Toughened Epoxy Composition for Laminate Fabrication
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Epoxy compositions can be toughened by the addition of a low molecular weight (3000-10,000) carboxyl terminated butadiene acryloninatrile copolymer (CTBN) (*j. A good way to introduce the CTBN is to pre-react it with an epoxy to form an adduct. This is then mixed with another epoxy and diluted prior to the addition of hardener and catalyst. On cure, the CTBN micro disperses to form a uniform two-phase dispersed second phase within the epoxy. If used to impregnate a glass fabric, the resulting nitrile-epoxy-glass structure will be significantly resistant to fracture, possess increased impact resistance and toughness, and adhere better with less internal stress.