A curable resin composition containing: a curable resin; and a curing agent containing an imide oligomer, the imide oligomer containing an aliphatic diamine residue- and/or aliphatic triamine residue-containing imide oligomer that has, in a main chain, an imide skeleton and a substituted or unsubstituted aliphatic diamine residue having a carbon number of 4 or greater and/or a substituted or unsubstituted aliphatic triamine residue having a carbon number of 4 or greater, has a crosslinkable functional group at an end, and has a molecular weight of 5,000 or less. The curable resin composition is excellent in flexibility and processability before curing and excellent in adhesiveness, heat resistance, and dielectric characteristics after curing. An adhesive, an adhesive film, a circuit board, an interlayer insulating material, and a printed wiring board each produced using the curable resin composition are also provided.

The present invention relates to innovative catalysts for producing oligomeric polyisocyanates. These catalysts comprise polyhedral silsesquioxanes to which cyclic phosphorus(III) or phosphorus(V) compounds have been coupled.

A polycarbodiimide compound represented by the following general formula (1):

##STR00001##

wherein R.sup.1 and R.sup.3 each represent a residue of an organic compound having one isocyanate-reactive functional group but excluding the isocyanate-reactive functional group, and R.sup.1 and R.sup.3 may be the same as or different from each other; R.sup.2 comprises a group represented by the following formula (i), which is a divalent residue of 2,4-diphenylmethane diisocyanate having isocyanate groups removed therefrom, and a group represented by the following formula (ii), which is a divalent residue of 4,4-diphenylmethane diisocyanate having isocyanate groups removed therefrom; the proportion of the groups represented by the formula (i) relative to all the R.sup.2 groups in the polycarbodiimide compound is 30 to 70 mol %, and the proportion of the groups represented by the formula (ii) relative to all the R.sup.2 groups in the polycarbodiimide compound is 30 to 70 mol %; X.sup.1 and X.sup.2 each represent a group formed by the reaction of the organic compound and isocyanate, and X.sup.1 and X.sup.2 may be the same as or different from each other; and n represents an integer of 2 to 50.

##STR00002##

A guanidine of the formula (I) and to the use thereof as catalyst for the crosslinking of a functional compound, especially a polymer having silane groups. The guanidine of the formula (I) described is preparable in a simple method via a polyfunctional carbodiimide adduct from the readily available raw materials, and is largely odorless at room temperature and of low toxicity. In spite of its comparatively high molecular weight, it accelerates the crosslinking of functional compounds surprisingly well, and such compositions do not have a tendency to migration-related defects such as separation, exudation or substrate soiling.

The polycarbodiimide composition is a reaction product of polyisocyanate having a primary isocyanate group with alcohol, wherein the alcohol contains at least one oxyethylene-containing alcohol containing an oxyethylene group, and at least one oxyethylene-noncontaining alcohol containing no oxyethylene group, the at least one oxyethylene-noncontaining alcohol has a solubility parameter of 11.20 (cal/cm.sup.3).sup.1/2 or less.

A ureido-pyrimidinone oligomer having the formula (I) wherein each Z is independently the same or different, and is a substituted or unsubstituted straight or branched chain C.sub.1-10 alkyl, each R.sup.1 is independently the same or different, and is a substituted or unsubstituted straight or branched chain C.sub.1-20 alkylene, substituted or unsubstituted C.sub.2-20 alkenylene, substituted or unsubstituted C.sub.3-8 cycloalkylene, or substituted or unsubstituted C.sub.6-18 arylene, each V is independently the same or different, and is a substituted or unsubstituted tetravalent C.sub.4-40 hydrocarbon group, each R is independently the same or different, and is a substituted or unsubstituted C.sub.1-24 divalent hydrocarbon group; and n has an average value of 2 to 50, preferably 3 to 40, more preferably 5 to 30.

##STR00001##

The present invention relates to processes for producing polymeric carbodiimides by addition of cesium salts and to polymeric carbodiimides produced by this process and to the use thereof as a hydrolysis inhibitor, especially in polyurethane (PU)-based systems, preferably thermoplastic TPU, PU adhesives, PU casting resins, PU elastomers or PU foams.

A flexible polyurethane foam article exhibiting flame resistance comprises the reaction product of an isocyanate and an isocyanate-reactive component comprising a polyol reactive with the isocyanate. The isocyanate and the isocyanate-reactive component are reacted in the presence of a blowing agent and a phospholene oxide. A method of producing the flexible polyurethane foam article includes the step of reacting the isocyanate and the isocyanate-reactive component in the presence of the blowing agent and an effective amount of the phospholene oxide to form the flexible polyurethane foam article which is flame resistant.

Described herein is a thermosetting resin composition, obtained from the reaction of at least: a polycarbodiimide (i), where the number of carbodiimide groups per molecule is in the range of from 1 to 10; a mixture of crystalline and amorphous polyols (ii), where the molar ratio of carbodiimide groups in the polycarbodiimide according to (i) to hydroxyl groups in the mixture according to (ii) is in the range of from 1:2 to 2:1 and where at least 25 weight-% of the mixture according to (ii) consists of at least one crystalline polyesterol, based on the overall weight of the mixture being 100 weight-%. Also described herein is a method of using the thermosetting resin composition as an adhesive, as well as processes for preparation of adhesives, an element including an adhesive layer on at least one substrate, and an adhesive film, obtained from one of the processes.

The present invention relates to processes for producing polymeric carbodiimides by addition of cesium salts and to polymeric carbodiimides produced by this process and to the use thereof as a hydrolysis inhibitor, especially in polyurethane (PU)-based systems, preferably thermoplastic TPU, PU adhesives, PU casting resins, PU elastomers or PU foams.