GB1569336A - Absorbent procuct and its use in sanitary articles - Google Patents

Absorbent procuct and its use in sanitary articles Download PDF

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Publication number
GB1569336A
GB1569336A GB42460/77A GB4246077A GB1569336A GB 1569336 A GB1569336 A GB 1569336A GB 42460/77 A GB42460/77 A GB 42460/77A GB 4246077 A GB4246077 A GB 4246077A GB 1569336 A GB1569336 A GB 1569336A
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sheet
product according
water
absorbent
sheets
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GB42460/77A
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Kao Corp
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Kao Corp
Kao Soap Co Ltd
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/04—Layered products comprising a layer of paper or cardboard next to a particulate layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/5323—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having absorbent material located in discrete regions, e.g. pockets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53445—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad from several sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins

Description

(54) ABSORBENT PRODUCT AND ITS USE IN SANITARY ARTICLES (71) We, KAO SOAP CO. LTD.. a Japanese Company. of 1, 1-chome, Nihonbashi Kayabacho, Chuo-ku, Tokyo, Japan, do hereby declare the invention, for which we pray that a Patent may be granted to us, and the method by which it is to be performed. to be particularly described in and by the following statement: The present invention relates to absorbent products containing a water-insoluble spontaneously crosslinked polyacrylic acid salt as a component thereof. such as babies paper nappies, sanitary towels for menstrual discharges and body fluid absorbing dressings for medical or surgical use.
As absorbent materials, in the above products, there have been used cotton, rayon padding, cellulosic pulp chips and crepe paper. However. the absorption capacity per unit weight of these absorbent materials is low, the products are bulky and not convenient to carry, sometimes problems occur in disposing of them and in use they can be inconvenient.
Further, because of their low absorbing capacity and low occluding capacity absorbed liquid may ooze out of the absorbent material to wet the skin undesirably if pressure due to the body weight is applied to them during their use. Although numerous proposals for utilizing various polymers as highly absorbent substances for absorbent products have been made, no satisfactory technique has yet been found.
The present invention provides an absorbent product comprising a water-insoluble, spontaneously crosslinked polyacrylic acid salt supported bv a base and covered by a layer of paper or non-woven fabric.
The spontaneously crosslinked polyacrylic acid salt used in the present invention can be prepared by, for example, the following process. An aqueous solution containing more than 40 wt. % of an alkali metal salt of acrylic acid and containing a water-soluble free radical polymerization initiator, such as potassium persulfate. is dispersed in a liquid aliphatic hydrocarbon solvent, such as n-hexane. in the presence of a sorbitan fatty acid ester (such as sorbitan monostearate) having an HLB value (hydrophilic-lipophilic balance) of 3 to 6 to obtain a water-in-oil suspension: the suspension is subject to polymerization in the absence of a crosslinking agent; the solvent and water are removed: and the product is dried to obtain the dry polymer.
The preparation of the polymer is decribed in more detail in our copending British Patent Application Number 39966i77 Serial No 1569331.
The spontaneously crosslinked polyacrylic acid salt is remarkably different in its physical propertles from the conventional polyacrylic acid salts (linear polyacrylic acid salts or polymers obtained by crosslinking the linear polyacrvlic acid salts with a crosslinking agent). As the spontaneously crosslinked polyacrylic acid salts of the present invention, those having an absorbing capacity of more than 4()() g per gram of the polymer are preferred. The spontaneously crosslinked polyacrylic acid salts used according to the present invention are preferably alkali metal salts, particularly sodium salts.
The spontaneously crosslinked polyacrylic acid salts employed in the present invention have the following characteristics features (1) to (4) and they provide excellent absorbent products when they are used in combination with absorbents such as cellulosic pulp chips, cellulosic powders and crepe papers: (I) A high absorbing capacity and it quid retaining capelcirv The liquid absorbing capacities of samples used for absorbing an artificial urine comprised of 2.0% of urea, 1.OC of sodium chloride. ().()6'at of calcium chloride, 0. 15 of magnesium sulfate (heptahydrate) and the remainder consisting of deionized water were measured. The results shown in Tables 1 and 2 were obtained.
Samples: (A) Spontaneously crosslinked sodium polyacrylate.
(B) Partial saponification product of starch/polyacrylonitrile graft polymer.
(C) Calcium salt of carboxymethylcellulose.
(D) Sodium alginate, (E) Linear sodium polyacrylate.
(F) Pulp chips, (G) Crepe paper, and (H) Absorbent cotton according to the Pharmacopoeia of Japan.
Methods of Measurement 1. "Tea Bag" method: The sample is wrapped in a non-woven fabric and immersed in the artificial urine for 10 minutes. Then. it is drained for 30 minutes and weighed to determine its change in weight.
The sample is then sandwiched between upper and lower filter papers and the assemblv is placed between plastics plates. A predetermined pressure is applied downwardly for three minutes. Immediately thereafter, the sample is weighed again to determine the quantity of artificial urine remaining absorbed therein.
2. Mesh filtration method: 0.5 Gram of the sample is dispersed throughly in 300 g of deionized water. After allowing the dispersion to stand for 10 minutes, the dispersion is filtered through an 8U mesh wire gauze filter. The quantity of the deionized water that passed through the filter is measured to determine the quantity of water absorbed therein. In a test in which the artificial urine is used, 1.0 g of the sample is dispersed in 100 g of the artificial urine and the quantity of liquid absorbed is determined in the same manner as above.
Results 1. The amount of absorbed artificial urine according to the "tea bag" method is given in Table 1: TABLE 1 Units: g [artificial urine jig sample Amount of urine remaining absorbed under the following pressure Sample 0 g/cm 15 glcm 45 gicm (no pressing) A 35 34 32 B 25 14 12 C 13 6 4 D 20 16 13 E 18 17 16 F 9 4 3 G 9 1 ().7 H 12 1 0.5 2. The amount of liquid absorbed according to mesh filtration method is given in Table 2: TABLE 2 Units: g [waterj/g [samplel Amount of absorbed liquid Sample Artificial Urine Deionized water A 45 470 B 30 130 C 17 20 D 26 0 E 0 = F 13 13 G 11 11 H 15 15 As compared with other substances, polymer (A). has a high absorbing capacity and this is not greatly reduced even when the polymer is subjected to pressure.
Sample (D) is a highly viscous gel.
(11) Physical constitution The granules of the spontaneously crosslinked polyacrylic acid salts are preferably spherical and their surfaces are preferably covered by an oil-soluble surface active agent (i.e. the sorbitan fatty acid ester having HLB of 3 to 6).
Due to this oil-soluble surface active agent. the particles have an oleophilic coating and so the inter-adhesive power of the particles is low after the polymer is wetted with water and then dried. An absorbent product in sheet form. prepared bv placing the polymer between two sheets of paper or non-woven fabric and sticking the polymer to the sheets by the wet process (applied as a dispersion of the particles in water). has a very high flexibilitv because of the poor interadhesion of the polymer particles. Absorptive sheets prepared from the polymers (B) and (C), as described above. in the same manner are on the other hand quite rigid. (Refer to Example 1).
(111) High safety The high safety of sodium polyacrylate for human use has been recognized and sodium polyacrylate has been approved as a food additive and as a basic raw material for cosmetics.
Further, the spontaneously crosslinked polyacrylic acid salt employed in the present invention is free from crosslinking agent and the onlv additive that it contains. is the sorbitan/fatty acid ester emploved as an emulsifier during the polymerization. The sorbitan fatty acid ester has been approved as a food additive.
The polymer used in the present invention having such characteristic properties can be used in combination with other synthetic or natural high molecular weight compounds.
(IV) Insolubility in water The spontaneously crosslinked sodium polvacrvlate emploved in the present invention is water-insoluble and, therefore. after absorption of an aqueous liquid. its viscosity still remains low and the sodium polyacrvlate in the form of plastic gel is easily dispersed in water, whereas a water soluble polymer exhibits a high viscositv and the latter is dispersible in water only with difficulty The following examples illustrate the structure of the absorbent product of the present invention and the processes for preparing same. with reference to the following drawings. in which: Figures 1 to 6 are cross sections showing various absorbent products of the present invention.
Example 1 Spontaneously crosslinked sodium polvacrvlate powder (hereinafter referred to as "polymer powder") 5 is spread uniformlv on a sheet I of a paper or non-woven fabric as shown in Figure 1 The amount of the polymer powder applied is 1() glum' to 200 gim-.
preferably 30 g/m2 to 120 gim. Another sheet I of the paper or non-woven fabric is placed thereon and then a small amount of water is spraved thereon or steam is applied thereto and the assembly is dried. The two lavers 1. 1 of the paper or non-woven fabric are adhered to each other by the previouslv wetted polymer powder 5. I hus. an absorbent product in the form of sheet having a high pliabilitv is obtained Absorbent bodies in the form of sheets containing sample (B) and (D) were prepared in the same manner and the pliabilities of them were determined by the cantilever method. The following results were obtained: Sample Pliability (length) Sheet containing (A) 52 mm (pliable) Sheet containing (B) 110 mm (rigid) Sheet containing (D) 143 molts (rigid) Non-woven fabric (two sheets 1) 45 mm (pliable) Water-absorbing paper (two sheets 1) 48 mm (pliable) As compared with sheets containing (B) and (D), the sheets according to the present invention containing polymer (A) are far more pliable.
Example 2 A mixture of cellulose pulp chips or cellulose powder 3 and the polymer powder 5 in the form of a sheet is placed between upper and lower lavers I of paper or non-woven fabric as shown in Figure 2. Both ends thereof are sealed bv an adhesive to obtain a highly pliable absorbent body in the form of a sheet.
Example 3 Spontaneously crosslinked sodium polyacrylate powder 5 is dispersed uniformly on a cellulosic pulp chip layer 3 applied to a base 2 as shown in Figure 3. Additional pulp chips 3 are piled up thereon and the assembly is wrapped in a polyethylene sheet 6 (the bottom) and a non-woven fabric 1 (the top). A sheet of crepe paper 4 can be placed between the polymer powder 5 and the upper pulp chip layer 3. This structure is suitable mainly as a disposable nappy.
Example 4 Spontaneously crosslinked sodium polyacrylate powder 5 is dispersed uniformly on pulp chips 3 covering a base 2. then 1-10 sheets. preferably 3-6 sheets. of crepe paper 4 are laminated thereon; a water-proof paper or a polyethylene sheet 6 is placed on the crepe paper 4 and a rayon staple padding 7 is placed below the pulp chips 3 to form a laminate: and the whole is wrapped in a non-woven fabric 1 as shown in Figure 4. This structure is suitable mainly for feminine sanitary towels.
Example 5 The absorbent products shown in Figures 5 and 6 comprise the absorbent sheet material shown in Example 1 combined with another absorbent material 8. By controlling the density of the polymer powder 5 in the absorbent sheet material. a liquid absorbed through the top can pass therethrough smoothly during use and. thereafter. even if pressure is applied vertically. oozing of the liquid from the lower laver can be substantiallv prevented.
The polymer density in this case is O., to 1.0 y/1()() cm. preferably 0.3 to ().7 g/1(?() cm2.
WHAT WE CLAIM IS: 1. A product for absorbing aqueous liquid comprising. a water-insoluble. spontaneously crosslinked polyacrylic acid salt supported by a base and covered by a layer of paper or non-woven fabric.
2. A product according to Claim 1. wherein the polvacrylic acid is mixed with cellulosic powder or cellulosic pulp chips.
3. A product according to Claim 1 or Claim 2, wherein the spontaneously crosslinked polyacrylic acid salt is an alkali metal salt.
4. A product according to Claim 3. wherein the alkali metal is sodium.
5. A product according to any preceding Claim. wherein the spontaneously crosslinked polyacrylic acid salt has a water absorbing capacity higher than 400 g per gram of the polyacrylic acid salt.
6. An absorbent product according to any preceding Claim. wherein the spontaneously crosslinked polyacrylic acid salt is prepared by dispersng an aqueous solution of an alkali metal salt of acrvlic acid having a concentration of higher than 40 wt. C, and containing a water-soluble free radical polymerization initiator in a liquid aliphatic hvdrocarbon solvent, and in the presence of a sorbitan fatty acid ester having a HLB value of 3 to 6 to obtain a water-in-oil suspension. subjecting the suspension to polvmerization in the absence of a crosslinking agent removing the solvent and water therefrom and drying the product to obtain the polymer.
7. A product according to any preceding Claim. in which the polvacrylic acid salt is enclosed by a cover which is at least partiallv composed of a porous sheet.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. containing sample (B) and (D) were prepared in the same manner and the pliabilities of them were determined by the cantilever method. The following results were obtained: Sample Pliability (length) Sheet containing (A) 52 mm (pliable) Sheet containing (B) 110 mm (rigid) Sheet containing (D) 143 molts (rigid) Non-woven fabric (two sheets 1) 45 mm (pliable) Water-absorbing paper (two sheets 1) 48 mm (pliable) As compared with sheets containing (B) and (D), the sheets according to the present invention containing polymer (A) are far more pliable. Example 2 A mixture of cellulose pulp chips or cellulose powder 3 and the polymer powder 5 in the form of a sheet is placed between upper and lower lavers I of paper or non-woven fabric as shown in Figure 2. Both ends thereof are sealed bv an adhesive to obtain a highly pliable absorbent body in the form of a sheet. Example 3 Spontaneously crosslinked sodium polyacrylate powder 5 is dispersed uniformly on a cellulosic pulp chip layer 3 applied to a base 2 as shown in Figure 3. Additional pulp chips 3 are piled up thereon and the assembly is wrapped in a polyethylene sheet 6 (the bottom) and a non-woven fabric 1 (the top). A sheet of crepe paper 4 can be placed between the polymer powder 5 and the upper pulp chip layer 3. This structure is suitable mainly as a disposable nappy. Example 4 Spontaneously crosslinked sodium polyacrylate powder 5 is dispersed uniformly on pulp chips 3 covering a base 2. then 1-10 sheets. preferably 3-6 sheets. of crepe paper 4 are laminated thereon; a water-proof paper or a polyethylene sheet 6 is placed on the crepe paper 4 and a rayon staple padding 7 is placed below the pulp chips 3 to form a laminate: and the whole is wrapped in a non-woven fabric 1 as shown in Figure 4. This structure is suitable mainly for feminine sanitary towels. Example 5 The absorbent products shown in Figures 5 and 6 comprise the absorbent sheet material shown in Example 1 combined with another absorbent material 8. By controlling the density of the polymer powder 5 in the absorbent sheet material. a liquid absorbed through the top can pass therethrough smoothly during use and. thereafter. even if pressure is applied vertically. oozing of the liquid from the lower laver can be substantiallv prevented. The polymer density in this case is O., to 1.0 y/1()() cm. preferably 0.3 to ().7 g/1(?() cm2. WHAT WE CLAIM IS:
1. A product for absorbing aqueous liquid comprising. a water-insoluble. spontaneously crosslinked polyacrylic acid salt supported by a base and covered by a layer of paper or non-woven fabric.
2. A product according to Claim 1. wherein the polvacrylic acid is mixed with cellulosic powder or cellulosic pulp chips.
3. A product according to Claim 1 or Claim 2, wherein the spontaneously crosslinked polyacrylic acid salt is an alkali metal salt.
4. A product according to Claim 3. wherein the alkali metal is sodium.
5. A product according to any preceding Claim. wherein the spontaneously crosslinked polyacrylic acid salt has a water absorbing capacity higher than 400 g per gram of the polyacrylic acid salt.
6. An absorbent product according to any preceding Claim. wherein the spontaneously crosslinked polyacrylic acid salt is prepared by dispersng an aqueous solution of an alkali metal salt of acrvlic acid having a concentration of higher than 40 wt. C, and containing a water-soluble free radical polymerization initiator in a liquid aliphatic hvdrocarbon solvent, and in the presence of a sorbitan fatty acid ester having a HLB value of 3 to 6 to obtain a water-in-oil suspension. subjecting the suspension to polvmerization in the absence of a crosslinking agent removing the solvent and water therefrom and drying the product to obtain the polymer.
7. A product according to any preceding Claim. in which the polvacrylic acid salt is enclosed by a cover which is at least partiallv composed of a porous sheet.
8. A product according to any preceding Claim which is a disposable nappy.
9. A product according to any preceding Claim, which is a feminine sanitary towel.
10. A product according to Claim 1, which is a medical or surgical dressing.
GB42460/77A 1976-10-26 1977-10-12 Absorbent procuct and its use in sanitary articles Expired GB1569336A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12849176A JPS5355260A (en) 1976-10-26 1976-10-26 Absorber

Publications (1)

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GB1569336A true GB1569336A (en) 1980-06-11

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GB42460/77A Expired GB1569336A (en) 1976-10-26 1977-10-12 Absorbent procuct and its use in sanitary articles

Country Status (7)

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JP (1) JPS5355260A (en)
AU (1) AU508232B2 (en)
DE (1) DE2746649C2 (en)
FR (1) FR2368994A1 (en)
GB (1) GB1569336A (en)
HK (1) HK19181A (en)
MY (1) MY8100277A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260566A1 (en) * 1986-09-17 1988-03-23 Kao Corporation Absorbent article
WO1990004456A1 (en) * 1988-10-19 1990-05-03 John Kenneth Bethune Superabsorbant package

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JPS5522026A (en) * 1978-07-28 1980-02-16 Kao Corp Disposable diaper
JPS5525005U (en) * 1978-08-02 1980-02-18
NZ191703A (en) * 1978-10-05 1981-12-15 Unilever Ltd Absorbent material surface treated with aliphatic hydrocarbon or nonionic derivative thereof
JPS5589438U (en) * 1978-12-15 1980-06-20
JPS55126821U (en) * 1979-03-02 1980-09-08
JPS55126820U (en) * 1979-03-02 1980-09-08
EP0030342A3 (en) * 1979-12-10 1984-10-17 Henkel Kommanditgesellschaft Auf Aktien Process for the manufacture of a hygienic article
JPS56147630A (en) * 1980-04-15 1981-11-16 Seitetsu Kagaku Co Ltd Water absorptivity imparting method
BR8108591A (en) * 1980-05-12 1982-04-06 Johnson & Johnson ABSORBENT COMPOSITION
JPS6045017U (en) * 1983-09-05 1985-03-29 和商株式会社 disposable diapers
JPS60160954A (en) * 1984-01-31 1985-08-22 株式会社ハ−マン Contraceptive instrument
US4985023A (en) * 1988-05-09 1991-01-15 Dow Corning Corporation Antimicrobial superabsorbent articles
US5149335A (en) * 1990-02-23 1992-09-22 Kimberly-Clark Corporation Absorbent structure
CA2058685A1 (en) * 1991-01-11 1992-07-12 Yoji Fujiura Gelling material and gelling method
DE4344224A1 (en) * 1993-12-23 1995-06-29 Stockhausen Chem Fab Gmbh Crosslinked synthetic polymers with porous structure, high absorption rate for water, aqueous solutions and body fluids, a process for their preparation and their use for the absorption and / or retention of water and / or aqueous liquids
DE4420088C3 (en) * 1994-06-09 2001-02-15 Stockhausen Chem Fab Gmbh Process for producing a water-absorbing fabric and its use
JP4628144B2 (en) * 2005-03-07 2011-02-09 花王株式会社 Absorber manufacturing method

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US3670731A (en) * 1966-05-20 1972-06-20 Johnson & Johnson Absorbent product containing a hydrocolloidal composition
US3669103A (en) * 1966-05-31 1972-06-13 Dow Chemical Co Absorbent product containing a hydrocelloidal composition
US3661815A (en) * 1970-05-18 1972-05-09 Grain Processing Corp Water-absorbing alkali metal carboxylate salts of starch-polyacrylonitrile graft copolymers
JPS5146356B2 (en) * 1973-02-13 1976-12-08

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260566A1 (en) * 1986-09-17 1988-03-23 Kao Corporation Absorbent article
WO1990004456A1 (en) * 1988-10-19 1990-05-03 John Kenneth Bethune Superabsorbant package

Also Published As

Publication number Publication date
FR2368994B1 (en) 1982-02-05
DE2746649A1 (en) 1978-04-27
MY8100277A (en) 1981-12-31
AU508232B2 (en) 1980-03-13
JPS5355260A (en) 1978-05-19
DE2746649C2 (en) 1983-08-11
HK19181A (en) 1981-05-15
AU2979477A (en) 1979-05-24
FR2368994A1 (en) 1978-05-26
JPS5756561B2 (en) 1982-11-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19971011