Copolymer

Patent metadata

Field	Value
Publication number	US-9562128-B2
Application number	US-201214350726-A
Country	US
Kind code	B2
Filing date	Oct 15, 2012
Priority date	Oct 20, 2011
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A novel copolymer having excellent pigment dispersion performance, and more particularly, a novel copolymer usable as a pigment dispersing agent that can attain high luminance and high contrast of a green picture element in a color filter. The novel copolymer contains: a block chain (A) including a repeating unit having a tertiary amino group; and a block chain (B) including a repeating unit represented by the following formula (I) (wherein R 1 represents a hydrogen atom or a C1-C3 alkyl group, R 2 and R 3 each independently represent a hydrogen atom or a C1-C6 alkyl group, Q represents an oxygen-containing saturated hetero ring group optionally having an alkyl group as a substituent or a C2-C20 alkenyl group, and n represents an integer of 0 to 6), and has an amine value of 80 mgKOH/g or more and 250 mgKOH/g or less.

First claim

The invention claimed is:

1. A copolymer comprising:
a block chain (A) comprising a repeating unit having a tertiary amino group; and
a block chain (B) comprising:
a repeating unit derived from methoxypolyethylene glycol (meth)acrylate or ethoxypolyethylene glycol (meth)acrylate; and
a repeating unit represented by formula (I):

wherein:
R 1 represents a hydrogen atom or a C1-C3 alkyl group,
R 2 and R 3 each independently represents a hydrogen atom or a C1-C6 alkyl group,
Q represents:
an oxetanyl group,
a tetrahydrofuranyl group,
a tetrahydropyranyl group,
a morpholinyl group, or
a thiomorpholinyl group,

wherein each group optionally has an alkyl group as a substituent; and
n represents an integer of 1 to 6,
wherein the copolymer has an amine value of 80 mgKOH/g or more and 250 mgKOH/g or less.

2. The copolymer according to claim 1 , wherein the repeating unit having a tertiary amino group is a repeating unit represented by formula (II):

wherein:
R 4 represents a hydrogen atom or a C1-C3 alkyl group,
R 5 and R 6 each independently represents a C1-C6 alkyl group or a C6-C10 aryl C1-C6 alkyl group, and
X represents a C1-C10 alkylene group or a C1-C10 alkylene-O—C1-C10 alkylene group.

3. The copolymer according to claim 1 , wherein the copolymer has a ratio (Mw/Mn) between a weight average molecular weight (Mw) and a number average molecular weight (Mn) of 1.01 to 2.00.

4. The copolymer according to claim 1 , wherein the copolymer has a weight average molecular weight (Mw) of 2,000 to 50,000.

Assignees

• Nippon Soda Co

Inventors

• Niitani Takeshi
• Okado Toshiaki
• Tando Izumi
• Naruse Hidenori
• Kajita Tooru

Classifications

• C08F297/026

  polymerising acrylic acid, methacrylic acid or derivatives thereof · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• C09B67/009

  polymeric dispersing agent · CPC title

• C09B67/00

  Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents {grinding or grinding assistants, coating of pigments or dyes}; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films · CPC title

• C08F299/04 Primary

  from polyesters · CPC title