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Adhesive layer composition for in-mold decoration

a technology of in-mold decoration and composition, which is applied in the direction of film/foil adhesives without carriers, film/foil adhesives, other domestic articles, etc., can solve the problems of contamination of the production environment, inability to cleanly separate the durable layer from the release layer, and the current availability of decoration tape or strip, etc., to achieve high transmission, high blocking resistance, and efficient propagation

Inactive Publication Date: 2006-01-26
WANG XIAOJIA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] The adhesive layer of the present invention provides desirable fracture properties and as a result, cracking at the edges of the object during the transfer process such as injection molding, may be initiated and propagated efficiently during the injection molding process and the subsequent mold-part separation process. This feature enables a clean separation of the decoration or functional layer from the carrier substrate at the edges of the object, particularly at the edges of a hollow structure.
[0019] In addition, the adhesive layer of the present invention also provides high degree of transmission, high blocking resistance, high hardness and sufficient adhesion, even for complicated three-dimensional objects.

Problems solved by technology

However, the currently available decoration tape or strip has many disadvantages.
For example, when the carrier and release layers are removed, the durable layer cannot be cleanly separated from the release layer, especially at the edges of the molded object.
As a result, fragments of the residual durable layer inevitably generate debris which not only causes contamination to the production environment but also reduces the production yield.
This problem is even more pronounced when the molded object has a small hollow structure, such as a speaker and ear pieces of a cell phone cover.
The problem is most likely caused by poor fracture characteristics of the decoration tape or strip and / or the inappropriate balance between the cohesion strength of the durable and adhesive layers and the adhesion strength at the interface between, such as the durable and release layers, the durable and ink layers, the durable and metal layers, the adhesive and metal layers, the durable and adhesive layers and / or the adhesive layer and the molding plastic material.

Method used

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  • Adhesive layer composition for in-mold decoration
  • Adhesive layer composition for in-mold decoration

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065] A release fluid was prepared first by mixing 2.10 gm of MF370 (methylated melamine resin, Cytec Industries) with 1.41 gm of ethylene glycol dimethyl ether (Aldrich) and 0.63 gm of DI water using a magnetic stirrer, after which 0.6 gm of 2,2′-dihydroxy-4-methoxybenzophenone (Aldrich), 0.06 gm of Silwet L7230 / SL7607 (3 / 1 weight ratio, from Osi Specialties, Inc.) and 0.2 gm of Cycat 4040 (p-toluene sulfonic acid, from Cytec Industry) were added with agitation to ensure a homogeneous solution. This release fluid was then coated on a 1.5 mil PET film (PT1 from Mitsubishi Interfilm Holding, Inc., Easley, S.C.) with a #6.5 rod and a target dry coating thickness of 1.5 um. The coating was then placed in a 120° C. oven for 5 minutes to form a release coating.

[0066] A durable layer composition consisting of 7.67 gm (15% in MEK) of CAB-553-0.4 (cellulose acetate butyrate, from Eastman Chemical Co.), 2.94 gm (50% in MEK) of Ebecryl 1290 (aliphatic polyurethane acrylate, UCB Chemicals), ...

example 2

Comparative Example

[0071] 8.154 Grams of AquaPress ME and 7.74 gm of DI water were mixed together. The resulting mixture was coated onto the durable layer prepared in Example 1 and dried in an 80° C. oven for 10 minutes. The film sample was then tested using a direct injection molding method with PMMA resin ZKM (from CYRO Industries) at 480° F.

TABLE 1Trans-Film Blocking atAd-Lens Edgeparency of40° C. / 90%hesionCleannessthe LensRH & 60 HoursExample 1goodexcellentexcellentpassExample 2good90% filmexcellentfail(Comparativeremaining withExample)the lens

examples 3-5

The Use of Organic Particles with Different Tgs

[0072] In these examples, the pH values of all the materials used were pre-adjusted to 8.5 prior to mixing.

[0073] 1.303 Grams of S-2725 (water borne polyurethane) of a 19% solid content (from Neveon), 4.523 gm of AquaPress ME of a 39% solid content (from Proell Inc) and 7.0 gm of DI water were mixed together. To this mixture, 0.84 gm of S-50 (silica nanoparticles) of a solid content of 29% (from Nissan Chemical Houston Corporation) was added, followed by adding 1.15 gm of B-85 (non-crosslinking acrylic emulsion) of a 31.3% solid content (Tg=73° C., Rohm & Haas) with agitation (in Example 3). In Example 4, 1.125 gm of NeoCryl A-6015 (acrylic emulsion) of a 32% solid content (Tg=63° C., NeoResins) was added. In Example 5, 0.818 gm of CL-106 (acrylic resin) of a 44% solid content (Tg=46° C., Rohm & Haas) was added. An additional 0.184 gm, 0.209 gm and 0.516 gm of water were added into Formulations of Example 3, Example 4 and Example 5, r...

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Abstract

This invention relates to compositions suitable for the formation of an adhesive layer used for in-mold decoration.

Description

[0001] This application claims the priorities under 35 USC 119(e) of U.S. Provisional Application No. 60 / 589,708 filed on Jul. 20, 2004. The whole content of the priority application is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] This invention relates to compositions suitable for the formation of an adhesive layer used for in-mold decoration. BACKGROUND OF THE INVENTION [0003] In-mold decoration processes involve decorating objects as they are formed, in mold, of a heated plastic material being injected into a mold cavity. Usually a tape or strip of a decorating or protective material is automatically or manually advanced, pre-fed and positioned in the mold cavity at each molding cycle, interfacing therein with the plastic material as it is filled into the mold cavity, under heat and pressure. As the object is formed, the decorating material forms on the surface of the object and becomes an integral and permanent part of the object, through therma...

Claims

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Application Information

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IPC IPC(8): B32B5/16
CPCB29C45/14811Y10T428/252B29K2995/002B29L2031/3437C09J7/00C09J11/04C09J11/08C09J2205/11Y10T428/259Y10T428/2896Y10T428/10Y10T428/1059Y10T428/2878Y10T428/25Y10T428/2891Y10T428/2852Y10T428/254B29K2715/006C09J7/10C09J2301/412C09K2323/00C09K2323/05Y10T428/249921Y10T428/31507Y10T428/31551Y10T428/31554Y10T428/31562Y10T428/31565Y10T428/31573Y10T428/31598Y10T428/31663Y10T428/31721Y10T428/31725Y10T428/31736Y10T428/3175Y10T428/31786Y10T428/31797Y10T428/31801
Inventor WANG, XIAOJIAPERERIA, CHERIWANG, PEI-LINCHEN, JING-DENLIANG, RONG-CHANG
Owner WANG XIAOJIA
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