US 12,441,887 B2
Partially saponified rice bran wax oxidates
Philipp Kratzer, Wertingen (DE); Manuel Broehmer, Gröbenzell (DE); and Rainer Fell, Gersthofen (DE)
Assigned to CLARIANT INTERNATIONAL LTD, Muttenz (CH)
Appl. No. 17/768,237
Filed by CLARIANT INTERNATIONAL LTD, Muttenz (CH)
PCT Filed Oct. 5, 2020, PCT No. PCT/EP2020/077782
§ 371(c)(1), (2) Date Apr. 12, 2022,
PCT Pub. No. WO2021/073909, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 19203444 (EP), filed on Oct. 15, 2019.
Prior Publication US 2024/0117186 A1, Apr. 11, 2024
Int. Cl. C08L 91/06 (2006.01); C11C 3/00 (2006.01)
CPC C08L 91/06 (2013.01) [C11C 3/006 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process for producing a partly saponified rice bran wax oxidate (V), comprising the steps of:
i) providing a rice bran wax (R) containing less than 20% by weight, based on the total weight of the rice bran wax (R), of polyesters formed from polyhydric alcohols and aliphatic carboxylic acids having 8 to 20 carbon atoms;
ii) providing a mixture (M) of chromium trioxide and sulfuric acid;
iii) performing the oxidation of the rice bran wax (R) by reacting the rice bran wax (R) with the mixture (M) while stirring at a temperature of 90 to 150° C., in order to obtain a reaction mixture containing rice bran wax oxidate (O);
iv) ending the reaction and leaving the reaction mixture obtained in step iii) to stand until an organic phase has separated from an aqueous phase;
v) separating off the organic phase;
vi) optionally removing residues containing chromium compounds from the organic phase in order to obtain the rice bran wax oxidate (O) in purified form;
vii) optionally repeating the sequence of steps ii) to vi) using the rice wax oxidate (O), optionally in purified form, rather than the rice bran wax (R); and
viii) saponifying the rice bran wax oxidate (O), optionally in purified form, by reacting it with a basic salt,
wherein no alcohol component is added to the reaction mixture in step iii) to step viii).