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Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation

A technology for superabsorbent polymers and absorbent products, applied in absorbent pads, bandages, medical science, etc., can solve problems such as difficulty in obtaining superabsorbent polymer particles

Inactive Publication Date: 2011-05-11
PROCTER & GAMBLE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Furthermore, it is difficult to obtain superabsorbent polymer particles that are both hard enough to avoid gel blocking (sometimes called "gel strength") and have sufficient swelling capacity (sometimes called "gel volume")

Method used

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  • Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation
  • Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation
  • Absorbent articles comprising surface cross-linked superabsorbent polymer particles made by a method using vacuum ultraviolet radiation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0216] Base Polymer:

[0217] The water-swellable polymer described in Example 1.2 of WO 2005 / 014066 A1 entitled "Absorbent articles comprising coated water-swellable material" and filed on February 17, 2005 was used as matrix polymer. However, the amount of MBAA has to be regularly adjusted accordingly in order to obtain superabsorbent polymer particles having a centrifuge retention capacity value of 37.5 g / g as in the examples. It should be noted that the centrifuge retention capacity values ​​can in principle be adjusted in the same way as the CCRC method described in Example 1.2 of WO 2005 / 014066 A1.

[0218] The drum reactor used in the examples has a length of 40 cm and a diameter of 11 cm. The drum is made of glass, wherein the inner surface of the drum is slightly roughened. The roughness is adjusted to provide a one minute residence time of the superabsorbent polymer particles in the drum. The inner surface of the drum has an equally distributed roughness, ie all...

Embodiment 2

[0225] The superabsorbent polymer particles in Example 2 were fed sequentially through the drum 5 times, whereby all the superabsorbent polymer particles in the sample were re-fed into the drum immediately after they had left the drum . Thus, the superabsorbent polymer particles in Example 2 were irradiated for a total of five minutes.

[0226] The centrifuge retention capacity and saline flow conductivity values ​​of the initial superabsorbent polymer particles (ie, superabsorbent polymer particles before UV radiation) and superabsorbent polymer particles after UV radiation were determined according to the test methods listed above. The results are summarized in Table 1.

[0227] Table 1

[0228]

Material

mean radiation time

(minute)

centrifuge retention capacity

(g / g)

at 0.7kPa(0.1psi)

Saline flow conductivity

(10 -7 cm 3 sg -1 )

[0229] Superabsorption before radiation

polymer particles ...

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Abstract

The present invention relates to absorbent articles comprising surface cross-linked superabsorbent polymer (SAP) particles, the SAP particles being made by a method using UV irradiation. The method is carried out in a so-called drum reactor, which comprises a hollow drum and an irradiation source. The drum has a longitudinal axis and a cross-section. Superabsorbent polymer particles are fed into the drum and are irradiated while they move within the drum, which is rotated around its longitudinal axis. The irradiation source is provided such that the radiation emitted by the irradiation sourceis able to reach superabsorbent polymer particles within said drum. The irradiation source for use in the method of the present invention is able to emit UV radiation of a wavelength between 100 nm and 200 nm.

Description

technical field [0001] The present invention relates to absorbent articles comprising surface crosslinked superabsorbent polymer (SAP) particles produced by a process using ultraviolet (UV) radiation and carried out in a drum reactor. Background technique [0002] Superabsorbent polymers are well known in the art. They are commonly used in absorbent articles such as diapers, training pants, adult incontinence products and feminine care products to increase their absorbent capacity while reducing the overall bulk of these products. Superabsorbent polymers are capable of absorbing and retaining quantities of aqueous fluids many times their own weight. [0003] Commercial production of superabsorbent polymers began in Japan in 1978. Early superabsorbents were cross-linked starch-g-polyacrylates. In the commercial production of superabsorbent polymers, partially neutralized polyacrylic acid eventually replaced the nascent superabsorbent and has become the main polymer in supe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24B29C35/08C08J3/28A61L15/22
CPCB29C35/0266B29C35/0805B29C59/16B29C2035/0827C08J3/245C08J3/28C08J2300/14
Inventor 安德烈亚斯·弗洛尔托斯滕·林德纳埃丝特·奥利维罗斯三神吉郎
Owner PROCTER & GAMBLE CO
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