Absorbent article
a high absorbency material and absorbent material technology, applied in the field of absorbent articles, can solve the problems of gel blocking, subsequent insults cannot pass through the now swollen high absorbency material, and the use of such high absorbency materials is not without problems
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examples 1-5
[0101] Aqueous solutions of acrylic acid were prepared by combining 306 grams of acrylic acid, 334 grams of deionized water, 255 grams of 50% w / w sodium hydroxide, 9.1 grams of SR-9035 available from Sartomer (ethoxylated trimethylolpropane triacrylate), and 1.5 grams of 2,2'-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride. The aqueous solutions of acrylic acid were purged with nitrogen. Superabsorbent polymer particles were sieved through a 100 mesh screen and the particles passing through (having particle sizes below 150 microns) were collected. Sprayable blends were prepared by adding the collected superabsorbent polymer particles, in the amounts shown in Table 1 below, to the aqueous acrylic acid solution prepared above and stirring.
example 6
[0102] The sprayable blend of Example 6 was prepared in a similar manner as Examples 1-5 above, except that 158 grams of a 29% by weight aqueous solution of polyvinylpyrrolidone ("PVP") having a molecular weight of about 40,000 (PVP K 30, available from Acros Organics) was used instead of collected superabsorbent polymer particles.
[0103] The viscosity measurements reported in Table 1 below were obtained using a Brookfield Digital Viscometer Model DV-II, according to the manufacturer's directions, on 400 milliliter samples of the sprayable blends in a 600 milliliter Griffin beaker using an 02 spindle at 20 revolutions per minute. The "time" shown in Table 1, below, is the amount of time, in minutes, between adding the collected superabsorbent polymer particles and measuring the viscosity. The "weight of SAP" reported in Table 1, below, is the weight, in grams, of collected superabsorbent polymer particles, unless otherwise noted, in the sprayable blend.
1 TABLE 1 Weight Viscosity (cps...
examples 7-13
[0104] A sprayable mixture as prepared in Example 4 or Example 1 above, as indicated in Table 2 below, was sprayed using a commercial airless paint spraying apparatus onto both sides of a 0.056 square meter piece of a polyester non-woven fabric (HDK-210 available from HDK Industries, Inc. Rogersville, Tenn.) having a basis weight of 55 grams per square meter. The total amount of sprayable mixture retained by the fabric is reported in Table 2 below as "wet load".
[0105] The fabric was then cured either by ultraviolet radiation ("UV") or e-beam as indicated in Table 2 below. The fabrics cured by UV were passed under a 600 watt / in mercury vapor lamp, using a conveyor operating at 24 feet per minute. Each fabric was passed under the lamp twice, turned over and passed under the lamp another two times for a total exposure of 3.75 Joules UVA radiation per square centimeter on each side. Following the UV cure, the fabrics were dried in an oven for 10 minutes at 150.degree. C. The fabrics cur...
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