Hydroxyl polyester resins with high Tg

摘要

The present invention relates to an amorphous polyester containing hydroxyl groups and prepared from an acid constituent comprising from 0,1% to 100% moles of isophthalic acid or terephthalic acid, from an alcohol constituent comprising from 0 to 40% moles of neopentylglycol, from 0 to 40% moles of at least one dihydroxylated compound other than neopentylglycol and from 60 to 100% moles of polyhydroxylated compound containing at least 3 hydroxyl groups and from 0,1 to 10% moles of aliphatic, cycloaliphatic, containing trimethylolethane (TME the said amorphous polyester having a glass transition (Tg) of at least 60°C, and a hydroxyl number of 270 to 350 mgKOH/g, preferably 280 to, 310 mgKOH/g.