A foam abrasive for grinding a workpiece includes a main part made of foam, in particular polyurethane foam, and abrasive grains which are fixed to at least one surface of the foam abrasive via a base binder made of thermoplastic polyurethane. The abrasive grains are covered with a cover binder.

Disclosed herein is a composite material suitable for inhibiting biofilm growth, the composite material comprising a substrate material and a random copolymeric material covalently bonded to a surface of the substrate material. The random copolymer contains repeating units having at least one functional group bearing a cationic charge and repeating units having at least one functional group bearing an anionic charge, where the repeating units are derived from compatible monomers that belong to different monomer classes having differing polymerisation kinetics. Specifically, the random copolymeric material is poly(AMPTMA-ran-SPM), wherein AMPTMA is (3-acrylamidopropyl) trimethylammonium chloride and SPM is 3-sulfopropyl methacrylate potassium. Also disclosed are methods of manufacturing said material and applications thereof.

The invention relates to a process for producing a composite polyisocyanurate material, comprising the following steps: a) providing a polyisocyanate composition A) which comprises oligomeric polyisocyanates and is low in monomeric diisocyanates, “low in monomeric diisocyanates” meaning that the polyisocyanate composition A) has a content of monomeric diisocyanates of not more than 20% by weight, and b) catalytically trimerizing the polyisocyanate composition A) in the presence of at least one fibrous filler B) and of a trimerization catalyst C) to give the composite polyisocyanurate material, where the trimerization catalyst C) comprises at least one metal salt and/or quaternary ammonium salt. The invention further relates to composite polyisocyanurate materials obtainable by the process according to the invention and to the use thereof for production of a component, and to components consisting of or comprising a composite polyisocyanurate material according to the invention.

The present invention relates to a method for preparing a foamed thermoplastic polyurethane elastomer product, comprising the steps of: 1) coating a binder: coating the binder on the surfaces of expandable thermoplastic polyurethane elastomer particles; 2) curing and molding: adding the product obtained from step 1) to a mold and then placing it in a vulcanizing machine for curing and molding; and 3) cooling and setting: cooling the mold after the molding in step 2) to obtain the product of the present invention. By means of pre-coating the binder on the surfaces of expanded thermoplastic polyurethane elastomer particles according to the present invention, the weight of the binder can be reduced, and the properties of the expanded thermoplastic polyurethane elastomer particles can be utilized to the maximum extent.

A method of forming a polymeric foam material is provided and includes providing a precursor material having a first thickness, the precursor material being an open-cell foam material and applying a uniaxial compressive force to the precursor material to compress the precursor material to a second thickness, the compressive force causing a cell structure of the precursor material to collapse. The method also includes heating the precursor material at a molding temperature for a first time period while the compressive force is applied, the first time period being sufficient to heat the precursor material to a softening temperature, removing the compressive force from the precursor material, and maintaining the cell structure of the precursor material in a collapsed state.

A stretchable wiring film includes: (A) a stretchable film made of, at least as a top surface of the stretchable film, a cured product of a stretchable film material containing a silicone polyurethane resin; and (B) a stretchable wiring. The top surface of the stretchable film has a repeated uneven pattern formed with depths of 0.1 μm to 5 mm and pitches of 0.1 μm to 10 mm. The stretchable wiring is formed on the top surface of the stretchable film where the repeated uneven pattern is formed. Thus, the present invention provides: a stretchable wiring film having less decrease in electric conductivity in stretching and excellent water repellency on the film top surface; and a method for forming the stretchable wiring film.

The invention relates to a multi-stage process for the continuous preparation of thermoplastic polyurethanes by reacting one or more aliphatic, cycloaliphatic and/or araliphatic diols with one or more aliphatic, cycloaliphatic and/or araliphatic diisocyanates, wherein the total reaction enthalpy is ≤−500 kJ/kg over all the process stages at a molar ratio of diol to diisocyanate of 1.0:1.0.

The reactor system comprises a reactor vessel with at least one inlet and a first and a second outlet, which reactor vessel is configured for depolymerisation of a condensation polymer and which first and second outlet are configured for removal of a first and a second part of a reaction mixture. The reactor system further comprises a heat exchanger downstream of the first outlet. Herein the second outlet is arranged at a lower position of the reactor vessel than the first outlet. The first outlet is configured for removal of the first part being a dispersion and/or solution comprising said condensation polymer and depolymerisation products thereof in a solvent. Said first part is led to the heat exchanger. The second outlet is configured for removal of the second part including agglomerates. The reactor system is used for depolymerisation of a condensation polymer.

A foam containing a nitrile group-containing conjugated diene copolymer and a urethane polymer, wherein relative to 100 wt % of the sum of the nitrile group-containing conjugated diene copolymer and the urethane polymer, the nitrile group-containing conjugated diene copolymer is present in an amount of less than 90 wt % and the urethane polymer is present in an amount of more than 10 wt %, the nitrile group-containing conjugated diene copolymer contains ethylenically unsaturated nitrile monomer units in an amount of more than 31 wt %, the foam has a density of 0.08 to 0.30 g/cm.sup.3, and in observation of an arbitrary cross section of the foam, air bubble cross sections present in the cross section have an average diameter of 350 μm or less, and the number of air bubble cross sections with a diameter of 0.6 mm or more present in the cross section is 0.062 per mm.sup.2 or less.

Aspects of the present disclosure provide for composite structures including a bonding layer that adheres a substrate (e.g., including a polymeric composition such as rubber) to a material (e.g., including a polymer such as polyurethane). The adhesion of the substrate to the material through the bonding layer can include chemical bonds such as, but not limited to, siloxane linkages, silanol linkages, silyl linkages, or any combination thereof in the bonding layer.