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:
Mar. 25, 2014
Filed:
Mar. 18, 2010
Zhendong Zhao, Nanjing, CN;
Yuxiang Chen, Nanjing, CN;
Liangwu BI, Nanjing, CN;
Yan Gu, Nanjing, CN;
Dongmei LI, Nanjing, CN;
Jing Wang, Nanjing, CN;
Yanju LU, Nanjing, CN;
Zhendong Zhao, Nanjing, CN;
Yuxiang Chen, Nanjing, CN;
Liangwu Bi, Nanjing, CN;
Yan Gu, Nanjing, CN;
Dongmei Li, Nanjing, CN;
Jing Wang, Nanjing, CN;
Yanju Lu, Nanjing, CN;
Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu, CN;
Abstract
A method for preparing pimaric acid type resin acids includes the following steps: step (1) adding refined resin acid, turpentine, or rosin along with maleic anhydride at a mass ratio of 1:0.3-1.5 into a reaction bottle, dissolving the ingredients into a C-Clower fatty acid solvent, the mass ratio of the C-Clow fatty acid to refined resin acid is 0.05-30:1, then carrying out additional reaction by heating directly or with assistance of a microwave, subsequently cooling, crystallizing, filtering, and washing; and step (2) combining the filtrates collected in step (1), stripping the solvent by vacuum distillation to obtain pimaric acid type resin acid coarse product, dissolving the resulting coarse product in NaOH aqueous solution to prepare aqueous solution of pimaric acid type resin acid salt, adjusting the pH level to 6-14 with a mineral acid or an organic acid while stirring, and either directly purifying or acidifying followed by purifying, the resulting precipitation to obtain the final product. The method has the characteristics of high yield, high product content, low cost, and low environmental pollution.