Production of cellulose acetate

Abstract

Abstract PURPOSE:To obtain cellulose acetate of an excellent hue even when a cellulose material of somewhat low quality must be used, by converting a cellulose material subjected to a specified swelling treatment into an acetate ester and saponifying the ester by aging. CONSTITUTION:1pt.wt. cellulose material such as low-grade viscose cellulose of a low alpha-cellulose content is poured into 5-45pts.wt. swelling agent such as dimethyl sulfoxide and swollen at room temperature - 100 deg.C for 1-150hr to an acetic acid content >=40wt%, separated from the liquid by centrifugation, washed with water and gently dried. This swollen cellulose material is converted into an acetate ester and saponified by aging.

Inventors

• 👤 Hiroyuki Nakamura
• 👤 洋之 中村
• 👤 Hiroshi Yokota
• 👤 横田　拓

Bibliographic Details