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Method for producing cationic surface sizing agent, and sizing agent obtained by method

A surface sizing agent, cationic technology, applied in the field of paper and cardboard, can solve the problem of poor sizing effect, and achieve the effect of excellent sizing and excellent dispersion stability

Inactive Publication Date: 2013-12-18
HARIMA CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with cationic surface sizing agents obtained by solution polymerization, the effect of imparting sizing properties is inferior

Method used

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  • Method for producing cationic surface sizing agent, and sizing agent obtained by method
  • Method for producing cationic surface sizing agent, and sizing agent obtained by method
  • Method for producing cationic surface sizing agent, and sizing agent obtained by method

Examples

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Comparison scheme
Effect test

Embodiment

[0086] Hereinafter, although an Example and a comparative example are given and this invention is concretely demonstrated, this invention is not limited to these Examples.

[0087] The abbreviations described in Examples, Comparative Examples and Tables represent the following compounds.

[0088] DM: Dimethylaminoethyl methacrylate

[0089] DMAPAA: Dimethylaminopropylacrylamide

[0090] St: Styrene

[0091] 2EHA: 2-Ethylhexyl Acrylate

[0092] 2EHMA: 2-ethylhexyl methacrylate

[0093] MMA: methyl methacrylate

[0094] LMA: lauryl methacrylate

[0095] nBA: n-butyl acrylate

[0096] nBMA: n-butyl methacrylate

[0097] iBA: Isobutyl Acrylate

[0098] iBMA: Isobutyl methacrylate

[0099] tBMA: tert-butyl methacrylate

[0100] CHMA: Cyclohexyl methacrylate

[0101] 2HEA: 2-Hydroxyethyl Acrylate

[0102]

Synthetic example A1

[0104] 20 parts by weight of dimethylaminoethyl methacrylate (DM), 20 parts by weight of 2-ethylhexyl acrylate (2EHA), styrene (St) of 60 parts by weight, 0.7 parts by weight of 32 parts by weight of n-dodecylmercaptan as a chain transfer agent, and 32 parts by weight of toluene as a solvent, and stirred. Then, it heated to about 105 degreeC, 1 weight part of tert-butylperoxyisopropyl monocarbonate was added as an initiator, and it was made to react at about 110 degreeC for 3 hours. Then, 8.5 parts by weight of 90% by weight acetic acid and 300 parts by weight of water were charged into the four-necked flask in order to neutralize the tertiary amino group portion of the obtained copolymer and a trace amount of DM remaining. Then, after distilling off toluene by heating, it diluted with water so that the solid content concentration might become 25 weight%, and the copolymer (A1) was obtained.

Synthetic example A2

[0106] In the four-necked flask, drop into 30 parts by weight of dimethylaminoethyl methacrylate (DM), 30 parts by weight of n-butyl methacrylate (nBMA), 40 parts by weight of styrene (St), 0.5 parts by weight tert-dodecylmercaptan as a chain transfer agent, and 32 parts by weight of isopropanol as a solvent, and stirred. Thereafter, it was heated to about 85°C, 1 part by weight of 2,2'-azobisisobutyronitrile was added as an initiator, and the mixture was reacted at about 90°C for 3 hours. Then, 12.7 parts by weight of 90% by weight acetic acid and 300 parts by weight of water were charged into the four-necked flask in order to neutralize the tertiary amino group portion of the obtained copolymer and a trace amount of DM remaining. Then, after distilling off isopropanol by heating, it diluted with water so that the solid content concentration might become 25 weight%, and obtained the copolymer (A2).

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Abstract

The present invention relates to a method for producing a cationic surface sizing agent. The method contains a first step for obtaining a copolymer (A) by solution-polymerizing of a monomer mixture that contains specific proportions of a monomer (a) containing a tertiary amino group, a specific (meth) acrylic acid ester (b), and a styrene (c), while in the presence of a chain-transfer agent; a second step for obtaining a copolymer (B) by polymerizing the copolymer (A) and a hydrophobic monomer (d) in a manner such that the copolymer (A) constitutes a specific proportion, while in the presence of a surfactant, and in an oxidation-reduction system that contains a water-soluble, free-radical initiator and a heavy metal salt; and a third step for obtaining quaternary ammonium salt of the copolymer (B) by quaternizing a tertiary amino group in the copolymer (B).

Description

technical field [0001] The present invention relates to a process for the manufacture of cationic surface sizing agents, the sizing agents obtained by this method, paper and board coated with the sizing agents. Background technique [0002] Conventional cationic surface sizing agents generally contain styrenes and tertiary amino group-containing monomers (ie, cationic monomers) as main components. It is an aqueous solution of a copolymer having a tertiary amino group obtained by polymerizing the monomer component, or a copolymer having a quaternary ammonium salt group obtained by quaternizing the tertiary amino group (Patent Documents 1 and 2). These copolymers can be obtained by the following methods: [0003] (i) Solution polymerization using an oil-soluble polymerization catalyst is performed in an organic solvent or a mixed solvent of an organic solvent and water. [0004] (ii) Emulsion polymerization using a water-soluble polymerization catalyst is performed in an aqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16C08F8/32D21H19/20
CPCD21H17/37D21H17/455D21H19/20D21H21/16D21H23/56Y10T428/31906
Inventor 袖山卓司林洋子稻冈和茂
Owner HARIMA CHEM INC
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