic members pull out and hold the diaper 400 against the wearer's thighs. In addition, the elastic members may be placed along one or both of the finishing edges 401 of the diaper 400 to form a waistband, or rather as a thigh protector, such as a suitable waistband described in USP 4,515,595. In addition, a method and apparatus for the manufacture of disposable diapers with flexible elastic elements is disclosed in USP 4,081,301.

The elastic members are resiliently tightened to the diaper 400, so that, in a normally non-blocked configuration, the elastic members effectively contract or crease the diaper 400. Elastic elements can be fastened in at least two ways in a flexibly contracted state. For example, the elastic members can be stretched and fastened while the diaper 400 is in a non-constricted state. Besides that,

74.346 / BE • · the diaper 400 can be tightened, for example, by loading (rolling), and the elastic members can be fastened and fastened to the diaper 400, while the elastic members are relaxed or unstretched. The elastic members may extend along a portion of the length of the diaper 400. Alternatively, the elastic members may extend along the entire length of the diaper 400, or in any other length suitable to provide a flexibly foldable line. The length of the elastic element is determined by the design of the diaper.

Elastic elements can have many different configurations. For example, the width of the elastic members may vary from about 0.25 mm to about 25 mm or more;

the elastic member may comprise a single strand of elastic member or multiple parallel or non-parallel fibers of the elastic material; or the elastic members may be square or curved. Further, the elastic members may be attached to the diaper in one of the many ways known in the art. For example, the elastic members may be attached to the diaper 400 by ultrasonic bonding, heat or pressure using a plurality of attachment patterns; or the elastic elements can simply be attached to the diaper 400.

As shown in FIG. 13, the absorbent core 406 comprises the fluid distribution element 408. In a preferred configuration, as shown in FIG. 13, the absorbent core 406 further comprises a collecting layer 410 in fluid communication with the fluid distributing member 408 and disposed between the fluid distribution member 408 and the topsheet 404. The 410

74.346 / BE • A collection layer or element may consist of several different materials, such as nonwoven or woven fabrics of synthetic fibers, including polyesters, polypropylene or polyethylene; natural fibers such as cotton or cellulose or a mixture thereof, or any other similar material or mixtures thereof.

When used, the diaper 400 is placed on the wearer, the rear waistband region placed under the wearer's back, and the remainder of the diaper 400 stretched between the wearer's thighs so that the front of the waistband is placed in front of the wearer. Then, the side panels are tightened as needed for comfort and fit, and the tab or other fastening means is preferably secured to the outward facing portion of the diaper 400. With the side panels 420 comprising the elastomeric web according to the invention, the diaper can be used for children of different sizes, for example, by providing a tight but comfortable fit with breathability.

A disposable diaper is shown as a preferred embodiment of a garment comprising an elastomeric web according to the invention, but the disclosure does not imply limiting the web to disposable diapers. Other disposable garments may also comprise an elastomeric web according to the invention in their various parts, providing additional comfort, fit and breathability. It is also contemplated that even durable garments, such as undergarments and swimwear, can utilize the porous and elongation characteristics of the elastomeric web according to the invention.

74 346 / BE

The multilayer film 120 of the present invention may be processed using conventional methods for producing multilayer films on a conventional coextrusion film making apparatus. Polymers can generally be processed from melt into films using casting or blow molding extrusion techniques as described in the literature [Plastics Extrusion Technology 2nd Ed, by Allan A. Grift (Van Nostrand Reinhold, 1976)]. The cast foils are extruded on a linear wide-slit tool. The flat web is generally cooled on a large, movable polished metal cylinder. The film cools rapidly, peeling off the first cylinder, passing through one or more auxiliary rollers, then on a series of rubber-coated tensile or take-off rollers and finally a roller.

In blowing foil extrusion, the melt is extruded upward on an orifice of a narrow annular tool. This process is also referred to as the film extrusion of the film. Air is introduced through the middle of the tool, the tube is filled with gas and allowed to expand. Thus, a moving bubble is formed, which is kept constant, controlled by internal air pressure. The film tube is cooled, blown through one or more cooling rings that surround the tube. The tube is then allowed to collapse so that it is pulled into a flat frame by a pair of tensile rollers and from there into the coil.

In a co-extrusion process, more than one extruder and either a coextruder feeder or a plurality of manifold tooling systems or a combination of the two are required to obtain the multilayer film structure. USP 4,152,387 and 4,197,069 describe coextrusion.

74.346 / BE. Several extruders are connected to the dispenser having movable flow distributors, which proportionally change the geometry of each flow channel in direct relation to the volume of polymer passing through the channel. Flow channels are designed so that at their juncture, the materials flow together at the same flow rate and pressure, eliminating interface tension and flow instability. When the materials are joined in the dispenser, they pass into a single distributor tool as a composite structure. In these methods, it is essential that the melt viscosities and melt temperatures of the materials do not differ too much. Otherwise, flow instabilities may occur in the tool, which results in the layer thickness distribution being difficult to control in the multilayer film.

Another solution for dispensing co-extruding is a plurality of distribution line or rotary tool as described in USP 4,152,387 and 4,197,069 and 4,533,308 mentioned above. While the dosing system brings melt currents outside the tool housing and before entering, the melt flow in a plurality of distribution line or rotary blade tools has its own distribution line in the die, where the polymers are independently passed through their respective distribution lines. The molten currents are joined to the outlet of the tool, each of the melt flow with the overall width of the tool. The movable rotary blades ensure the controllability of the outlet of each flow channel in direct proportion to the volume of material flowing through it.

74 346 / BE

making the melt flow together at the same linear flow rate and pressure and in the desired width.

Since the melt flow properties and melt temperatures of the polymers are very variable, the use of the rotary blade tool has several advantages. The tool is suitable for heat insulating properties, so polymers with very different melt temperatures, for example up to 80 ° C, are co-processed.

In a rotary blade tool, each distribution line can be designed and configured for a specific polymer. Thus, the flow of each polymer is only influenced by the design of the distribution conductors and not by the forces exerted by the other polymers. This allows coextrusion of materials with very different melt viscosity into multilayer films. In addition, the rotor blade tool provides the ability to adjust the width of each distribution line so that an inner layer can be completely surrounded by the outer layers without leaving exposed edges. The aforementioned patents also describe the combined use of metering and rotary blade tools for producing more complex multilayer structures.

The multilayer films of the present invention may comprise two or more layers, at least one of which is an elastomer. It is contemplated that several elastomeric layers may be used, each elastomeric layer being attached to one or more topsheet. In a three-layer film, the middle layer 101 has opposite first and second sides, a side substantially aligned with one side of each outer topsheet 103 before the tension applied to the web. As shown in FIG. 4, the foil films as shown in FIG. 4 are preferably ···· films, such as the film 120 shown in FIG. 4, preferably comprising a middle elastomeric layer 101, which may comprise about 10 to 90% of the total thickness of the film. . The two outer layers 103 are generally, but not necessarily, identical, and may represent about 5-45% of the total thickness of the film. Although an elastomeric layer generally fits substantially to one or two topsheets without the use of adhesives, adhesives or bonding layers can be used to promote adhesion between the layers. The binding layers, if used, each have about 510% of the total thickness of the film.

After co-extruding the multilayer elastomeric film, it is preferably fed into a molding structure, where it is perforated and cooled to form a macroscopically porous, three-dimensional, perforated elastomeric web according to the invention. The film can generally be formed by dragging such a film against a molding screen or other molding device under vacuum and passing an air or water stream over the outward facing surface of the film. Such procedures are described in USP 4,342,314 and USP 4,154,240, cited above. The formatting of the three-dimensional elastomeric web may be otherwise terminated by using a liquid stream with sufficient force and mass flux, causing the web to be formatted as described by the USP.

4,695,422. Aiternative, the film can be formulated as described in USP 4,552,709. Preferably, the elastomeric foil is porously uniformly macroscopically and perforated so as to support the forming structure in a liquid differential pressure zone

74.346 / BE ·· · · · · ··· ··· · · · · · · · · · · · · · · · · · · · · · · · · by a stationary support element as described in USP 4,878,825 and

4,741,847.

Although not shown in the drawings, but with the method of the present invention using a conventional screening screen having a mesh-like supporting structure, the web of the invention may also be formed. The woven shaping sieve sieve knots give a macroscopically porous, three-dimensional web with a wavy pattern on the first surface, the pattern corresponding to the sieve knots. However, these wavy patterns generally remain in the plane of the first surface away from the plane of the second surface. The cross-section of the connecting elements is generally upwardly concave, and the connecting side walls of the connecting elements form secondary openings substantially in the plane of the second surface.

A particularly preferred molding device is a photomaterial laminated structure illustrated in Figure 15, which is an enlarged, partially segmented, perspective view of a photomicrated laminate structure of the type illustrated in FIG. The laminate 30 is preferably generally mentioned above

U.S. Pat. No. 4,342,314, and is comprised of individual layers 31, 32, and 33. Fig. 15 compared with the web 80 of Fig. 2 shows that the primary opening 71 in the plane 102 of the elastomeric web 80 corresponds to the aperture 61 in the uppermost plane 62 of the photomicrated laminate 30. Similarly, the opening 72 in the plane 106 of the elastomeric web 80 corresponds to the aperture 63 in the lowest plane of the photomicrated laminate structure 30.

74.346 / BE ··· · · · ··· · · · ··· · ···· · *

... ··· ···

The top surface of the photomicrated laminate 30 disposed in the uppermost plane 62 may be provided with protrusions 48 without departing from the scope of the invention.

This is preferably carried out by applying a resistive coating corresponding to the desired microscopic pattern of the surface aberrations on the upper side of the planar photovoltaic layer 31, and then starting a second photomarking process. The second photomarkage process results in a layer 31 having a microscopic pattern of protrusions 48 at the top surface of the interconnecting elements defining the pentagonal openings, e.g. The microscopic pattern of the protrusions does not substantially remove the first surface from the plane of the first surface. The first surface is detectable in a macroscopic order, while the protuberances can be detected in a microscopic order of magnitude. In the top layer, a laminate structure comprising such a pattern of protrusions 48 is generally described in the aforementioned patent application 4,463,045.

Methods for producing laminate structures of the type generally shown in Figure 2 are mentioned above

USP 4,342,3124. The photomicrated laminated structures are preferably wrapped by conventional methods generally into the tubular mold element 520 of FIG. 16, and its opposing ends are generally assembled in accordance with the instructions of USP 4,342,314 above, into a seamless tubular forming member 520.

The outermost surface 524 of the tubular forming member 520 is used to form the multilayer elastomeric web,

74.346 / BE ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · when contacting, while the innermost surface of the tubular member 522 does not contact the elastomeric web during the molding operation. In a preferred embodiment of the invention, the tubular member may be used as a molding surface as the recess / perforating roller forming surface 555 in a type of process described in detail in the above-mentioned USP 4,154,240. A particularly preferred device 540 of the type described in this patent is shown in Figure 17. This includes the recessing and perforating means 543, and the film 545 transmitting and winding the film, optionally substantially identical, and substantially identical to those of the apparatus described in USP 3,674,221. The frame, the supports, the holding means and the like, which must necessarily be provided with the functional elements of the device 540, are not shown in the figure and are not described in detail in order to simplify, illustrate and illustrate the invention. It should be noted that these details are obvious to those skilled in the mechanical processing of plastic films.

Briefly, the apparatus 540 shown schematically in FIG. 17 includes means for continuously receiving the strip of the thermoplastic film 550, for example from the coextruder 559, and processing it into a recessed and perforated film 551. The film 550 is preferably fed directly from the co-extruding operation while still above its thermoplastic temperature, thereby forming a vacuum before cooling. Alternatively, the film 550 may be heated by directing a hot air stream to the film by heating a hot air stream onto one of the surfaces of the film while vacuuming. applied to the opposite surface of the film. In order to properly control the film 550 to substantially avoid crimping and / or macroscopic stretching of the film, the apparatus 540 includes a means for maintaining a constant machine direction tension in the film in the direction of flow of the zone and in the opposite direction where the temperature is higher than the thermoplastic of the film. temperature, but in this zone the machine direction and transverse tension is substantially zero, which would stretch the film macroscopically. Tensioning is necessary to control and smooth the progressive tape of the thermoplastic film; the zero tension zone is the result of the film being in the zone at a sufficiently high temperature to allow the foil to be provided with holes and perforation.

As shown in FIG. 17, the recess 543 and the perforating device include a reinforced rotary recess / perforation roller 555 having closed ends 580 and comprising a non-rotating three-stage vacuum 556 manifold and optionally a hot air jet. service provider (not shown). The 556 three-stage distribution line combination includes distribution lines 561,562 and 563. Fig. 17 further shows a current-driven / cooling roller 566 and a soft surface (e.g., low density neoprene) roll 567 which rotates with the cooling roller. In short, in order to ensure (the device does not appear) to independently control the vacuum level in the three distribution lines, a thermoplastic foil tape that extends circumferentially

74.346 / BE ····

A portion of a recess / perforator roller 555 is periodically subjected to a first vacuum level with the distribution line 561, a second vacuum level with the distribution line 562, and a third vacuum level with the distribution line 563. As will be described in more detail below, the vacuum applied to the film with the distribution line 561 allows tension in the film in the direction opposite to the flow direction, the vacuum applied to the distribution line 562 allows the film to be perforated, and the vacuum applied by the distribution line 563 allows the film to cool the thermoplastic. below its temperature and allows it to flow in the flow direction. If desired, the surface of the film in contact with the surface of the recess / perforating roller 555 may be preheated before the vacuum distribution line 562 reaches the art, as is well known in the art (and therefore not visible), to facilitate a better fit of the flow-resistant polymers during the recess operation. The gap 570 between the cooler cylinder 566 and the soft surface roller 567 is loaded only nominally, as high pressure would smooth out the three-dimensional protuberances formed in the film as described above. However, even the nominal pressure in the gap 57 0 helps that the vacuum applied by the distribution line 563 isolates the flow tension (i.e. the tensioning of the roller roller) from the recess / perforation portion of the recess / perforator roller 555 and allows the slit 570 to slip disassemble the recessed and perforated film from the recess / perforator roller 555. Additionally, while the vacuum-induced ambient air passes through the film to the distribution line 563, it is 74.346 / BE ·· ·· ·! · •. · · ..::. ί: ··

.: .. .. ···: * The film is usually cooled below its thermoplastic temperature. The passage of the refrigerant on the cooling cylinder indicated by the arrows 573 and 574 in FIG. 17 allows the apparatus to handle thicker films or operate at higher speeds.

The recess and perforating device 543 includes a reciprocating / perforating roller 555 mounted on the rotatable device, a means (not shown) for rotating the roller 555, a controlled circumferential speed, a non-rotating three-stage vacuum manifold 556 in the recess / perforator cylinder 555, means. (not shown) for the application of vacuum controlled quantities in vacuum distribution lines 561, 562 and 563, which form a three-stage manifold 556 and optionally a hot air jet (not shown. The recess / perforating roll 555 may be constructed so as to be generally available). following the disclosures of USP 4,154,240, but replacing the perforated tubular molding surface described therein with a tubular laminated molding surface according to the invention.

In summary, the first vacuum distribution line 561 located in the recess / perforating roller 555 and the third vacuum distribution line 563 allow the substantially constant flow or reverse tension to be maintained in an intermediate strip of the film, while the intermediate portion of the film adjacent to the second vacuum distribution line 562 is provided with the recess 555. the perforating cylinder is subjected to tension that degrades heat and vacuum, causing the film to be deepened and perforated.

The photomicructured laminate structure described is advantageous in the art

Although it is generally described in the aforementioned USP 4,154,240, it is to be understood that the photomassaged molding structures according to the invention are equally easy to apply to the invention. directly to form a three dimensional plastic structure according to the invention. Such a process involves the use of a heated liquid plastic, typically a thermoplastic resin, directly on the molding surface, applying a sufficiently large pneumatic pressure difference to the heated liquid plastic to cause the material to adhere to the perforated laminate molding surface, allowing the liquid material to solidify, and then removing the three-dimensional plastic structure from the molding surface.

The web embodiment generally illustrated in FIG. 2 illustrates a particularly preferred embodiment of the invention, but any number of interconnecting elements may be used in the structures of the invention, such as secondary, tertiary, and the like. An example of such a structure is shown in Figure 18, which illustrates a variant of an upwardly concave cross-section of the connecting elements. The perforated mesh structure shown in Figure 18 includes the primary opening 301 formed by a plurality of primary connecting elements, such as 302, 303, 304, and 305, interconnected in the uppermost plane 307 of the web 300, further divided into smaller portions 310 and 305. 311 for secondary openings, the secondary connecting element 313 in the central plane 314. The secondary opening 310 is further divided by the tertiary connecting element 320 to a smaller secondary portion 321 and 322 in the lower plane 325 of the web 300. As shown in FIG. 19, taken along line 19-19 of FIG. 18, the planes 314 and 325 are generally located between the top plane 307 and the lowest plane 330 and are parallel thereto.

In the web embodiment shown in Figures 18 and 19, the primary and secondary connecting elements are further coupled to the intersecting tertiary connecting elements, such as the tertiary engagement elements 320, which generally also exhibit an upwardly concave cross-section along their lengths. The intersecting primary, secondary, and tertiary connecting elements terminate substantially parallel to the plane 330 of the second surface 332, forming a plurality of openings or perforations on the second surface of the web, such as openings 370, 371, and 372. It will be appreciated that the interconnecting primary, secondary and tertiary linking elements disposed between the first and second surfaces of the web 300 form a closed mesh structure connecting each of the primary openings, such as the primary openings 301 on the first surface of the web 331, on the second surface of the web 332. with a number of secondary openings, such as openings 370, 371 and 372.

It is contemplated that the generally concave-shaped connecting elements used in the webs of the invention may be substantially straight along their entire length. Alternatively, they may be curved, may contain two or more substantially straight segments, or may be otherwise oriented in any desired direction along any part of their length. It is not necessary that

74.346 / BE the connecting elements are identical. Additionally, the above-mentioned shapes can be combined in any desired manner to provide any desired pattern. Regardless of the shape finally chosen, the upwardly concave cross section along the respective lengths of the interconnected connecting elements helps to give the elastomeric webs of the invention flexibility and three dimensional state.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and subject matter of the invention. For example, if fabrics according to the invention are to be fabricated in which a predetermined portion of the web is capable of preventing fluid transfer, it is reasonable to perform the indentation operation without interrupting the second surface. U.S. Patent Nos. 4,395,215 and 4,747,991 describe in detail how to form tubular forming structures capable of producing three-dimensional porous films that are evenly recessed but perforated only in a predetermined area.

It is believed that the disclosure allows the practitioner to practice the invention in a number of different forms. The following exemplary embodiments and analytical methods are provided to illustrate the advantageous resilience of the particularly preferred low-stress, elastomeric materials of the present invention.

TEST METHODS

A. Tensile strength and elongation at break

74.346 / BE »· · ···« • «« · · · · · · ·

The properties determined by this method are related to the ductility (extensibility) of the elastomeric film. These properties are essential for the choice of material suitable for use as an elastic component of absorbent articles of the present invention, in particular panty liners, lined pants, disposable diapers fitted with fasteners, or other absorbent garments used by adults.

For the test, a commercial tensile tester can be used, from Instron Engineering Corp. Canton, MA or SINTECH-MTS Systems Corporation, Eden Prairie, MN. In the machine direction (MD = the machine direction of the film), 2.54 cm (1) wide and transverse (CD = the transverse direction of the foil at 90 ° from the machine direction) samples 10.16 cm (4) are cut out. The device is connected to a computer to control test speed and other test parameters, and to collect, calculate and report data. The tensile strength-elongation properties of the film are determined according to ASTM Method D 882-83. Tensile (elongation) properties are measured at room temperature (about 20 ° C). The procedure is as follows:

(1) selecting a suitable clamping jaw and a force cell for testing; the jaws must be wide enough to conform to the sample, typically using a wide jaw of 2.54 cm (1); the force cell is selected such that the elongation response from the test sample is between 25 and 75% of the capacity of the load cell or the applied load range, typically 50 important cells are used;

74.346 / BE (2) calibrate the device according to the manufacturer's instructions;

(3) adjusting the signal distance to 5.08 cm (2);

(4) placing the sample in the flat surface of the jaw jaw according to the manufacturer's instructions;

(5) adjusting the crosshead speed to a constant speed of 50.8 cm / min (20 min);

(6) starting the test and collecting the data at the same time; and (7) calculating and recording the elongation properties, such as elongation at break and 100% and 200% elongation. We mean the average of three samples.

B. Two-Cycle Hysteresis Test

The properties that are determined by this method may be related to the forces that the wearer perceives on the side panel, waistband, or other elastic members when starting to apply the product and the fit of the product after being placed.

For this test, a commercial test apparatus can be used, from Instron Engineering Corp., Canton MA, or SINTECH-MTS Systems Corporation, Eden Prairie, MN. In the machine direction, 2.54 cm wide and 10.16 cm long samples are cut from the film. The device is connected to a computer to control the test speed and other test parameters and to collect, calculate and report data. The two-cycle hysteresis was measured at room temperature. The procedure is as follows:

(1) suitable clamping jaws and force gauge cel74.346 / BE are selected for testing; the jaws must be wide enough to fit the sample, typically using 2.54 cm (1) wide clamping jaws; the force cell is selected such that the response from the test sample is between 25 and 75% of the capacity of the load cell or the applied load range, typically 50 important cells are used;

(2) calibrate the device according to the manufacturer's instructions;

(3) adjusting the signal distance to 5.08 cm (2);

(4) placing the sample in the flat surface of the jaw jaw according to the manufacturer's instructions;

(5) adjusting the crosshead speed to a constant speed of 50.8 cm / min (20 min);

(6) starting a two-cycle hysteresis test and collecting data at the same time, performing the two-cycle hysteresis test in the following steps:

the) we go at 200% speed; up to 50.8 cm / min.
b) this situation held for 30 seconds;
c) we go back at 0 speed; up to 50.8 cm / min
d) this situation held for 60 seconds;
e) we go at 50% speed; up to 50.8 cm / min.
f) this situation held for 30 seconds;
g) we go back to 0 % elongation; and

7) Calculate and report properties including

74.346 / BE tension reduction at 200% elongation and percentage deformation. The mean value of the three samples is reported.

C. Testing for sustained stress stress reduction

The properties determined by this method may be related to the forces the wearer perceives on the side panel, waistband or other elastic elements of the product, and the fit of the product at body temperature after wearing it for a specified period of time. The properties determined by this method are essential for the selection of materials that resist relaxation at a sustained load at body temperature (about 37, 7 ° C) and thus provide a durable fit over the maximum wear time of an absorbent article.

For commercial purposes, a commercial tachograph may be used from Instron Engineering Corp., Canton, MA, or SINTECH-MTS Systems Corporation, Eden Prairie, MN. 2.54 cm (1) wide in the machine direction and 5.08 cm (2) long transverse patterns are cut from the films. A sample distance of 2.54 cm (1) is selected in the sample, and the strips are wrapped around the pattern, with the signal distance apart, which provides a better surface for the jaws to grip. The device is connected to a computer for checking the test speed and other test parameters and for collecting, calculating and reporting data. The sustained stress tension reduction is measured at 37.7 ° C (100 ° F) (about body temperature).

The procedure is as follows:

(1) suitable clamping jaws and force gauge cel74.346 / BE are selected for testing; the jaws must be wide enough to fit the sample, typically using 2.54 cm (1) wide jaws; the force cell is chosen such that the response from the test sample is between 25% and 75% of the capacity of the load cells or the applied load range, typically 50 important cells are used;

(2) calibrate the device according to the manufacturer's instructions;

(3) adjusting the signal distance to 2.54 cm (1);

(4) placing the sample in the flat surface of the clamping jaw according to the manufacturer's instructions;

(5) adjusting the cross head speed to a constant speed of 25.4 cm / min (10 min);

(6) starting a stress test for sustained stress, and simultaneously collecting data for testing the sustained stress stress in the following steps:

the) we go at 200% speed; up to 25.4 cm / min.
b) this situation held for 30 seconds;
c) we go back at 0 speed; % elongation up to 25.4 cm / min
d) this situation held for 60 seconds;
e) we go at 50% speed; up to 25.4 cm / min.
f) this situation held for 10 hours; and
g) we go back to 0 % elongation; and

74.346 / BE • ·

7) calculate and report the properties including initial and final load (i.e., final permanent load) and% loss. The mean value of the three samples is reported.

The% loss is the voltage drop with a 10-hour sustained load, and this is expressed as:

[(initial load at 50% elongation for cycle 2 - final load at 50% elongation after cycle 2 after 10 hours) / initial load at 50% elongation for cycle 2] x 100.

Examples

Extrudable and moldable elastomeric compositions are prepared by styrene elastomer copolymer such as Kraton® G1600 series from Shell Chemical Company, Houston, TX, or SEPTON® S4000 or S8000 series from Kurary America, Inc. New York, NY, a vinyl arsenic resin, such as polystyrene PS 210 from Nova Chemical Inc. Monaca, PA, and mineral oil, such as Drakeol® from Pemzoil Co. Penrenco Div., Karns City, PA, form an elastomeric mixture.

Examples of elastomers useful in the present invention are shown in Table 1. The amount of each component is expressed as a percentage of the elastomer composition. Additives, specifically antioxidants, that are present in small amounts are

Are not listed in Table 1 formulations. The elastomer compositions useful in the present invention typically contain about 0.5% by weight of antioxidants.

Table 1

Elastomer preparations (% by weight)

74 346 / BE

Sample

SE-EP-S block copolymer Septon®S-4033 Polystyrene PS210 Piccotex® 120 Resin Kristalex 5140 Resin

Drakeol mineral oil

Table 2 illustrates the physical properties of single-layer films extruded from the elastomeric compositions of Table 1. The properties of the films were determined by the assay methods described above. All physical properties in Table 2 are given by the same square meter weight of the film samples. Table 2 shows that when polystyrene is replaced by lower molecular weight aromatic hydrocarbon resins, surprisingly, elastic and tension reduction properties are obtained even if the total weight percent of the composition of the three-dimensional composite mesh structure is also reduced.

Table 2

Properties of extruded films of elastomeric compositions

Sample 1 2 3 4
Weight per square meter (g / m 2 ) 70 70 70 70
Tension at 100% elongation (g / 2.54 cm) 183 226 182 179
Tension at 200% elongation (g / 2.54 cm) 267 261 252 266
Tension reduction at 200% elongation (%) 6 11 7 7

Deformation after a first cycle

At 200% elongation (%) 1321

Ultimate durable load

74 346 / BE

70 • · • · • • ·· · · · · · · · · · · · · · · · · · · · ·· · · · ·· · •
50% elongation (g / 2.54 cm) 86 68 74 82
Tension reduction is 10 hours long
at load (%) 27 43 35 28
% elongation at break 721 660 737 666

The physical properties of Formulation 1 of Table 3 are defined as the film of extruded monolayer elastomer as co-extruded multilayer film and as a three-dimensional vacuum-formed web.

A planar co-extruded multilayer film is produced and then converted to an elastomeric web by the methods described above, generally described in Figures 9-11. Figs. The coextruded film consists of three layers, as illustrated in Figure 4. The middle elastomer layer comprises a styrene triple block copolymer mixed with polystyrene and mineral oil and optionally aromatic hydrocarbon resins. The elastomer layer is typically about 0.052 mm (3.2 mils) thick. The topsheets are made of polyolefin materials and each is typically about 0.0038 mm (0.15 mils) thick. The total thickness of the film is approximately 0.09 mm (3.5 mi), where the elastomeric layer represents about 75-90% of the thickness. A single-layer elastomeric film is also prepared by methods generally known in the art, resulting in a thickness of about 0.072 mm (2.8 microns). Samples of appropriate size from the films were cut for the assay methods described above.

Although it is difficult to measure accurately, the thickness of the three-dimensional elastomeric web from the first surface to the second surface is of the order of 1 mm, the draw ratio is the stretch ratio of the web.

The ratio between the circumferential velocity of the dosing roller and the dosing roller) is approximately 10: 1. As is the case in a non-stretched configuration, a generally 1 mm square of the associated first surface forms a regular pattern of fluid passages, each side of the openings being about 1 mm apart. The secondary openings are slightly smaller than the primary openings, and an open opening area of about 12-16% is provided on the elastomeric web.

The exemplary elastomeric web of the present invention exhibited reliable elastic performance at repeated and sustained stretches of up to about 400% or more without significant effect on the elasticity or porosity of the web. The web has generally shown a higher modulus in the first stretch (tension) since the topsheet has undergone non-elastic stress. It is believed that microscopic creases were then formed on the connecting elements in the stretch regions of the non-elastic topsheet, resulting in a lower and generally constant modulus of the web.

Table 3

The elastomer properties of films / webs
Sample la lb juice
Weight per square meter (g / m 2 ) 71 89 88
Tension with 100% elongation (g / 2.54 cm) 186 293 258
Tension with 200% elongation (g / 2.54 cm) 271 346 307
Tension reduction 200% at elongation (%) 6 11 13

Deformation after a first cycle

At 200% elongation (%) 1 8 10

Final, sustained load at 50% elongation

74 346 / BE

a * «a · • · · · •
72 • ··· · ♦ a · · * ··
(g / 2.54 cm) 87 98 76
Tension reduction for 10 hours durable
at load (%) 27 33 33
% elongation at break 721 667 669
In the table, la sample one 1. composition extruded one
layered elastomeric film. The lb pattern coextruded multilayer head

wherein the middle layer is a composition of Formula 1 and the topsheets are made of polyethylene disposed on opposite sides of the middle layer. The sample is a three-dimensional elastomeric web formed by the methods described above, made of coextruded multilayer lb film.

All patent descriptions, patent applications (and patent patents derived therefrom, and corresponding, published patent applications) and publications cited herein are incorporated by reference. However, we do not explicitly recognize that any document that is incorporated by reference would describe or describe the invention.

Although specific embodiments of the invention have been illustrated and described, it will be apparent to those skilled in the art that various modifications and modifications may be made without departing from the spirit and object of the invention. Therefore, all modifications and modifications included in the appended claims are included within the scope of the present invention.

74 346 / BE

Claims (12)

  1. PATIENT INDIVIDUAL POINTS
    A low-stress elastomeric film suitable for forming a porous, macroscopically expanded, three-dimensional web, the elastomeric film comprising an elastomeric layer, opposite the first and second surfaces, and at least one substantially less elastomeric topsheet substantially conforming to the first surface of the elastomeric layer. ; the elastomer layer comprises:
    a) 20 to 80% by weight elastomeric block copolymer containing from 10 to 80% by weight of at least one hard block and from 20 to 90% by weight of at least two soft blocks;
    b) from 3 to 60% by weight of at least one vinylarene resin; and
    c) 5-60% by weight of processing oil; where the elastomeric film has a tensile decrease of less than 20% at 200% elongation at room temperature and a stress reduction of less than 45%, 10
    After X hours at 37.7 ° C (100 ° F) and 50% elongation.
  2. The film of claim 1, wherein the elastomeric layer comprises from 20 to 95% of the total thickness of the material and the topsheet comprises from 1 to 40% of the total thickness of the material.
  3. A film according to any one of the preceding claims, wherein the topsheet is a thermoplastic polymer such as polyolefin, ethylene copolymer, polystyrene, poly (α-methylstyrene), styrene random block copolymer, polyphenylene oxide or mixtures thereof.
  4. A film according to any one of the preceding claims, wherein the elastomeric block copolymer is an A-B-A triple block copolymer, A-B-A-B quad copolymer, A-B-A-B-A five block copolymer or
    74.346 / BE ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · '' · '' - 'mixtures' containing a mixture of vinyl-arene monomers or vinyl-arsenic and olefinic monomers. and a solid array from olefinic monomers B.
  5. A film according to any one of the preceding claims, wherein the vinyl arene monomer is styrene, α-methylstyrene, other styrene.
    derivatives or mixtures thereof, and the olefinic monomer is ethylene, propylene, butylene, isoprene, butadiene or mixtures thereof.
  6. A film according to any one of the preceding claims, wherein the number-average molecular weight of the hard block is from 1000 to 200,000, preferably from 2,000 to 100,000, and more preferably from 5,000 to 60,000, and the number average molecular weight of the soft array is from 1,000 to 300,000, preferably from 10,000 to 200,000, and more preferably from 20,000 to 200,000. 100,000.
  7. A film according to any one of the preceding claims, wherein the vinyl arene resin is styrene, α-methylstyrene, other styrene derivatives, vinyl toluene monomers or mixtures thereof; the number average molecular weight of the vinyl arene resin is 600200,000, preferably 5,000-150,000, and more preferably 10,000-100,000, and its glass transition temperature is 58-180 ° C, preferably 70-150 ° C, and more preferably 90-130 ° C.
  8. A film according to any one of the preceding claims, wherein the vinylarene resin is a mixture of a polystyrene and a low molecular weight aromatic hydrocarbon resin, wherein the ratio of polystyrene to low molecular weight aromatic hydrocarbon resin is 1: 10 to 10: 1, preferably 1: 4 -4: 1, - the number average molecular weight of polystyrene is 10,000-100,000, preferably 40,00060,000; and the number-average molecular weight of the aromatic hydrocarbon resin is from 600 to 10,000, preferably from 600 to 4.000.
    74.346 / BE ···· · 9. A film according to any one of the preceding claims, wherein the block copolymer is a styrene-olefin-styrene block copolymer such as styrene-butadiene-styrene (SBS), styrene-ethylene / butylene-styrene (S-EB-S), styrene-ethylene / propylene styrene ( S-EP-S), styrene-isoprene-styrene (SIS), hydrogenated polystyrene-isoprene / butadiene-styrene (S-IB-S) or mixtures thereof; vinyl-arene resin polystyrene; and processing oil mineral oil.
    Article 10, worn by a person on his body, has an elastic portion comprising a low-tension elastomeric film according to any one of the preceding claims.
    The article of claim 10 wherein the elastic portion is a bandage, bandage, absorbent article, or wound dressing.
    The article according to claim 10 or 11, which is an absorbent article, and the elastic portion of the absorbent article is a waistband, a side panel, a thigh collar, a topsheet or backsheet.
    The proxy:
    74 346 / BE
    KOZZETEVE ftr •? 4 «
    4-67 ON
    List of reference marks used Laminate structure Unique layer Unique layer Unique layer Polymer web openings Fiber elements Fiber elements Fiber elements Fiber elements Fiber elements protrusions The first surface of the web is the base of the fibrous element The surface of the first surface is the side wall of the fibrous elements The second surface of the fibrous elements The second surface of the fibrous elements The second surface of the fibrous elements is the second surface of the fibrous web surface plane surface aberrations openings top plane openings bottom flat primary openings secondary openings elastomeric webbing base side wall part second surface width size transition zone first surface interconnecting elements interconnecting elements interconnecting elements interconnecting elements interconnecting elements connecting element connecting element connecting element elastomeric layer surface of the first surface second surface plane molded film web primer slot connecting element coupling element connecting element for the top plane of the web ·· ·· secondary opening secondary opening secondary connecting element the middle plane of the web tertiary connecting element smaller secondary opening smaller secondary opening the lower plane of the web is the lowest plane of the web and the first surface of the web is the second surface of the web the second surface of the web is the secondary surface of the web secondary opening secondary opening diaper finishing edges backsheet longitudinal edges topsheet absorbent core liquid distribution element collector side panels one side strip of side panel another strip of side panel side guide edge
    425 binding region
    520 tubular molding element
    522 is the inner surface of the molding element
    524 is the outer surface of the molding element
    540 equipment
    543 recess and perforating device
    545 conveyor and winding device
    550 thermoplastic film tape
    551 recessed and perforated foil
    555 recess / perforating cylinder
    556 three-stage distribution line combination
    559 coextruders
    561 distribution line
    Distribution line 562
    563 distribution line
    566 Exhaust / Cooling Cylinder
    567 soft surface roller
    570 slots
    573 arrow
    574 arrow
    580 the closed ends of the cylinder
    74 346 / BE
    1/12 ···· * J
    261 ^ 0 Ζ •; ··· ··· · 74.346 / BE
    Fig. 2
    2/12 ·· · ···
    74 346 / BE
    ISO
    Fig. 3
    Fig. 4 · '* 74.346 / BE
    3/12
    Fig. 5
    86mi
    Fig. 6 <<<<<<<<< W
    Fig. 7
    4/12 ··· ·· · *. 1 ·· • : · ϊ · •. .. ···: · · ····· · * '74.346 / ΒΕ β5 Χ /
    Fig. 8Α
    102
    -WZ> Z> A>.
    106
    Fig. 8Β
    Fig. 8C · ♦ ** • · · · ···
    5/12
    74 346 / BE
    Fig. 9 • ··· · · · · · «·.« ·· ···
    6/12
    74 346 / ΒΕ
    Fig. 10 ”ß / 4 ·.
    34'6 / ΒΕ
    7/12
    Fig.11
    8/12 • 74 '
    3'45 / ΒΕ
    Fig.12
  9. 9/12 * 7 4? 34'6 / BE
    Fig.14
    422 • ·
  10. 10/12 • · · · · · · · · · · · · · · · · · · · ·
    74 ·. · 34 · 6 / ΒΕ
    Fig.15
  11. 11/12 * 7 4 *
    33F6 / BE
    570
  12. 12/12 ·· · · · · * 7 4 *.
    m / BE
    Fig.19
    332
HU0202695A 1999-09-17 2000-09-12 Low stress relaxation elastomeric materials HU0202695A3 (en)

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