Disclosed herein is a foamed composition comprising 55 to 98 wt. % of polyamide, and 2 to 45 wt. % of innomer comprising a zinc neutralized ethylene acid copolymer. The zinc neutralized ethylene acid copolymer is the polymerized reaction product of ethylene monomer, monocarboxylic acid monomer, and unsaturated dicarboxylic acid monomer, and 30 to 70 mole percent of total acid units of the ionomer are neutralized.

Provided are a gelled composition containing a thickening agent homogeneously dissolved in a polyhydric alcohol and a method for producing it. The gelled composition contains a polymer containing an ethylenically unsaturated carboxylic acid unit and an anhydrous polyhydric alcohol. The polymer is a partially neutralized product that has a degree of neutralization of 20 to 75%, and the polymer is dissolved in the alcohol. The method for producing the composition includes a first step of preparing a dispersion of a polymer containing an ethylenically unsaturated carboxylic acid unit in an anhydrous polyhydric alcohol, and a second step of mixing the dispersion with an anhydrous polyhydric alcohol to prepare a solution of the polymer in the alcohol. The polymer for use in the first step is a partially neutralized product that has a degree of neutralization of 20 to 75%, and is in the form of spherical particles.

Poly(acrylic acid)-based superabsorbent polymer (SAP) in a feed stream is converted into poly(acrylic acid) (PAA) in an extensional flow device. The total energy used to degrade the SAP into PAA is less than about 50 MJ/kg SAP.

The present invention relates to superabsorbent polymer having an improved absorption speed through micropores formed inside, and a method for preparing the same.

Provided are a superabsorbent polymer capable of exhibiting improved bacterial growth-inhibitory property without deterioration in physical properties of the superabsorbent polymer, such as water retention capacity and absorbency under pressure, or without an increase in the generation of dust, and a preparation method thereof. The superabsorbent polymer may include a base polymer powder including a crosslinked polymer of water-soluble ethylenically unsaturated monomers including acidic groups, of which at least a part is neutralized; and a surface-crosslinked layer which is obtained by additionally crosslinking the crosslinked polymer via a surface crosslinking agent to be formed on the surface of the base polymer powder, wherein the crosslinked polymer of the base polymer powder or the surface-crosslinked layer includes an antimicrobial agent including an organic acid salt having an aromatic ring inside the crosslinked structure thereof.

The aim of the invention is to provide polyester/primer/metallic coating composite films having good adherence of the metallic coating in dry and humid conditions. Said films also form a good gas barrier: oxygen permeability less than or equal to 0.8 cc/m2/d; water vapour permeability less than or equal to 0.3 g/m2/d. To this end, the invention concerns a composite film comprising a polyester substrate, at least one coating adhering on at least one of the faces of the substrate and at least one layer of primer for cross-linked adhesion between the substrate and the coating. Said primer comprises at least one acrylic and/or methacrylic polymer P1, at least one acrylic and/or methacrylic polymer P2 different from P1, at least one cross-linking agent, and, preferably, at least one polyester that is soluble or dispersible in water: —P1 having a gel content TG1>70% by dry weight with respect to P1; —P2 having a gel content TG2≤TG1 and ≤20% by dry weight, with respect to P2; —P1 having a surface-grafted free weak acid content≥0.8 in meq/g of polymer; —[P2]≤60% by weight on dry by weight in respect to P1+P2. The method for producing said film, the adhering primer, and the articles obtained using said film, also form part of the present invention.

The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, drying the resulting polymer gel and grinding the dried polymer gel with a roll mill, wherein the rolls of the roll mill are cleaned by reducing the feed rate to the roll mill, and if the deflection and/or the power consumption increases above a setpoint, operating the roll mill with reduced feed, and increasing the feed rate to the roll mill.

A method of manufacturing a thermally insulating product comprises: (a) forming a mixture comprising solvent and gel network former and optionally foaming agent; (b) dispersing a thermally insulating filler in the mixture; and (c) drying the mixture to form the thermally insulating product.

The present invention provides a water-absorbent resin that has excellent water-absorption performance with respect to salt water; a water-blocking agent including the water-absorbent resin; and a method for producing the water-absorbent resin.

The water-absorbent resin of the present invention includes a partially neutralized polyacrylic acid having a crosslinked structure and has a swelling height of 3.5 mm/0.5 g or more with respect to 3.3 mass % salt water, as determined under the following measurement conditions.

Measurement Conditions for Salt Water Swelling Height

0.5 g of water-absorbent resin particles are sprayed over a circular concave cup having a height of 30 mm and an inner diameter of 80.5 mm. A nonwoven fabric 4 is spread thereon. A circular convex cylinder having an outer diameter of 80 mm is placed on the nonwoven fabric, and 55 g of 3.3 mass % salt water at 20° C. is poured into the circular concave cup. One minute after the start of water absorption by the water-absorbent resin particles, the degree that the circular convex cylinder is pushed up due to swelling of the water-absorbent resin particles is measured as a salt water swelling height of the water-absorbent resin.

Provided is a method of preparing a superabsorbent polymer, in which an interpenetrating polymer network (IPN) is formed on the surface of the superabsorbent polymer during formation of a surface-crosslinked layer of the superabsorbent polymer, thereby improving physical properties of the superabsorbent polymer.