Reduced-friability, highly cross-linked, flame-resistant, polyurethane foams
AssigneeGeneral Latex and Chemical Corporation
InventorsHenry S. Hopkins, Jr., Donald L. Vargo
Life of this patent
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Abstract
Highly flame-resistant polyurethane foams of improved friability and reduced brittleness without a corresponding substantial increase in flame-spread or smoke-generation characteristics are prepared by incorporating into a foamable polyurethane composition an amount of a liquid organic carbonate, such as ethylene or propylene carbonate.
Claims15
An improved, rigid, cross-linked, polyurethane foam characterized by ASTM E-84 flame-spread values of 25 or less and low smoke-generation values of 400 or less, and having improved friability properties, which foam comprises the reaction product of a polyisocyanate and a halogenated polyether polyol having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 1 to 10% by weight of a liquid C.sub.2 -C.sub.6 alkylene carbonate having a boiling point of greater than about 230.degree. C.
An improved, rigid, cross-linked, polyurethane foam characterized by ASTM E-84 flame-spread values of about 20 to 25 or less and low smoke-generation values of a 4-inch foam of between 200 and 400 or less, and having improved friability properties, which foam comprises the reaction product of a polyisocyanate and a polyol comprising a chloro polyether polyol, and having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 2 to 8% by weight of a propylene carbonate.
A method of preparing an improved polyurethane foam which is characterized by ASTM E-84 flame-spread values of 25 or less and low smoke-generation values of 400 or less, and having improved friability properties, which method comprises reacting a polyisocyanate and a halogenated polyether polyol having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 1 to 10% by weight of ethylene or propylene carbonate.
Dependencies are inferred from the claim text.