Polyvinyl chloride resin compositions and methods of preparation and use thereof for increasing the degree of whiteness in finished polyvinyl chloride foam. The resin compositions contain sulfur compounds selected from sulfonic acid derivatives, sulfinic acid derivatives, and mercapto acetic acid sodium salt, and optionally contain water soluble salts and/or t-butyl hydroperoxide.

Composições da resina do cloreto polyvinyl e métodos da preparação e do uso disso para aumentar o grau de whiteness na espuma terminada do cloreto polyvinyl. As composições da resina contêm os compostos de enxôfre selecionados dos derivatives ácidos sulfonic, dos derivatives ácidos sulfinic, e do sal do sodium do ácido acetic do mercapto, e contêm opcionalmente sais soluble da água e/ou o hydroperoxide t-t-butyl.