PREPARATION OF HIGHLY WATER-ABSORBENT POLYMER

Japanese Patent JPH0436304

A

PURPOSE:To prepare the title polymer having excellent water absorption properties, a large mean particle diameter, and good flowability and transportability as a product by allowing (meth)acryilic acid or an alkali salt thereof to undergo reversed phase suspension polymn. in a hydrocarbon solvent in the presence of a specific phosphoric ester surfactant. CONSTITUTION:In a process wherein a monomer selected from the group consisting of (meth)acrylic acid and alkali metal salts thereof is allowed to undergo reversed phase suspension polymn. in a hydrocarbon solvent, in the presence of a crosslinker [e.g. N,N'-methylenebis(meth)acrylamide], using a radical initiator [e.g. ammonium persulfate, or an azo initiator such as azobis-(2- amidinopropane)-hydrochloride], a phosphoric ester surfactant of formula I (wherein R is 8-30C alkyl or alkylphenyl; R' is OH or a group of formula II; and (n) is 1-5) is used. The polymer product gives a highly water-absorbent polymer which, excellent in safety and having excellent water absorption properties, a large mean particle diameter, and good flowability and transportability as a product, is suitably used in many applications as a water absorbent material.

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YOSHINAGA KENJI
YADA SHUHEI

JP14247590A

February 06, 1992

May 31, 1990

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MITSUBISHI PETROCHEMICAL CO

C08F2/32; C08F20/06; C08F120/04; (IPC1-7): C08F2/32; C08F20/06

Takaya Yamamoto

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