摘要:
The invention pertains to a method for improving bundle cohesiveness of a bundle of aramid yarns and decreasing its friction coefficient, comprising adding to the bundle of yarns 0.1 - 3.0 wt.%, based on the yarn weight, of a water-soluble or water-dispersible film forming binding agent, followed by treating the bundle of yarns with an oil having an intrinsic viscosity less than 100 mm 2 /s.
摘要:
An electroconductive composition witch comprises 100 parts by weight of a polyether polyurethane (A) prepared by the copolymerization of 33 to 53 wt % of a C8-22 aromatic polyfunctional isocyanate (a) and 47 to 67 wt % of a polyether polyol (b) having a C 3-6 oxypolymethylene recurring unit or a 100 parts by weight of a polycarbonate polyurethane (B) prepared by the copolymerization of 13 to 33 wt % of the above isocyanate (a) and 67 to 87 wt % of a polycarbonate polyol (c) having a C 3-6 oxycarbonyl oxypolymethylene recurring unit, and 70 to 180 parts by weight of an electroconductive material (C), wherein the electroconductive material (C) preferably comprises a flake graphite carbon and a carbon black exhibiting a low dibutyl phthalate oil absorption. The electroconductive composition is excellent in the adhesion to a base material and the resistance to hydrolysis, and is applied to a fiber material as a coating to provide an electroconductive fiber material.
摘要:
A process for producing a polyurethane, comprising polyesterifying a carbamate containing at least two functional groups selected from hydroxyl groups and carboxylic acid groups or esters or anhydrides thereof, in the presence of a polyesterification enzyme, and optionally in the presence of one or more copolymerizable monomers having two or more functional groups selected from hydroxyl groups and carboxylic acid groups or esters or anhydrides thereof. This process enables a broader range of polyurethanes to be accessed commercially than the previously described processes.
摘要:
The present invention relates to an aqueous preparation comprising a polyisocyanate prepolymer that is masked with bisulfite and that, in relation to the unmasked state, consists of a) 10 to 40 wt. % of at least one polyetherpolyol, b) 20 to 85 wt. % of at least one polyesterpolyol and c) 5 to 30 wt. % of at least one polyisocyanate and d) 0 to 30 wt. % of at least one additional component which is provided with at least one group that can react with isocyanate groups and an NCO value in the range of 2.5 to 5.0. The preparation can be used for the antifelting finish of wool.
摘要:
The invention relates to latent cross-linking aqueous polyurethane dispersions containing I) a dispersed phase(P.1) containing Ia) a polyurethane carrying carbodiimide groups in addition to hydrophilic groups causing water dispersibility and carrying practically no carboxyl groups or Ib) a physical mixture of Ibi) a polyurethane (Ib1) carrying hydrophilic groups causing water dispersibility and carrying practically no carbodiimide and carboxyl groups, and Ibii) a carbodiimide (Ibii) carrying practically no hydrophilic groups causing water dispersibility; II) a dispersed phase (P.11) containing another polymer (II) carrying carboxyl groups and practically no carbodiimide groups.
摘要:
The present invention relates to a textile with virus-inhibiting effect comprising a flat weave formed by interwoven weft yarns and warp yarns, wherein the textile is treated with an antibacterial and antiviral coating. The invention also relates to a roller blind, pull-up blind, pleated blind or slatted blind, a wall covering and a carpet.