An object is to provide a polyurethane elastomer excellent in strength and surface smoothness. To attain the object, a urethane composition including a certain prepolymer, a plasticizer and a crosslinking agent is provided.

Described herein is a method for producing a PU foam insole, including the following steps of: (1) pouring the raw materials used to form a PU foam into a mould, reacting to obtain a PU sheet, where the height of the mould cavity is from about 1.0 to about 1.6 times of the total thickness of two finished insoles; (2) splitting the PU sheet into two halves in the horizontal direction to obtain two pieces of PU insole material, where one surface of the material has open pores, and the other surface of the material has a skin; and (3) attaching a piece of fabric onto the surface having open pores of the material obtained in step (2). Also described herein is a PU foam insole produced by the method.

Described herein is a method for producing a PU foam insole, including the following steps of: (1) pouring the raw materials used to form a PU foam into a mould, reacting to obtain a PU sheet, where the height of the mould cavity is from about 1.0 to about 1.6 times of the total thickness of two finished insoles; (2) splitting the PU sheet into two halves in the horizontal direction to obtain two pieces of PU insole material, where one surface of the material has open pores, and the other surface of the material has a skin; and (3) attaching a piece of fabric onto the surface having open pores of the material obtained in step (2). Also described herein is a PU foam insole produced by the method.

A process for manufacturing an object involves the steps of: I) depositing a radically cross-linked resin on a carrier so that a layer of a structuring material joined to the carrier is obtained, said layer corresponding to a first selected cross-section of the object; II) depositing a radically cross-linked resin on a previously applied layer of the structuring material so that an additional layer of the structuring material is obtained which corresponds to a further selected cross-section of the object and which is joined to the previously applied layer; III) repeating step II) until the object is formed, wherein the deposition of a radically cross-linked resin in steps I) and II) includes the application of a radically cross-linkable resin to the carrier or the previously applied layer and is performed at least in step II) by applying energy to a selected region of a radically cross-linkable resin, corresponding to the selected cross-section of the object, the radically cross-linkable resin having a viscosity (23° C., DIN EN ISO 2884-1) of ≥5 mPas to ≤100,000 mPas. The invention further relates to the use of such a resin in an additive manufacturing process. The radically cross-linkable resin comprises a curable component which is obtained by reacting a polyisocyanate or a polyisocyanate descendant containing at least one oxadiazine trione group (formula I) with a compound that contains acrylate, methacrylate or vinyl ether double bonds and 25 Zerewitinoff active H atoms.

An aqueous coating composition includes: i) an aqueous dispersion of a hydroxyl functional acrylic polymer; ii) a urethane component; iii) a hydroxyl reactive crosslinking agent different from component ii); and iv) an aqueous liquid carrier. The coating composition has a volatile organic (VOC) content of less than 420 g/L, and may be applied to a side seam strip or a side seam of a three-piece can.

A multi-layer coating system includes: (a) a first basecoat layer formed from a first coating composition including a free polyisocyanate and hydroxyl functional polymeric core-shell particles; (b) a second basecoat layer applied over at least a portion of the first basecoat layer, the second basecoat layer formed from a second coating composition including carboxylic acid functional polymeric core-shell particles; and (c) a topcoat layer applied over at least a portion of the second basecoat layer, the topcoat layer formed from a coating composition including least one free polyisocyanate having a weight average molecular weight of less than 600 g/mol and at least one film-forming resin in which an amount of free polyisocyanate having a weight average molecular weight of less than 600 g/mol is greater than 5 weight %, based on the total resin solids of the coating composition that forms the topcoat layer.

The invention relates to a polyisocyanate mixture comprising a polyisocyanate component A) having aliphatically and/or cycloaliphatically bonded isocyanate groups and a polyisocyanate component B) having araliphatically and/or aromatically bonded isocyanate groups, characterized in that the polyisocyanate component A) comprises at least 0.85% by weight of sulfonate groups (calculated as SO.sub.3; molar weight=80 g/mol) in chemically bonded form and the proportion of the polyisocyanate component B) is 7 to 43% by weight of the total amount of the components A) and B). The invention further relates to the use thereof and also coating compositions comprising the polyisocyanate mixture and also the substrates coated with these coating compositions.

Disclosed are a spiral coated stent with controllable gradient degradation, a preparation method thereof and an application thereof. The spiral coated stent with controllable gradient degradation is composed of a degradable medical polyurethane and a degradable magnesium alloy material, wherein the degradable medical polyurethane contains a following chemical structure: PCL-PEG-PCL, wherein a molecular weight of the PEG is 200 to 1,000 and the molecular weight of the PCL is 200 to 10,000, and the degradable magnesium alloy material is of a spiral stent structure; and physical properties of the spiral coated stent with controllable gradient degradation need to satisfy the following technical parameters that: a breaking strength needs to be no less than 1 N, a pressure resistance needs to be no less than 2 N, and a degradation characteristic of the magnesium alloy after surface treatment shows gradient degradation with different time.

Disclosed are a spiral coated stent with controllable gradient degradation, a preparation method thereof and an application thereof. The spiral coated stent with controllable gradient degradation is composed of a degradable medical polyurethane and a degradable magnesium alloy material, wherein the degradable medical polyurethane contains a following chemical structure: PCL-PEG-PCL, wherein a molecular weight of the PEG is 200 to 1,000 and the molecular weight of the PCL is 200 to 10,000, and the degradable magnesium alloy material is of a spiral stent structure; and physical properties of the spiral coated stent with controllable gradient degradation need to satisfy the following technical parameters that: a breaking strength needs to be no less than 1 N, a pressure resistance needs to be no less than 2 N, and a degradation characteristic of the magnesium alloy after surface treatment shows gradient degradation with different time.

The present invention pertains to a polyurethane fluoropolymer [polymer (F.sub.p)] obtainable by reacting: (i) at least one fluoropolymer [polymer (F)] comprising one or more recurring units derived from at least one (meth)acrylic monomer [monomer (MA)] having formula (I) here below: wherein: R.sub.1, R.sub.2 and R.sub.3, equal to or different from each other, are independently selected from a hydrogen atom and a C.sub.1-C.sub.3 hydrocarbon group, R.sub.H is a C.sub.1-C.sub.10 hydrocarbon group comprising from 1 to 5 hydroxyl groups, x being an integer comprised between 1 and 5, and, optionally, comprising one or more functional groups selected from double bonds, epoxy, ester, ether and carboxylic acid groups, with (ii) at least one isocyanate compound comprising at least one isocyanate functional group [compound (I)], (iii) optionally in the presence of one or more chain extenders, said polyurethane fluoropolymer [polymer (F.sub.p)] comprising at least one bridging group having formula (a) here below: wherein: R.sub.H is a C.sub.1-C.sub.5 hydrocarbon group comprising from 1 to 5 urethane moieties, x being an integer comprised between 1 and 5, and, optionally, comprising one or more functional groups selected from double bonds, epoxy, ester, ether and carboxylic acid groups. The invention also pertains to a process for the manufacture of said polymer (F.sub.p) and to uses of said polymer (F.sub.p). ##STR00001##