Modified lignin products for rigid foams

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12173160
APP PUB NO 20240174861A1
SERIAL NO

18432603

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Abstract

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Modified lignin products, processes for making them, and their use to produce rigid polyurethane or polyisocyanurate foams are disclosed. The processes comprise heating a lignin source with a nitrogen source and a starved concentration of a C1-C5 aldehyde to give a reaction mixture comprising a Mannich condensation product, neutralizing the reaction mixture, and isolating the modified lignin product. The process is performed at a mass ratio of lignin source to nitrogen source within the range of 1:1 to 1:5 and at a molar ratio of nitrogen source to C1-C5 aldehyde within the range of 3.5:1 to 1:1. Polyol blends and performance additives that contain the modified lignin products are described. Rigid foams that process well and incorporate up to 60 wt. %, based on the amount of polyol component, of the modified lignin contribute to excellent flame retardancy and low-temperature R-value performance.

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Patent Owner(s)

Patent OwnerAddress
MCPU POLYMER ENGINEERING LLC708 S TEMESCAL SUITE 101 CORONA CA 92879

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Garrett, Thomas M Corona, US 18 69
Maiti, Swarup Kumar Pittsburg, US 2 0

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