Polyvinyl acetate melting point

Other polymers that can provide delayed-tack adhesives include styrene-butadiene copolymers, polyvinyl acetate, polystyrene, and polyamides. Solid (crystalline) plasticizers for these adhesives include dicyclohexyl phthalate, diphenyl phthalate, A-cyclohexyl-p-toluene sulfonamide, and o/p-toluene sulfonamide. Adhesives with different heat-activation temperatures could be obtained because of the range of melting points available. Delayed-tack adhesives have a large number of uses, such as coating paper for labels on bread packages, cans, etc. 

Many accelerators are available as dust free dispersions, preferably in an ethylene-propylene diene terpolymer/polyvinyl acetate blend. These have the dual advantage of zero loss as dust when the pellets are crashed as they are mixed, and rapid incorporation into the compound due to their low melting point. These materials are of particularly value when the melting point of the dispersed chemical is relatively high and all show generally rapid dispersion rates, giving high batch-to-batch consistency. 

The spectrum of the first chemical component, the concentration profile ci resolved by MCR, and the 3D map of the generated matrix Xi =c x are shown in Fig. 12 the 3D map shows the decline of absorbance. The smallest peak at 1713 cm is due to the C=0 stretching vibration it is clear that PVA itself does not contain a C=0 group. Because the production of a 100 mol% degree of saponification is technically difiicult [13], usually the small C=0 residual in polyvinyl acetate (PVAc, Fig. 6b) from the saponification reaction includes the C=0 band. However, it is not clear whether the small amoimt of residual PVAc groups show absorbance values close to 0.1 or not. Since the measurement of IR spectra began at 140 °C (at which point crystalline material starts to melt), there exists a possibility that some part of the PVA formed C=0 moieties via the... 

It is kix3wn that a melting point d ression results in a miscible blend. Paul and ccworkers32 34 recently reported such results for blends of polyvir lidene flixoride with various ca en-cemtaining polynners, such as polymethyl itethacrylate, polymethylacrylate, polyvinyl acetate, etc. Since in the present study novolac forms miscible blends with polyesterimide, similar depression of melting point of the blend was expected. On the contrary. 

Uniplex 260 is especially recommended for use in heat seal applications. It is blended into polyvinyl acetate based-adhe-slves at a temperature below the melting point. 

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