Precured unsaturated polyester resin laminate - contains peroxide activated by high temp., giving storable material which post cures to a strong, tough prod.

摘要

In laminates of paper and/or woven and/or nonwoven fabrics impregnated with unsatd. polyester resins, the resin is 40-80, pref. 50-70% cured and contains 0.2-4 pref. 0.5-2 wt % peroxide(s) (I) with a half life of min. 10 h at 100 degrees C pref. min 10 h at 120 degrees C. The laminate pref. is 0.3-4 esp. 0.5-3 mm thick. The laminates can be stored and transported under normal environmental conditions and can be moulded and post cured later, even after keeping for 6 months. The post cured prods. have very good flexural strength, toughness and puncture resistance and are resistant to abrasion and organic solvents and dimensionally stable. They can replace hard, resin-impregnated paper normally used in laminates and form a very good bond with prepregs.