Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1990-09-18
1992-11-10
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523179, 524 47, 524 49, 524 58, 524503, C08K 900
Patent
active
051623943
ABSTRACT:
A fire-retardant composition for rendering a combustible hydrophilic substrate resistant to combustion and flaming is disclosed. Also disclosed are processes employing said composition for rendering a hydrophilic substrate resistant to combustion, as well as structural material made fire-resistant by such a process. The composition is a thermoset formed by combining two resins, which can be either made and stored separately for long periods until use or stored as a partially polymerized liquid mixture. The resins are water soluble and heat-curable to form the thermoset. The first resin comprises polyols derived preferably from a carbohydrate such as maltodextrin having substituent groups occupying a portion of the available hydroxyls derived from monoammonium phosphate, urea, phosphoric acid, and glyoxal. The second resin can be a methylol-melamine-formaldehyde, methylol-urea-formaldehyde, or methylol-phenol-formaldehyde formulation. When cured on a hydrophilic substrate, the fire-retardant composition becomes crosslinked and covalently bonded to molecules of the substrate. Also, P- and N-containing consituents critical for fire retardancy are covalently bound in the thermoset, rendering these constituents non-leachable. As a result, fire-retardancy is maintained throughout the useful life of the substrate, even when exposed to the weather.
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Amundson Fred J.
Trocino Frank S.
501 Chemco Inc.
Morgan Kriellion S.
Ranguru U. K.
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