Open celled foam and method of making an open celled foam

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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Details

521183, 521184, 521189, C08J 902, C08G 1834

Patent

active

059198338

ABSTRACT:
A lightweight open celled foam, having a density no greater than 6 pounds per cubic foot (pcf) and a ratio of imide to amide groups greater than 1 to 1 and no greater than 19 to 1, is the reaction product made from an organic polyisocyanate having at least two functional groups per molecule and a mixture of a difunctional acid and a difunctional anhydride in the presence of a tertiary amine catalyst and a nonionic, organic surfactant having a hydrophilic/lipophilic balance (HLB) of at least 12, with the reactants generating carbon dioxide during the manufacturing process.

REFERENCES:
patent: 4604409 (1986-08-01), Gagliani et al.
patent: 5093457 (1992-03-01), Zechier et al.

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