Aqueous emulsion and adhesive in which same is used

一种水性乳液、乳液聚合的技术，应用在胶粘剂、粘合剂类型、酯共聚物粘合剂等方向，能够解决覆膜耐水性降低、乳液机械稳定性降低等问题，达到覆膜耐水性优异、初始粘接性优异、粘接耐久性优异的效果

Active Publication Date: 2017-08-29
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, it is known that because PVA is water-soluble, there are the following disadvantages: the water resistance of the film formed by the obtained emulsion is reduced, and in addition, the mechanical stability of the obtained emulsion is reduced, etc. These properties are obviously dependent on emulsion polymerization. PVA used in
[0007] However, the above-mentioned conventional emulsions and adhesives cannot satisfy all of these requirements at the same time, and emulsions and adhesives satisfying the above-mentioned requirements are required.

Method used

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  • Aqueous emulsion and adhesive in which same is used
  • Aqueous emulsion and adhesive in which same is used
  • Aqueous emulsion and adhesive in which same is used

Examples

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preparation example Construction

[0048] The method for preparing the aqueous emulsion of the present invention is not particularly limited, and examples thereof include the following method: in the presence of 0.5 to 40 parts by mass of the specific PVA (dispersant) described later with respect to 100 parts by mass of the above-mentioned ethylenically unsaturated monomer A method of performing emulsion polymerization by appropriately selecting a polymerization initiator. By such emulsion polymerization, an aqueous emulsion in which a part of the PVA as an emulsion polymerization dispersant is adsorbed on the surface of a polymer containing an ethylenically unsaturated monomer unit as a dispersoid can be obtained. Part of the PVA used as a dispersant in emulsion polymerization functions as a dispersant as described above, and the remaining PVA not adsorbed to the dispersoid exists in the aqueous emulsion as free PVA. It is considered that the PVA freely present in the aqueous emulsion (free PVA) significantly ...

Embodiment 1

[0168] (Manufacture of water-based emulsion)

[0169] 258.1 g of ion-exchanged water and 18.9 g of PVA-1 were put into a 1 L glass polymerization vessel equipped with a reflux condenser, dropping funnel, thermometer, and nitrogen blowing port, and were completely dissolved at 95° C. to obtain a PVA aqueous solution. Next, after cooling and replacing the PVA aqueous solution with nitrogen, 25.2 g of vinyl acetate was added with stirring at 200 rpm, and after the temperature was raised to 60° C., 6.9 g of 5% hydrogen peroxide and 3.0 g of 20% tartaric acid were added for oxidation. Reduce the initiator to initiate emulsion polymerization. After 15 minutes from the start of the polymerization, 226.4 g of vinyl acetate was continuously added over 3 hours, and then 0.9 g of 5% hydrogen peroxide and 0.3 g of 20% tartaric acid were added to terminate the polymerization and obtain a solid content concentration of 49.5 mass % polyvinyl acetate emulsion. In this emulsion, the content ...

Embodiment 2~5

[0172] [Examples 2 to 5 and Comparative Examples 1 to 4]

[0173] Except changing feed vinyl acetate, PVA, ion-exchanged water and the kind of addition of vinyl acetate, PVA and initiator when changing emulsion polymerization as shown in Table 1, by the method identical with embodiment 1 Manufacture various water-based emulsions. Table 2 shows the evaluation results of the obtained aqueous emulsions.

[0174] Furthermore, except that various aqueous emulsions produced by the method in Table 1 were used instead of the aqueous emulsion of Example 1, the adhesives of Examples 2 to 5 and Comparative Examples 2 to 4 were produced by the same method as in Example 1. agent. Table 2 shows the physical property evaluation results of the obtained adhesives.

[0175] [Table 1]

[0176]

[0177] [Table 2]

[0178]

[0179] As shown in Table 2, it can be seen that the aqueous emulsions of Examples 1 to 5 are excellent in mechanical stability and coating water resistance. In addit...

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Abstract

The invention pertains to an aqueous emulsion containing a polymer as a dispersoid and PVA as a dispersant, the polymer containing ethylenically unsaturated monomer units; wherein, the free PVA content of the aqueous emulsion is 0.2-20 parts by mass per 100 parts by mass of the polymer containing ethylenically unsaturated monomer units, the degree of saponification of the free PVA is 80.0-99.5% molar, the viscosity-average degree of polymerization is 200-5000, and the free PVA has a symmetry factor (W0.05 h / 2f), based on JIS K0124 (2011) that satisfies formula (1), said factor measured by reversed-phase distribution gradient high-speed liquid chromatography using a water-acetone eluent. 0.85<=W0.05h / 2f<=1.30 (1) (the meanings of the symbols are omitted.)

Description

technical field [0001] The present invention relates to an aqueous emulsion containing a specific amount of free polyvinyl alcohol shown in the chromatogram of high performance liquid chromatography (hereinafter sometimes abbreviated as "HPLC"), and an adhesive containing the aqueous emulsion. Get specific symmetry coefficients. Background technique [0002] Water-based polymer emulsions have been widely used in various applications such as adhesives for wood, paper, plastics, etc., paints, fiber processing agents, and paper processing agents. In particular, polyvinyl alcohol (hereinafter sometimes abbreviated as "PVA") is known as a protective colloid for emulsion polymerization of vinyl ester-based monomers represented by vinyl acetate, and it is used as a dispersant for emulsion polymerization and The vinyl ester-based aqueous emulsion obtained by emulsion polymerization is widely used in various adhesives for paper, woodworking, and plastics, various adhesives for impre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/20C08F2/24C08L29/04C08L101/02C09J11/08C09J109/00C09J125/04C09J131/02C09J133/04C09J157/00C09J175/04
CPCC09J175/04C08G18/6212C08F261/04C08G18/2835C09J151/003C08G2170/80C08F8/12C08F216/06C08F218/08C09D131/04C08L29/04C08F2/20C08F2/24C09J11/08C09J109/00C09J125/04C09J131/02C09J133/04C09J157/00C08L101/02
Inventor 真木秀树仲前昌人
Owner KURARAY CO LTD
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