申请人:NESTE CHEMICALS OY
公开号:WO2000023495A1
公开(公告)日:2000-04-27
The invention relates to unsaturated polyester resins with higher molecular weight, low viscosity and high solubility specially in reactive diluents. The invention also relates to a method for manufacture of such unsaturated polyester resins and to use thereof in various applications such as gelcoats. The unsaturated polyester resin comprises 20-85 wt.% of at least one unsaturated polyester having a molecular weight of 2000-6000, prepared from 1) 30-70 mol%, preferably 40-60 mol% of at least two unsaturated carboxylic acids or derivatives thereof and at least one of them is an unsaturated aromatic carboxylic acid or a derivative thereof and optionally of one or more carboxylic acids and derivatives thereof, 2) 30-70 mol%, preferably 40-60 mol% of at least two diols and at least one of them is an aliphatic branched diol, preferably 2,2,4-trimethyl-1,3-pentanediol and/or 2-butyl-2-ethyl-1,3-propanediol and the amount of the aliphatic branched diol/diols is 0.5-8 mol%, preferably 2-6 mol%, 3) 0.5-10 mol%, preferably 2-6 mol% of at least one monoalcohol, 4) optionally a modifying chemical/chemicals and the total amount of monoalcohols and modifying chemicals is 0.5-20 mol%, preferably 1-15 mol%, 5) optionally 0.5-20 mol%, preferably 1-10 mol% of a polyhydric alcohol/alcohols having at least three hydroxyl groups, and 15-50 wt.% of at least one reactive diluent.