METHOD OF PRODUCING LONG FIBRE-REINFORCED POLYURETHANES CONTAINING GRANULAR FILLER Russian patent published in 2015 - IPC C08G18/32 C08G18/42 C08G18/48 C09J175/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing long fibre-reinforced polyurethanes which also contain granular filler. Described method of producing a fibre-reinforced polyurethane or polyurethane-urea composite, which includes placing 2.54-10.2 cm fibres soaked with a curable polyurethane- and/or polyurea-forming composition into a mould or casting form and curing the curable composition in the mould or casting form to obtain a cured polyurethane or polyurethane-urea polymer reinforced with fibres, wherein the curable composition is obtained by mixing a polyol component, which includes at least one polyol, and at least one granular filler, and a polyisocyanate component which includes a urethane group-containing MDI or polymeric MDI, and wherein (1) the granular filler makes up about 10 to 60 wt % of the curable composition and (2) the calculated molecular weight between cross-links of the cured polyurethane or polyurethane-urea is about 300 to 420.

EFFECT: obtaining a fibre-reinforced polyurethane or polyurethane-urea composite having good physical and thermal properties, particularly resistance to formation of bubbles under the effect of temperature in the range of 80 to 100°C, and having a good surface appearance.

11 cl, 4 tbl, 9 ex