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Surface-sizing agent

A surface sizing agent and surface active technology, which is applied in the direction of water repellent addition, textile and papermaking, fiber raw material treatment, etc., can solve the problems of condensate production, insufficient water resistance, metal ion stability, and poor mechanical stability, etc. question

Inactive Publication Date: 2003-03-12
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the above-mentioned surface finishing agent emulsifies styrene and styrene derivatives in an ammonia solution of shellac, and though it can improve the water resistance and gloss of paper, it often produces aggregates and the like during emulsification polymerization. Manufacturing problems and insufficient water resistance
Moreover, the resulting surface finishing agent has extremely poor stability to metal ions and mechanical stability, so various problems arise in actual operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0072] According to the reference example 2 of Japanese Unexamined Publication No. 8-246391, the aqueous solution of the ammonium salt (S-1) of the polymer dispersant styrene-acrylic acid copolymer in the present invention, that is, the polymer dispersant solution (S-1) was synthesized as follows. -1 solution).

[0073] 100 parts of water and 75 parts of 95% isopropanol were added to a 1-liter four-necked flask equipped with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen gas introduction pipe, and heated while stirring until the temperature rose to 80°C. Therein, a monomer mixture liquid of 45 parts of styrene and 55 parts of acrylic acid, and a polymerization initiating solution of 5 parts of potassium persulfate dissolved in 120 parts of water were added dropwise for 3 hours, and then kept for 2 hours to complete the reaction. Thereafter, the isopropanol was evaporated, and after cooling, 46.4 parts of 28% ammonia solution (relative to 100 mol% of acrylic ac...

Synthetic example 2

[0075] In a 1-liter four-necked flask equipped with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen inlet pipe, add 586 parts of water, 80 parts of styrene, 39 parts of α-methylstyrene, 22 parts of methyl methacrylate, and 75 parts of acrylic acid, 3.3 parts of n-dodecyl mercaptan, 1 part of sodium dodecylbenzenesulfonate, and 33 parts of 30% ammonium persulfate aqueous solution, and heated to 80°C, and kept at 80°C for 2 hours so that The reaction is complete. Then, 121 parts of 30% caustic soda solutions (95 mol% with respect to methacrylic acid) were added, and it maintained at 80 degreeC for 30 minutes. Diluted with water, adjusted to make the copolymer concentration 25%, and obtained the aqueous solution of the sodium salt (S-2) of the water-soluble copolymer styrene-methacrylic acid copolymer, that is, the polymer dispersion solution (S-2 solution) .

Embodiment 1

[0077] In a 1-liter four-necked flask equipped with a stirrer, a thermometer, a reflux cooling pipe, and a nitrogen gas introduction pipe, 535 parts of water and 13.2 parts of shellac (N811 manufactured by Gifu SHELLAC Co., Ltd.) were added (100 parts by weight of the entire hydrophobic monomer) 8 parts by weight), ELEMINOL JS-2 (manufactured by Sanyo Chemicals) 4.2 parts (1 part by weight when the total hydrophobic monomer is 100 parts by weight), acrylamide 12.9 parts ( When 100 parts by weight, it is 8 parts by weight), 3.4 parts of 48% caustic, and then add 64.5 parts of styrene (when the whole hydrophobic monomer is 100 parts by weight, it is 40 parts by weight), n-butyl acrylate 96.7 parts (60 parts by weight when the total hydrophobic monomer is 100 parts by weight), and 0.8 parts of ammonium persulfate, the temperature was raised to 80° C. while mixing and stirring under a nitrogen stream. Keep at 80 DEG C for 2 hours to complete the emulsification polymerization react...

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PUM

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Abstract

A surface-sizing agent for papermaking which itself is excellent in mechanical stability and storage stability, and which is highly suitable for the sizing of acidic to neutral papers. When applied to papers for information, especially ink-jet printing papers, the sizing agent imparts excellent suitability for ink-jet printing. When the sizing agent is used to prepare a coating fluid, the coating fluid is significantly reduced in foaming. The sizing agent has excellent compatibility with other chemicals to be used in combination therewith. The surface-sizing agent is characterized by being obtained by polymerizing a nonionic hydrophilic monomer (b) with a hydrophobic monomer (d) in the presence of an alkali salt of shellac (a) and then mixing a polymeric dispersant (e) therewith.

Description

technical field [0001] The present invention relates to surface sizing agents, and more specifically, relates to mechanical stability, storage stability, sizing performance for acidic paper to neutral paper, suitability for information paper, low Surface sizing agent for papermaking with excellent foamability and compatibility with other concomitant drugs. Background technique [0002] As far as the current surface sizing agents for papermaking are concerned, there are known styrene-maleic acid copolymers, styrene-(meth)acrylic acid copolymers, α-olefin-maleic acid copolymers, Aqueous solutions of alkali metal salts such as substances. [0003] Although the surface sizing agent of styrene-maleic acid copolymer shows a good sizing effect for acidic papermaking that uses a lot of alum, it has a small amount of alum for neutral papermaking that does not use alum. The sizing performance of the neutral papermaking paper is significantly poor. [0004] In addition, since the si...

Claims

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Application Information

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IPC IPC(8): D21H17/21D21H21/16
CPCD21H21/16D21H17/21
Inventor 池田刚兼重千夏吉野文夫
Owner SEIKO PMC CORP
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