POLYMER COMPOSITION Russian patent published in 2013 - IPC C08L63/02 C08G59/40 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compositions based on epoxy resins and latent curing agents and can be used as epoxy filling compounds, binding materials for fibre-glass, adhesives, coatings and other purposes. The epoxy component used is a mixture of aromatic and aliphatic epoxy resins in ratio of 96:4 to 20:80. The latent curing agent used is polyisocyanate - a mixture of isomers 4,4'-2,2' and 4,2'-diphenyl methane diisocyanate and their homologues of tri- and tetraisocyanates, whose aromatic rings are bound by methylene bridges. The methylene bridges are blocked by a mixture which consists of ε-caprolactam (A), methylpyrazole (B) and benzyl alcohol (C) in ratio A:B:C from 90:9:1 to 10:80:10. Blocking is carried out by stirring the molten reaction mass at temperature of 60-140°C for 40-180 minutes with the ratio of the isocyanate and blocking components ranging from 76:24 to 60:40. The ratio of the epoxy and isocyanate components in the composition is as follows (pts.wt): mixture of epoxy resins - 100, curing agent - 10-50.

EFFECT: invention enables to solve the problem of solubility of curing agents based on blocked isocyanates in epoxy resins and obtain compositions with improved strength properties and thermal deformation resistance of the cured polymer.

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