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US 5,688,336 AGranted
Method for removal of water soluble polymers
OwnerJames B. Millard, Jr.inventor
Life of this patent
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Abstract
A solvent that will remove all types of commercially available water soluble polymers by breaking the covalent bonds within the polymer molecules such that these polymers can then be removed from all surfaces and equipment completely and safely by washing away with water. The solvent consists of (in a 21/2 gallon concentrated solution) 4% of ammonium chloride, 29% of ammonium hydroxide, and 67% water.
Claims7
A method of removing a water soluble polymer or residue thereof from a surface bearing a layer of said polymer or residue, said method comprising the steps of:
- (a) applying a solvent to said surface, said solvent consisting of an aqueous solution of 1.0 to 29 wt. %, inclusive, ammonium hydroxide, 0.1 to 4.9 wt. %, inclusive and the balance is water;
- ammonium chloride;
- (b) agitating said solvent with respect to said surface for a time sufficient to break said layer to facilitate removal thereof;
- and
- (c) rinsing said surface to remove said polymer or residue.
2 more elements
Dependencies are inferred from the claim text.