Claims
- 1. A process of manufacturing a precursor of an absorbing agent, comprising the step of:
- performing an aqueous solution polymerization of a hydrophilic unsaturated monomer having at least 50 mole percent neutralized acrylic acid as a main component in a presence of a dispersant, using a crosslinking agent composed of a main component and a high-boiling point component in an amount in a range of not less than 0.05 mole percent and not more than 0.5 mole percent with respect to a total amount of the hydrophilic unsaturated monomer,
- wherein a ratio in weight of the main component of said crosslinking agent to a high-boiling point compound is in a range of 75/25 to 99/1,
- a main component of said crosslinking agent is composed of an ester compound including a polyhydroxy alcohol having not more than six carbon atoms and at least three hydroxy groups, and an unsaturated carboxylic acid,
- a ratio in molecular weight of the main component of said crosslinking agent to a standard compound is not less than 0.7 and less than 1.3 based on a molecular weight of the standard compound wherein all hydroxy groups of the polyvalent alcohol are ester-linked to the unsaturated carboxylic acid, and
- said high-boiling point component includes at least two alcohol structures in a molecule.
- 2. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- a ratio in weight of the main component of said crosslinking agent to a high-boiling point compound is in a range of 80/20 to 90/10.
- 3. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- said acrylic acid is 65 mole percent to 80 mole percent neutralized.
- 4. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- said crosslinking agent is used in an amount in a range of 0.07 mole percent and 0.2 mole percent with respect to said hydrophilic unsaturated monomer.
- 5. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- said dispersant is used in an amount in a range of 1 percent by weight and 100 percents by weight with respect to said crosslinking agent.
- 6. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- said step of performing an aqueous solution polymerization includes the steps of mixing said crosslinking agent and said dispersant, and mixing a resulting mixed product into said hydrophilic unsaturated monomer.
- 7. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- said step of performing an aqueous solution polymerization includes the steps of mixing said crosslinking agent, said dispersant and the acrylic acid, and mixing a resulting mixed product into said hydrophilic unsaturated monomer.
- 8. The process of manufacturing a precursor of the absorbing agent as set forth in claim 1, wherein:
- said polyhydroxy alcohol having not more than six carbon atoms and at least three hydroxy groups is trimethylolpropane, and
- said unsaturated carboxylic acid is acrylic acid.
Priority Claims (4)
Number |
Date |
Country |
Kind |
6-130385 |
Jun 1994 |
JPX |
|
6-132126 |
Jun 1994 |
JPX |
|
7-145010 |
Jun 1995 |
JPX |
|
7-145012 |
Jun 1995 |
JPX |
|
Parent Case Info
This application is a divisional application of Ser. No. 08/571,960, filed Dec. 28, 1995, now U.S. Pat. No. 5,760,080.
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Divisions (1)
|
Number |
Date |
Country |
Parent |
571960 |
Dec 1995 |
|