JPH0222777B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water-soluble and heat-sealable adhesive for temporarily fixing interlining used in powder form, which has little adhesion between powders and can be easily applied with a household iron or the like. The present invention relates to an adhesive for temporarily fixing interlining that can be heat-sealed and can be easily removed by washing with cold water.

Traditionally, adhesive interlining has been used in garment sewing to speed up the process. Adhesive interlining is a garment product made by using a nonwoven fabric as a base fabric and coating it with a thermoplastic resin such as polyethylene resin, polyvinyl chloride resin, polyamide resin, or ethylene monovinyl acetate copolymer. . There are two types of adhesive interlining: permanent adhesive types and temporary adhesive types, but temporary adhesive types in particular require the adhesive to be removed by dry cleaning or washing with water after sewing. Recently, there has been a strong demand for temporary adhesive type interlining that can be washed with water, and research on this topic is active.

The present inventors have developed a water-soluble and heat-fusible adhesive with an average degree of polymerization of 50 to 300 and a residual acetic acid group of 15 to 50.
We proposed adhesives made by adding mol% of polyvinyl alcohol (hereinafter referred to as PVA) or PVA with a plasticizer and ethylene monovinyl acetate copolymer (JP-A-51-96832, JP-A-51-51). No. 106140,
(Japanese Patent Application Laid-open No. 106183/1983). All of these are water soluble,
In addition, it is a heat-sealing type and can be used for temporary fixing of interlining. However, in this method of spraying adhesive powder and heat-sealing it, since the adhesive is originally water-soluble, the powders stick to each other in high temperature and humidity, causing a phenomenon called blocking. There was a problem that it was interfering with the work.

As an anti-blocking agent to solve such problems, Japanese Patent Application Laid-open No. 54-76635,
No. 54-42469 proposes the use of finely powdered silicic acid, higher fatty acid salts, aliphatic amide compounds, and the like. Finely powdered silicic acid has long been well known as an anti-blocking agent for PVA. However, the use of silicic acid increases the heat-sealing temperature of the adhesive, and the silicic acid is hard when cutting after tacking, which can easily damage the cutter blade, and even when washed with water. PVA becomes difficult to completely disperse,
It has the disadvantage of being difficult to dissolve. Further, higher fatty acid salts have the disadvantage that the waste water after washing becomes alkaline. Furthermore, aliphatic amide compounds have the disadvantage of poor thermal stability, causing insolubilization and coloring. In any case, when using partially saponified PVA-based powder type water-soluble and heat-sealable adhesives, it is necessary to use an antiblocking agent together, but conventionally known antiblocking agents Because of these drawbacks, the development of this type of adhesive is currently delayed.

The present inventors have conducted extensive research on antiblocking agents that have overcome these conventional drawbacks, and have found that a specific fine powder PVA does not have the drawbacks of conventional antiblocking agents, and that such specific fine powder PVA does not have the drawbacks of conventional antiblocking agents.
If a specific amount of the adhesive is used as an anti-blocking agent, the adhesive can be sprayed in fine powder form without causing any blocking phenomenon, and it can be easily heat-sealed, and furthermore, it can be easily removed by washing with water after sewing. The present invention was achieved based on the discovery that an agent can be obtained.

That is, the present invention provides an anti-blocking agent with an average polymerization degree of 100 to 600, a saponification degree of 35 to 85 mol%, and a particle size of 20 to 200 mesh for 100 parts by weight of fine powder PVA(A). ~3000, degree of saponification
This is a water-soluble and heat-sealable adhesive for temporary interlining, which contains 1 to 50 parts by weight of finely powdered PVA (B) with a particle size of 95 mol % or more and finer than 100 mesh.

The range of the average degree of polymerization of PVA(A) in the present invention is
100 to 600, preferably 200 to 400, but this is because PVA with an average degree of polymerization of less than 100 cannot be obtained at low cost, and when it is less than 100, the cohesive force of PVA decreases.
This is because poor adhesion may result, and on the other hand, if it exceeds 600, the thermal fusion temperature and melt viscosity will increase. In addition, the saponification degree of PVA(A) ranges from 35 to
The content is 85 mol%, preferably 45 to 55 mol%, but this is because if it is less than 35 mol%, water dispersibility will be lost, and if it exceeds 85 mol%, heat fusion properties will be extremely reduced. It's for a reason. In addition, the particle size of PVA (A) is 20 to 200 mesh, but if the particle size is coarser than 20 mesh, the temperature required for heat fusion will be high, the required pressure will be large, and the time required for bonding will be longer. This is because, if the interlining becomes finer, fine particles will become embedded in the interlining, reducing the adhesive effectiveness. The particle size varies depending on the type of interlining, but a range of 60 to 150 mesh is particularly desirable. Additionally, PVA(A) is usually used alone;
If it is desired to further lower the heat fusion temperature, plasticizers commonly used for PVA, such as polyethylene glycol, sorbitol, sorbitol modified products, and glycerin, may be used. The plasticizer is preferably blended in an amount of 0.1 to 100 parts by weight with 100 parts by weight of PVA(A). Plasticizers may be added to finely powdered PVA, but PVA after saponification
A desirable method is to uniformly mix the material into a slurry or solution, then melt-dry and pulverize it. The manufacturing method of PVA(A) is not particularly limited, but
Obtained by polymerizing vinyl acetate in an alcohol having a chain transfer constant of 20 x 10 ^-4 or more at the polymerization temperature as described in Japanese Patent Application Laid-open No. 51-87542. Preferably employed is a method in which polyvinyl acetate is dissolved in an aliphatic alcohol having 1 to 4 carbon atoms, and an alkali is added to saponify it to obtain partially saponified PVA, which is then pulverized. fine powder
The mill for obtaining PVA is preferably one that can be used at a product temperature of 50°C or lower, and various fine mills are used, but a turbo mill is most suitable. To mix a plasticizer with PVA, a method is preferably employed in which the PVA is heated above its melting point, the plasticizer is added thereto, and the mixture is melted and dried using a vented extruder. In addition, PVA(A) used in the present invention
may be modified as long as it does not impair the effect of the present invention.
Even if it is PVA, there is no problem.

If the average degree of polymerization of PVA (B), which is an anti-blocking agent, is less than 100, the moisture absorption rate is high and the anti-blocking effect will be low.If it exceeds 3000, it will be difficult to obtain a fine powder, so it is recommended to have an average degree of polymerization of 100 to 3000 to reduce the manufacturing cost. Considering this, it is preferably 500 to 1800. If the degree of saponification is less than 95 mol%, the effect will decrease due to high moisture absorption, so it is 95 mol% or more, preferably 99 mol% or more. In addition, when the particle size becomes coarser than 100 mesh, it is necessary to increase the amount used, and as a result,
It is preferable to use a material finer than 100 mesh, especially a fine powder, as it will reduce the heat fusion properties of the adhesive. PVA (B) is produced by polymerizing vinyl acetate using a radical initiator in an alcohol such as methanol, and then quenching the resulting polyvinyl acetate in an alcohol solution such as methanol in the presence of an alkali such as hydric soda. Ordinary PVA obtained by
As in the case of PVA(A), pulverized products are preferably used, and the polymerization method and saponification method are not particularly limited. For example, suspension polymerization and suspension saponification are used, but especially PVA with a low degree of polymerization To use (B),
The method used for producing PVA(A) is preferably employed. In addition, PVA(B) used in the present invention is
Modified PVA may be used as long as it does not impair the effects of the present invention.

In the adhesive of the present invention, the blending ratio of PVA(A) and PVA(B) is 1 to 50 parts by weight of PVA(B) to 100 parts by weight of PVA(A). 5 to 20 parts by weight is desirable in order to make the most of the content.

The method for producing the adhesive of the present invention by blending PVA(A) and PVA(B) is not particularly limited as long as the two components can be mixed uniformly;
It is desirable to use an apparatus that does not exceed 50°C, and for example, a V-type mixer, a ribbon-type mixer, a screw mixer, etc. are preferably used in a batch type or continuous type.

Since the adhesive of the present invention melts at a relatively low temperature of 120 to 160°C, it can be easily heat-sealed using an iron press or the like, so it will not damage fabrics. Moreover, since it can be dissolved and dispersed and removed by washing, etc., the texture will not be affected. Further, when manufacturing adhesive interlining, the work is easy to do without causing any blocking phenomenon even when the environment in which fine powder of adhesive is sprinkled onto the interlining is hot and humid, such as in the summer. Furthermore, the amount of adhesive to be fused to the interlining is 10 to 30 g/m ²
The adhesive strength when layered with the outer material and heat-sealed (setting time 7 seconds, pressure 0.3 kg/
cm ² , temperature 150° C.) is 300 to 700 g/inch, which is practically sufficient.

Hereinafter, the present invention will be explained in more detail with reference to Examples. In addition, "parts" in the examples means "parts by weight."

Example 1 Average degree of polymerization 250, degree of saponification 50 mol%, particle size 100~
200 mesh PVA 100 parts, average degree of polymerization 1700,
Saponification degree 99.5 mol%, particle size 200-300 mesh
A water-soluble and heat-sealable adhesive was obtained by uniformly blending 5 parts of PVA.

This fine powder adhesive is placed in an environment of 40℃ and RH60%.
Although it was left for 24 hours, almost no blocking phenomenon occurred. Next, this adhesive was sprinkled on the batted interlining at a rate of 20g/ ^m2 using 95 pieces/inch of No. 16 single yarn made of polyester/cotton blend, and dried at a rate of 20m/min in a hot air dryer at 160°C. The adhesive was temporarily fixed to the interlining by passing the adhesive at a high speed to create an adhesive interlining. Even when this adhesive interlining was left in an environment of 40°C and 60% RH for 24 hours, it did not become sticky. In addition, when a polyester/cotton blend broad count 40 outer material is layered on this adhesive interlining and heat-sealed for 7 seconds at 150°C and 0.3 kg/ ^cm2 , the adhesive strength is 300 to 500 g/cm2.
2, and had no coloring. Furthermore, after sewing, the adhesive part was washed with room temperature water for 10 minutes and then observed using iodine coloring, but only a very slight coloring was observed, and most of the PVA had been dissolved or dispersed. Also, the rinsing liquid for washing was neutral.

Example 2 PVA100 with average polymerization degree of 400 and saponification degree of 55 mol%
Part is a mixed solution of methanol, methyl acetate and water
After uniformly dissolving 20 parts of sorbitol in the saponified solution of 100 parts, melt-dry and crush using a vented extruder to obtain a particle size of 100~
150 mesh of plasticized PVA was obtained. this
PVA with average polymerization degree of 1000 and saponification degree of 99.8 mol%,
10 parts of PVA with a particle size of 200 to 300 mesh was blended to obtain a water-soluble and heat-fusible adhesive.

This fine powder adhesive is placed in an environment of 40℃ and RH60% for 24 hours.
Although it was left to stand for a while, almost no blocking phenomenon occurred. Next, this adhesive was sprinkled on the same interlining used in Example 1 at a rate of 10 g/m ² and heated to 160°C.
The adhesive was temporarily fixed on the interlining by passing it through an infrared dryer at a speed of 30 m/min to create an adhesive interlining. This adhesive interlining can also be stored in an environment of 40°C and 60% RH for 24 hours.
Even after leaving the two sheets stacked for hours, they did not become sticky. In addition, this adhesive interlining is sandwiched between the front and lining of the jersey of women's dress fabric.
When heat-sealed for 7 seconds at 140° C. and 0.3 kg/cm ² , the adhesive strength was 250 to 350 g/cm and there was no coloration. Furthermore, after machine sewing, the adhesive strength was measured after washing with room temperature water for 10 minutes and air drying, and it was found to be zero.Also, when the sewing thread was untied and the adhesive part was observed with iodine coloring, there was very little coloration. Most of the PVA was removed by dissolution or dispersion. Also, the rinsing liquid for washing was neutral.

Example 3 To 100 parts of modified PVA with an average degree of polymerization of 200, a degree of saponification of 60 mol%, a degree of modification of vinyl acetate of 3 mol%, and a particle size of 100 to 200 mesh, an average degree of polymerization of 600, a degree of saponification of 99.3 mol%, and a particle size of 200 to 200. 300 mesh PVA5
A water-soluble and heat-sealing adhesive was obtained by blending the following parts.

When the physical properties of this adhesive were measured under the same conditions as in Example 1, there was no blocking phenomenon of the powder and no pricking of the adhesive interlining. Furthermore, the adhesive strength with the broadcloth fabric was sufficient at 300 to 550 g/inch, and there was no coloration, and most of the PVA was dissolved or dispersed and removed even after washing. Also, the rinsing liquid for washing was neutral.

Comparative Examples 1 to 3 In Example 1, the average degree of polymerization was 1700, and the degree of saponification was
A fine powder adhesive that does not contain PVA with a particle size of 99.5 mol% and a particle size of 200 to 300 mesh (Comparative Example 1), and in Example 2, does not contain PVA with an average polymerization degree of 1000, a saponification degree of 99.8 mol%, and a particle size of 200 to 300 mesh. A fine powder adhesive (Comparative Example 2) and a fine powder adhesive without PVA having an average polymerization degree of 600, a saponification degree of 99.3 mol %, and a particle size of 200 to 300 mesh were obtained in Example 3 (Comparative Example 3).

Add each of the above fine powder adhesives at 40℃ and RH60%.
When these adhesives were left in an environment for 24 hours, a blocking phenomenon occurred in all cases, and these adhesives could not be sprayed onto the interlining.

Claims (1)

[Claims] 1 Average degree of polymerization 100-600, degree of saponification 35-85 mol%
and 100 parts by weight of fine powder polyvinyl alcohol (A) with a particle size of 20 to 200 mesh, and as an anti-blocking agent, a fine powder with an average degree of polymerization of 100 to 3000, a degree of saponification of 95 mol% or more, and a particle size of less than 100 mesh. A water-soluble and heat-sealable interlining temporary adhesive comprising 1 to 50 parts by weight of powdered polyvinyl alcohol (B).