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Double-sided pressure-sensitive adhesive tape

A technology of pressure-sensitive adhesive tapes and pressure-sensitive adhesives, applied in adhesives, film/sheet-like adhesives, fabrics, etc., can solve shrinkage wrinkles, prevent shrinkage wrinkles, etc.

Inactive Publication Date: 2008-03-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nonwovens impregnated with impregnants tend to cause shrinkage and wrinkling when transferring pressure sensitive adhesives to fabrics, requiring tension adjustments
Also, when applying pressure sensitive adhesives directly, the problem cannot be overcome simply by adjusting the tension
[0007] When the pressure-sensitive adhesive layer is formed by direct application, good yields are provided, especially in the case of a double-sided pressure-sensitive adhesive tape utilizing a nonwoven fabric containing an impregnating agent and having a small tape elongation as a carrier, hitherto No effective method has been proposed to prevent shrinkage wrinkling during production or storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Nonwovens were obtained by passing 100% Manila hemp through an inclined short-wire paper machine and applying a 2.0% aqueous solution of carboxymethylcellulose (CMC) through a size press system. The basis weight of the nonwoven thus obtained was 15 g / m 2 , the density is 0.21g / cm 3 , The warp-to-weft ratio is 89%.

[0078] On the other hand, 5 parts by weight of acrylic acid, 95 parts by weight of butyl acrylate, and 200 parts by weight of toluene as a polymerization solvent were added to a three-necked flask, and they were stirred for 2 hours while nitrogen gas was introduced thereinto. After oxygen was removed from the polymerization system in the above-mentioned manner, 0.1 parts by weight of benzoyl peroxide was added. The temperature was raised to 65°C to allow the polymerization to proceed for 3 hours, then at 80°C for 2 hours. The weight average molecular weight of the acrylic polymer thus obtained was 550,000. 2 parts by weight of an isocyanate crosslinking ...

Embodiment 2-4

[0081] In each of Examples 2 to 4, a 50 mm wide double-sided pressure-sensitive adhesive tape (in the form of a roll) was obtained in a similar manner to Example 1, except that as shown in Table 1, no tapes different in basis weight, density, etc. were used. Except for spun cloth (prepared by papermaking steps using nip rolls).

Embodiment 5

[0083] In a similar manner to Example 1, a 50 mm wide double-sided pressure-sensitive adhesive tape (in the form of a roll) was obtained by using the nonwoven fabric in Example 1 as a carrier, but changing the method of forming the pressure-sensitive adhesive layer to For simultaneous application on both surfaces, as indicated in Table 1.

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Abstract

The present invention relates to a double-sided pressure-sensitive adhesive tape comprising a nonwoven fabric as a support; one pressure-sensitive adhesive layer disposed on one side of the support; and another pressure-sensitive adhesive layer disposed on the other side of the support, wherein the nonwoven fabric consists of Manila hemp and is impregnated with carboxymethyl cellulose. The double-sided pressure-sensitive adhesive tape according to the invention can be produced with a high productivity, does not cause shrinkage wrinkles even when prepared by direct application, and has good blanking workability owing to its small elongation and excellent strength.

Description

technical field [0001] The invention relates to a double-sided pressure-sensitive adhesive tape using non-woven fabric as a carrier. In particular, the present invention relates to a double-sided pressure-sensitive adhesive tape excellent in punching workability for molding or forming materials made of metal, plastic, etc. and products such as plastic and foamed products Bonding between components. Background technique [0002] Due to its convenient application and good adhesive properties, double-sided pressure-sensitive adhesive tapes are widely used for bonding between molded or formed products and components of home electronics and office automation equipment. For example, there is known a releasable double-sided pressure-sensitive adhesive tape comprising a nonwoven fabric as a carrier and pressure-sensitive adhesive layers arranged on both sides of the carrier, which is characterized in that it is The strength at the yield point in the direction is 20-40 (N / 20mm), th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/21
CPCC09J7/048C09J2201/128C09J2400/263C09J7/21C09J7/205Y10T428/28Y10T442/277Y10T442/2049Y10T442/2762C09J2301/124
Inventor 岸冈宏昭大路胜也
Owner NITTO DENKO CORP
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