DEGRADABLE SUPERABSORBENT POLYMERS
First Claim
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1. A particle comprising a polymer composition, the polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the particle comprising convoluted surface morphology features.
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Abstract
The present disclosure relates to degradable superabsorbent materials based on acetals of glyoxylic acid and derivatives thereof with polyvinyl alcohol, and methods of making the polymers. The polymers are used to make superabsorbent particles, coatings, sheets, and fibers. Formulations and articles including the superabsorbent polymers, particles, coatings, sheets, and fibers are also disclosed.
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Citations
57 Claims
- 1. A particle comprising a polymer composition, the polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the particle comprising convoluted surface morphology features.
- 14. A coating comprising a polymer composition, the polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the coating comprising convoluted surface morphology features.
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24. A method of making a polymer composition, the polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the method comprising
a. combining about 5 wt % to 25 wt % polyvinyl alcohol in water with one or more glyoxylate derivatives to form a reaction mixture; -
b. evaporating at least a portion of the water from the reaction mixture; c. contacting the reaction mixture with a base to form the polymer composition; d. washing the polymer composition with a water miscible solvent or a solvent mixture, the solvent mixture comprising a water miscible solvent; and e. removing at least a portion of the water miscible solvent or the mixture. - View Dependent Claims (25, 26, 27, 28, 29)
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- 30. A method of degelling a hydrogel, the hydrogel comprising a neutralized poly(vinyl glyoxylic acid) and an aqueous liquid, the method comprising contacting the hydrogel with a weak organic acid in an amount sufficient to cause degelling of at least a portion of the contacted hydrogel.
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36. A particle comprising a polymer composition, the polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the particle comprising convoluted surface morphology features, the particle made by the method comprising:
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a. forming a hydrogel comprising the polymer composition and water; b. washing the hydrogel with a water miscible solvent or a solvent mixture, the solvent mixture comprising a water miscible solvent; and c. evaporating at least a portion of the water miscible solvent or the mixture. - View Dependent Claims (37)
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38. A coating comprising a polymer composition, the polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the coating comprising convoluted surface morphology features, the coating made by the method comprising:
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a. coating a reaction mixture onto a substrate, the reaction mixture comprising a mixture of about 5 wt % to 25 wt % polyvinyl alcohol in water and one or more glyoxylate derivatives; b. evaporating at least a portion of the water; c. contacting the coated reaction mixture with a base to form a polymer composition; d. washing the polymer composition with a water miscible solvent or a solvent mixture, the solvent mixture comprising a water miscible solvent; and e. evaporating at least a portion of the water miscible solvent or the mixture. - View Dependent Claims (39)
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- 40. A polymer composition comprising the reaction product of a glyoxylate derivative and a polyvinyl alcohol, wherein the polymer composition is capable of forming a hydrogel with an aqueous liquid, the dry polymer composition having an absorption capacity of about 16 to 50 g of 0.9 wt % NaCl solution per gram of the dry polymer composition and is capable of an initial rate of absorption of about 1 to 25 g of 0.9 wt % NaCl solution per gram of dry polymer composition per minute.
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55. A polymer composition comprising a neutralized poly(vinyl glyoxylic acid), the polymer composition made by the method comprising
a. combining about 5 wt % to 25 wt % polyvinyl alcohol in water with a mixture of glyoxylic acid and a glyoxylate salt to form a reaction mixture; -
b. evaporating at least a portion of the water from the reaction mixture; and c. contacting the reaction mixture with a base.
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57. An article comprising the formulation of 53, wherein the article is a diaper for an infant, an adult protective undergarment or incontinence undergarment, a feminine sanitary napkin, an underground power or communications cable, a horticultural water retention agent, control agent for aqueous fluid spill or effluent, a carrier for controlled release of insecticides, herbicides, fragrances, or drugs, a drilling fluid additive, a fire-retardant gel, a mortuary pad, a surgical pad, a wound dressing, a medical waste solidification article, an absorbent pad for food, a food packaging material, a cosmetic or personal care article, a sealing composite, a filter, a fuel monitor system for aviation and motor vehicles, a drown-free water source for caged insects, masking tape designed for use with latex paint, a hot/cold therapy pack, a motionless waterbed;
- a grow-in-water toy, or artificial snow for motion picture and stage production, or a combination of two or more thereof.
Specification