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US 5,124,363 AGranted
Aqueous air foams of polyhydroxy polymer
AssigneeMinnesota Mining and Manufacturing Company
InventorRichard M. Stern
Life of this patent
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AssigneeMinnesota Mining and Manufacturing Company
InventorRichard M. Stern
Estimating the term…
A method of treating hazardous material or other substrate with an aqueous air foam, comprising the steps of (1) preparing an aqueous solution or dispersion comprising (a) water-soluble polyhydroxy polymer having a plurality of hydrogen-bondable 1,2- and/or 1,3-diol structures capable of complexation with the borate anion, B(OH).sub.4.sup.-, (b) polyvalent ionic complexing agent, such as borax, which crosslinks said polymer by hydrogen-bonding complexation, (c) foaming agent to impart persistence to the fluid air foam generated upon aeration of said solution or dispersion, (d) a pH modifier, such as sodium hydroxide or acetic acid, to impart an appropriate pH to the solution or dispersion necessary for time-controlled formation of gelled or viscous air foam from the fluid air foam, and (e) water as the major component of said aqueous solution or dispersion by weight; (2) aerating said aqueous solution or air-entrained, low density foam (or air foam) which is gelable or becomes viscous, generally at least 5 seconds after its formation; and (3) spraying, contacting or otherwise applying said fluid, aqueous air foam to exposed surface of said hazardous material or other substrate.
A gelable or viscosifiable aqueous solution or dispersion comprising (a) water-soluble polyhydroxy polymer having a plurality of hydrogen-bondable diol structures in the polymer chain in the form of 1,2-diol and/or 1,3-diol structures which are capable of complexation with borate anion, (b) water-soluble, polyprotic, inorganic acid salt, said salt comprising alkali metal borate, (c) foaming agent, (d) pH modifier, and (e) water as the major component by weight.
An aqueous solution or dispersion comprising (a) water-soluble polyhydroxy polymer having a plurality of hydrogen-bondable diol structures in the polymer chain in the form of 1,2-diol and/or 1,3-diol structures which are capable of complexation with borate anion, (b) water-soluble polyprotic inorganic acid salt which crosslinks said polymer by hydrogen-bonding complexation, said salt comprising alkali metal borate, (c) foaming agent to impart persistence to the fluid air foam generated upon aeration of said solution or dispersion, (d) pH modifier to impart an appropriate pH to said solution or dispersion necessary for time-controlled formation of gelled or viscous foam from said fluid foam, and (e) water as the major component by weight.
An aqueous, gelable, fluid air foam, the liquid phase of which comprises (a) water-soluble polyhydroxy polymer having a plurality of hydrogen-bondable diol structures in the polymer chain in the form of 1,2-diol and/or 1,3-diol structures which are capable of complexation with borate anion, (b) water-soluble polyprotic acid salt, said salt comprising alkali metal borate, (c) foaming agent, (d) pH modifier, and (e) water as the major component by weight.
A reversible, gelled, two-phase, aqueous air foam comprising a discontinuous air phase and a continuous aqueous, polymer phase comprising, as the major component of said foam by weight, water in which crosslinked polyhydroxy polymer is dispersed, the polymer chain of said polymer having 1,2-diol and/or 1,3-diol structures complexed with water-soluble polyprotic inorganic acid salt, said salt comprising alkali metal borate.
Dependencies are inferred from the claim text.