Akzo Nobel N.v.

Teijin Aramid B.v.

Teijin Aramid Gmbh

Robin Winters

Elwin Schomaker

Siebe Cornelis De Vos

Regine Zumloh-Nebe

Marianne Frederika Reedijk

Johanna Henriëtte Zijtveld-Van Der Wiel

Christian Norhausen

Ronald Folkert Waarbeek Ter

Manufacturing a spun-dyed para-aramid filament yarn includes (a) preparing a spin dope comprising a para-aramid polymer, at least one dyestuff and concentrated sulfuric acid, (b) spinning the spin dope through a spinneret to obtain spun filaments, (c) coagulating the spun filaments to obtain coagulated filaments, (d) neutralizing the coagulated filaments to obtain neutralized filaments, (e) washing the neutralized filaments to obtain washed filaments, and (f) drying the washed filaments to obtain dried filaments. In step a) the spin dope includes 17.5 to 18.5% by weight of a para-aramid polymer with respect to the weight of the spin dope, and 4 to 15% by weight of the at least one dyestuff with respect to the weight of the para-aramid polymer plus the at least one dyestuff. In step f) the filaments are hold under a tension in a range from 0.2 to 0.8 cN/dtex.

Process to manufacture a spun-dyed para-aramid filament yarn and sliver

Spun-dyed aramid fibers, wherein spun-dyeing was performed with a completely organic pigment exhibiting the chemical structure of formula (I): wherein, independently from one another, Rrepresents a substituent of formula Xor a substituent of formula X: wherein Xis linked via the group NH having two bonds in the structure represented by X, while Xis linked via the carbon atom, which is in a para relationship with the NH-group of X; and Rrepresents H or NH. The spun-dyed aramid fibers exhibit constant coloristic properties and wash proof properties.

Spun-dyed aramid fibers

A process is disclosed for preparing an organically modified layered double hydroxide having a distance between the individual layers of the layered double hydroxide of about 1.5 nm and comprising an organic anion as charge-balancing anion, the process comprising the steps of: (a) preparing a precursor suspension comprising a divalent metal ion source and a trivalent metal ion source; (b) solvothermally treating the precursor suspension to obtain a double layered hydroxide, wherein an organic anion is added before or during the formation of the layered double hydroxide of step (b), or following the formation of the layered double hydroxide, so as to obtain the organically modified layered double hydroxide, with the proviso that deoxycholic acid is not the sole organic anion.

Process for preparing organically modified layered double hydroxide

The invention relates to a process for preparing a layered double hydroxide comprising a charge-balancing anion, the process comprising the steps of: (a) preparing a precursor suspension or solution comprising a divalent metal ion source, a trivalent metal ion source, water, and a solvent which is miscible with water and in which at least 5 g/l of a charge-balancing anion precursor can be dissolved; (b) treating the precursor suspension or solution to obtain the layered double hydroxide, wherein the charge-balancing anion precursor is added to the suspension or solution before, during or after step (b), and wherein, if the charge-balancing anion is an organic anion, less than 50 wt % of the charge-balancing anion precursors, based on the total weight of charge-balancing anion precursors, is a salt, with the proviso that the charge-balancing anion is not carbonate. The invention further pertains to a layered double hydroxide obtainable by this process.

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Bemmel, Netherlands

Robin Winters