Methods for manufacturing silver multilayered films and the articles obtained therefrom

A multi-layer film and silver technology, applied in layered products, chemical instruments and methods, natural mineral layered products, etc., can solve problems such as high coating production costs, high investment costs, and environmental problems

Inactive Publication Date: 2006-07-05

SABIC INNOVATIVE PLASTICS IP BV

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AI-Extracted Technical Summary

Problems solved by technology

However, the development of coatings for surface decoration is generally considered expensive due to high investment costs for plant installation and maintenance and high associated coating...

Abstract

A silver multilayered film comprises at least one intermediate layer comprising a polymeric resin; a colorant composition and a flake composition, wherein the normal to the individual flakes are oriented at an average angle of about 0 to about 75 degrees with a normal to the multilayered film, and wherein the intermediate layer is located between a first layer and an second layer and further wherein the multilayered film has a lightness greater than or equal to about 60 and a change in lightness as a function of viewing angle of greater than or equal to about 40. A multilayered film comprises an intermediate layer disposed on and in intimate contact with a surface of a first layer and a second layer disposed on and intimate contact with a surface of the intermediate layer opposite the first layer, wherein the intermediate layer comprises a polymeric resin; a colorant composition and a flake composition, wherein the normal to the individual flakes are oriented at an average angle of about 0 to about 75 degrees with a normal to the multilayered film, and further wherein the multilayered film has a lightness greater than or equal to about 60 and a change of lightness as a function of viewing angle of greater than or equal to about 40.

Application Domain

Synthetic resin layered productsLamination +5

Technology Topic

PolyresinLightness +2

Image

Examples

Experimental program(3)
Comparison scheme(1)

Example Embodiment

[0121] Example 2

[0122] In this example, the aluminum flakes of Example 1 are "reinforced" by coating with a transparent ceramic (such as silicon oxide or aluminum oxide), making them hard enough to maintain their aspect ratio during the melting process. The reinforced sheet is available from Flex Products Inc. and is coated by vacuum deposition. These reinforced aluminum flakes were operated in polycarbonate in the same manner as in Comparative Example 1. Brightness (L * ) And the brightness change (ΔL * ) Are shown in Figure 7(a) and (b) respectively. In Figures 7(a) and (b), it can be seen that the behavior of the reinforced alumina mimics the behavior of the test article painted with silver, which is closer than the non-reinforced aluminum flake used in Example 1. Figures 8 (a) and (b) are through electron micrographs, showing that the reinforced aluminum flakes did not suffer the same damage as the unreinforced aluminum flakes.

Example Embodiment

[0123] Example 3

[0124] In this embodiment, 5.4 wt% mica flakes, 0.6 wt% aluminum flakes, and 0.01 wt% carbon black coated with titanium dioxide are added to the intermediate layer instead of the aluminum flakes. All three layers, that is to say the inner layer, the middle layer and the second layer are made of polycarbonate. The three layers were co-extruded in a similar manner to Example 1. The first layer of this embodiment contains 1 wt% of mica flakes coated with titanium dioxide and 0.01 wt% of carbon black.

[0125] Brightness (L * ) And the brightness change (ΔL * ) Are shown in Figure 9(a) and (b) respectively. According to these curves, it can be seen that the sample containing titanium dioxide-enhanced mica gives brightness (L * ) And the brightness change (ΔL * ), which is closer to silver paint than unreinforced aluminum flakes. This again shows that the retention of the aspect ratio and the resulting orientation of the flakes in the intermediate layer promote the development of the silver coloration in the multilayer painting film.

[0126] The native layer morphology of mica usually means that the pigment can protect their flat morphology. After extrusion, it is shown in the electron micrographs of Figure 10 (a) and (b). The result of aspect ratio retention is that strong brightness changes as a function of the viewing angle can be expected from these types of flakes. However, in this example, it is generally desirable to obtain a suitable brightness to match the display of silver metal. Because of the interference of light that occurs in the titanium dioxide-coated mica flakes, the flakes show different colors. In order to obtain a white color from these flakes, it is usually desirable to mix flake groups with coatings of different thicknesses to obtain a macroscopic white color in the film. The weight% of the different flake groups mixed in to obtain the macroscopic white color can be determined by the following additive color mixture rule. Three colors of flakes-red, blue and green-are used, each in an amount of 33% by weight, where the weight% is based on the total amount of the flake composition.

Example Embodiment

[0127] Example 4

[0128] In this embodiment, the middle layer contains 1% by weight of mica flakes coated with titanium dioxide, and is placed on the first layer, which also contains mica flakes coated with titanium dioxide. Both layers contain a small amount of about 0.001 wt% carbon black, where the wt% is based on the total weight of the layer. Since the titanium dioxide coated flakes in the intermediate layer allow a considerable amount of incident light to pass through the intermediate layer, it is generally desirable to minimize the amount of transmitted light and maximize the amount of reflected light. One possible way to achieve this is to apply the first layer, which can promote an increase in the amount of reflected light based on the incident light on the film. In order to increase the reflection of incident light, the first layer contains mica flakes coated with titanium dioxide and carbon black. Brightness (L * ) And the brightness change (ΔL * ) Are shown in Figure 11(a) and (b) respectively. According to these graphical curves, you can see the brightness (L * ) And brightness change (ΔL * ) Are almost similar to the silver painted samples.

[0129] These tests clearly indicate that the aspect ratio needs to be preserved in the flakes and the flakes need to be oriented in the machine direction (ie, the direction of film extrusion). Furthermore, in order to obtain a silver multilayer film, it is generally desirable to use a first layer and an intermediate layer having oriented flakes and containing carbon black.

PUM

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