Vinavil K60 Vinyl acetate homopolymer Vinavil Polyvinyl acetate emulsions & derivatives (PVAc…) >> PVAc homopolymers ADHESIVE >> Solvent based Vinavil solid homopolymers of vinyl acetate differ in degree of polymerization. Each product is identified by a code number directly related to the molecular weight of the product( Fikentscher constant). Vinavil solid homopolymers are available as translucent beads. Their most interesting property is their ability to adhere to an extremely wide range of substrates develloping strong adhesive bonds. Therefore they can be employed in the manufacture of adhesives, paints, and composition boards of various types. The films developed by Vinavil solid homopolymers are not affected by light. Their average refractive index is 1.462, that is, very close the glassone. They are neutral, not corrosive, and not toxic products. Vinavil solid homopolymers are insoluble in water. However, prolonged immersion may cause them to take up small quantities of water and swell. They are insoluble in mineral and vegetal oils, aliphatic hydrocarbons, turpentine and glycerol. They are readily soluble in a large number of solvents, as shown in table 2. To dissolve them in ethanol and isopropyl alcohol a certain amount (i.e., 5 and 12% respectively) of water must be added. Polymerization degree widely affect the solubility of Vinavil solid homopolymers. The viscosity of the solutions containing Vinavil solid homopolymers is depending of the degree of polymerization of the product, solvent used, and product concentration. When selecting the solvent to dissolve Vinavil solid homopolymer, the evaporation rates of individual solvent must be taken into account (table 2). For example, it is desirable to adopt a mixture of solvents with different evaporation rates in the manufacture of paints, especially of those to be applied by the spray method. Vinavil solid homopolymers can be mixed with plasticizers, resins, pigments, extenders, dyestuffs, etc. to obtain a wide range of final product formulations. Plasticizers can be incorporated in the formulation of the final product to increase its elasticity, flexibility, and adhesion as well as to lower its softening point, improve its resistance to moisture and to low temperatures, and make it combustion-resistant. The plasticizers usually specified to attain these objectives include n-butyl, isobutyl, methyl, ethyl, and benzybutyl phthalates; tricresyl phosphate; trichloroethyl phosphate; tributyl citrate and acetyltributyl citrate; etc. Natural and synthetic resins showing compatibility with Vinavil solid homopolymers include hydrogenated, oxidized, and esterified rosin; phenol-formaldehyde and cumarone-indene resins; phenol, urea, and melamine precondensates; chlorinated rubber; nitrocellulose; cellulose acetate butyrate containing no more than 30% of acetyl groups. All the above compounds and products impart hardness to the films and are useful to increase the initial tack of adhesives formulated with Vinavil solid homopolymers, and improve waterproofs and gloss of their films, etc. Complete compatibility for all the inorganic pigments that are usually employed in paints can be claimed for Vinavil solid homopolymers. As to organic pigments, compatibility testing is desirable before they are used. Extenders and fillers that can be safely specified with Vinavil solid homopolymers include calcium carbonate, calcium sulfate dihydrate, barium sulfate, bentonite, kaolin, quartz, mica, wood sawdust, and cork, as well as any other inert extender. The above additives can be added to Vinavil solid homopolymers as powder with stirring or by dissolving them in one of the solvents included in the final product formulation. COMPATIBILITY WITH ADDITIVES PLASTICIZERS NATURAL AND SYNTHETIC RESINS PIGMENT, EXTENDS, AND FILTER As adhesives, Vinavil solid homopolymers are used both in solution and as hotmelts to bond substrates of various types. Solvent-based adhesives can be used for direct bonding as such. They can also be used for heat-sealing after solvent evaporation. In this application, due account must be taken of the softening temperature of each Vinavil solid homopolymers (table 1). Addition of plasticizers, natural or esterified rosin, cumarone resin, terpene resin, etc. to Vinavil solid homopolymers is necessary when hotmelts are prepared from the latter. The main applications of hotmelts made with Vinavil solid homopolymers are book - and journalbinding and automatic packaging of various products. Vinyl acetate homopolymer. Possesses neutral, non corrosive and non toxic properties, good light stability and broad range of compatibility(plasticizers, resins, pigments, extenders, dyestuffs...). Provides adherence to a very wide range of substrates and devellops strong adhesive bonds. Application : solution adhesives.