METHOD OF PRODUCING ETHER URETHANE ACRYLATE OLIGOMER Russian patent published in 2015 - IPC C08G18/34 C08G18/48 C08G18/76 C08F18/24 C08G18/10 

FIELD: chemistry.

SUBSTANCE: method of producing an ether urethane acrylate oligomer is carried out by reacting monomethacrylate ether of ethylene glycol with an isocyanate-containing prepolymer SKU-PFL-100, the method being characterised by that the prepolymer SKU-PFL-100 after loading is mixed and heated at 25-30°C for 10-20 minutes, wherein dibutyltin dilaurate is added to the prepolymer in the form of a solution in monomethacrylate ether of ethylene glycol gradually in portions of 1/4-1/5 of the total weighed portion with an interval of 15 minutes between portions; after loading the last portion, the mixture is stirred at 25-30°C for 15 minutes, temperature is then raised to 35-60°C, followed by stirring for 5.0 hours until isocyanate groups are exhausted in the finished oligomer. The oligomer obtained using the method is a transparent mass with a light-yellow to light-brown colour and viscosity of 200-300 Pa·s.

EFFECT: maintaining stability of processing properties for more than 1 year, compositions based on said oligomer are characterised by improved operational characteristics.

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