METHOD FOR IMPROVING CRACK RESISTANCE OF POLYISOCYANURATE-CONTAINING REACTION PRODUCTS Russian patent published in 2018 - IPC C08G18/08 C08G18/09 C08G18/12 C08G18/48 C08G18/22 C08G18/32 C08G18/42 C08L75/06 

FIELD: chemistry.

SUBSTANCE: present invention relates to curable composition for preparation of polyisocyanurate-containing products, obtained by combining and mixing with an isocyanate index of at least 100: (a) polyisocyanate composition, (b) composition reactive with an isocyanate and containing at least 50 % (mole), preferably at least 70 % (mole), more preferably at least 90 % (mole) of the diols based on the total number of moles of the compounds, reactive with respect to the isocyanate in the isocyanate-reactive composition, (c) additive that increases impact resistance and contains acrylic block copolymers, (d) trimerization catalyst composition and (e) optionally additional additives and/or auxiliary compounds, wherein the amount of polyisocyanates in the curable composition is at least 50 % by weight of polyisocyanates based on the total weight of the reactive curable composition, where the block copolymer additive that increases the impact resistance is a self-assembled block copolymer, wherein at least one block is a polyisocyanate-/polyisocyanurate-blend block, having a glass transition temperature (T_g) more than 100 °C, and at least one block is a polyisocyanate/polyisocyanurate-not-miscible block, characterized by the value of T_g below 0 °C. Method for preparing the above composition is also provided, process for the preparation of polyisocyanurate-containing materials from such a composition and the polyisocyanurate-containing materials themselves obtained by the method of the invention.

EFFECT: technical result is development of curable composition for preparation of structural polyisocyanurate-containing composite materials characterized by a glass transition temperature > 100 °C and significantly improved crack resistance, while maintaining other key technological and operational characteristics, such as viscosity and modulus of elasticity.

21 cl, 3 dwg, 3 ex, 2 tbl