09-05-2013 дата публикации
Номер: US20130112623A1
The invention describes a composite microfiber, which is comprising a polysaccharide polymer selected from the group consisting of cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, ethyl cellulose, n-propyl cellulose, isopropyl cellulose, cellulose acetate and combinations of two or more of these substances, and combinations of two or more of these substances, thereby the polysaccharide polymer further comprising substituents comprising a given formula, wherein k is 1 or greater, and wherein each moiety Ris independently selected from H and methyl, and wherein each moiety Ris independently selected from —H, —OH, —NH, —SH, —OR, —NHRand —NRR, —SR, and wherein each moiety Rand Rare chemical groups independently selected from C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkoxy halide and C1-C4 heteroalkyl substituents, and is preferably selected from —CH, —CH—CH, —CH—OH, —CH—CH—OH, —CH—CH—NH, —CH—CH(OH)—CH—OH, —CH—CH(OH)—CH, glycidyl, anhydride, sulfonic acid and hydroxysuccinimide, said substituents forming a hydrogel in the presence of water, and said composite microfiber having a swelling factor of at least 10%, preferably of 10-400%. 3. The method as recited in claim 2 , wherein:a) the monomers for gamma radiation induced polymerization are vinyl monomers, such as glycidyl methacrylate (GMA) and dimethyl acrylamide (DMAA) and/orb) the liquid medium is a polar liquid medium and such as water and optionally one or more of methanol, ethanol, n-propanol, iso-propanol, butanol, ter-butanol, acetonitrile, dimethylsulfoxide, acetone, dimethylformamide, and mixtures thereof.4. The method as recited in claim 2 , wherein the gamma radiation induced polymerization is performed in the absence of a polymerization initiator substance claim 2 , such as in the absence of peroxides and/or azo compounds.5. The method as recited in claim 2 , wherein the gamma radiation induced polymerization is performed witha) a radiation dose of 5-15 kGy, and/orb) a dose velocity of ...
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