Super absorbent polymer materials
AssigneePlanet Smart Ltd
InventorGerald Perry Marin
Life of this patent
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Abstract
Provided herein are biodegradable, superabsorbent polymers (SAPs) and hydrogels, methods of preparing the same, and articles of manufacture comprising the superabsorbent polymer or hydrogels. The superabsorbent polymer and hydrogels comprise a poly(aspartic acid) polymer crosslinked with one or more crosslinking agents and can be used to prepare articles of manufacture, such as diapers, sanitary pads, incontinence products, bandages, wound dressings, surgical pads, pet pads, bed pads, meat pads, and agricultural products.
Claims20
A crosslinked polymer composition, comprising a poly(aspartic acid) (PASP) polymer, and two or more crosslinking agents, wherein the crosslinked polymer composition has:
- a water absorption capacity of at least 500 g/g;
- an absorption under load (AUL) of at least 16 g/g under a load of 0.7 psi;
- a centrifuge retention capacity (CRC) of at least 30 g/g;
- and
- a free swell capacity (FSC) of at least 40 g/g under a 0.9% saline solution,
- wherein the two or more crosslinking agents comprises at least one diamine crosslinker that is present in an amount of from 1 wt % to 5 wt % of a total crosslinked polymer composition, and
- wherein the crosslinked polymer composition comprises a crosslinked PASP polymer in a salt form.
A crosslinked polymer composition, comprising a poly(aspartic acid) (PASP) polymer and two or more crosslinking agents, wherein the crosslinked polymer composition has:
- a water absorption capacity of at least 500 g/g;
- and
- a whiteness index of L* in a range of from 97 to 100, a* in a range of from −1.4 to −1.2 and b* in a range of from 4.3 to 4.6, and wherein
- the two or more crosslinking agents comprise at least one diamine crosslinker as an internal crosslinker.
An article of manufacture comprising a crosslinked polymer composition, comprising a poly(aspartic acid) (PASP) polymer and two or more crosslinking agents, wherein:
- the crosslinked polymer composition has a water absorption capacity of at least 500 g/g;
- a whiteness index of L* in a range of from 97 to 100, a* in a range of from −1.4 to −1.2 and b* in a range of from 4.3 to 4.6;
- and
- the two or more crosslinking agents comprises at least one diamine crosslinker as an internal crosslinker, wherein the article of manufacture is selected from the group consisting of:
- (a) a biomedical product;
- or
- (b) a hygiene product.
An article of manufacture comprising a crosslinked polymer composition comprising poly(aspartic acid) (PASP) polymer and two or more crosslinking agents, wherein the crosslinked polymer composition has a water absorption capacity of at least 500 g/g;
- an absorption under load (AUL) of at least 16 g/g under a load of 0.7 psi;
- a centrifuge retention capacity (CRC) of at least 30 g/g;
- and a free swell capacity (FSC) of at least 40 g/g under a 0.9% saline solution, wherein the two or more crosslinking agents comprises at least one diamine crosslinker that is present in an amount of at least 2.5 wt %, and wherein the article of manufacture is selected from the group consisting of:
- (a) an agricultural product;
- (b) a biomedical product;
- (c) a mining and/or mineral processing product;
- (d) a hygiene product;
- or
- a packaging product.
Dependencies are inferred from the claim text.