The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 1977
Filed:
Jan. 06, 1975
Wolfgang Schminke, Wiesbaden-Biebrich, DT;
Klaus Stolting, Wiesbaden-Biebrich, DT;
Hans Macholdt, Wiesbaden-Biebrich, DT;
Hans Kunkler, Wiesbaden-Biebrich, DT;
Hoechst Aktiengesellschaft, , DT;
Abstract
In the manufacture of cellulose glycolate, a reaction mixture comprising per 1 part by weight of cellulose 0.2 to 0.6 part by weight of sodium hydroxide, 0.5 to 1.75 parts by weight of sodium monochloroacetate, 7 to 22 parts by weight of isopropanol, and from 20% to 50% by weight, based on the weight of isopropanol, of water is subjected to shearing forces at a temperature less than 30.degree. C to effect intimate mixing and then reacted to cause etherification of the cellulose in a reaction area held at a temperature in the range of 60.degree. C to 90.degree. C and held constant within each section of the reaction area. The residence time of the mixture in the mixing zone is at most one-tenth of its residence time in the reaction area. The solid and liquid components of the reaction mixture after etherification are separated mechanically.