Photocurable (meth)acrylate compositions for forming features on the surfaces of membranes, and particularly, on membranes used in osmosis and reverse-osmosis applications, such as membrane filters.

Photocurable (meth)acrylate compositions for forming features on the surfaces of membranes, and particularly, on membranes used in osmosis and reverse-osmosis applications, such as membrane filters.

The invention relates to a film Film comprising a random graft copolymer having a polypropylene (PP) backbone and from 3 to 8 polyester segments covalently bonded to said backbone, wherein the number average molecular weight (Mn) of the polypropylene backbone ranges between 10.000 and 100.000 Dalton (as determined with HT-SEC in o-DCB at 150° C.), wherein the Mn of each polyester segment ranges between 5.000 and 25.000 Daltons, wherein the amount of PP ranges between 45 and 80 mol %, wherein the amount of polyester segments ranges between 55 and 20 mol %, wherein the film has a thickness in the range of 0.01-10 mm, wherein the polypropylene and polyester domains form independently continuous phases, and wherein the mol % is calculated relative to the total moles of monomer units present in the copolymer. The invention further relates to a nano porous PP membrane and its use.

Disclosed are polyurethane-based foams. The foams may have one or more vicrucidal/bactericidal agents. The foams may be used as filters that capture and/or inactivate viral particles, such as, virions associated with COVID-19. Also described are methods of making the foams and methods of using the foams.

Provided is a polyurethane resin-forming composition for a membrane-sealing material, the polyurethane resin-forming composition contributing to formation of (1) a urethane resin that is excellent in moldability, has a suppressed elution amount of a low-molecular-weight reaction product, and has excellent appearance or (2) a urethane resin that has a low viscosity, is excellent in cast moldability, and has a reduced water elution amount of a low-molecular-weight reaction product and a reduced solvent elution amount of a molded product.

The polyurethane resin-forming composition for a membrane-sealing material comprises: a polyisocyanate prepolymer (A) or an allophanate group-containing polyisocyanate prepolymer (A′) comprising a reaction product of a diphenylmethane diisocyanate (a1-1) and/or a modified product of a diphenylmethane diisocyanate (a1-2), and an active hydrogen-containing compound (a2); and a castor oil polymerized polyol (b1) comprising a castor oil polymerization product.

This disclosure describes compositions including a perfluoropolyether (PFPE) bottlebrush polymer, optionally blended with other fluoropolymers. The compositions may be disposed on an article, including, for example, a porous filtration media, to form a fluoropolymer-containing article. This disclosure further describes methods of making fluoropolymer-containing articles and methods of using the fluoropolymer-containing articles.

Thermoplastic polyurethane (TPU) compositions, methods for producing TPU compositions, methods of using TPU compositions, and apparatuses produced therefrom are disclosed. Disclosed TPU compositions include a thermoplastic polyurethane polymer, a heat stabilizer, a flow agent, and a filler material. The filler may be a glass fiber. Disclosed TPU compositions have improved thermal stability and improved flow properties suitable for injection molding of articles of manufacture having a large plurality of fine openings or pores. Articles produced from the composition have superior thermal stability, abrasion resistance, and chemical resistance. Example articles include screening members for vibratory screening machines.

Embodiments of the present disclosure includes an elastomeric polyurethane foam with improved high temperature performance, comprising a reaction product of components including: (a) an isocyanate functional urethane prepolymer derived from one or more prepolymers comprising monomeric diphenylmethane diisocyanate (MDI) and polymeric MDI, and a polyether diol; and (b) an isocyanate-reactive component including: (i) a first polyol in an amount of about 10 to about 70 parts by weight of the isocyanate-reactive component, wherein the first polyol is a propylene oxide or ethylene oxide-capped nominal diol with a number-average molecular weight between about 1000 g/mol and about 9000 g/mol; (ii) a second polyol in an amount of about 0 to about 50 parts by weight of the isocyanate-reactive component, wherein the second polyol is a nominal triol with a high proportion of randomly dispersed ethoxy groups with a number-average molecular weight between about 1000 g/mol and about 8000 g/mol; (iii) a third polyol in an amount of about 0 to about 20 parts by weight of the isocyanate-reactive component, wherein the third polyol is an ethylene oxide-capped nominal tetraol with a number-average molecular weight between about 250 g/mol and about 6000 g/mol; and (iv) a fourth polyol in an amount of about 0 to about 80 parts by weight of the isocyanate-reactive component, wherein the fourth polyol is an ethylene oxide or propylene oxide-capped nominal triol with a number-average molecular weight between about 1000 g/mol and about 13000 g/mol. In one another embodiment, the isocyanate-reactive component also includes an additive package in the amount of about 1 to about 30 that can contain, but is not limited to, blowing agents, catalysts, coloring agents, inorganic filler, and anti-oxidants.

The invention relates to a method for potting hollow fiber membranes in potting compounds of increased temperature resistance, wherein an isocyanate component with inorganic particles and a polyol component are processed into a potting compound and the hollow fiber membranes are tightly encased by the potting compound in at least one potting zone by the hardening of said potting compound.

Disclosed are polyurethane encapsulating compounds for embedding hollow fibers of filter elements, obtainable by mixing a polyol component (A) and an isocyanate component (B), including at least one aromatic isocyanate, to give a reaction mixture and reacting the mixture to completion to give the polyurethane encapsulating compound. The polyol component (A) includes at least one fatty-acid-based polyol (a1) having a hydroxyl number of greater than 50 to less than 500 mg KOH/g and a functionality of from 2-6, and at least one bismuth catalyst (a2), obtainable by mixing a bismuth carboxylate (a2-1) with an amine compound (a2-11) having at least one tertiary nitrogen atom and at least one isocyanate-reactive hydrogen atom. The molar ratio of bismuth to amine compound (a2-11) is 1:0.5-1:50. Also disclosed are methods for producing filter elements using the polyurethane encapsulating compounds and to uses of the polyurethane encapsulating compounds for the embedding of hollow fibers.