Title:
PRODUCTION OF (METH)ACRYLIC ACID (SALT) POLYMER
Document Type and Number:
Japanese Patent JP2610089
Kind Code:
B2
Abstract:
PURPOSE: To obtain a polymer excellent in water solubility and storage stability by placing a water-contg. substance comprising a (meth)acrylic acid (salt) polymer having a specified degree of neutralization in a specified thickness on a sheet, thermally drying and cooling the substance, and separating it from the sheet.
CONSTITUTION: This (meth)acrylic acid (salt) polymer is produced by polymerizing a (meth)acrylic acid (salt) monomer in an aqueous soln., neutralizing the polymn. product so that up to 50mol% of acid groups in the product are neutralized, placing the product in a thickness of 0.5-10mm on a sheet, thermally drying the product at 80-230°C to remove water, cooling the resulting polymer to 60°C or lower, and separating the polymer from the sheet. The obtd. polymer is excellent in water solubility and storage stability, giving, even when dissolved in water after storage, a soln. which does not undergo decrease in thickening effect.
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Inventors:
Tokihiro Yokoi
Hiroshi Tsuboi
Hiroshi Tsuboi
Application Number:
JP4832593A
Publication Date:
May 14, 1997
Filing Date:
March 09, 1993
Export Citation:
Assignee:
Nippon Shokubai Co., Ltd.
International Classes:
C08F6/06; C08F20/06; C08F120/04; C08J5/18; (IPC1-7): C08F6/06; C08F20/06; C08J5/18
Domestic Patent References:
| JP5432589A | ||||
| JP6220221A |
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