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Wilke P.,RWTH Aachen | Coger V.,Hannover Medical School | Nachev M.,University of Duisburg - Essen | Schachschal S.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG | And 6 more authors.
Polymer (United Kingdom) | Year: 2015

We present a novel and facile method for the design of biocompatible microgel-modified microfibers loaded with ZnO nanoparticles capable of zinc ion release under physiological conditions. The microfibers consist of three materials hierarchically assembled in a controlled and reproducible way. We synthesized poly(N-vinylcaprolactam-co-itaconic acid) aqueous microgels with carboxylic groups located in the microgel core. The obtained microgels can be loaded with various amounts of ZnO nanoparticles by in-situ growth of ZnO in microgels. As shown by electrophoretic mobility and TEM measurements, ZnO nanoparticles are selectively loaded in the microgel core and stabilized by itaconic acid groups bearing strong negative charges. ZnO-loaded microgels were used as functional additive to produce poly(ε-caprolactone) (PCL) microfibers using the electrospinning process. The resulting microfibers consist of a PCL core coated with the microgels located at the surface of the fibers. The variation of the ZnO amount loaded into microgels allows regulating the ZnO content in microfibers and gives the possibility to tune the released amount of zinc ions in aqueous medium at pH 7.5 and 37 °C. We demonstrate that the obtained functional microfibers are biocompatible and non-toxic, thus being good candidates for biomedical applications like scaffolds for tissue engineering, biointerface coatings or wound closing dressings. © 2015 Elsevier Ltd. All rights reserved.


Mehlhorn A.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Mobius S.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG
Melliand International | Year: 2011

It is possible to solve or at least minimize the entire range of problems concerning yellowing of elastic textiles by applying appropriate anti-yellowing agents. The Protelan range by Zschimmer & Schwarz Mohsdorf GmbH, Burgstädt/Germany, includes innovative products launched to provide a solid quality for the goods as well as cost-savings. A specific selection of auxiliaries can have a high impact on solving distinctive substrate and finishing problems as well as on meeting the customers' requirements for brilliant white and color shades. Processing times can be shortened and relatively instable recipes will become more reliable.


Gebhardt C.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Hemeltjen C.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Richter F.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Schonfeld A.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Umber R.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG
Melliand International | Year: 2011

Dyers can rise to the initially stated challenge wherein it is possible to develop the appropriate optimization strategy by being familiar with the various influencing parameters and controlling them in a favorable way with regard to elasticity, levelness and fastness level of goods. Special attention must be paid to the temperatures of the thermosetting procedure. As a basic principle, a declining temperature profile is recommended, using high temperatures during thermosetting when performed before dyeing and lower temperatures during thermosetting/drying when performed after dyeing which is better than the inverse. The application of the chemical auxiliaries specified, adapted to the respective process technology and to the desired article properties, allows the performance of successful dyeings of articles from polyester microfiber/elastane compositions required to meet high quality standards.


Mehlhorn A.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG | Mobius S.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG | Schonfeld A.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG
Unitex | Year: 2010

The careful and specific selection of products and processes is the way to achieve good results in the continuous treatment of polyamide/elastane tapes. The special detergent TISSOCYL RC 9 excellently emulsifies fibre lubricants and silicone oils enabling a stainless finishing of microfibres and highly elastic tapes in particular. ZETESAL NR and ZETESAL NR gold are efficient products for anionic after-treatment increasing the wet fastness level. A further improvement can be obtained by a cationic after-treatment with ZETESAL CPW. The anti-yellowing agents PROTELAN LGS and PROTELAN ATY-P provide an optimum protection against thermal and storage yellowing and, thus, a higher process reliability and reproducibility.


Mehlhorn A.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG | Mobius S.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG | Schonfeld A.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG
Melliand Textilberichte | Year: 2010

Modern underwear and brassieres are made of mostly of polyamide/elastane materials. The increasing importance of microfiber articles with a high proportion of elastane is contingent on the extraordinarily high functionality and the versatile usage properties of these goods. Such fabrics combine high wearing comfort with fashionable design, but put the textile finisher before big challenges. Above all, for ladies' underwear, the textile finishing must make sure that the basic knitted fabrics such as lace match with the corresponding small ribbons with regard to color tone, fastness and protection from yellowing. Here, solutions for a successful continuous narrow fabric finishing will be shown.


Geu A.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG.
Unitex | Year: 2010

During the next few months, C8 fluorocarbon resins that have been applied up to now will disappear from the markets for ecological reasons. It would have been possible to continue the C8 technology up to the year 2015, however, most manufacturers have announced the phase out by end of this year or next year. The textile users face the challenge to find out and select the suitable C6 products in order to provide the current level of water- and oil repellency performance as well as the same quality of other effects. The concentrated fluorocarbon resin Anthydrin SC is an universal product for starting with the C6 chemistry because it produces excellent effects on different fibre materials so that the quality level of the products the final textile users have become accustomed to is maintained.


Mehlhorn A.,ZSCHIMMER and SCHWARZ Mohsdorf GmbH and Co KG | Mobius S.,ZSCHIMMER and SCHWARZ Mohsdorf GmbH and Co KG | Knoblauch A.,ZSCHIMMER and SCHWARZ Mohsdorf GmbH and Co KG | Peukert M.,ZSCHIMMER and SCHWARZ Mohsdorf GmbH and Co KG
Unitex | Year: 2016

The pre-treatment process COLD WHITE developed by Zschimmer and Schwarz is an alternative method for the discontinuous hydrogen peroxide bleaching of knitted fabrics and yarns of cotton or its blends with synthetic fibres. It represents a perfect basis for customized pretreatment formulations providing flexibility by adapting them to the respective production conditions and grey fabric qualities with simple adjustments. The low temperature bleaching COLD WHITE not only involves a responsible dealing with our environment but also considering economic aspects like high production safety, consistent quality and improved competitiveness of our customers.


Gebhardt G.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Richter F.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Schonfeld A.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Wolf K.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG
Melliand International | Year: 2010

Oligomers are formed during manufacturing of granules or spinning of the polyester fiber material when multiple thermal stresses occur. Oligomers are finely dispersed in the dyeing liquor at 125-130° C but agglomeration and deposition on the textile substrate or machine parts may take place during the cooling down phase. The state-of-the-art for eliminating oligomers is draining off the dyebath under high temperature conditions, dyeing in alkaline medium and alkaline reduction clearing. The reduction clearing process is carried out in an intensive way using up to 10 mI/I NaOH. This method for oligomer removal is time consuming and not always successful. The performance of the dispersant can also be proven during rewinding of a polyester yarn package by collecting the abrasion particles in a beaker. Finally, the fact of substantial oligomer deposition on machine parts should be mentioned, which finishers who mainly dye polyester material in the acidic dyebath complain about because this involves extensive cleaning of the dyeing machines.


Mehlhorn A.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Mobius S.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG | Schonfeld A.,Zschimmer and Schwarz Mohsdorf GmbH and Co. KG
Melliand International | Year: 2010

The careful and specific selection of products and processes is the way to achieve good resuits in the continuous treatment of PA/EL tapes. The special detergent Tissocyl RC 9 very good emulsifies fiber lubricants and silicone oils enabling a stainless finishing of microfibers and highly elastic tapes in particular. Zetesal NR and NR gold are efficient products for anionic after-treatment increasing the wet fastness level. A further improvement can be obtained by a cationic aftertreatment with Zetesal CPW. The anti-yellowing agents Protelan LGS and ATY-P provide an optimum protection against thermal and storage yellowing and, thus, a higher process reliability and reproducibility.


Geu A.,Zschimmer and Schwarz Mohsdorf GmbH and Co KG
Technische Textilien | Year: 2010

Fluorocarbon resins have become an indispensable feature in the field of textile finishing. Ecological reasons necessitate a change of their chemistry which results in generating new products. Application technicians face a challenging task.

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