Butofan NS 278 Carboxylated SBR BASF Styrene copolymer >> Styrene butadiene rubber, SBR ADHESIVE BUTOFAN NS 278 Carboxylated Styrene - Butadiene Latex. Soft elastic, clear, moderately tacky film. Provides for additional crosslinking and enhanced metal adhesion. Very good water and heat resistance. Carboxylated styrene-butadiene latex. Offers soft elastic, clear, moderately tacky film. Provides for additional crosslinking and enhanced metal adhesion. Offers good water and heat resistance.