The invention relates to potting compounds which cure to polyisocyanurate plastics, to the production of said potting compounds and to the use of the potting compounds for manufacturing electrical components.

The present invention provides bonding systems comprising a formaldehyde-based (urea-/melamine-/phenol-/resorcinol-formaldehyde or other combination) and/or a polymeric isocyanate resin system composition for bonding ligno-cellulosic materials to form panels and/or shaped products, which contain a resin hardener, also referred to as resin catalyst, characterised in that the hardener is activated by heat.

The present invention relates to novel thermolatent catalysts for the manufacture of isocyanurate and polyisocyanate polymers.

Provided are a method of preparing a polyurethane prepolymer with high functionality and the polyurethane prepolymer with high functionality prepared therefrom and a curing agent comprising the same. The method includes the steps of: Step (A): providing an alcohol composition comprising a first polyol having 2 or 3 OH groups and a second polyol having 4 or more OH groups; Step (B): reacting the alcohol composition with a polyisocyanate to undergo a first polymerization, so as to obtain an intermediate; wherein a molar ratio of a total number of the OH groups of the alcohol composition to a total number of NCO groups of the polyisocyanate is from 1:2 to 1:6; and Step (C): adding a catalyst to carry out a second polymerization of the intermediate to obtain the polyurethane prepolymer with high functionality, which has four or more NCO groups.

The present invention provides a coating film having a structure represented by the following general formula (1) (in the formula, R.sup.11 is a residue formed by removing one isocyanate group from a polyisocyanate, and R.sup.12 is an alkyl group or an alkoxy group having 2 to 12 carbon atoms, R.sup.13 is a residue formed by removing one hydroxyl group from a polyol), wherein a König hardness of the coating film is 20 or more, in an SS curve measurement of a tensile test, the coating film has an elastic deformation region and a plastic deformation region, and in the SS curve measurement, a stress at an inflection point stress between the elastic deformation region and the plastic deformation region is 5 MPa or more.

##STR00001##

The present invention relates to a polyisocyanate composition, comprising a mixture of ≥60 wt. %, relative to the total weight of the mixture, of at least one polyisocyanate based on pentamethylene diisocyanate and ≤40 wt. %, relative to the total weight of the mixture, of at least one polyisocyanate based on a cycloaliphatic diisocyanate and and/or of at least one polyisocyanate based on pentamethylene diisocyanate and at least one cycloaliphatic diisocyanate, the polyisocyanate composition having a residual monomer content of monomer diisocyanates below 0.5 wt. %, relative to the total weight of the polyisocyanate composition.

The problem addressed by the present invention is to provide an antifogging coating film having excellent antifogging property, antifogging persistence, persistence of appearance, and elution resistance. The coating film according to the present invention contains a metal oxide (A) and a hydrophilic compound (B); the height of the eluate by a coating film surface elution test is 1.0 μm or less; this test is carried out by placing 10 μL of deionized water on the coating film, allowing the film to stand for 24 hours in a 23° C., 50% RH environment, measuring the eluate height of 20 locations selected randomly within a 10 cm.sup.2 range on the coating film surface, and determining the maximum height; and the water contact angle measured after subjecting the coating film to a moisture resistance test by exposure for 24 hours in an 85° C., 85% RH environment followed by standing for one hour in a 23° C., 50% RH environment, is less than 40°. Preferably, the elution level per coating film unit volume by a coating film total elution test is 40 mg/cm.sup.3 or less, and this test is carried out by immersing the coating film in 23° C. deionized water for 24 hours, then measuring the weight of the coating film eluate recovered from the deionized water.

This disclosure generally provides polyfunctional isocyanate compositions and polyurethane compositions made thereof which has improved impact resistance, wherein the polyfunctional isocyanate composition comprising a polyfunctional isocyanate compound which is a derivative of an ether based diisocyanate; wherein the functionality of the polyfunctional isocyanate compound is 3.

The present invention provides a polyaspartic coating composition containing (A) an aspartic acid ester compound represented by the following formula (I) ##STR00001## [in formula (I), X is an n-valent organic group, and R.sub.1 and R.sub.2 are organic groups which are inert to the isocyanate group under a reaction condition, and n is an integer of 2 or more.], and (B) a polyisocyanate obtained by using one or more diisocyanate monomers selected from the group consisting of an aliphatic and alicyclic diisocyanate and a polycaprolactone polyol having a number-average molecular weight of 500 to 1,500, wherein a ratio of the polycaprolactone polyol is 20% by mass or more, and the polyisocyanate component contains 10.0% by mass or less of an isocyanurate trimer.

The present invention relates to the production of plastics by crosslinking of blocked polyisocyanates. The plastics obtainable are characterized in that they are substantially free of urethane groups and the crosslinking of the monomers is predominantly effected by isocyanurate groups.