Emulsion copolymerization latices for interior and exterior coatings

Abstract

Details the preparation of emulsion copolymerization of styrene (St)‐vinylacetate (VAc) with different molar ratio 33:67(A1), 50:50(A2) and 67:33(A3) using redox initiator system (k2S208/NaHS03) and investigates their film forming. Finds that the drying film characterization took on a brittle property which is attributed to the nature of styrene polymers. Explains that molar ratio 67:33 from butyl acrylate (BuA‐VAc) and vinyl acetate (B1, B2 and B3) in the presence of pluronic F87 was chosen as the coemulsifier as it gives good transparent and elastic film properties but has a tacky character owing to the nature of butyl acrylate polymer. Shows that styrene‐butylacrylate (St‐BuA) 67:33 molar ratio(C) has high conversion and a solid content of 51 per cent, and its film forming gives a transparent sheet that dries within 45 minutes. Notes that incorporation of these latices into interior and exterior coatings gives good characterization (hardness, ductility, adhesion and washability of 4,042 cycles) compared with the standard specifications for evaluation of latex paint.

The Next Generation of Colloidal Probes: A Universal Approach for Soft and Ultra‐Small Particles

“…CML particles represent a model system for colloids synthesized by emulsion polymerization . Such particles are an essential part of many industrial formulations as their surface chemistry can be easily modified for specific applications . The SEM image in Figure a shows several CML particles, which have been deposited onto a silicon wafer.…”

“…As small colloidal particles are increasingly used in paints or adhesion promoters, their interfacial behavior represents an essential parameter for optimizing the formulations. Thus, the ability to determine adhesion forces on the level of single nanoparticles becomes increasingly important.…”

“…For the first time, we prepare colloidal probes from latex particles with a diameter in the order of 300 nm. Such particles represent a model system for the wide class of small colloidal particles prepared by emulsion polymerization, which are extensively used in industrial formulations, in particular after surface modification . Moreover, we demonstrate that also core–shell particles with rigid cores and soft, deformable hydrogel shells are accessible as colloidal probes by means of the FluidFM‐technology.…”

State of research and trends in development of wood adhesives

“…Liu and Xu (2000) introduced vinyl acetate as a raw material, PVA glue for protection, acid methyl ester as a modifier and discussed the effect of their different ratios on PVAc properties. Ayoub (1997) used a persulfate, sulfite oxidation-reduction system as initiator and studied different molar ratios (33:67, 50:50, 67:33) of copolymers of styrene/ vinyl acetate to form a thin fi lm process.…”