Vinyl-acrylic latex, durability

The coating durability of organolead-treated southern pine in exterior exposure was reported (144), Significant improvement in the durability of a vinyl-acrylic latex and an alkyd paint on treated wood was demonstrated. Improved durability appeared to be independent of the type or concentration of the organolead-treated compounds. 

Branched vinyl esters are strongly resistant to saponification, water absorption and UV degradation. Combining them with VAc and/or acrylate esters affords copolymers with improved water and alkali resistance, and exterior durability. Typically, about 15-30% VV-10 is used to optimize the cost-performance properties of such polymers. Intericn- latexes tend to contain 15-20% monomer. Exterior latexes usually contain 20-30% of the branched monomer. 

Fabrics that are woven together from thread or yam are referred to as textiles, whereas shorter fibres bound together in a random, porous fashion are called nonwovens. In either case, crosslinkable latexes are extensively used as binders to improve stability, durability, and chemical resistance (205), and flame retardance (413). Acrylic copolymers are the most common class of binders, although other copolymers, such as styrene-butadiene or ethylene-vinyl acetate (242, 255) copolymers are often used when required by cost (247) or performance. The softness (flexibility) or hardness (strength) of the fabric is controlled through the glass transition temperature of the latex binder. 

Latex The film forming resin which acts as the binder between the pigment particles and the substrate. Ethylene/vinyl acetate and styrene/acrylic polymers are well known, and additional monomers are sometimes utilised to obtain the optimum film forming, durability and gloss properties. 

Sealants and caulks based on vinyl acetate homo- and copolymers have been on the market since the late 1950s. Use of these lower-performance materials has been mostly in residential areas—bathtub caulking, wall tile joints, wallboard joints, etc. Latex caulks based on polyvinyl acetate plasticized with dibutyl phthalate, or on one of the newer vinyl acetate-acrylic emulsion copolymers, have the same ease of application as the acrylic emulsion caulks but are less flexible, harden on aging, and have inferior exterior durability. ... 

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