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Method for preparing environmentally friendly paper coating agent by using water dispersible resin of ethylene-(METH)acrylic acid polymer, and use thereof

a technology of ethylene-methacrylic acid and paper coating agent, which is applied in the direction of synthetic resin layered products, rigid containers, packaging, etc., can solve the problems of difficult recycling, air pollution, and incineration of most conventional products, and achieves excellent dispersibility, reduced residue amount, and high uniformity of dispersed particles

Inactive Publication Date: 2016-05-26
RHEE BYEONG SEOK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for making a low-viscosity aqueous dispersion with excellent dispersability, high uniformity of dispersed particles, and decreased residue after filtering. This method uses volatile amines when forming a coating film, which reduces bad smells and improves the environmentally-friendliness of the product. Additionally, the invention provides an aqueous dispersion that can be used to manufacture a paper cup with excellent water resistance, oil resistance, and thermally adhesive property, by coating paper with the improved aqueous dispersion containing various additives such as a matting agent, a slip agent, and an anti-foaming agent.

Problems solved by technology

However, as the environmental problems have been worsened recently, it is urgently necessary to develop an environmentally friendly alternative wrapping wrapper.
During a melting process of the polyethylene chips, a volatile organic solvent suspected as a carcinogen is generated, and this solvent causes air pollution.
Further, it is difficult to be recycled and even when it is buried, it is not naturally dissolved, and therefore, most of the conventional products have been incinerated due to high disposal cost.
Furthermore, the conventional products are highly likely to release environmental hormones while being used / disposed, and, thus, have been questioned in terms of food hygiene and safety.
Therefore, the conventional products have limits in view of destruction of the environment and recycling of resources.
Particularly, a dispersion obtained by dispersing the copolymer in water with alkali metal hydroxide is easy to be produced, but the thus obtained film has a low water resistance, and an aqueous dispersion obtained by using ammonia is slightly difficult to be produced, but the thus obtained film has a high water resistance.
If an amount of ammonia (a degree of neutralization) is set to be greater by 100 mol % or more than a molar amount of acrylic acid or (meth)acrylic acid included in a copolymerized resin, dispersion may occur, but the thus obtained dispersion has a high viscosity or a residue is increased in amount after filtering, and a bad smell of ammonia becomes strong.
Therefore, there is a problem in view of improvement in usage environment of an aqueous dispersion.
Neutralization of acrylic acid or (meth)acrylic acid with amines may increase easiness in water-dispersibility but increase the viscosity of the aqueous dispersion, and neutralization with ammonia water may not increase easiness in water-dispersibility but decrease the viscosity of the prepared aqueous dispersion.
This patent includes alkylamine having a too low volatility to be used as coating agent for food packaging paper, and, thus, alkylamines may remain after coating and give off a bad smell.

Method used

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  • Method for preparing environmentally friendly paper coating agent by using water dispersible resin of ethylene-(METH)acrylic acid polymer, and use thereof
  • Method for preparing environmentally friendly paper coating agent by using water dispersible resin of ethylene-(METH)acrylic acid polymer, and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0094]240 g of NUCREL 2806 (acrylic acid content: 18 mass %, MFR=60 g / 10 minutes), 731.40 g of ion exchanged water, 4.00 g of DMEA, and 24.59 g of ammonia water were added to a 1500 ml autoclave, and then stirred at a temperature 100° C. at a stirring speed of 1200 rpm for 2 hours. Herein, a degree of neutralization of (DMEA+ammonia water) (a ratio of neutralization of an ethylene-acrylic acid-based copolymer with respect to a carboxylic group in terms of molar amount) was 75 mol %, and a mol % ratio of DMEA:ammonia water was 10:90. Then, the resultant product was cooled to 50° C. or less and then packaged, so that an aqueous dispersion was obtained. The obtained aqueous dispersion included solids of 24 mass % and had the viscosity of 7200 cps / 25° C.

example 3

[0095]230 g of NUCREL 2806 (acrylic acid content: 18 mass %, MFR=60 g / 10 minutes), 740.16 g of ion exchanged water, 11.51 g of DMEA, and 18.33 g of ammonia water were added to a 1500 ml autoclave, and then stirred at a temperature 100° C. at a stirring speed of 1200 rpm for 2 hours. Herein, a degree of neutralization of (DMEA+ammonia water) (a ratio of neutralization of an ethylene-acrylic acid-based copolymer with respect to a carboxylic group in terms of molar amount) was 75 mol %, and a mol % ratio of DMEA:ammonia water was 30:70. Then, the resultant product was cooled to 50° C. or less and then packaged, so that an aqueous dispersion was obtained. The obtained aqueous dispersion included solids of 23 mass % and had the viscosity of 10,000 cps / 25° C.

example 4

[0096]240 g of NUCREL 2806 (acrylic acid content: 18 mass %, MFR=60 g / 10 minutes), 735.06 g of ion exchanged water, 6.63 g of KOH, and 18.31 g of ammonia water were added to a 1500 ml autoclave, and then stirred at a temperature 100° C. at a stirring speed of 1200 rpm for 2 hours. Herein, a degree of neutralization of (KOH+ammonia water) (a ratio of neutralization of an ethylene-acrylic acid-based copolymer with respect to a carboxylic group in terms of molar amount) was 67 mol %, and a mol % ratio of KOH:ammonia water was 25:75. Then, the resultant product was cooled to 50° C. or less and then packaged, so that an aqueous dispersion was obtained. The obtained aqueous dispersion included solids of 24 mass % and had the viscosity of 1,850 cps / 25° C.

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Abstract

There is provided a method of manufacturing a paper-forming product formed of an environmentally friendly paper coating agent, which is excellent in water resistance, oil resistance, thermally adhesive property, and alkaline water-dissociative property, the method including mixing alkali metal hydroxide, amines, ammonia water, or the like with each of an ethylene-acrylic acid copolymer or an ethylene-(meth)acrylic acid copolymer or a mixture of these polymers, and using a water-dispersible coating solution prepared by adding FDA-approved matting agent, slip agent, and anti-foaming agent into a water-dispersible resin solution prepared by neutralizing the mixed product in an aqueous medium.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of manufacturing an environmentally friendly paper-forming product for food packaging, which is excellent in water resistance, oil resistance, thermally adhesive property, alkaline water-dissociative property, and the like, the method including mixing alkali metal hydroxide, amines, ammonia water, or the like with each of an ethylene-acrylic acid copolymer or an ethylene-(meth)acrylic acid copolymer or a mixture of these polymers, and coating paper with a water-dispersible coating solution prepared by mixing a water-dispersible resin solution prepared by neutralizing the mixed product with FDA-approved matting agent, slip agent, anti-foaming agent, and the like.BACKGROUND ART[0002]Generally, solids in food refer to water or oil or food including the same, and have been packed with a plastic bag, aluminum foil, a plastic wrapper, or the like. However, as the environmental problems have been worsened recently, it is urgent...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H19/12B65D65/38B65D3/06D21H21/16D21H27/00
CPCD21H19/12D21H21/16B65D65/38B65D3/06D21H5/0072C08J3/05C08J2323/08C08J2333/02C08L33/02D21H17/07D21H17/37D21H17/375D21H17/675D21H17/74D21H19/20D21H19/58C08J3/03C08L23/08C08L33/04
Inventor RHEE, BYEONG SEOK
Owner RHEE BYEONG SEOK
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