US 9,428,602 B2Granted

(Meth)acrylic acid copolymer and method for producing same

AssigneeNippon Shokubai Co., Ltd.

InventorsDaisuke Michitaka, Atsuro Yoneda, Kenji Kuwada

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Abstract

Provided is a (meth)acrylic acid-based copolymer containing, as structural units, a structural unit derived from a sulfonic acid (salt) group-containing monomer and a structural unit derived from (meth)acrylic acid (salt), the copolymer being capable of expressing an excellent effect on the dispersion of hydrophobic particles. Also provided is a method of producing such (meth)acrylic acid-based copolymer. A (meth)acrylic acid-based copolymer of the present invention contains: 1 mass % to 20 mass % of a structural unit (a) derived from an ether bond-containing hydrophobic monomer (A) represented by a specific structure; 1 mass % to 50 mass % of a structural unit (b) derived from a sulfonic acid (salt) group-containing monomer (B) represented by a specific structure; and 30 mass % to 98 mass % of a structural unit (c) derived from (meth)acrylic acid (salt) (C).

Claims10

Dependent claims

A (meth)acrylic acid-based copolymer, comprising:

1 mass % to 20 mass % of a structural unit (a) derived from an ether bond-containing hydrophobic monomer (A) represented by the general formula (1);
1 mass % to 50 mass % of a structural unit (b) derived from a sulfonic acid (salt) group-containing monomer (B) represented by the general formula (6);
and
30 mass % to 98 mass % of a structural unit (c) derived from (meth)acrylic acid (salt) (C):
in the general formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents an alkylene group having 1 to 10 carbon atoms, R3 represents an alkylene group having 1 to 10 carbon atoms, R4 represents H or a hydroxyl group, R5 represents an —OR6 group or R6, and R6 represents an alkyl group having 1 to 20 carbon atoms;
in the general formula (6), R7 represents a hydrogen atom or a methyl group, X represents —NH— or —O—, R8 represents an alkylene group having 1 to 10 carbon atoms, and M represents a hydrogen atom, a metal atom, an ammonium group, which constitutes an ammonium salt, i.e., SO3NH4, or an organic amino group, which constitutes an organic amine salt.

3 more elements

A method of producing a (meth)acrylic acid-based copolymer,

the method comprising polymerizing monomers including an ether bond-containing hydrophobic monomer (A) represented by the general formula (1), a sulfonic acid (salt) group-containing monomer (B) represented by the general formula (6), and (meth)acrylic acid (salt) (C) to produce a (meth)acrylic acid-based copolymer,
the monomer (A), the monomer (B), and the (meth)acrylic acid (salt) (C) being used at a ratio of 1 mass % to 20 mass %/1 mass % to 50 mass %/30 mass % to 98 mass %:
in the general formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents an alkylene group having 1 to 10 carbon atoms, R3 represents an alkylene group having 1 to 10 carbon atoms, R4 represents H or a hydroxyl group, R5 represents an —OR6 group or R6, and R6 represents an alkyl group having 1 to 20 carbon atoms;
in the general formula (6), R7 represents a hydrogen atom or a methyl group, X represents —NH— or —O—, R8 represents an alkylene group having 1 to 10 carbon atoms, and M represents a hydrogen atom, a metal atom, an ammonium group, which constitutes an ammonium salt, i.e., SO3NH4, or an organic amino group, which constitutes an organic amine salt.

1 more element

Dependencies are inferred from the claim text.