Provided are a papermaking device having an excellent strength in which the unevenness in strength between its parts is suppressed, and a method for producing the papermaking device.

Also provided is a papermaking device for use in papermaking machine comprising at least one resin layer comprising polyurethane resin, wherein the polyurethane resin is obtainable by reacting a urethane prepolymer having an isocyanate group with a curing agent having an active hydrogen group, wherein the urethane prepolymer is obtainable by reacting a polyisocyanate compound comprising 2,4-tolylene-diisocyanate and/or 2,6-tolylene-diisocyanate with a polyol compound comprising one or more polyether polycarbonate diol(s).

A resin composition useful for additive manufacturing is provided, which resin composition may exhibit improved shelf life through inhibition of crystallization. Such resin composition may include a crystallization inhibitor as taught herein, and/or a prepolymer produced by reaction of an isocyanate with multiple isomers and comprising a lower percentage of the structurally symmetric isomer. Methods of forming a three-dimensional object using such resin composition are also provided.

A resin composition useful for additive manufacturing is provided, which resin composition may exhibit improved shelf life through inhibition of crystallization. Such resin composition may include a crystallization inhibitor as taught herein, and/or a prepolymer produced by reaction of an isocyanate with multiple isomers and comprising a lower percentage of the structurally symmetric isomer. Methods of forming a three-dimensional object using such resin composition are also provided.

A method for preparing a polyol comprises the following steps of: (1) dissolving 2,3 -epoxybutane and an acid catalyst in an inert solvent to obtain a solution A; dissolving triethylene glycol in an inert solvent to obtain a solution B; and dissolving epoxy vegetable oil in an inert solvent to obtain a solution C; (2) respectively and simultaneously pumping the solutions A and B into a first micromixer for mixing; (3) pumping the solution C and an effluent of the first microreactor into a second micromixer for mixing while carrying out step (2); and (4) dissolving the vegetable oil polyol in an inert solvent to obtain a solution D; dissolving epoxypropane and an alkaline catalyst in an inert solvent to obtain a solution E; and pumping the solution D and the solution E into a tank reactor for reaction, thereby obtaining the polyol.

HCFO-containing isocyanate-reactive compositions, foam-forming compositions containing such isocyanate-reactive compositions, rigid PUR-PIR foams made using such foam-forming compositions, and methods for producing such foams, including use of such foams as insulation in discontinuous foam panel applications. The isocyanate-reactive composition includes a polyol blend, a blowing agent composition, and a tertiary amine catalyst. The polyol blend includes: (1) an aromatic polyester polyol having a functionality of 1.5 to less than 2.5 and an OH number of 150 to 360 mg KOH/g; (2) an aromatic polyester polyol having a functionality of at least 2.5 and an OH number greater than 360 mg KOH/g, which is present in an amount of at least 10% by weight, based on the total weight of the aromatic polyester polyol in the polyol blend; and (3) an amine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4. The blowing agent composition includes a hydrochlorofluoroolefin and a carbon dioxide generating chemical blowing agent.

Provided herein is a method of producing a polyurethane foam. The method includes dispersing turbostratic graphene in a polymerization solution. The polymerization solution includes a first component for polymerization into a polymer. The method includes adding a second component for polymerizing with the first component to chemically convert the polymerization solution into a polyurethane foam. Provided herein is also a polyurethane foam which includes a turbostratic graphene and a polymer formed from the polymerization of a polyol with an isocyanate. Provided herein is also a turbostratic graphene dispersion which includes a turbostratic graphene and a solvent for dispersing the turbostratic graphene.

The present disclosure provides a resin composition for a golf ball cover. The resin composition includes a thermoplastic polyurethane resin including 55 to 70 parts by weight of a polyol, 30 to 40 parts by weight of an isocyanate, and 0.2 to 0.4 parts by weight of a polysiloxane. The polysiloxane includes at least one hydroxyl group or a carboxyl group in the terminal alkyl group. The polyol and the isocyanate constitute a silicone-free thermoplastic polyurethane resin, and the polysiloxane and the isocyanate constitute a thermoplastic polyurethane resin that includes silicone in the main chain, thereby improving the scuff resistance and slip property required for a golf ball cover.

The invention relates to a process for preparing a derivatized polysaccharide and stable isocyanate-based dispersions comprising derivatized polysaccharide.

The present disclosure provides a resin composition for a golf ball cover. The resin composition includes a thermoplastic polyurethane resin including 55 to 70 parts by weight of a polyol, 30 to 40 parts by weight of an isocyanate, and 0.2 to 0.4 parts by weight of a polysiloxane. The polysiloxane includes at least one hydroxyl group or a carboxyl group in the terminal alkyl group. The polyol and the isocyanate constitute a silicone-free thermoplastic polyurethane resin, and the polysiloxane and the isocyanate constitute a thermoplastic polyurethane resin that includes silicone in the main chain, thereby improving the scuff resistance and slip property required for a golf ball cover.

A rigid foam having increased flame retardance comprises the reaction product of an isocyanate component and an isocyanate-reactive component. The isocyanate component and an isocyanate-reactive component are reacted in the presence of an isocyanurate catalyst component and a carbodiimide catalyst component. The isocyanurate catalyst component comprises 1,3,5-tris(3-(dimethylamino)propyl)-hexahydro-s-triazine and the carbodiimide catalyst component comprises 3-methyl-1-phenyl-2-phospholene-1-oxide. A method of forming the rigid foam on a surface comprises the steps of providing the isocyanate component, providing the isocyanate-reactive component, providing the isocyanurate catalyst component, providing the carbodiimide catalyst component, and spraying the isocyanate component, isocyanate-reactive component, isocyanurate catalyst component, and carbodiimide catalyst component onto the surface to form the rigid foam on the surface.