Patent ID: 9447280
Filing Date: 2016-09-20
CPC Classification: A23K,A23L,A61K,B27N,C07G,C08H,C08J,C08K,C08L,C09K,D21C,D21H,Y02P

Claim Text:
1. A method of producing an annual fibre lignin derivative having an aliphatic hydroxyl content of from about 1 mmol/g to 3.25 mmol/g, a normalized RSI of 15 or greater, and a weight average molecular weight of from about 500 g/mol to about 5000 g/mol, comprising: a) pulping an annual fibre biomass by a pulping process selected from the group consisting of: steam explosion, acid hydrolysis, ammonia fiber expansion, autohydrolysis, sulphite pulping and modifications thereof, kraft process and modifications thereof, soda pulping and modifications thereof, and organosolv process; b) heating the pulp; c) maintaining the elevated temperature for 1 minute or longer; d) separating the cellulosic pulp from the lignin rich pulp; and e) recovering derivatives of native lignin, wherein the derivatives have an aliphatic hydroxyl content of from about 1 mmol/g to about 3.25 mmol/g, a weight average molecular weight of from about 500 g/mol to about 5000 g/mol, and a normalized RSI of 15 or greater.