Dimensionally stable multi-layer polyester films

A technology of aromatic polyester and polyolefin, applied in the direction of layered products, synthetic resin layered products, and other household appliances, can solve problems such as contradictions, and achieve the effect of high resistance to layering and excellent film quality

Inactive Publication Date: 2014-03-19
DUPONT TEIJIN FILMS U S LLP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these mechanisms are often unique to each system and do not translate any general understanding into predicting the effectiveness of tie layer materials
Attempts have been made to apply knowledge derived from polymeric compatibilizers that perform relevant functions in polymer blends by modifying the mutual incompatibility of dissimilar polymer systems in a mixing environment, But there is conflicting evidence in the literature on the whole

Method used

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  • Dimensionally stable multi-layer polyester films
  • Dimensionally stable multi-layer polyester films
  • Dimensionally stable multi-layer polyester films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Films comprising two layers were extruded and cast using a standard melt coextrusion system. The coextrusion system was assembled utilizing two independently operated extruders that fed separate supplies of polymer melt to standard coextrusion blocks or junctions where these streams were connected. Thereafter, the melt is transferred to a simple, flat film extrusion die that allows the melt curtain to be cast and quenched at temperature on a rotating, cold metal cylinder. The first layer comprised PET polyester 1, which was extruded and cast from a common die at a set processing temperature of 275°C. The second coextruded layer comprises material Bynel 21E533 (a similar grade Bynel 21E830 can be used). The Bynel material was processed at an extruder temperature of 260°C and finally cast from a coextrusion die at 275°C. The cast film was collected at a processing speed of about 1.8 m / min and had a width of about 150 mm. The total thickness of the film was about 550 μm...

Embodiment 2 to 10

[0144] In each of these examples, membranes were fabricated as described in Example 1, except that the material Bynel 21E533 was replaced by the following: Bynel 41E865; Bynel 3861; Lotader AX8900; Lotader 3210; Lotader 4210; Kraton FG1901X; Kraton 1924X; Admer SE810. Lotader grades are supplied by Arkema Chemicals. Kraton grades are supplied by Kraton Polymers. Bynel and Nucrel grades are supplied by E.I. DuPont de Nemours. Admer grades are supplied by Mitsubishi Chemical Company.

Embodiment 11

[0146] Films were fabricated as described in Example 1 except that the aromatic polyester was replaced by PEN Polyester 2. The PEN material was extruded and cast from a common die at a set process temperature of 285°C. A second coextruded layer of Bynel 21E533 was processed at an extruder temperature of 260°C and finally cast from a coextrusion die at 285°C. The cast film was collected under similar conditions as in Example 1 and had similar dimensions, ie a total thickness of 550 μm with a PEN layer of about 400 μm and a Bynel adhesive layer of about 150 μm.

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Abstract

A multi-layer biaxially oriented film comprising a first layer (A) comprising an aromatic polyester (a) and a second layer (B) comprising a polyolefin (b) having a melting point of from 230 to 290 DEG C wherein said polyolefin is a styrene polymer, and an adhesive interlayer (C) between a layer (A) and a layer (B), wherein said adhesive interlayer (C) comprises a tie-layer material (c) selected from anhydride-modified ethylene copolymers in which the proportion of anhydride present in the copolymer is no more than 3.0 % by weight of the polymer, and in which the ethylene copolymer comprises one or more additional comonomers other than styrene.

Description

technical field [0001] The present invention relates to biaxially oriented multilayer films exhibiting excellent dimensional stability under varying conditions of humidity and temperature and high mechanical integrity. Background technique [0002] Applications where these properties are important include flexible electronics, flexible displays, and magnetic recording. In each case, the substrate or substrate on which the microcircuits are built or the supporting magnetic recording layer must possess excellent dimensional stability, respectively, to provide reliable recording of microelectronic features when applied in successive stages during fabrication, or Used to allow the narrow but stable track pitch required for higher capacity in data storage. [0003] It has been reported that for biaxial polymer films, resistance to temperature changes (e.g., coefficient of thermal expansion, CTE) and ambient humidity changes (e.g., humidity expansion coefficient) can be achieved ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36
CPCB32B2250/05B32B27/32B32B27/302B32B7/02B32B2250/03B32B2307/538B32B2429/00B32B7/12B32B2307/734B32B2457/20B32B27/36B32B2250/40B32B2307/54B32B2307/518B32B27/08Y10T428/269Y10T428/24959Y10T428/24942Y10T428/31797
Inventor 邓肯·亨利·麦克尔罗恩石田刚约翰·弗朗西斯莫里斯·基兰·卢尼
Owner DUPONT TEIJIN FILMS U S LLP
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