Bonding/Adhesion Promoters
Bonding/adhesion promoters are designed to help rubber compounds form
permanent bonds to non-rubber portions, fbers, fabrics and metals. Akrochem’s
bonding/adhesion promoter resins for this application and others like it are as follows:
ELAZTOBOND A-250 (P-185)
A-250 is a modifed phenol-formaldehyde resin that has been developed as a
replacement for resorcinol-formaldehyde resins. In combination with a methylene
donor such as hexamethylenetetramine (AKROFORM® HMT-80/EPR/P) or
hexamethoxymethylmelamine (AKROSPERSE® HMMM-50/EPR/S) and silica, A-250
resin functions as an adhesion promoter. The A-250, hexa,and silica loadings typically
fall within the following ranges: 2-4, 1-4 and 10-25 phr, respectively. A-250 resin has
replaced straight resorcinol in many applications due to improved dispersibility and
health concerns. A-250 is especially important in polychloroprene fabric adhesion,
since normal resorcinol can scorch polychloroprene.
Bonding/Adhesion Promoters
Product
Ball & Ring Softening Point (°C)
Physical Form
Specifc Gravity
ELAZTOBOND A-250 (P-185)
100 - 110
Flake
1.25