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公开(公告)号：US10323105B2
公开(公告)日：2019-06-18
申请号：US15324764
申请日：2014-11-04
IPC分类号： C08F20/06 , C08J3/24 , C08F8/14 , A61F13/49 , A61F13/53 , C08F2/32 , A61L15/60 , C08F8/00 , C08F220/06 , A61L15/24 , B01J20/26
摘要： Provided are: a water-absorbent resin which, when used as an absorbent material, retains a high water-absorption performance, increases the diffusivity of a to-be-absorbed liquid and makes it possible to effectively decrease the amount of re-wet; and an absorbent article formed using an absorbent material including the water-absorbent resin. The water-absorbent resin according to the present invention is a water-absorbent resin obtained by polymerizing a water-soluble ethylenically monomer in the presence of an internal-crosslinking agent and thereafter post-crosslinking the polymer with a post-crosslinking agent, characterized in that when subjected to a liquid flow test, the water-absorbent resin has an effective absorbent material index (K) indicated by equation (I) of 250 or greater. Effective absorbent material index (K)=[(the amount of liquid flow) (g)]×[(artificial-urine absorption ratio) (g/g)] (I)
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公开(公告)号：US09925294B2
公开(公告)日：2018-03-27
申请号：US14903879
申请日：2014-11-04
IPC分类号： A61L15/24 , A61L15/20 , A61F13/53 , A61F13/49 , C08F299/00 , C08F8/00 , C08F2/32 , C08F20/06
CPC分类号： A61L15/24 , A61F13/49 , A61F13/53 , A61L15/20 , C08F2/32 , C08F8/00 , C08F20/06 , C08F299/00
摘要： Provided are a water-absorbent resin having better water-absorption performance and being prevented from discoloring before and after storage for a long time under high temperature and high humidity, and an absorbent article including the absorbent resin. The water-absorbent resin according to the present invention is prepared by polymerizing a water-soluble ethylenically unsaturated monomer in the presence of an internal-crosslinking agent and performing post-crosslinking with a post-crosslinking agent, wherein the water-absorbent resin satisfies the following properties: (A) a water-absorption capacity of physiological saline of 55 g/g or more, a water-absorption capacity of physiological saline under a load of 4.14 kPa of 15 mL/g or more, and a residual monomer content of 300 ppm or less; and (B) a yellow index of 5.0 or less and a yellow index change ratio (ΔYI) after leaving for 10 days under 70° C. and 90% RH of 10 or less.
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公开(公告)号：US20170210831A1
公开(公告)日：2017-07-27
申请号：US15324753
申请日：2014-11-04
CPC分类号： C08F8/14 , A61F13/15 , A61F13/49 , A61F13/53 , A61L15/24 , A61L15/60 , B01J20/267 , C08F2/32
摘要： Provided is a water-absorbent resin that increases the diffusivity of a to-be-absorbed liquid and that makes it possible to effectively decrease the amount of re-wet. The water-absorbent resin is obtained by polymerizing a water-soluble ethylenicallyally unsaturated monomer under the presence of an internal-crosslinking agent, has the water-absorption capacity of physiological saline under a load of 4.14 kPa at 120 minutes passed from the start of water absorption of 20 ml/g or more, and exhibits the degree of swelling under a load at 30 minutes of 70% or less when the water-absorption capacity of physiological saline under a load of 4.14 kPa at 120 minutes from the start of water absorption is designated as the degree of swelling under a load of 100%.
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公开(公告)号：US20170107312A1
公开(公告)日：2017-04-20
申请号：US14784259
申请日：2014-11-04
IPC分类号： C08F120/06 , C08J3/24 , A61L15/60 , A61F13/53 , A61L15/24
CPC分类号： C08F120/06 , A61F5/44 , A61F13/53 , A61L15/24 , A61L15/60 , C08F2/32 , C08F220/06 , C08F2810/20 , C08J3/24 , C08J2333/02 , C08L33/08
摘要： The following are provided: a water-absorbent resin in which, in the formation of an absorbent material forming an absorbent article, dispersion is satisfactory even in a moisture absorption state, which prevents the occurrence of troubles at the time of manufacturing of the absorbent article and which allows efficient manufacturing; and an absorbent article using an absorbent material containing the water-absorbent resin. The water-absorbent resin according to the present invention is obtained by polymerizing a water-soluble ethylenically unsaturated monomer and performing post-crosslinking thereon with a post-crosslinking agent, and the water-absorbent resin satisfies the requirements below: (A) yellow index is 5.0 or less; and (B) gel strength is 1800 Pa or less.
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公开(公告)号：US11504695B2
公开(公告)日：2022-11-22
申请号：US16498319
申请日：2018-03-22
摘要： Provided is a water-absorbent resin which is capable of giving an absorbent material improved gel-shape stability and which has excellent water-absorption capacity. A water-absorbent resin of the present invention is a polymer of a water-soluble ethylenically unsaturated monomer, and has the following properties (1) and (2): (1) A disintegration amount at 20-fold swelling is 30% by mass or less; and (2) a solubility in physiological saline is 25% by mass or less. (Determination Method for Disintegration Amount at 20-Fold Swelling) 5 g of the water-absorbent resin is added to 100 g of physiological saline to allow the water-absorbent resin to absorb the physiological saline, thereby obtaining a gel. The obtained gel is divided approximately equally into five portions, and these portions are introduced respectively into cylindrical molds having a length of 3.6 cm and a radius of 2.8 cm and molded. The masses of the five molded cylindrical gels are measured. The heaviest and the lightest of the five gels are removed, and the remaining three gels are used as samples. A mass Wa (g) of each sample is measured. Each weighed sample is placed on the uppermost sieve of a combination of JIS standard sieves having a mesh size of 5.6 mm and a receptacle in this order and shaken for 10 minutes using a Ro-Tap shaker (rotation speed, 290 rpm; number of taps, 165 rpm). A mass Wb (g) of the gel which has passed through the sieves is measured. The disintegration amount of each sample is calculated using the following equation: Disintegration amount of sample (%)=Wb (g)/Wa (g)×100. An average of the disintegration amounts for three samples to be measured is regarded as the disintegration amount at 20-fold swelling of the water-absorbent resin.
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公开(公告)号：US11136420B2
公开(公告)日：2021-10-05
申请号：US16804095
申请日：2020-02-28
摘要： Provided is a method of producing a water-absorbent resin comprising a step of polymerizing a water-soluble ethylenically unsaturated monomer in the presence of an internal-crosslinking agent, and a step of performing post-crosslinking, wherein: the step of polymerizing comprises one or more polymerization steps; all the polymerization steps are performed in the presence of both one or more azo based compounds and peroxides so that the both are coexistent in the all steps; in each polymerization step, a proportion of the azo compounds is 40-95 mass % relative to an amount of the azo compounds and the peroxides; the water-absorbent resin has a water-absorption capacity of physiological saline under a load of 4.14 kPa at 120 minutes passed from the start of water absorption of 20 ml/g or more; and the degree of swelling under a load at 30 minutes is 70%.
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公开(公告)号：US10525443B2
公开(公告)日：2020-01-07
申请号：US15324778
申请日：2014-11-04
IPC分类号： B01J20/26 , C08F220/06 , C08F20/06 , A61L15/24 , C08J3/24
摘要： Provided is: a water-absorbent resin which has a better water absorption performance and with which it is possible to improve absorption performance under a load when used in an absorbent material. This water-absorbent resin, obtained by polymerising a water soluble ethylenically unsaturated monomer in the presence of an internal-crosslinking agent and by post-crosslinking using a post-crosslinking agent, has a water-absorption capacity of physiological saline under a load of 4.14 kPa of 16 mL/g or more, has a mass proportion of particles from 150 to 850 μm relative to the whole proportion of 85 mass % or more, moreover has a mass proportion of particles from 300 to 400 μm relative to the whole proportion of 20 mass % or more, and has an absorption capacity elasticity index represented by formula (I) of 68,000 or more. Absorption capacity elasticity index=storage elastic modulus [Pa]×centrifugal retention rate [g/g] . . . (I).
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公开(公告)号：US20170218096A1
公开(公告)日：2017-08-03
申请号：US15324764
申请日：2014-11-04
CPC分类号： C08F8/14 , A61F13/49 , A61F13/53 , A61L15/24 , A61L15/60 , B01J20/267 , C08F2/32 , C08F8/00 , C08F220/06 , C08J3/24 , C08F220/02 , C08F2222/1013
摘要： Provided are: a water-absorbent resin which, when used as an absorbent material, retains a high water-absorption performance, increases the diffusivity of a to-be-absorbed liquid and makes it possible to effectively decrease the amount of re-wet; and an absorbent article formed using an absorbent material including the water-absorbent resin. The water-absorbent resin according to the present invention is a water-absorbent resin obtained by polymerizing a water-soluble ethylenically monomer in the presence of an internal-crosslinking agent and thereafter post-crosslinking the polymer with a post-crosslinking agent, characterized in that when subjected to a liquid flow test, the water-absorbent resin has an effective absorbent material index (K) indicated by equation (I) of 250 or greater. Effective absorbent material index (K)=[(the amount of liquid flow) (g)]×[(artificial-urine absorption ratio) (g/g)] (I)
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公开(公告)号：US20160030919A1
公开(公告)日：2016-02-04
申请号：US14759762
申请日：2014-11-04
CPC分类号： B01J20/261 , A61L15/60 , B01J20/3085 , C08F2/32 , C08F220/06
摘要： The present invention provides a process for producing a water-absorbent resin, characterized in that a reverse-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer is carried out in a hydrocarbon dispersion medium comprising a dispersion stabilizer while an azo-based compound and a peroxide are combined in the presence of an internal-crosslinking agent, in that the following formulae are satisfied, 0.10≦B/(A+B) (1), and 0.055≦B+9×C≦0.120 (2), wherein A mol, B mol and C mol represent used amounts of the azo-based compound, the peroxide and the internal-crosslinking agent, respectively, relative to 100 mol of the water-soluble ethylenically unsaturated monomer used in the polymerization, and in that a post-crosslinking reaction is carried out by adding a post-crosslinking agent after the polymerization. The present invention also relates to a water-absorbent resin having specific performance and produced by the process.
摘要翻译： 本发明提供一种吸水性树脂的制造方法，其特征在于，在包含分散稳定剂的烃分散介质中进行水溶性烯属不饱和单体的反相悬浮聚合，而偶氮类化合物和 在内部交联剂的存在下将过氧化物组合，其中满足下列公式：0.10＆nlE; B /（A + B）（1）和0.055＆amp; NlE; B + 9×C＆nlE; 0.120（2） 其中A mol，B mol和C mol分别表示相对于聚合中使用的水溶性烯属不饱和单体100摩尔的偶氮类化合物，过氧化物和内部交联剂的使用量， 通过在聚合后添加后交联剂进行后交联反应。 本发明还涉及具有特定性能并通过该方法生产的吸水性树脂。
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公开(公告)号：US10065173B2
公开(公告)日：2018-09-04
申请号：US14759762
申请日：2014-11-04
IPC分类号： C08F2/32 , C08F220/06 , B01J20/26 , B01J20/30 , A61L15/60
摘要： The present invention provides a process for producing a water-absorbent resin, characterized in that a reverse-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer is carried out in a hydrocarbon dispersion medium comprising a dispersion stabilizer while an azo-based compound and a peroxide are combined in the presence of an internal-crosslinking agent, in that the following formulae are satisfied, 0.10≤B/(A+B) (1), and 0.055≤B+9×C≤0.120 (2), wherein A mol, B mol and C mol represent used amounts of the azo-based compound, the peroxide and the internal-crosslinking agent, respectively, relative to 100 mol of the water-soluble ethylenically unsaturated monomer used in the polymerization, and in that a post-crosslinking reaction is carried out by adding a post-crosslinking agent after the polymerization. The present invention also relates to a water-absorbent resin having specific performance and produced by the process.
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