JPS6052700A - Paper coating composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to ethylene-vinyl acetate copolymer (hereinafter referred to as EVA
This paper is concerned with improving the blocking resistance of paper coating compositions using paper coating compositions.

Conventionally, EV has been used to impart surface gloss to items with various uses such as catalogs, pamphlets, advertisements, wrapping paper, etc. 2 for the purpose of surface protection.
A paper coating agent using A was applied. The composition of such paper coating agents includes aromatic petroleum resins, rosin, modified products thereof, hydrogenated products thereof, etc., alone or mixed, for the purpose of imparting hardness, gloss, and preventing blocking to EVA. has been done.

However, in recent years, machines have become faster in order to improve productivity, and blocking problems often occur. father,
Problems also tend to occur during stacking and storage in a warehouse or the like. If a large amount of such resin is added, blocking resistance is improved, but the flexibility of the coating agent is lost, flexibility, scratch resistance, etc. are deteriorated, and yellowing is also caused, making it undesirable as a coating agent. do not have.

In view of this situation, the present inventors conducted studies and found that 10 to 10 parts of a copolymer of dicyclopentadiene and maleic anhydride (hereinafter referred to as D-M polymer) was added to 100 parts by weight of EVA. The inventors have discovered that a composition prepared by adding 500 parts by weight has improved blocking resistance, and have arrived at the present invention.

That is, the present invention provides an ethylene-vinyl acetate copolymer comprising 10 to 500 parts by weight of a copolymer resin of dicyclopentadiene and maleic anhydride to 100 parts by weight of the ethylene-vinyl acetate copolymer as an organic solvent solution. The present invention relates to a polymer-based paper coating composition.

The EVA used in the present invention is not particularly limited, but in consideration of adhesion to paper, compatibility with the DM polymer, etc., EVA having a vinyl acetate content of 40 or more is preferable. Although the molecular weight of the DM polymer is not particularly limited, it is practically preferably about 1,000 to 20,000.

The copolymerization ratio of dicyclopentadiene and maleic anhydride in the D-M polymer is 0.5 to 2 moles of maleic anhydride to 1 mole of dicyclopentadiene, and the polymer thus obtained has a softening point. It's something you don't have. D-M
The polymer is obtained by placing dicyclopentadiene, maleic anhydride, a solvent, and a catalyst in a reactor, heating it while stirring, and after the reaction is completed, separating unreacted substances from the solvent.

The composition of the present invention can be obtained by dissolving and mixing BVA and DM polymer in an organic solvent, but it is convenient to dissolve them all at once in a single solvent or a mixed solvent that dissolves both.

FiVA solvents include esters, aromatics, etc.
As the solvent for the M polymer, esters, ketones, nitrogenated solvents, ethers, etc., or mixed solvents containing these in an amount of 50% by weight or more are used.

1! iVA 100 overlapping parts, DM polymer 1
0 to 500 parts by weight, preferably 50 to 300 parts by weight, are mixed, but if it exceeds 500 parts by weight, the coating film will lose its flexibility and is not economically suitable9]. Further, if the amount added is less than 30 parts by weight, the effect of improving the progging resistance is small.

The solution concentration can be arbitrarily selected depending on the line speed during coating, etc., but is usually used in the range of 50% by weight to 5% by weight.

The present invention will be specifically described below with reference to Examples.

The D-M polymer was obtained by placing cyclobentadiene, maleic anhydride, a solvent, and a catalyst in a reactor and heating it while stirring, and after the reaction was completed, the solvent and unreacted materials were separated. .

The general properties of the product include acid value (210), molecular weight (
8000), and the softening point.

Example 1 Commercially available KVA (vinyl acetate content 60% by weight).

M155. 100 parts by weight of the DM polymer was added to 100 parts by weight (R&B softening point: 158°C), and a 30% by weight solution was prepared using a solvent (ethyl acetate:toluene = 1:1 (weight ratio)). Coat this on a test paper using a 412 percoater) 1. ．． Drying was performed for 20 seconds in a gear oven at 80°C. After that, a constant temperature and humidity room (23℃, 55℃R)
H) for 24 hours and used as a test piece. Using this test piece, blocking test 1 surface gloss and adhesion were measured.

For the blocking test, the test piece was cut into 4 crn x 4 pieces, and the coated surfaces were placed at 50°G.

Tests were conducted at temperatures of 40°C, 50°C, and 60°C, and after the test pieces were removed, they were returned to room temperature and peeled off briefly.

The relative humidity at each temperature was 80 degrees, and the load was 150 g/d. The surface gloss was measured using a Suga Test Machine KK# gloss tester at an incident angle of 60 degrees.

For adhesion, cellophane tape (manufactured by Chiban) was applied to the coated surface and rubbed lightly, then quickly removed and the condition observed. The results are listed in Table 1.2.

Example 2 17% D-M to 100 parts by weight of F4A used in Example 1
200 parts by weight of polymer was added to prepare a 30 parts by weight 11% solution using the same solvent composition as in Example 1.

Two test conditions were based on Example 1.

The results are listed in Table 1.2.

Example 3 300 parts by weight of the DM polymer was added to the parts by weight of KVAIQO used in Example 1, and a 30% by weight solution was prepared using the same solvent composition as in Example 1.

One test condition was based on Example 1.

The results are shown in Tables 1 and 2.

Comparative Example 1 Aromatic petroleum resin (molecular weight 1300. R&B softening point 100°C) was added to 100 parts by weight of EVA used in Example 1.
100 parts by weight was added to prepare a 30% by weight solution using the same solvent composition as in Example 1.

Two test conditions were based on Example 1.

The results are shown in Tables 1 and 2.

Comparative Example 2 200 parts by weight of the aromatic petroleum resin used in Comparative Example 1 was added to 100 parts by weight of EVA used in Example 1, and a 30% by weight solution was prepared using the same solvent composition as in Example 1. and 1
．． Ta.

One test condition was based on Example 1.

The results are listed in Table 1.2.

Comparative Example 5 Comparative Example 1 was compared to BVA100 heavy duty part used in Example 1.
200 parts by weight of the aromatic petroleum resin used in Example 1 was added, and a 30-duty solution was prepared using the same solvent composition as in Example 1.

The nine test conditions were based on Example 1.

The results are listed in Table 1.2.

Table 1: Evaluation criteria for anti-blocking test results (0: No peeling on the entire surface (4) Peeling is observed on part of the entire surface (3) Partial peeling is observed in several places on the entire surface (2) On the entire surface Severe peeling +1)
Items peeled off from inside the test paper Table 2 Physical properties of the coating film * ◎ Destruction from inside the test paper ○ Destruction between the coating agent layer and the test paper As is clear from the test results in Table 1, the D-M polymer of the present invention It goes without saying that the additive composition has significantly better blocking resistance than conventional additive compositions, and also has better surface gloss and adhesion, as shown by the test results in Table 2. One thing is clear.

Patent Applicant Toyo Soda Kogyo Co., Ltd. Tewa 1 Masaaki Miura May 7, 1980 Mr. Kazuo Wakasugi, Commissioner of the Patent Office 1 Indication of Case 1988 Patent Application No. 159038 Bow 2 Name of Invention Composition for Paper Coating 6 Telephone number of the person making the amendment (5851 Roro 11) 4. The date and month of the supplementary city order. 5. The number of inventions to be increased by the amendment. 6. The number of inventions to be increased by the amendment. Column 7 Contents of amendment (1) The scope of claims in the specification is amended as shown in the attached sheet.

(2) [200J is l'-3, OO as described in page 8, line 8.
Correct to J.

2 Claim 11: An ethylene-vinyl acetate copolymer comprising 10 to 500 parts by weight of a copolymer resin of dicyclopentadiene and maleic anhydride as an organic solvent solution based on 100 parts by weight of the ethylene-vinyl acetate copolymer. Polymeric paper coating composition.

Claims (1)

[Claims] 1. Ethylene-vinyl acetate copolymer paper comprising 10 to 500 parts by weight of a copolymer resin of dicyclopentadiene and maleic anhydride as an organic solvent solution per 100 parts by weight of ethylene-vinyl acetate copolymer. Composition for coating.