Umex products are a series of acid modified low-molecular-weight polyolefin containing a carboxylic acid anhydride group as the functional group. These products have a higher degree of modification and lower melt viscosity compared with conventional acid modified polyolefin. These products impart high dispersibility to both pigments and fillers in resins, and the mixture readily adheres to other materials including paint film.

When Umex 1010 is added to a mixture of ethylene propylene rubber and polypropylene, the surface of the molded resin is modified. The contact angle of liquid on the molded resin also decreases. Consequently, adhesion of the resin to a high polar paint (melamine type, polyurethane type, etc.) is improved dramatically. When either Umex 100TS or Umex 110TS is added to hot melt adhesives, the workability of the adhesives is enhanced because their melt viscosity decreases compared with a mixture of a viscosity depressant (low molecular polyolefin type), including polyethylene wax, furthermore, the Umex products improve the peel strength and creep resistance.