JPS58120661A - Resin composition for releasing materials - Google Patents

Abstract

PURPOSE:The titled composition that is made by mixing a terpolymer emulsion of vinyl acetate-ethylene-a functional group-containing vinyl monomer, an amino resin and a silicone resin, thus giving releasing paper of good quality through one-step application. CONSTITUTION:(A) An emulsion of terpolymer from vinyl acetate, ethylene and a monomer with functional groups such as glycidyl methacrylate at a weight ratio of (70-95):(4-29):(1-10) or its modified product (20-90wt%), (B) an amino resin such as methylolated or alkoxylated triazine resin (5-40wt%) and (C) a silicone resin, preferably an emulsion type resin (5-75wt%) are mixed under stirring to give the objective composition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a release material with good releasability, particularly to a resin composition for release paper.

Conventionally, release materials have been manufactured by coating and layering resins such as silicone, vinyl chloride resin, vinylidene chloride-vinyl chloride copolymer resin, and polyethylene on base materials such as paper materials and plastic films. However, silicone tree 1
When using 1 m, the silicone resin is immersed in the paper material, so a method is used in which the paper material is coated with an anchor coat, such as polyethylene resin, and then silicone &k is applied. The method has the disadvantage of requiring 2 steps and 8 trials. Furthermore, when vinyl chloride I resin, polyethylene 66B11, or the like is used, there are drawbacks such as a poor peeling effect on the target substance or a narrow range of applicability.

In order to solve these drawbacks, the present inventors have made intensive research to develop a copolymer emulsion consisting of vinyl acetate with a specific heptamer composition, ethylene, and a vinyl ester having a functional group.
A composition made by blending Resin 1 or its modified product, 7Mino resin, and silicone side in a specific ratio reduces the coating process to a release material in one step, and has excellent releasability to the target object, making it suitable for release materials. The present inventors have discovered that the method is extremely effective and have completed the present invention.

That is, the present invention provides (A) erP acid vinyl I, and the composition of vinyl 4 monomer having ethylene and a functional group is 7 in weight ratio.
0-96:4-29:20-90% by weight of a copolymer emulgene or a modified product thereof, 0-96:4-29:1-10% by weight, 0-amino resin M5-40% by weight, and 5-7% silicone resin.
This is a resin composition for a release material whose main component is 6N1% (all solid content).

The copolymer emulgene made of vinyl acetate, ethylene, and a vinyl tL/carbon polymer having a functional group used in the present invention is made of vinyl acetate, which is a raw material monomer. The composition ratio of ethylene and a vinyl monomer having a functional group is 70 to 95:4 by weight.
-29: A copolymer of 1 to 10 or a modified product thereof, in which case the ethylene content exceeds 29% by weight or the vinyl monomer having a functional group contains 13! If the amount of ethylene is less than 4% by weight or the vinyl monomer having a functional group exceeds 10% by weight, the resulting resin composition for release materials will easily cause blocking and have poor peelability. The folding durability is poor and the effect of the present invention becomes #koji.

In the present invention, the vinyl monomer having a functional group includes a glycidyl group, a levoxy group, and a glycidyl group. Shi group, sulfonic acid group, hydroxyl sulfonic acid group, amide group, N-methylolamide group,
is a monomer having an I recoxymethyl r reamide group,
For example, glycidyl methacrylate, acrylic acid, methacrylic acid, β-hydroxyethyl acrylate, β
-Hydroxyethyl methacrylate, acrylamide, N-methylolacrylamide, N-butoxymethyI
Examples include rarecrylamide, vinyl sulfonic acid, and the like.

The copolymer consisting of vinyl acetate, ethylene, and a vinyl monomer having a functional group used in the present invention is 10% by weight based on the total of the raw materials vinyl acetate, ethylene, and a vinyl monomer having a functional group. It may be a modified product obtained by copolymerizing and modifying a vinyl monopolymer that can be copolymerized, such as vinyl esters such as vinyl propionate and vinyl versatate, and (meth)acrylic acid esters such as methyl acrylate and methyl methacrylate. .

The amino resin used in the present invention is, for example, one based on a triazine type such as melamine or benzogane-1-ananone, or an aldehyde condensate such as urea, in which part or all of the free methylo-θ groups are alkoxylated. .

In addition, amino resins containing a large number of methyl-r groups and imino groups are advantageous in the case of low-temperature heating. When an amino resin curing catalyst is used, curing can be performed by heating at a lower temperature, which is more convenient. The amino resin curing catalyst is, for example, p
- Free acids such as toluenesulfonic acid, silicic acid, fornic acid, their amine salts or ammonium salts, or acid anhydrides;
Examples include those that produce acids upon thermal decomposition, such as phosphoric acid esters, sulfuric esters, acid amides, imidodisulephonic acids, and nitrilos-lephonates.

The silicone resin used in the present invention is of the most commonly used solvent or emulscene type, but especially for communication, the emulseen type is water-based, which saves resources.For example, 5M-7270 (solid resin) Examples include Type Min Aoi 凰%, Toray Silicone Co., Ltd. product), etc. These silicone-B- can be used as a melting medium such as 5M-7271 (
A silicone dynamic catalyst (solid content: 40% by weight, manufactured by Toray Silicone Co., Ltd.) may also be used in combination.

The resin composition for a release material of the present invention is a copolymer emulgene or a modified product thereof consisting of vinyl acetate, ethylene, and a vinyl monomer having a functional group having a specific Zimmer ratio of 20 to 90%. Shape preferably 40-80
Amino resin 5-40 weight%, more preferably 18-86 weight%, silicone resin 5-75 weight%, preferably 8-60 weight% (all solid content) It is something.

If Emulgene or its modified product is less than 20% by weight, the silicone resin in the fMBFi composition will penetrate into the base material and uniform coating will not be possible, and if it exceeds 90% by weight, the composition will be damaged. The effect of the present invention cannot be fully expected, as the releasability of the release material obtained by coating decreases.In addition, if the silicone resin is 5% by weight without swirling, the releasability is poor, and if it exceeds 76% by weight, the releasability is poor. The silicone resin penetrates into the release material more and the coating becomes uniform and dark.

Furthermore, if the amino resin content is less than 5% by weight, the blocking resistance will be poor, and if it exceeds 40% by weight, the coating will become hard and the folding durability will deteriorate.

The resin composition for a release material of the present invention may optionally contain a resin such as a styrene-acrylic copolymer Ema-Resine, a catalyst such as a metal complex compound such as lead, a shedding preventive agent, and a wetting agent. , various additives such as inorganic pigments can also be added.

In carrying out the present invention, the above-mentioned vinyl acetate 1, ethylene,
It is sufficient to mix amino resin and silicone-84 with heavy hot water to a co-articulated polymeric resin consisting of vinyl monomers containing functional groups or a modified product thereof, and then thoroughly heat the mixture to homogenize it. .

The resin composition for a release material of the present invention thus obtained is obtained by coating a base material such as paper cellophane or a synthetic resin film by a conventional coating method such as gravure roll coating. For example, it is used for labels in the industrial and commercial packaging sectors, processed paper such as backing paper for stickers, or what is generally called release paper.

The present invention will be explained below with reference to Examples.

Example 1 Vinyl acetate-ethyl L/N-N-methylolacrylamide copolymer emulsion value (solid form) in which the seven-mer composition ratio (mlk ratio) of vinyl acetate, ethylene, and N-methylolacrylamide is 89 = 7:4. 5 o, 9 consideration%), melamine tree Bw as Sumimar 1km-80W (product of Sumitomo Chemical Co., Ltd., solid content 77.0%) and silicone tree & 5M
-7270 and 5M-7, a catalyst for silicone resins
271 were mixed in the solid amounts shown in Table 1, and the mixture was coated on kraft paper using a bar coater. This was then heated and dried in a hot air dryer at 145° C. for 1 minute to prepare a release paper, and a release test was conducted at room temperature.

That is, a kraft tape was applied in the coating direction of the release paper, and after being left for 2 days, it was peeled off and its releasability was evaluated.

The results obtained were recorded on scales of grades 1 to 10 and are shown in Table 1. In this case, grade 1 means that it could be peeled off very easily and that the peelability was excellent.
Grade 0 means that the kraft tape adheres to the coated surface of the release paper and is not easily peeled off, meaning that the releasability is extremely poor.

Example 2 In Example 1, vinyl acetate I was used as vinyl acetate-ethylene-N-methylol acrylamide copolymer 7 Margene, and the seven-mer composition ratio (weight ratio) of ethylene and N-methylol acrylamide was 76: Example 1 was carried out in exactly the same manner as in Example 1, except that a 20:4 vinyl acetate-ethylene-N-methylo-reaacrylamide copolyester (solids content 50.8 weight) was used. The results of the peel test obtained are shown in Table ts1.

Comparative Example 1 #I vinyl frame used in Example 1 and Example 2 tyrene-N-methylol acrylic I Ti F copolymer Emma I resin 1, Summar t M-80W, silicone resin 5M
-7270 and 5M-7271 as shown in Table 1.
The same procedure as in Example 1 was carried out except that the mixture was mixed in 8 subcombinations. The results of the peel test are shown in Table 1.

Procedural amendment (voluntary) October 1, 1981, 1, Indication of the case, 1982 Patent Application No. 4235, 2, Name of the invention: Resin composition for exfoliation material 3, Person making the amendment Relationship to the case Patent Applicant 5-15 Kitahama, Higashi-ku, Osaka (209) Sumitomo Chemical Co., Ltd. Representative Takeshi Hijikata 4, Agent 5-15-5 Kitahama, Higashi-ku, Osaka, Detailed description of the invention in the specification to be amended 6. Contents of the amendment (1) On page 4, line 17 of the specification, the phrase [vinyl propionate within 10% by weight] is corrected to read "vinyl chloride, vinyl propionate within 10% by weight."

(2) On page 4, line 20, the phrase "(meth)acrylic esters, etc." is corrected to "acrylic esters, methacrylic esters, etc."

that's all

Claims (1)

[Claims] (2) The composition of vinyl acetate, ethylene, and a vinyl monomer having a functional group is 70 to 9.5 = 4 to 29:1 in deuterium ratio.
20 to 90 copolymer Emulgene or its modified product which is ~1O, (B amino #d fat 5 to 40%
and (Q) A resin composition for a release material containing 5 to 75% by weight (all solid content) of a silicone resin as a main component.