公开(公告)号：US20160332949A1

公开(公告)日：2016-11-17

申请号：US15111258

申请日：2015-01-20

Applicant: RHODIA OPERATIONS

Inventor： Pierre ARDAUD ,  Thierry VIDAL ,  Rabih RACHED

IPC: C07C51/573 ,  C07C51/56

CPC classification number: C07C51/573 ,  C07C51/56 ,  C07C57/04

Abstract: The invention relates to a method for producing a (meth)acrylic anhydride A-C(═O)—O—(O═)C-A, comprising the following steps: a) a step of reacting an anhydride B—C(═O)—O—(O═)C—B with an acid A-COOH, resulting in the formation of mixed anhydride A-C(═O)—O—(O═)C—B and acid B—COOH; and b) a step of reacting the mixed anhydride with A-COOH, resulting in the (meth)acrylic anhydride. According to the invention, reaction steps (a) and (b) are carried out in the presence of hydrated triflic acid, and the anhydride A-C(═O)—O—(O═)C-A is isolated from the reaction medium produced in step (b) as follows: e1) heavy compounds having a volatility less than or equal to that of the anhydride A-C(═O)—O—(O═)C-A are separated from the reaction medium, said compounds including the anhydride and the hydrated triflic acid; e2) the anhydride is separated from the heavy compounds by difference in volatility.

Abstract translation: 本发明涉及一种制备（甲基）丙烯酸酐AC（= O）-O-（O =）CA的方法，包括以下步骤：a）使酸酐B-C（= O）-O - （O =）C-B与酸A-COOH反应，形成混合酸酐AC（= O）-O-（O =）C-B和酸B-COOH; 和b）使混合酸酐与A-COOH反应的步骤，得到（甲基）丙烯酸酐。 根据本发明，反应步骤（a）和（b）在水合三氟甲酸的存在下进行，并且从步骤（a）中产生的反应介质中分离酸酐AC（= O）-O- （b）如下：e1）具有小于或等于酸酐AC（= O）-O-（O =）CA的挥发性的重质化合物与反应介质分离，所述化合物包括酸酐和水合 三氟甲磺酸 e2）通过挥发性差异将酸酐与重质化合物分离。

公开(公告)号：US20190150354A1

公开(公告)日：2019-05-23

申请号：US16192952

申请日：2018-11-16

Applicant: RHODIA OPERATIONS

Inventor： Clara VERNAY ,  Jean-Christophe CASTAING ,  Zhiyun CHEN ,  Thierry VIDAL

IPC: A01C1/06 ,  C09D103/12 ,  C09D105/00

Abstract: A seed or seedling is coated with a cross-linked biopolymer and, optionally, a second binder selected from underivatized guar, cationic hydroxypropyl guar, polyacrylamide, poly(methacrylic acid), poly(acrylic acid), polyacrylate, poly(ethylene glycol), polyethyleneoxide, polyamide, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, underivatized starch, cationic starch, corn starch, wheat starch, rice starch, potato starch, tapioca, waxy maize, sorghum, waxy sarghum, sago, dextrin, chitin, chitosan, xanthan gum, carageenan gum, gum karaya, gum arabic, pectin, cellulose, hydroxycellulose, hydroxyalkyl cellulose, hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, or hydroxypropyl cellulose. The seed coating composition is characterized by a dust value, as measured using a Heubach dustmeter device, which is lower by at least 30% as compared to an analogous composition that does not contain the crosslinked biopolymer.