JPS6268877A - Peripheral rubber tape for footgear - Google Patents

Abstract

PURPOSE:The titled tape having improved bond strength to the peripheral part of footgear, obtained by providing one side of unvulcanized rubber tape with an adhesive layer containing a blocked isocyanate compound, liquid polyisoprene rubber and another ordinary compounding chemical for rubber in a specific ratio, respectively. CONSTITUTION:The adhesive layer 2 containing 100pts.wt. ordinary rubber, 10-20pts.wt. blocked isocyanate compound (e.g., ethylene diisocyanate, etc.,), 10-20pts.wt. liquid polyisoprene rubber (having preferably 10,000-60,000 average molecular weight) and another ordinary compounding chemical is formed on the single side 11 of the unvulcanized rubber tape 1, to give the aimed rubber tape. EFFECT:Appearance is good.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a peripheral rubber tape for footwear. 2. Description of the Related Art In the manufacture of footwear, particularly shoes, it is common practice to attach a rubber circumferential tape to the lower circumferential edge of the shoe cover to reinforce this area.

(Prior art) Conventionally, rubber compounding chemicals such as stearic acid, activated zinc white, vulcanization accelerator, sulfur, and fillers are added to the natural or synthetic rubber shown in Table 1 (&). sheeting,
An unvulcanized rubber footwear circumferential tape was prepared by cutting it to a certain width.

Then, on one side of the footwear peripheral rubber tape prepared in this way, a conventional rubber adhesive 4 shown in Table 1 (c) is applied and dried, and this is applied in the footwear manufacturing process as shown in FIG.
The same adhesive as above (referred to as Hanging Shelf 5) is applied in advance and pasted and crimped by hand around the bottom of the dry cover, then heated by a conventional method, and rubber tape and a separate adhesive are attached. The footwear was completed by vulcanizing an unvulcanized rubber sole that was glued to the underside of the footwear.

However, when adhering rubber tape to the bottom of the footwear in the footwear manufacturing process, a rubber adhesive layer (hanging shelf layer) is applied to a constant width around the bottom of the footwear, corresponding to the width of the rubber tape. However, it is difficult to completely cover this hanging shelf layer and apply the rubber tape accurately by hand at specified positions around the bottom of the cover, and the hanging shelf layer is exposed above the rubber tape. Rubber tape crimping work, etc. 1, -rb
r-ycv1ka04. Wow, there was a drawback that the maggots were contaminated and the appearance of the finished footwear was significantly degraded.

(Problems to be Solved by the Invention) The present invention aims to eliminate these drawbacks and provide a peripheral rubber tape for footwear that has excellent adhesive strength with the shoe cover and has a good outer w4.

(Means for Solving the Problems) This invention provides that on one side 11 of the unvulcanized rubber tape 1, 10 to 20 parts by weight of a blocked isocyanate compound and 10 to 2 parts by weight of liquid polyisoprene rubber are added to 100 parts by weight of ordinary rubber.
The gist of the invention is a peripheral rubber tape for footwear characterized by forming an adhesive layer 2 containing 0 parts by weight and other chemicals commonly used in rubber.

In this invention, the unvulcanized rubber tape 1 is made of natural rubber
, BBRSMBR, OR, etc., or a mixture of two or more thereof as a main component. In the present invention, as the ordinary rubber constituting the adhesive layer 2, one or a mixture of two or more synthetic rubbers such as natural rubber, BBR, MBR, OR, etc. is used.

In this invention, examples of the blocked isocyanate compound include ethylene diisocyanate, propylene diisocyanate, tetromethylene diisocyanate, hexamethylene diisocyanate, decamethylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, naphthylene diisocyanate, 4-4/
Ethylene bis(phenylisocyanate), ω・ω′−
diisocyanate), 1,3-dimethylbenzene, ω・ω
'-diisocyanate, 1,4-dimethylbenzene, 1
-methyl-2,4-diisocyanatecyclohexane,
ω・l-Diisocyanate diethylbenzene, ω・d-
Diisocyanate dimethyltoluene, ω・ω′-diisocyanate diethyltoluene, ω・d-diisocyanate dimethylxylene, ω・d-diisocyanate diethylxylene, ω・ω′-diisocyanate dimethylcyclohexane, 4.4'-methylene-bis(cyclohexyl isocyanate) , 4-4-ethylene-bis(cyclohexyl isocyanate), isophorone diamine diinocyanate, lysine diisocyanate. Incyanates such as diisocyanates obtained by addition reaction with molecular diols are combined with alcohols such as methanol, ethanol, ethoxyethanol, and methoxyethanol, aromatic amines such as diphenylamine and xylidine, konotarimide, heptatalimide, etc. imides, active methylene compounds such as acetylacetone and diethyl malonate, caprolactams such as e-caprolactam and butyrolactam, phenols such as phenol, cresol, and P-hydroxymethylbenzoate, oximes and imines such as cyclohexane oxime and methyl ethyl ketoxime, These blocked isocyanate compounds are blocked with a blocking agent such as urea, and when heated to 120°C to 170°C, the blocking agent is dissociated from the compound and converted into an isocyanate compound having an active isocyanate group. It is activated. These blocked isocyanate compounds are appropriately selected and used depending on the vulcanization temperature of the rubber tape 1, and those whose isocyanate groups are reactivated at a temperature equal to or lower than the vulcanization temperature of the rubber tape 1. In this invention, the amount of blocked isocyanate compound is limited to 10 to 20 parts by weight per 100 parts by weight of rubber in the formulation constituting the adhesive layer 2. If the amount is less than that, the rubber tape 1 The adhesive strength between the block isocyanate compound 3 and the block isocyanate compound 3 decreases, and if the amount is more than that, the adhesive layer 2 will discolor due to heating during vulcanization, and the block isocyanate compound itself is expensive, resulting in an increase in cost. This is because there is.

In this invention, the liquid isoprene rubber is an isoprene polymer, an isoprene polymer modified with a functional group such as maleic anhydride, or carfosyl, and has an average molecular weight of 10.
．． 000 to 60.000 is suitable. If the average molecular weight is less than that, the viscosity of the adhesive N2 becomes low, which tends to cause adhesion deviation of the rubber tape 1 when the rubber tape 1 is pressed, and the adhesive strength between the rubber tape 1 and the cover 3 tends to decrease. If the molecular weight is higher than that, the viscosity of the adhesive layer 2 will increase, the anchoring ability of the adhesive layer 2 to the laces 3 will decrease, and the adhesive strength of the rubber tape 1 to the laces 3 will tend to decrease. In the present invention, the amount of liquid polyisoprene rubber in the formulation constituting the adhesive layer 2 is limited to 10 to 20 parts by weight per 100 parts by weight of ordinary rubber. Ba,
There are disadvantages in that the anchoring ability of the adhesive layer 2 to the cover 3 is reduced, and the adhesive strength of the rubber tape 1 to the cover 3 is reduced.
Moreover, if the blending amount is more than that, the viscosity of the adhesive layer 2 will become low, which may cause the adhesion of the rubber tape 1 to slip when the rubber tape 1 is crimped, and the adhesive strength between the rubber tape 1 and the cover 3 may decrease. It is.

The adhesive layer 2 on the unvulcanized rubber tape 1 may be formed by lamination molding at the time of sheeting the unvulcanized rubber tape 1,
During the footwear manufacturing process, the unvulcanized rubber tape 1 is cut and formed in advance, and the lower peripheral layer 2 of the shoe cover 3 is reactivated with a solvent or the like immediately before being attached to the lower periphery of the shoe cover 3, if necessary. be.

Example An adhesive having the composition shown in Table 1 (b) was laminated to one side 11 of the rubber tape 1 formed by the composition shown in Table 1 (L) to a thickness of 0.5 when the rubber tape 1 was sheeted. was cut into appropriate widths to prepare a peripheral rubber tape for footwear of the present invention.

The peripheral rubber tape for footwear of the present invention prepared as described above is pressed with a pressure of 5 kg/d after the adhesive layer 2 is reactivated with toluene. Completed footwear with rubber tape attached.

Table 1 Note 1. Nielok Q-9061 (manufactured by Hirono Chemical Industry Co., Ltd.) A product in which liquid polybutadiene is made into a 9-urethane prepolymer by TD processing, and the active isocyanate groups are further blocked with phenols.

Note 2. L Engineering R-30 (manufactured by Clarei Soprene Chemical Co., Ltd.): Liquid polyisoprene rubber.

(Effects of the Invention) In the footwear completed by pasting the circumferential rubber tape for footwear of the present invention and the footwear completed by pasting the conventional peripheral rubber tape for footwear by the conventional method, the shoe cover 3 and the rubber tape 1 are different from each other. Table 2 shows a comparison of the adhesive strengths of the two.

As is clear from Table 2, in the present invention, a peripheral rubber tape for footwear was obtained which had superior adhesive strength between the sleeve 3 and the rubber tape 1 compared to the conventional example. The reason for this is that due to the good fluidity of the liquid polyisoprene rubber compounded in the adhesive layer 2 formed on one side of the rubber tape 1, when the rubber tape 1 is pressed onto the cover 3, a part of the adhesive layer 2 The adhesive is well anchored in the interstitial spaces of the adhesive layer 3, and the blocked isocyanate groups of the blocked isocyanate compound blended into the adhesive layer 2 are reactivated by heating during vulcanization. Therefore, it is thought that the adhesive strength between the rubber tape 1 and the cover 3 is enhanced.

Furthermore, when the peripheral rubber tape for footwear of the present invention is applied to the lower circumference of the shoe cover 3, the hanging shelf for the shoe cover 3 is omitted, which simplifies the footwear manufacturing process and prevents the shoe cover 3 from being contaminated by the hanging shelf. The appearance of the footwear is good.

Table 2: Adhesive strength between rubber tape and cover according to peel test of J-K5x6301 vulcanized rubber

[Brief explanation of drawings]

The drawings show examples, and FIG. 1 is a cross-sectional view of a main part of the peripheral rubber tape for footwear of the present invention, and FIG. 2 is a sectional view of the peripheral rubber tape for footwear of the present invention. FIG. 3 is a cross-sectional view of the main part of the footwear to which it has been applied; FIG. 3 is a cross-sectional view of the main part of the conventional footwear peripheral rubber tape; and FIG. 4 is the footwear peripheral rubber tape of FIG. 3 applied by the conventional method. FIG. 3 is a sectional view of a main part of the footwear. Explanation of symbols 1, Comtape 11. ...One side λ adhesive layer 3,
4. Adhesive 5. Hanging shelf 51,...
exposed hanging shelves

Claims (1)

[Claims] On one side 11 of the unvulcanized rubber tape 1, 10 to 2 parts of a blocked isocyanate compound is added to 100 parts by weight of ordinary rubber.
A peripheral rubber tape for footwear, characterized in that an adhesive layer 2 is formed by adding 0 parts by weight of liquid polyisoprene rubber, 10 to 20 parts by weight of liquid polyisoprene rubber, and other chemicals commonly used in rubber.