The polyurethane resin composition contains, a polyisocyanate component containing p-MDI, a polyol component, an organic metal catalyst, and a reaction retardant represented by general formula (1) below, wherein the mole ratio of the reaction retardant relative to 1 mol of the organic metal catalyst is 0.50 or more and 2.50 or less. (in general formula (1), A represents an aliphatic ring or an aromatic ring, R.sup.1 represents a hydrocarbon group composing ring A, R.sup.2 represents an aliphatic hydrocarbon group bonded to ring A. R.sup.3 represents a hydrogen atom or alkyl group bonded to nitrogen atom included in ring A. R.sup.1 represents a hydrogen atom or carboxyl group bonded to ring A. m is 1 or 2, n is 0 or 1, and total of n and no is 2 or less.) ##STR00001##

The present disclosure provides a liquid-state reactive polyurethane adhesive, which includes a polyurethane prepolymer. The polyurethane prepolymer is blocked by an isocyanate group, and the polyurethane prepolymer is obtained by a polymerization reaction, a reactive monomer of the polymerization reaction includes a polyisocyanate, a polyol, a stabilizer, a catalyst and a hydrophobic filler. A functionality of the polyisocyanate is 2.4 to 3. A molecular weight of the polyol is 1000 to 8000, and the polyol has hydrolysis resistance. The stabilizer has a structure represented by formula (I). The catalyst has a structure represented by formula (II). Formula (I) and formula (II) are as defined in the specification.

A vat resin for three-dimensional stereolithography printing of a thiourethane polymer part comprising a liquid mixture including a first type of monomer, a second type of monomer, a photolatent base decomposable upon exposure to a light to form a non-nucleophillic base catalyst having a pKa greater than 7, an anionic step-growth polymerization reaction inhibitor having an acidic group configured to form an acid-base pair with the non-nucleophillic base and a light absorber having an absorbance in the liquid mixture that is greater than an absorbance of the photolatent base at a wavelength of the light used for the exposure. Methods of preparing the vat resin and three-dimensional stereolithography printing a thiourethane polymer part using the vat resin are also disclosed.

A method of three-dimensional stereolithography printing a thiourethane polymer part using the vat resin. Adding a resin to a vat of a three-dimensional stereolithography printer, the resin a liquid mixture including: a first type of monomer including two or more thiol functional groups, a second type of monomer including two or more isocyanate functional groups, a photolatent base, an anionic step-growth polymerization reaction inhibitor and a light absorber. The photolatent base is decomposable upon exposure to a light to form a non-nucleophillic base catalyst having a pKa greater than 7. The anionic step-growth polymerization reaction inhibitor has an acidic group configured to form an acid-base pair with the non-nucleophillic base. The light absorber has an absorbance in the liquid mixture that is greater than an absorbance of the photolatent base at a wavelength of the light used for the exposure.

A method for producing a prepolymer for the production of an integral polyurethane foam is provided. The prepolymer is or can be obtained by reaction of a composition that contains the following components: component A containing a polyoxymethylene-polyoxyalkylene block copolymer having a hydroxyl number of 20 mg KOH/g to 200 mg KOH/g as component Al, component B containing di- and/or polyisocyanates with an NCO content of 15 to 45 wt.-% relative to component B, 0.04 to 1.0 wt.-%, relative to the composition, a proton acid as component C, and optionally a component D that contains auxiliary agents, at a characteristic number of 450 to 850. The invention further relates to the prepolymer obtained by the method, to an integral polyurethane foam based on the prepolymer, and to the use thereof.

The invention relates to compounds and methods for extending the pot life of mixtures of isocyanates and isocyanate-reactive compounds when using acidic phosphoric acid ester as a mould release agent.

A rubber composition for downhole tools having excellent degradability and storability is provided. The rubber composition for downhole tools includes degradable rubber, a degradation accelerator, and a degradation inhibitor. The degradation accelerator is at least one type of the compound represented by Formula (I) or Formula (II) below. The degradation inhibitor is at least one type selected from the group consisting of carbodiimide compounds, oxazoline compounds, oxazine compounds, and epoxy compounds. The content of the degradation accelerator is from 0.1 to 20 parts by mass relative to 100 parts by mass of the degradable rubber. The content of the degradation inhibitor is from 0.1 to 3 parts by mass relative to 100 parts by mass of the degradable rubber.

The present disclosure relates generally to curable resins, in particular dual-cure resins, and related methods for use in an additive fabrication (e.g., 3-dimensional printing) device.

The polyurethane resin composition contains a polyisocyanate component containing p-MDI, a polyol component, an organic metal catalyst, and a reaction retardant represented by general formula (1) below, wherein the mole ratio of the reaction retardant relative to 1 mol of the organic metal catalyst is 0.50 or more and 2.50 or less, (in general formula (1), A represents an aliphatic ring or an aromatic ring. R.sup.1 represents a hydrocarbon group composing ring A. R.sup.2 represents an aliphatic hydrocarbon group bonded to ring A. R.sup.3 represents a hydrogen atom or alkyl group bonded to nitrogen atom included in ring A. R.sup.4 represents a hydrogen atom or carboxyl group bonded to ring A. m is 1 or 2, n is 0 or 1, and total of n and m is 2 or less.)

##STR00001##

The present invention relates to a method that includes providing a formulation having an isocyanate-functional prepolymer and a curing component comprising an amino-functional aspartic ester of the general formula (I) ##STR00001##
applying the formulation to a cell tissue; and curing the formulation such that the loss of blood (haemostatic) or tissue fluids is staunched or leaks in cell tissues are sealed.