| abstract |
The invention relates to a process for producing solids made from polyisocyanurate plastics, comprising the following steps: (a) providing a polyisocyanate composition A) which contains oligomeric polyisocyanates and is low in monomeric polyisocyanates, where the isocyanurate structure content in the polyisocyanate composition A) is at least 50 mol %, based on the sum total of the oligomeric structures from the group consisting of uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione and oxadiazinetrione structure that are present in the polyisocyanate composition A); (b) catalytically trimerizing the polyisocyanate composition A), where (i) the catalytic trimerization is conducted at ambient temperatures of at least 80° C.; (ii) the catalytic trimerization is conducted within less than 2 hours at least up to a conversion level at which only at most 20% of the isocyanate groups originally present in the polyisocyanate composition A) are present; (iii) the catalytic trimerization takes place under quasi-adiabatic conditions which are characterized in that the material temperature at least one juncture is at least 10° C. above ambient temperature. The invention further relates to solids made from polyisocyanurate plastic, obtainable by the process of the invention. |