Flame-retardant, thermosetting foam product and method of preparing same
AssigneeThermocell Development, Ltd.
InventorStuart B. Smith
Life of this patent
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Abstract
A flame-retardant, rigid, thermosetting foam product is prepared by reacting, in the presence of a blowing agent and a catalyst, particularly an organic metal catalyst, a furfural alcohol polymer, a phenol-formaldehyde resin, a melamine and methylene diphenyl isocyanate, which reaction provides for a rigid foam characterized by low friability and good heat- and flame-resistant properties.
Claims13
A method of preparing a thermosetting foam product, which method comprises:
- reacting 100 parts of a phenol-formaldehyde resin having a mole ratio of phenol to formaldehyde of from about 1:1.2 to 1:2.0 with from about 10 to 90 parts of a furfural-alcohol polymer, and with from 50 to 250 parts of melamine, and with from 50 to 250 parts of methylene diphenyl isocyanate, the reaction carried out in the presence of a blowing agent, and a catalytic amount of an isocyanate trimerization catalyst, to provide a substantially closed-cell thermosetting foam characterized by low friability and high structural strength and with good flame and heat properties.
A method of preparing a thermosetting, rigid foam product, which method comprises reacting 100 parts of a phenol-formaldehyde resin of the benzylic ether type, having a mole ratio of phenol to formaldehyde of from about 1:1.2 to 1:2.0, with a furfural-alcohol polymer which is composed of a generally head-to-tail polymerization with the furfural alcohol in the polymer chain and having reactive hydroxyl groups in the polymer, the furfural-alcohol polymer present in an amount of from about 10 to 90 parts and with melamine in an amount of from about 50 to 250 parts, and with methylene diphenyl isocyanate in an amount of from about 50 to 250 parts in the presence of from about 0.5 to 15 parts of a blowing agent, 0.5 to 15 parts of an organotin catalyst, and from about 0.05 to 5.0 parts of a cell control surfactant, to provide on reaction a thermosetting, rigid, substantially closed-cell foam product of good structural strength and low friability and good flame-retardant and heat properties.
Dependencies are inferred from the claim text.