Superabsorbent polymer, method of making the same, and foodstuff packaging material including the same
AssigneeFormosa Plastics Corporation
InventorsZhong-Yi CHEN, Tai-Hong LAI
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Abstract
The present invention is related to superabsorbent polymer, a method of making the same, and a foodstuff packaging material including the same. The superabsorbent polymer includes a saturated organic acid and maintains excellent absorptive capacity and retention capability. Since the superabsorbent polymer has a high level of polymerization and stability after a polymerization of the aforementioned making method, the superabsorbent polymer has an antibacterial property and a low amount of extractives with low molecular weights. Hence, the superabsorbent polymer can be used as foodstuff packaging material.
Claims15
A superabsorbent polymer, comprising:
- a water solution containing carboxyl group monomers, wherein a neutralization ratio of the water solution containing the carboxyl group monomers is bigger than or equal to 45 mole percent, and pH of the water solution containing the carboxyl group monomers is smaller than 7.0;
- a saturated organic acid, having any one of a hydroxyl group and a halogen atom as well as at least two carboxylic acid group;
- a crosslinking agent;
- and
- a polymerization initiator, including a thermal decomposition initiator and/or a redox initiator.
A method of making a superabsorbent polymer, comprising:
- performing a neutralizing step on a water solution containing carboxyl group monomers with a basic compound, so that a neutralization ratio of the water solution containing the carboxyl group monomers is bigger than or equal to 45 mole percent, wherein pH of the water solution containing the carboxyl group monomers is smaller than 7.0;
- and
- mixing the water solution containing the carboxyl group monomers, a saturated organic acid, a crosslinking agent, and a polymerization initiator, and performing a free radical polymerization, so as to obtain the superabsorbent polymer.
Dependencies are inferred from the claim text.