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Thin film lamination-delamination process for fluoropolymers

A technology of film lamination and delamination, applied in lamination, lamination device, lamination auxiliary operation, etc., can solve problems such as limiting orientation degree

Inactive Publication Date: 2006-04-26
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As mentioned above, oriented fluoropolymer films are known to exhibit improved performance, but existing processing limitations also limit the degree of orientation that can be performed on unsupported fluoropolymer films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A bilayer fluoropolymer / polyolefin film was coextruded by a calendered film process. The extruded film contains sufficient antiblocking agent in the base layer and / or carrier layer to prevent blocking in roll form after extrusion. The average thickness of the fluoropolymer underlayer was about 0.3 mil (7.62 μm). The average thickness of the carrier film was about 2 mils (50 μm). The fluoropolymer membrane is a PCTFE homopolymer. The carrier film was low density polyethylene (LDPE) and no adhesive resin was used to adhere the two layers. To improve the adhesion of the PCTFE layer to the receiver sheet, the exposed side of the bottom layer was corona treated to produce a film with a minimum surface energy of 45 dynes as measured by a surface energy pen or by the water contact angle technique.

[0052] Apply a two-part polyurethane adhesive consisting of 100 parts epoxy / amine and 12 parts polyol / isocyanate to the exposed side of the fluoropolymer primer at a rate of 1.5...

Embodiment 2

[0057] Example 1 was repeated except that a coextruded carrier film containing a separate resin layer was prepared. The carrier film is a 0.2 mil (5 μm) tie layer (composed of ethylene-vinyl acetate blended with polyethylene) and a 1 mil (25 μm) layer of linear low density polyethylene ( A separate layer of LLDPE). The tie layer surface was in contact with 0.3 mil (7.62 μm) of PCTFE layer resin and the LLDPE layer. The interlayer adhesion between the tie layer and the fluoropolymer film is sufficiently weaker than the interlayer adhesion between the tie layer and the LLDPE layer that when separated on a slitter, the Separated from junction layer / LLDPE carrier film. The MVTR of the resulting laminate was 0.06 g / 100 inches 2 / day (0.93g / m 2 / sky).

Embodiment 3

[0059] Example 2 was repeated except that the second side of the fluoropolymer film was coated with the adhesive in Example 1, oven dried, and laminated directly to 0.7 mil (17.8 μm) clear PVC film . It was found that the carrier layer consisting of tie layer and LLDPE released easily from the first surface of the fluoropolymer film after lamination with the PVC film. The laminate has an MVTR of 0.06 g / 100 inches 2 / day (0.93g / m 2 / sky).

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PUM

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Abstract

This invention relates to a method of forming thin fluoropolymer films and receiver sheets into film laminates, and more particularly, this invention relates to methods of making very thin, transferable fluoropolymer films. A thin fluoropolymer underlayer is applied to a carrier layer, which may be a thicker film. The carrier layer / sublayer is then laminated to a receiver sheet, and the carrier layer is then peeled off, leaving the base film on the receiver sheet.

Description

Background of the invention [0001] field of invention [0002] This invention relates to film lamination of fluoropolymer films to polymer receiver sheets. More particularly, this invention relates to the production of very thin, transferable films of various fluoropolymers with improved thermal stability. [0003] Description of related fields [0004] It is well known in the art to produce monolayer and multilayer fluoropolymer films. See, eg, US Patents 4,677,017, 4,659,625, and 5,139,878. A number of fluoropolymer materials are generally known due to their excellent moisture and gas barrier properties and are therefore desirable components for packaging films, especially lidding films and blister packs. In some applications it is also desirable to orient the film to further enhance the properties of the film. For example, for push-through lids for pharmaceutical packaging, uniaxial orientation of the film is required in order to obtain a one-way push-through produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/02B32B7/12B32B27/08B32B37/12B32B37/15
CPCB32B27/08B32B37/025B32B37/12B32B37/153B32B38/18B32B2327/12B32B2553/00Y10T428/24959Y10T428/24967Y10T428/31504B32B7/12B32B27/304B32B27/32B32B27/322B32B43/006B32B2307/308B32B7/027
Inventor M·J·彻尔平斯基Y·P·R·婷J·D·穆尔顿
Owner HONEYWELL INT INC