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Elastomeric compositions that resist force loss

A technology of elastic components and copolymers, applied in bandages, absorbent pads, medical science, etc., can solve problems such as poor fit, performance loss, and increased discomfort

Inactive Publication Date: 2013-07-17
PROCTER & GAMBLE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This strain locking can lead to loss of properties as the product ages, such as slow recovery stretch laminates with reduced unloading force at 37°C, which can lead to poor fit
Depending on the location of one or more slow recovery stretch laminates within the absorbent article and depending on the specific absorbent article, a poor fit may result, for example, in increased leakage of urine or feces during use, loosening of the absorbent article during use, Sagging or drooping, or increased discomfort with wearing absorbent products

Method used

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  • Elastomeric compositions that resist force loss
  • Elastomeric compositions that resist force loss
  • Elastomeric compositions that resist force loss

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0227] Slow recovery stretch films were prepared using different amounts of elastomeric polymer, modified resin, and mineral oil as shown in Table 2. Blending was accomplished by extrusion of the blends (sample films F1a, F1b and F2) or by melt mixing in small batches and compression molding on a heated Carver press into films (sample films F3-F6). Sample films F1a and F1b comprise unhydrogenated styrene-isoprene-styrene (SIS) triblock copolymers, which are available under the trade name 4211 is commercially available from Dex Polymers L.P. (Houston, TX). Sample films F2 and F3 comprised hydrogenated styrene-ethylene-ethylene / propylene-styrene (SEEPS) triblock copolymers, which are available under the trade name Septon TM 4033 is commercially available from Kuraray America Inc. (Pasedena, TX). Sample films F4-F6 comprised a combination of SEEPS triblock copolymers available under the trade name Septon TM 4033 and Septon TM 4044 are commercially available from Kuraray Amer...

example 2

[0243] Slow recovery stretch laminates were prepared with the extruded films disclosed in Table 2 (sample films F1b and F2). Elastomeric film samples were cut about 40 millimeters wide by about 117 millimeters long for Sample Film Flb, or about 40 millimeters wide by about 147 millimeters long for Sample Film F2. Weigh the mass of each elastomer film to the nearest 0.1 mg. The basis weight (grams per square meter, "gsm") of each membrane was calculated by dividing the membrane weight (in grams) by the membrane area (length times width, in square meters). The slow recovery stretch laminates in Table 4 bonded multilayer laminate structures comprising two nonwovens sandwiching an elastomeric film. The nonwoven purchased from First Quality Nonwovens (Great Neck, NY) was a spunbond-meltblown-spunbond polypropylene thermally bonded nonwoven having a basis weight of about 22 gsm. A nonwoven was bonded to the first surface of the elastomeric film using a single layer of adhesive in ...

example 3

[0262] Example 3: Polymer Molecular Weight Determination

[0263] Polymer number average molecular weight and molecular weight distribution were determined by GPC SEC / MALS. GPC uses a Waters Alliance 2695HPLC autoinjector. It contains three Styragel HR columns (HR3, HR4 and HR5). The column heater was set to 30 °C. The flow rate was 1.0 mL / min and the mobile phase was HPLC grade tetrahydrofuran purchased from Sigma-Aldrich Inc. (St. Louis, MO). The detector was a Wyatt Dawn EOS light scattering detector calibrated with toluene, and 100 kilodalton polystyrene (molecular weight standards, purchased from Polysciences, Inc. (Warrington, PA)) and Waters 2414 refractive index were used in the mobile phase. Detectors were normalized at 30°C. Samples were prepared for analysis at a known concentration of 2 mg / mL. Samples were filtered using a 0.45 μm nylon membrane filter. The injection volume was 100 μL. Data were collected and analyzed using ASTRA 5.3.2.15. Values ​​of dn / ...

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Abstract

Embodiments of the present disclosure may provide various properties of slow recovery polymers, films, and laminates that in combination with an hydrogenated block copolymer provide for (1) an order-disorder transition temperature of greater than about 135 DEG C, (2) a hard phase glass transition temperature of greater than about 60 DEG C, (3) a combination of one or more hard block associating ingredients that maintain or increase the glass transition temperature of at least one equivalent hard block polymer of the hydrogenated block copolymer, (4) a force retention factor of greater than about 2, (5) aromatic substitution of either or both the soft block and the hard block, (6) hard blocks with a solubility parameter of greater than about 9.1 (cal / cm<3>)1 / 2, and (7); compositions that remain extendable to at least 50% engineering strain after exposure to isopropyl palmitate for 30 hours at room temperature.

Description

technical field [0001] The present invention relates to absorbent articles comprising slow recovery stretch laminates, such as diapers, training pants, adult incontinence articles, feminine hygiene articles, and the like. Background technique [0002] It may be desirable to construct absorbent devices with stretch laminates, such as disposable diapers with fasteners, pull-on diapers, training pants, sanitary napkins, pantiliners, incontinence briefs, etc., to improve comfort with movement and maintain Lasting fit. In addition, the stretch laminate allows the diaper to accommodate wearers of different sizes. The diaper may have a stretch laminate in its various article elements, including the waistband, leg cuffs, side panels, elasticized topsheet, backsheet, ear panels, outer cover, and fastening system. [0003] As disclosed in U.S. Patent 7,717,893 and U.S. Patent Publication US2005-0273071, there is a need for absorbent products comprising stretch laminates that slowly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/56A61L15/24A61F13/494A61F13/511
CPCA61L15/24C08L25/06
Inventor D·H·梅利克S·D·史密斯R·J·麦凯恩
Owner PROCTER & GAMBLE CO