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EP-4137110-B1 - SUPERABSORBENT POLYMER FILM AND ABSORBENT PRODUCT COMPRISING SAME

EP4137110B1EP 4137110 B1EP4137110 B1EP 4137110B1EP-4137110-B1

Inventors

  • YOON, Kiyoul
  • SHIN, MYOUNGJIN
  • KANG, Seongkyun
  • KIM, YU JIN
  • KIM, Gicheul

Dates

Publication Date
20260513
Application Date
20220321

Claims (9)

  1. A super absorbent polymer film having a thickness of 500 µ m or less and moisture absorption of 10 to 100 g/m 2 measured according to KS F 2611 standard, wherein a moisture content is 1 to 15% and a tensile strength is 5 to 50 MPa, measured according to the method of the present application.
  2. The super absorbent polymer film of Claim 1, wherein the thickness is 10 to 200 µ m.
  3. An absorbent article comprising a liquid impermeable back sheet; a breathable waterproof film; an absorbent material containing a super absorbent polymer powder and pulp; and a liquid permeable top sheet, wherein the super absorbent polymer film of Claim 1 is included between the liquid impermeable back sheet and the breathable waterproof film and/or between the breathable waterproof film and the absorbent material.
  4. The absorbent article of Claim 3, wherein the super absorbent polymer film is laminated on one side of the liquid impermeable back sheet; and/or on one side or both sides of the breathable waterproof film.
  5. The absorbent article of Claim 3, wherein the super absorbent polymer film is laminated on one side of the breathable waterproof film, and air permeability of the laminated super absorbent polymer film and breathable waterproof film is 3000 to 5000 g/m 2 ·24hr.
  6. The absorbent article of Claim 3, wherein the liquid impermeable back sheet is a nonwoven fabric having a pore size of 20 to 1000 µ m.
  7. The absorbent article of Claim 3, wherein the breathable waterproof film has air permeability of 2000 to 5000 g/m 2 ·24hr.
  8. The absorbent article of Claim 3, wherein the absorbent material contains 10 to 90 wt% of the super absorbent polymer powder.
  9. The absorbent article of Claim 3, wherein the liquid permeable top sheet has a basis weight of 15 to 30 g/m 2 .

Description

[TECHNICAL FIELD] Cross-reference to Related Application(s) This application claims the benefit of Korean Patent Applications No. 10-2021-0039666 filed on March 26, 2021 and No. 10-2022-0034232 filed on March 18, 2022 with the Korean Intellectual Property Office. The present disclosure relates to a super absorbent polymer film having excellent moisture absorption and to an absorbent article excellent in feeling with improved external dampness by including the super absorbent polymer film. The invention is represented by the appended claims. [BACKGROUND OF ART] Absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads generally include a liquid impermeable back sheet, an absorbent material, and a liquid permeable top sheet in contact with wearer's skin. If necessary, they may further include a breathable waterproof film for improving air permeability, a decorative sheet for improving the appearance, and elastic leg cuffs for improving fit and preventing side leakage. In such absorbent articles, a material that allows body fluids to pass through the absorbent material quickly such as a synthetic polymer nonwoven fabric is used as the liquid permeable top sheet. The absorbent material is made of a super absorbent polymer, pulp, tissue, or nonwoven fabric, and functions to quickly absorb and retain the body fluids that have passed through the liquid permeable top sheet. The liquid impermeable back sheet prevents the body fluids absorbed by the absorbent material from leaking out, and a woven or nonwoven fabric made of natural or synthetic fibers is used. The liquid impermeable back sheet is basically designed to be waterproof, but when waterproofing is too good, water vapor and air do not permeate, so there is a problem in that wearability is deteriorated. Accordingly, the liquid impermeable back sheet is usually made of a moisture permeable waterproof woven or nonwoven fabric having pores with a size that is impermeable to water particles and is permeable to smaller water vapor particles. However, due to the moisture permeability of the back sheet, moisture emitted from the absorbent material is transmitted to the outside of the back sheet. Thus, when worn for a long time, moisture is felt even outside the absorbent article, which worsens the feeling during use. KR 2015 0037683A relates to superabsorbent resin composite used for preparing personal care absorbent product, comprises superabsorbent resin and sheet which is adjacent to resin. [DETAILED DESCRIPTION OF THE INVENTION] [Technical Problem] In order to solve the above problems, there are provided a thin super absorbent polymer film having excellent moisture absorption, and an absorbent article having improved external dampness by including the super absorbent polymer film. [Technical Solution] According to an embodiment of the present disclosure, there is provided a super absorbent polymer film having a thickness of 500 µm or less and moisture absorption of 10 to 100 g/m2 measured according to KS F 2611 standard. The super absorbent polymer film may have the thickness of 10 to 200 µm. The super absorbent polymer film has a moisture content of 1 to 15% and a tensile strength of 5 to 50 MPa. According to another embodiment of the present disclosure, there is provided an absorbent article including a liquid impermeable back sheet; a breathable waterproof film; an absorbent material containing a super absorbent polymer powder and pulp; and a liquid permeable top sheet, wherein a super absorbent polymer film is included between the liquid impermeable back sheet and the breathable waterproof film and/or between the breathable waterproof film and the absorbent material, andthe super absorbent polymer film has a thickness of 500 µm or less and moisture absorption of 10 to 100 g/m2 measured according to KS F 2611 standard. The super absorbent polymer film may have the thickness of 10 to 200 µm. The super absorbent polymer film may be laminated on one side of the liquid impermeable back sheet; and/or on one side or both sides of the breathable waterproof film. For example, the super absorbent polymer film is laminated on one side of the breathable waterproof film, and air permeability of the laminated super absorbent polymer film and breathable waterproof film may be 3000 to 5000 g/m2·24hr. The liquid impermeable back sheet may be a nonwoven fabric having a pore size of 20 to 1000 µm. The breathable waterproof film may have air permeability of 2000 to 5000 g/m2·24hr. The absorbent material may contain 10 to 90 wt% of the super absorbent polymer powder. The liquid permeable top sheet may have a basis weight of 15 to 30 g/m2. [ADVANTAGEOUS EFFECTS] The super absorbent polymer film of the present disclosure is very thin and has excellent moisture absorption, so it can be suitably used for articles requiring a moisture absorption function. In addition, the absorbent article of the present disclosure includes the super absorbent polymer fi