Supercharge Your Innovation With Domain-Expert AI Agents!

Coating agent, adhesive and coated material

A technology for coating agents and coatings, applied in the direction of coatings, anti-sticking paper, paper coatings, etc., can solve the problems of reduced water resistance, coating, adhesiveness, and high heat of coatings, and achieve Excellent water resistance and alcohol resistance, excellent coating and adhesive effects

Active Publication Date: 2020-11-06
KURARAY CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current situation is that the use of alcohols with 2 to 3 carbon atoms, which has a higher boiling point and latent heat of vaporization than methanol, increases the heat and time required for the drying process, resulting in industrial problems such as increased production costs.
[0008] Even without using the above-mentioned drying technology, if it is the usual case, the methanol component can be removed by heating and drying at a high temperature for a long time, but the energy consumption is large, and the production efficiency is sacrificed in the industry
In addition, PVA containing a structural unit derived from a derivative of an ethylenically unsaturated dicarboxylic acid (such as a monoester, a diester, or an anhydride) is described in Non-Patent Document 1, and a structural unit derived from a monoester, a diester, or an anhydride is combined The hydroxyl moiety of PVA undergoes a cross-linking reaction at high temperature to form a water-insoluble component. When an aqueous solution is prepared and used as a coating agent, problems such as roller contamination and filter clogging may occur, or coating and adhesive properties may be affected. reduced, or reduced water resistance of the resulting coating
Therefore, it is substantially difficult for this PVA to simultaneously reduce the methanol content and suppress the formation of water-insoluble components.
In addition, due to this property, it is also difficult to apply the method of Patent Document 4, which requires high heat and long-term drying compared with usual

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coating agent, adhesive and coated material
  • Coating agent, adhesive and coated material
  • Coating agent, adhesive and coated material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0118] Next, the present invention will be described in more detail by giving examples, but the present invention is not limited to these examples at all, and those skilled in the art can make various modifications within the scope of the technical idea of ​​the present invention. In the following examples and comparative examples, "part" means "mass part" and "%" means "mass %" unless otherwise specified.

[0119] [Viscosity-average degree of polymerization of modified PVA (A)]

[0120]The viscosity-average degree of polymerization of the modified PVA (A) was measured in accordance with JIS K 6726:1994. Specifically, when the degree of saponification of the modified PVA (A) is less than 99.5 mol%, saponify until the degree of saponification reaches 99.5 mol% or more. For the obtained modified PVA (A), use water and measure at 30°C Intrinsic viscosity [η] (liter / g), the viscosity-average degree of polymerization (P) was obtained by the following formula.

[0121] P=([η]×10 ...

Synthetic example 1

[0139] A polymerization vessel (continuous polymerization device; hereinafter referred to as "polymerization tank") equipped with a reflux condenser, a raw material supply line, a thermometer, a nitrogen inlet, and a stirring blade was used, and a reflux condenser, a raw material supply line, and a reaction liquid discharge line were used. Device for thermometer, nitrogen gas inlet and stirring blades. Continuously supply vinyl acetate (VAM) 876L / hr, methanol (MeOH) 157L / hr, derivative (a) of ethylenically unsaturated dicarboxylic acid, maleic acid mono Methyl ester (MMM) in 20% methanol solution 12.9L / hr, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile) (AMV) in 2% methanol solution 13.6L / hr. The polymerization solution was continuously taken out from the polymerization tank so that the liquid level in the polymerization tank became constant. Adjustments were made so that the polymerization rate of vinyl acetate in the polymerization liquid taken out from the polymerizatio...

Embodiment 1

[0148] (Preparation of coating agent)

[0149] Kaolin (trade name: UW90, manufactured by Engelhald Corporation (currently BASF)) as a filler (C) was dispersed in water to a concentration of 40%, and stirred with a household mixer for 10 minutes to prepare a dispersion. As the ratio of the solid content, the aqueous solution containing 32 parts by mass of PVA-1, the kaolin as the filler (C) reached 60 parts by mass, and the polyamide epichlorohydrin resin (manufactured by Starlight PMC Co., Ltd.) as the crosslinking agent (B) "WS4020") was mixed so that 8 mass parts of said dispersion liquid, the aqueous solution of PVA-1, and a crosslinking agent were mixed, and the coating agent was prepared. The concentration of PVA-1 in the obtained coating agent was 5.8% by mass, and the methanol content in the coating agent was measured by the following method, and it was 0.05% by mass.

[0150] (Production of thermal recording materials)

[0151] Use a curtain coater to adjust the resu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides: a coating agent which is reduced in the methanol content; an adhesive which uses this coating agent and exhibits excellent coatability and adhesiveness; and a coated material which exhibits excellent water resistance and alcohol resistance. The present invention relates to a coating agent which contains a modified vinyl alcohol polymer (A) that has a content (X) ofa structural unit, which is derived from a derivative (a) of an ethylenically unsaturated dicarboxylic acid, of from 0.05% by mole to 10% by mole (inclusive), a saponification degree of from 80.0% bymole to 99.9% by mole (inclusive), a methanol content of less than 3.0% by mass as determined by head space gas chromatography, and a content of components that are insoluble in an aqueous solution having a concentration of 5% by mass at 90 DEG C of 0.1 ppm or more but less than 2,000 ppm.

Description

technical field [0001] The present invention relates to a coating agent, an adhesive, and a coated article containing a specific modified vinyl alcohol polymer. Background technique [0002] Vinyl alcohol-based polymers (hereinafter sometimes abbreviated as "PVA") are known as water-soluble synthetic polymers, and are used as raw materials for synthetic fiber vinylon, and are widely used in paper processing, fiber processing, and adhesive bonding. Agents, stabilizers for emulsion polymerization and suspension polymerization, binders for inorganic substances, films, etc. Among them, in paper processing applications, in sizing agents, paper strength enhancers, dispersants such as pigments or dyes, binders for ink fixers such as silica, and fillers for silicone, imparting gas barrier properties and oil resistance , light resistance, water resistance and other surface treatment agents, additives for curtain coaters, etc. are widely used. [0003] In particular, PVA modified wi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04C09J129/04D21H19/20
CPCD21H19/20C09J129/04C09D129/04D21H19/56D21H27/001C08F218/08C08F222/26C08K3/346C08K3/013C08K3/38C08L77/00C08K5/0025C09D133/02C09J133/02
Inventor 森川圭介谷田达也田冈悠太
Owner KURARAY CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com