PREPREGS AND ARTICLES MOULDED THEREFROM Russian patent published in 2015 - IPC C08G18/10 C08G18/79 C08L75/04 C08J5/24 B32B5/02 B32B27/04 

FIELD: chemistry.

SUBSTANCE: invention relates to prepregs, a method for production and use thereof, as well as a method of making components from composite material using said prepregs. The prepregs are made of A) at least one type of reinforcing fibres and B) at least one powdered polyurethane composition as a matrix material. Component B) contains: a) at least one urethdione group-containing curing agent based on products of polyaddition of aliphatic, (cyclo)aliphatic or cycloaliphatic polyisocyanates with urethdione groups and compounds with hydroxyl groups, which is in solid state at temperature below 40°C, in liquid state above 125°C and contains less than 5 wt % free NCO-groups and 3-25 wt % urethdione groups; b) at least one polymer with hydroxyl groups which is in solid state at temperature below 40°C, in solid state above 125°C and has a hydroxyl number of 20-200 mg KOH/g. Components a) and b) are used in a ratio of one hydroxyl group in component b) per 0.3-0.7 urethdione group in component a).

EFFECT: producing technologically effective, nontoxic polyurethane-based prepregs.

18 cl, 4 dwg