N-octyl acrylate

A large number of organic acrylic ester polymer have been prepared in the laboratory. Poly (methyl acrylate) is tough, leathery and flexible. With increase in chain length there is a drop in the brittle point but this reaches a minimum with poly-(n-octyl acrylate) (see Figure 15.12.). The increase in brittle point with the higher acrylates, which is similar to that observed with the poly-a-olefins and the poly(alkyl methacrylate)s, is due to side-chain crystallisation. 

Both of these two adhesives are basic acrylic adhesives with simple compositions. A full or partial change of 2-ethylhexyl acrylate to n-octyl acrylate or butyl acrylate can modify the stiffness of the adhesive. The addition of vinyl pyrrolidone and/or vinyl acetate monomers can increase the solubility of drugs in the adhesive. Thus various acrylic adhesives can be designed according to the TDS formulation requirements. 

Methyl acrylate Acrylonitrile Methyl methacrylate Vinyl acetate Vinyl stearate Vinyl pelargonate Vinyl acetate Methyl methacrylate n-Butyl methacrylate n-Octyl methacrylate Methyl acrylate n-Butyl acrylate n-Octyl acrylate Vinyl chloride Vinyl bromide Vinyl iodide T etrachloroethy lene Maleic anhydride Maleic anhydride... 

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