RU2242370C2 - Composite material for absorbing articles - Google Patents

Abstract

FIELD: sanitary and hygienic facilities.

SUBSTANCE: invention relates to composite materials for disposable absorbing articles used for moisture-absorbing and waterproof breast stomatological aprons, coverings, surgical aprons, bandaging facilities, and the like. Composite material consists of two layers: one layer is made in the form of fibrous layer containing thermoplastic synthetic fibers and the other in the form of microporous vapor-permeable and moistureproof film based on thermoplastic polymer. The layers are glued to each other locally by partially fused film polymer and polymer of thermoplastic fibers belonging to fibrous layer. The latter additionally contains 5 to 50% of cellulose-based fibers and surfactant preparation based on sorbitan derivatives selected from group: sorbitan-bis(polyoxyethylene) monooleate (Sorbital O), sorbitan-bis(polyoxyethylene) monostearate (Sorbital C), and pentaerythritol stearate polyethylene glycol ether in amounts 0.5 to 5 % on the dry weight.

EFFECT: improved consumer's quality of material.

8 cl, 1 dwg

Description

FIELD OF THE INVENTION

The invention relates to combined materials for absorbent articles of short-term use, used in the form of moisture-absorbing and waterproof breast dental wipes, bedspreads, surgical aprons, dressings, etc.

State of the art

A well-known series of laminated medical materials developed by researchers at the University of Tennessee based on heat-bonded disposable nonwoven fabric made from cotton and polypropylene fiber treated with fluorocarbon water-repellent compounds (see. Textile Technology Digest, 1995, No. 4, p. 45) . Having good vapor permeability, this material does not have sufficient moisture absorption due to the use of organofluorine preparations that hydrophobize the fibers of the material.

Known layered material used as the lower layer of baby diapers. The material contains a layer in the form of thermally bonded non-woven material made of polyolefin fibers, connected to a thermoplastic film.

This material is described in patent application EP No. 99660070, class. IPC B 32 V 27/12; D 04 N 13/00 V, publ. 11/10/1999.

However, the known material has insufficient water absorption and hygiene, because Made from 100% synthetic fibers.

The closest analogue of the proposed combined material for most similar essential features and for its intended purpose is the material described in the patent of Germany No. 19858567, class. IPC B 32 V 27/02; B 29 C 65/02 V; 32V 27 / 12V; 32V 5 / 26V; B 29 C 65/08 V, publ. 05/18/2000.

The material consists of at least two layers based on thermoplastic polymers. One of these layers is a fibrous layer of thermoplastic synthetic fibers, and the second can be made in the form of a microporous thermoplastic polymer film. Both layers are bonded to each other by a partially melted polymer film and fibers of the fibrous layer by heat bonding in local areas having the shape of an arc-shaped trough and giving the material a three-dimensional structure.

This material has moisture resistance, good vapor permeability, but insufficient absorbent properties, because the fibrous layer is made of synthetic fibers having a low hydrophilicity.

SUMMARY OF THE INVENTION

The objective of the invention is the creation of a combined material having a combination of moisture resistance, vapor permeability, high absorbency and non-toxicity, suitable for the manufacture of absorbent products.

The specified technical result is achieved due to the fact that in the combined material for absorbent products, including two layers, one of which is made in the form of a fibrous layer containing thermoplastic synthetic fibers, and the second is in the form of a microporous vapor-permeable, moisture-proof film based on a thermoplastic polymer, bonded between themselves in local areas partially melted by a polymer film and a polymer of thermoplastic fibers of the fibrous layer by means of heat bonding, fibrous with loya additionally contains 5-50 wt.% cellulose-based fibers and a surfactant based on sorbitan derivatives selected from the group: sorbitan bis (polyoxyethylene) monooleate (sorbital O); sorbitan bis (polyoxyethylene) monostearate (sorbital C); polyethylene glycol ether pentaerythritol stearate in an amount of 0.5-5 wt.% on a dry matter basis.

The fibrous layer of the composite material may contain cotton, linen and / or viscose fibers.

As thermoplastic synthetic fibers, the fiber layer may contain bicomponent fibers or staple synthetic fibers based on polyester or polypropylene.

The surface density of the fibrous layer may be in the range of 30-60 g / m ² .

As a microporous film, a film with a thickness of 10-40 microns can be used.

As a microporous thermoplastic film, a film based on polymers selected from the group: polypropylene, polyethylene, polyethylene terephthalate can be used.

The invention is illustrated by a schematic representation of the structure of the combined material in the drawing and examples.

The drawing schematically shows a cross section of a material according to the invention.

Information confirming the possibility of carrying out the invention

As shown in the drawing, the proposed combined material includes a thermoplastic polymer film 1 with micropores 2, bonded with partially melted polymer films and thermoplastic fibers of the fibrous layer 3 in local sections 4, which alternate with areas free from bonding 5.

When using the proposed material in various kinds of sanitary-hygienic products, the upper fibrous layer 3 absorbs liquid well and prevents its penetration through the material due to the protective effect of the hydrophobic vapor-permeable polymer film 1, through the micropores of which 2 gas exchange (shown by arrows) of the non-woven combined material and the environment . The presence of material free from bonding sections 5 provides the necessary softness and textile neck of the product.

A surface-active preparation, characterized by increased wetting ability and non-toxicity, is preferably introduced at the stage of preparation of the fiber mixture in an amount of 0.5-5 wt.% On a dry matter basis to the weight of the fiber layer.

The water resistance of the proposed material was evaluated according to its water resistance in accordance with GOST 3816-81 “Textile fabrics. Methods for the determination of hygroscopic and water-repellent properties. ” clause 6.4. “Determination of water resistance on a cough penetrometer”.

Depending on the polymer film used, the water resistance of the proposed material is in the range of 100-600 mm water column.

The absorbent properties of the combined material were determined in accordance with GOST 3816-81 “Textile fabrics. Methods for the determination of hygroscopic and water-repellent properties. ” Clause 7.1. “Determination of water absorption”.

Depending on the purpose, the rate of water absorption of the proposed material is at least 130%.

Sanitary-chemical, toxicological and hygienic tests of absorbent products were carried out in accordance with GOST RISO 10993 “Assessment of the biological effect of medical devices” and “Collection of guidelines, methodological materials for toxicological and hygienic studies of polymer materials and medical products based on them”.

The feasibility of the invention is illustrated by examples 1-5.

Example 1

A composite material was made including a fibrous layer with a surface density of 40 g / m ² from 70 wt.% Polyester fibers 0.17 tex 38 mm long and 30 wt.% Viscose fibers 0.31 tex 65 mm long. This layer is thermally bonded to a 10 micron thick polyester microporous film at local sites with partially fused polymer films and polyester fibers. The fibrous layer contains a surface-active non-toxic drug with increased wetting ability - sorbitan bis (polyoxyethylene) monooleate (sorbital O), known under the trade name Tween 80, in an amount of 1.5 wt.% On a dry matter basis. Combined material can be used to make breast dental wipes.

Example 2

A composite material was made including a nonwoven fabric with a surface density of 30 g / m ² from 50 wt.% Polypropylene fibers with a linear density of 0.17 tex 38 mm long and 50% cotton fibers with a linear density of 0.2 tex 38 mm long. This layer is thermally bonded with a polypropylene microporous film 30 microns thick in local areas with partially melted polymers of the film and polypropylene fibers and contains a surface-active non-toxic preparation with increased wetting ability - polyethylene glycol ether pentaerythritol stearate (trade name PP-40) in an amount of 0.5 wt. % dry matter. Combined material is used to make disposable bedding.

Example 3

A composite material was made including a nonwoven hydro-jet material with a surface density of 50 g / m ² containing 50 wt.% Polypropylene fibers with a linear density of 0.17 tex 65 mm long, 40 wt.% Viscose fibers with a linear density of 0.31 tex 65 mm long and 10% modified flax fiber. This layer is thermally bonded with a polyethylene microporous film 40 microns thick in local areas with partially melted polymers of the film and polypropylene fibers and contains a surface-active non-toxic preparation with increased wetting ability - sorbitan bis (polyoxyethylene) monostearate (sorbital C) in an amount of 3 wt.% Dry substance. Combined material is used to make dressings.

Example 4

A composite material was made including a fibrous nonwoven layer with a surface density of 60 g / m ² from 95 wt.% Polypropylene fibers with a linear density of 0.17 tex 38 mm long and 5 wt.% Viscose fibers with a linear density of 0.31 tex 65 mm long. The layer is thermally bonded to a 20 μm thick polyester film at local sites with partially melted film polymers and polyester fibers. The fibrous layer contains a surface-active non-toxic drug with increased wetting ability - sorbitan bis (polyoxyethylene) monooleate (sorbital O), known under the trade name Tween 80, in an amount of 5 wt.% On a dry matter basis. Combined material is used to make surgical aprons.

Example 5

A composite material was made, including a fibrous nonwoven layer with a surface density of 40 g / m ² from 30 wt.% Bicomponent polyester fibers with a linear density of 0.33 tex 65 mm long, 30 wt.% Polypropylene fibers with a linear density of 0.17 tex 65 mm and 40 wt.% viscose fibers with a linear density of 0.31 tex 65 mm long. The layer is thermally bonded with a polypropylene microporous film with a thickness of 15 μm in local areas of partially melted film polymers and bicomponent fibers. The fibrous layer contains a surface-active non-toxic drug with increased wetting ability - polyethylene glycol ether pentaerythritol stearate, known under the commercial name PP-40, in an amount of 1 wt.% On a dry matter basis. Combined material can be used for the manufacture of dressing medical devices.

Claims (8)

1. A combined material for absorbent products, including two layers, one of which is made in the form of a fibrous layer containing thermoplastic synthetic fibers, and the second is in the form of a microporous vapor-permeable, moisture-proof film based on a thermoplastic polymer, bonded together in local areas by partially melted polymer film and polymer of thermoplastic fibers of the fibrous layer by means of heat bonding, characterized in that the fibrous layer additionally contains 5-50 wt.% fibers cellulose-based and a surfactant based on sorbitan derivatives selected from the group: sorbitan bis (polyoxyethylene) monooleate (sorbital O), sorbitan bis (polyoxyethylene) monostearate (sorbital C), pentaerythritol stearate polyethylene glycol ether in an amount of 0.5-5 wt. .% dry matter. 2. The combined material according to claim 1, characterized in that the fibrous layer contains cotton fibers. 3. The combined material according to claim 1, characterized in that the fibrous layer contains linen and / or viscose fibers. 4. The combined material according to one of claims 1 to 3, characterized in that, as thermoplastic fibers, the fibrous layer contains staple synthetic fibers based on polyester or polypropylene. 5. The combined material according to one of claims 1 to 3, characterized in that it contains bicomponent synthetic fibers as thermoplastic synthetic fibers. 6. The combined material according to one of claims 1 to 5, characterized in that the surface density of the fibrous layer is in the range of 30-60 g / m ² . 7. The combined material according to claim 1, characterized in that a film based on polymers selected from the group: polypropylene, polyethylene, polyethylene terephthalate is used as a microporous film. 8. The combined material according to one of claims 1 to 7, characterized in that the thickness of the microporous film is 10-40 microns.