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Article comprising microcapsules for on-demand adhesion and method for producing the same

A technology for microcapsules and products, applied in the field of manufacturing said products, capable of solving problems such as premature adhesion of undesired surfaces

Active Publication Date: 2019-07-19
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

with figure 1 For the microcapsule-containing PSA of the article depicted in , this characteristic will allow the surface of the substrate 16 to build up adhesion over an extended period of time without even rupture of the microcapsules 12, which will lead to premature failure of the undesired surface. Adhesion

Method used

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  • Article comprising microcapsules for on-demand adhesion and method for producing the same
  • Article comprising microcapsules for on-demand adhesion and method for producing the same
  • Article comprising microcapsules for on-demand adhesion and method for producing the same

Examples

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Embodiment

[0146] Objects and advantages of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention. These examples are for illustrative purposes only and are not intended to limit the scope of the appended claims.

[0147] Material

[0148] All parts, percentages, ratios, etc. in the examples, as well as in the remainder of this specification, are by weight unless otherwise indicated. All chemicals were purchased or available from chemical suppliers such as Sigma-Aldrich Chemical Company, St. Louis, MO, unless otherwise noted.

[0149] Table 1.

[0150]

[0151]

[0152] Test Methods

[0153] Compression Test Method

[0154] Materials for compression testing were cut into 4 inch by 4 inch (10 centimeters (cm) by 10 cm) specimens. The sheet was then placed on a Sintech load frame (from MTS ...

preparation Embodiment 1

[0165] Preparation Example 1 - Microcapsules with Solvent and Plasticizer

[0166] A 600 milliliter (mL) glass beaker was charged with 200 grams (g) of deionized water and 50 g of a 2.5 wt. % aqueous solution of ethylene maleic anhydride copolymer. The beaker was placed in a water bath with an overhead mixer and the stirring rate was set between 1200 revolutions per minute (RPM) and 1500 revolutions per minute. Urea (5 g), ammonium chloride (0.5 g) and resorcinol (0.5 g) were added to the water mixture. The pH was adjusted to 3.5 with sodium hydroxide, and then 60 g of a 9:1 xylene:plasticizer 261A mixture were added simultaneously to the agitated mixture. After waiting 10 minutes, the formalin solution (12.6 g) was added to the beaker. Cover the beaker with aluminum foil. The reaction was carried out at 55°C for 4 hours. After cooling, the capsules were washed with water and filtered under vacuum filtration. The microcapsules were then placed through a series of sieves...

preparation Embodiment 2

[0167] Preparation Example 2 - Microcapsules with Plasticizer 261A

[0168] A 600 mL glass beaker was charged with 200 g of deionized water and 50 g of a 2.5 wt. % aqueous solution of ethylene maleic anhydride copolymer. The beaker was placed in a water bath with an overhead mixer and the stirring rate was set between 1200 RPM and 1500 RPM. Urea (5 g), ammonium chloride (0.5 g) and resorcinol (0.5 g) were added to the water mixture. The pH was adjusted to 3.5 with sodium hydroxide, and then 60 g of a 9:1 xylene:plasticizer 261A mixture were added simultaneously to the agitated mixture. After waiting 10 minutes, formalin solution (12.6 g) was added to the beaker. Cover the beaker with aluminum foil. The reaction was carried out at 55°C for 4 hours. After cooling, the capsules were washed with water and filtered under vacuum filtration. The microcapsules were then placed through a series of sieves and the size fractions separated between sieves with 425 micron openings an...

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Abstract

The present invention provides articles comprising a substrate having a first major surface, the substrate comprising a nonwoven, woven, or foam. The article also includes microcapsules having an outer surface and a plasticizer encapsulated within the microcapsules, wherein a plurality of microcapsules are attached to the first major surface of the substrate with a polymeric material. The invention provides a method of making an article comprising providing a substrate having a first major surface and providing microcapsules having an outer surface and a plasticizer encapsulated within the microcapsules. The method also includes attaching the microcapsules to the first major surface of the substrate with a polymeric material, thereby forming a polymeric matrix attached to the first major surface of the substrate.

Description

technical field [0001] The present invention provides articles comprising microcapsules for on-demand adhesion, and methods of making the articles. Background technique [0002] Typically, the surfaces of pressure sensitive adhesives (PSAs) are protected by release liners or adhesive-backed backings to prevent them from sticking to undesired substrates prior to application. For some applications, it is desirable to avoid the use of these liners and backings. For example, in some cases the liner adds significant cost to the product, but the liner is discarded before the adhesive is applied, so the cost adds no direct value to the product and removing the liner would provide a significant cost savings. In other cases, the use of liners causes technical problems. For example, when the adhesive is on a fragile backing such as a nonwoven insulation, the force required to remove the liner from the adhesive can damage the backing. For industrial applications, the operator often ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M23/12B01J13/02C09J7/21C08K9/10
CPCC08K9/10C08K2201/013B01J13/16D06M23/12C08J9/365C08J2375/04C09D133/02
Inventor J·D·鲁尔M·M·卡鲁索戴利A·N·德罗维尔郄丽丽
Owner 3M INNOVATIVE PROPERTIES CO