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polymer multilayer film

A polymer film, polymer layer technology, applied in the direction of synthetic resin layered products, layered products, pressure-sensitive films/sheets, etc.

Active Publication Date: 2021-07-16
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique requires additional processing steps and requires patterned rolls to be fabricated and used for each desired final texture or structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] use as image 3 and 3A The apparatus shown (with the difference that there are only seven stacked mold trays) uses a seven-layer annular stacked mold (under the trade designation "COEX 7-LAYER" (type LF-400) from LabTech, Samut Pragan, Thailand. engineering company) to prepare a seven-layer film. Airflow to the mold was manually controlled to achieve a blow-up ratio of approximately 2:1. The bubble then collapses and rolls up about 3 meters (10 feet) above the mold. Feed material was provided by seven separate 20mm diameter extruders with a length to diameter ratio of approximately 30:1.

[0112] A first extruder was used to melt low density polyethylene (obtained under the trade designation "PETROTHENE NA217000 5.6 MFI" from LyondellBasell, Houston, TX) and extrude it into an annular In the inner channel of the stacking mould. The melting temperature was maintained at 180°C. The same resin was fed into subsequent outer layers of the first resin using the second, ...

Embodiment 2

[0115] Polymer multilayer films were prepared as described in Example 1, except that the first, second, third, fourth, and fifth extruders contained only low-density polyethylene, and the remaining extruders contained the described A blend of chemical blowing agents and pressure sensitive adhesives. A melt temperature of 215°C was maintained for the two layers containing the chemical blowing agent. A mold temperature of 180°C was maintained.

[0116] Images of the resulting polymer multilayer films are shown in Figure 5 and 5A middle.

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Abstract

The present invention provides a polymeric multilayer film comprising a layer comprising a first pressure sensitive adhesive and exhibiting a random network of strands and connected regions. The polymeric multilayer films are useful, for example, in tapes and graphic articles.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application 62 / 432,392, filed December 9, 2016, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] It is desirable to prepare polymeric films and film composites with structures and / or textures that provide additional functionality. Such functionality may include optical effects, and / or increased liquid absorption or solid retention due to the increased surface area of ​​a textured surface relative to a smooth surface. [0004] Texture or structure can be added to the polymer film, for example, via casting molten polymer onto a patterned chill roll. This requires the use of specific patterned rolls for each desired textured or structured film. Alternatively, the non-patterned polymeric film can be embossed after the film preparation process by reheating at least a portion of the film surface and passi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/12B32B5/02B32B5/26B32B7/06B32B7/12B32B27/08C09J7/20B32B27/32B32B27/36
CPCB29D2009/00B32B5/02B32B5/26B32B7/06B32B7/12B32B27/08B32B27/32B32B27/36B32B2250/242B32B2262/023B32B2262/0292B32B2307/51B32B2307/724B32B2405/00C09J7/38B32B33/00B29C39/123C09J2301/204C09J7/20B29C48/21B29C48/0018B29K2023/0633B29K2105/0097B32B2262/0253C09J2301/408Y10T428/14
Inventor 杰弗里·O·艾姆斯兰德雅各布·D·扬克里斯托弗·J·罗特尔
Owner 3M INNOVATIVE PROPERTIES CO
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