abstract |
The present invention relates to aqueous sizing agents for glass fibers which contain, as film formers, epoxy group-containing polyesters with 4 to 13% by weight of polyethylene oxide units with molecular weights between approximately 370 and 3000 and 25 to 50% by weight polypropylene oxide units with molecular weights from 116 to approximately 2000. The invention further relates to sized glass fibers and glass fiber composite materials. |