Celvol MH-82 Tackified polyvinyl alcohol Celanese Polyvinyl alcohol (PVOH) ADHESIVE Celvol polyvinyl alcohol combines high tensile strength with ease of film formation. Additionally, Celvol resins show excellent adhesive and bonding characteristics. Partially hydrolyzed grades have better adhesion to hydrophobic surfaces. The degree of hydrolysis affects the water sensitivity of both the resin and film. Water resistance increases with increasing hydrolysis. The super hydrolyzed grades should be used when maximum water resistance and humidity resistance are desired. Celvol polyvinyl alcohol resins are generally unaffected by greases, petroleum hydrocarbons and animal or vegetable oils. Resistance to organic solvents increases with the degree of hydrolysis. Celvol polyvinyl alcohol film can be plasticized with glycerol or the lower molecular weight glycols. These materials generally act as humectants, holding water in the film. Polyvinyl alcohol adheres particularly well to cellulosic substrates such as paper and wood. Adding it to a polyvinyl acetate emulsion will increase the efficiency as well as the tensile strength of the resulting adhesive. Solid Fiber Laminating. Tackified polyvinyl alcohol, produced through the boration of super and fully hydrolyzed grades, is used to provide a tailored degree of wet tack, set speed, viscosity and penetration into the substrate. Tackified polyvinyl alcohol allows high levels of extender, such as clay, to be added to the formulation. Tackified grades derived from fully hydrolyzed polyvinyl alcohol provide a combination of good pot life and excellent water resistance. Tube and Core Winding. Similar to solid fiber laminating. Polymer emulsion may be added to boost solids and set speed and lower viscosity. Applications: solid fiber laminating, tube and core winding and high performance wood. Tackified polyvinyl alcohol resin produced through boration of fully hydrolyzed grades. Used as the major component in adhesives. Provides high tensile strength, ease of film formation, very good adhesion to cellulosic substrates such as paper and wood and bonding characteristics. Shows resistance to greases, petroleum hydrocarbons and animal or vegetable oils, and to organic solvents. Provides tailored degree of wet tack, set speed, viscosity and penetration. Allows high levels of extender such as clay. Offers good pot life and very good water resistance. Applications: solid fiber laminating, tube and core winding and high performance wood.