JP2008272604A5

JP2008272604A5 -

Info

Publication number: JP2008272604A5
Application number: JP2007115782A
Authority: JP
Filing date: 2007-04-25
Publication date: 2010-01-07
Anticipated expiration: 2027-04-25

Claims

It is represented by the following general formula (6) or (7) having a unit (G) represented by the following general formula (1) having 2 or 3 aromatic carboxylic acids and a side chain having a number average molecular weight of 500 to 15000. A vinyl-based dispersant comprising a unit (B) and having a side chain ratio of 30 to 70 parts by weight based on the total of all units.
General formula (1):

[In general formula (1),
R ¹ is a hydrogen atom or a methyl group,
X ¹ is —C (═O) O—, —C (═O) NH—, —O—, —OC (═O) —, or —CH ₂ O—,
E ^1a is a repeating unit represented by —R ^1a —O—,
E ^1b is a repeating unit represented by —C (═O) —R ^1b —O—,
R ^1a is a linear or branched alkylene group having 2 to 8 carbon atoms,
R ^1b is a linear or branched alkylene group having 4 to 8 carbon atoms,
m1a is an integer of 0 to 10,
m1b is an integer of 0 to 5,
Y ¹ is a monovalent group represented by the following general formula (2) or general formula (3). ]
General formula (2):

[In general formula (2),
Two of A ^{1 to} A ³ are —C (═O) OH,
The other is a hydrogen atom, —C (═O) OH, or —C (═O) OR ^c, where R ^c is an alkyl group having 1 to 18 carbon atoms, or a vinyl-based copolymer. Combined residue Q),
k is 1 or 2. ]
General formula (3):

[In general formula (3),
Two of A ^{5 to} A ⁷ are —C (═O) OH,
The other is a hydrogen atom, —C (═O) OH, or —C (═O) OR ^c (where R ^c is an alkyl group having 1 to 18 carbon atoms, or vinyl Copolymer residue Q),
R ² is a direct bond, —CH ₂ —, —O—, —C (═O) —, —C (═O) OCH ₂ CH ₂ OC (═O) —, —C (═O) OCH (OC (═O) CH ₃ ) CH ₂ OC (═O) —, —SO ₂ —, —C (CF ₃ ) ₂ —, a group represented by the following formula (4), or represented by the following formula (5). Group. ]
Formula (4)

Formula (5)

General formula (6):

(In general formula (6),
R ³ is a hydrogen atom or a methyl group,
X ² is a direct bond or a divalent organic residue,
E ^2a is a repeating unit represented by —R ^2a —O— or —O—R ^2a —,
E ^2b is a repeating unit represented by —C (═O) —R ^2b —O— or —O—R ^2b —C (═O) —,
R ^2a is a linear or branched alkylene group having 1 to 4 carbon atoms,
R ^2b is a linear or branched alkylene group having 2 to 10 carbon atoms,
m2a is 0-20,
m2b is 0-20,
X ³ is a direct bond or —O—.
Y ² is a hydrogen atom or a linear or branched alkyl group having 1 to 20 carbon atoms. )
General formula (7)

[In general formula (7),
R ⁴ is a hydrogen atom, a methyl group, or —C (═O) —O—R ¹¹ ,
R ¹¹ is a linear or branched alkyl group having 1 to 18 carbon atoms,
X ⁴ is a direct bond or a divalent organic residue,
R ⁵ is a hydrogen atom or a methyl group,
R ⁶ is an aromatic group or —C (═O) —X ⁵ —R ⁷ ;
X ⁵ is —O— or —NH—.
R ⁷ is a hydrogen atom or a linear or branched alkyl group having 1 to 18 carbon atoms, and the alkyl group may have an aromatic group substituent;
m3 is 10-100,
Y ³ is a polymerization stopping group of the vinyl polymer. ]

The vinyl-type dispersing agent of Claim 1 shown by following General formula (8).
General formula (8)

[In general formula (8),
(L) is a main chain constituent unit represented by the following general formula (9),
General formula (9)

[In general formula (9),
R ⁸ is a hydrogen atom or a methyl group,
R ⁹ is an aromatic group or —C (═O) —X ⁶ —R ¹⁰ ;
X ⁶ is —O— or —NH—,
R ¹⁰ is a hydrogen atom or a linear or branched alkyl group having 1 to 18 carbon atoms, and the alkyl group may have an aromatic group substituent. ],
[The arrangement of the carboxyl group-containing unit (G), the side chain-containing unit (B), and the main chain constituent unit (L) is not limited to the order, and is represented by the general formula (8). In the vinyl polymer main chain, each unit (G), (B), and (L) is included in any order, and each unit (G), (B), and (L ) Can be included in random or block type,
When the unit (G) having the carboxyl group, the unit (B) having the side chain, and the main chain constituent unit (L) contained in the general formula (8) are present in plural Can be the same or different from each other,
p1, p2, and p3 represent the average number of each structural unit per molecule of the vinyl-based dispersant, p1 is 0.3 or more and 30 or less, p2 is 0.5 or more and 50 or less, and p3 is 6 More than 250. ]

The vinyl dispersant according to claim 2, wherein p1 is more than 3.0 and 20 or less.

The unit (G) represented by the above general formula (1) having 2 or 3 aromatic carboxylic acids and the above general formula (6) or (7) having a side chain having a number average molecular weight of 500 to 15000 A vinyl dispersant containing a unit (B) and having a side chain ratio of 30 to 70 parts by weight based on the total of all units, comprising at least an aromatic tricarboxylic acid anhydride or aromatic A process for producing a vinyl-based dispersant comprising the step [1] of forming an aromatic carboxyl group serving as an anchor portion by reacting an aromatic tetracarboxylic acid anhydride and a compound having an acid anhydride reactive group .

The method for producing a vinyl-based dispersant according to claim 4, comprising a step [2] of forming a unit having a side chain having a number average molecular weight of 500 to 15000.

The method for producing a vinyl-based dispersant according to claim 4 or 5, further comprising a step [3] of forming a main chain by vinyl polymerization.

A pigment dispersion comprising a pigment and the dispersant according to any one of claims 1 to 3.

The method further comprises at least one basic synergist selected from the group consisting of a pigment derivative having a basic group, an anthraquinone derivative having a basic group, an acridone derivative having a basic group, and a triazine derivative having a basic group. The pigment dispersion described.