MUMBAI, India, Sept. 28 -- Intellectual Property India has published a patent application (202641113416 A) filed by Indian Institute Of Technology Madras Iit Madras on September 22, 2026, for A Glycerol Free Bio-Based Polyurethane Foam Composition And The Method Of Preparation Thereof.
Inventors include Ethayaraja Mani; Dilip Kumar Shanmugam; and Srisowmeya Guruchandran.
The application for the patent was published on September 25, 2026, under issue no. 39/2026.
Abstract: Abstract A GLYCEROL FREE BIO-BASED POLYURETHANE FOAM COMPOSITION AND THE METHOD OF PREPARATION THEREOF [00121] The present invention relates to a glycerol free bio-based polyurethane foam composition. he present invention relates to a glycerol-free, bio-based polyurethane foam comprising castor oil and polyethylene glycol (PEG 400), developed for sustainable packaging and insulation applications. Conventional castor oil-based polyurethane foams may suffer from surface oil migration, resulting in tackiness, poor handling, and reduced structural stability. The invention addresses this limitation through optimized formulation and controlled isocyanate-to-hydroxyl (NCO) ratio, promoting improved incorporation of castor-oil-derived components into the polyurethane network without requiring external crosslinking agents such as glycerol. Water is used as a blowing agent, enabling foam formation under ambient or near-ambient conditions. The resulting foam exhibits a dry, non-tacky surface, stable cellular structure, adequate mechanical strength, and thermal stability. The glycerol-free formulation reduces processing complexity while maintaining high renewable content, providing a scalable and environmentally preferable alternative to conventional petroleum-based foams for protective packaging, cushioning, insulation, and logistics applications. Fig.1
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