MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202641093640 A) filed by Psg Institute Of Medical Sciences & Research; Psg College Of Arts & Science; and Psg Institute Of Technology And Applied Research on August 03, 2026, for Production Of Multifunctional Cardanol Based Soft Foam For Antimicrobial And Oil-Absorption Applicat.
Inventors include Dr. Appasamy Subasri; Dr. Khaja Najimudeen Mohamed Mydeen; Dr. Srinivasan Harinei; Dr. Tadury Madhukar Subbarao; and Dr. Muthukaruppan Alagar.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: The present invention deals with the production and characterization of tetrafunctional cardanol (TC) and polyfunctional cardanol-guaiacol (TCP) and their conversion into polyurethane soft foam. Among the varied nature of acid catalysts, temperature and reaction time used for the synthesis of tetra-functional cardanol (TC), the combination of HCI:H2SO4 (1:1) acid mixture at 65°C and 4 hours of reaction time are found to be the most suitable to obtain the Pr(Ala with the highest yield of 89% Similarly, among the varied nature of acid catalysts, temperature and reaction time used for the synthesis of polyfunctional cardanol (TCP) the combination of PTSA acid mixture at 85°C and 4 hours of reaction time are found to be the most suitable to obtain the product with the highest yield of 85%. The molecular mass of tetra- functional cardanol obtained from HAMS was found to be 1215.89 g/mol which coincides with the theoretical value calculated on the basis of their molecular structure which is 1215.09 g/mol. The curing temperature of TCP foam was found to be 177°C. The oil absorption capacity of TC and TCP foams from oil-water mixtures was found to be about 20 times. The efficiency of reusability of foams was found to be 10 times. The density of TCP foam was found to be 0.047 g/cm3. The value of WCA for TCP foam was found to be 148°. Also, the WCA of TCP foam after immersion in acidic media (pH 2- 4) and alkaline media (pH 10-12) is 145° and 144°, showing excellent stability of the TCP foam. The foam exhibits good chemical and environmental stability in acidic media (pH 2- 4), alkaline media (pli 10-12) and saline water with negligible mass loss ( 2%). The zone of inhibition of TCP foam against S. aureus was found to be greater than 22 mm. The zone of inhibition of TCP foam against E. coli was found to be greater than 18 mm. The minimum inhibitory concentration (MIC) of TCP foam against both gram positive and gram- negative bacteria were found to be lesser than 500 lig/mL. The present invention is considered as cutting-edge concept in the field of development of bio-based multifunctional polyols and their conversion into open cell structure foamed products for medical and environmental remediation applications.
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