US 12,110,346 B2
Method of producing phosphoric acid crosslinked starch
Fumihiko Sano, Tokyo (JP); Kazuya Ikeshima, Tokyo (JP); Akiko Asano, Tokyo (JP); and Akiko Tamagawa, Tokyo (JP)
Assigned to OJI HOLDINGS CORPORATION, Tokyo (JP)
Appl. No. 17/251,067
Filed by OJI HOLDINGS CORPORATION, Tokyo (JP)
PCT Filed Jun. 14, 2019, PCT No. PCT/JP2019/023685
§ 371(c)(1), (2) Date Dec. 10, 2020,
PCT Pub. No. WO2019/240267, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 2018-114168 (JP), filed on Jun. 15, 2018.
Prior Publication US 2021/0246230 A1, Aug. 12, 2021
Int. Cl. C08B 31/00 (2006.01); A23L 29/219 (2016.01); A23L 33/125 (2016.01)
CPC C08B 31/003 (2013.01) [A23L 29/219 (2016.08); A23L 33/125 (2016.08); A23V 2002/00 (2013.01)] 14 Claims
 
1. A method of producing phosphoric acid crosslinked starch, comprising:
adding phosphorus oxychloride sequentially to raw starch slurry under a condition of pH 9 to 12, to cause the raw starch to undergo a phosphoric acid crosslinking reaction, and
controlling the pH by sequentially adding an alkaline solution,
wherein concentration of the alkaline solution is increased stepwise or continuously between start and end of the phosphoric acid crosslinking reaction,
concentration of the raw starch in the raw starch slurry is 30 to 45% by mass, total mass of the phosphorus oxychloride added is 12% by mass or more based on dry mass of the raw starch, and concentration of the starch in the reaction liquid at the end of the reaction is 15% by mass or more,
the alkaline solution is an aqueous NaOH solution, and concentration of the aqueous NaOH solution is increased from 2 to 4% by mass to 11 to 20% by mass from the start of the reaction to the end of the reaction.