Amphiphilic functional polymers as polypropylene nonwoven surface treatment

Polypropylene nonwovens (PP NWs) are utilized commonly in baby diapers, adult incontinence products, feminine hygiene items, and wet wipes. Due to the inherent hydrophobic character of these NWs, their properties are significantly influenced by hydrophilic surface treatments to enhance both their performance and the user experience. Although polymer-based formulations offer great versatility, small molecule applications are more prominent in industry. This study proposes an amphiphilic functional polymer-based surface treatment for NW disposable hygiene products. Such polymer offers odor control, enzymatic inhibition, pH control, controlled release of active agents, and antimicrobial activity. This article discusses the synthesis of the as-utilized polymer, succinylated Poly(2-propyl-2-oxazoline-co-ethyleneimine) (S-PPrOZ-PEI), and its characterization by both Fourier-Transform Infrared Spectroscopy (FTIR) and Nuclear magnetic resonance (NMR). Additionally, the preparation of a dilute polymer-based aqueous formulation, and its utilization as a surface treatment to PP NWs are described here. S-PPrOZ-PEI modifies the PP NW surface through its hydrophobic interactions with PP and makes the surface more hydrophilic due to the presence of acid functional groups in its structure. The performance of the applied formulation is evaluated through contact angle measurements, and then they are compared to commercial small-molecule-based surface treatment formulations, which are found to be similar.