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Isolation structure and method of making the same

An isolation structure, fluoropolymer layer technology, applied in chemical instruments and methods, synthetic resin layered products, packaging, etc., can solve problems such as expensive, difficult and limited fluoropolymer adhesion

Inactive Publication Date: 2011-11-30
SAINT GOBAIN PERFORMANCE PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These multilayer articles are typically expensive because they are limited to high melting temperature substrates
There has been considerable difficulty commercially adhering fluoropolymers to often more cost-effective, low-melting temperature substrates

Method used

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  • Isolation structure and method of making the same
  • Isolation structure and method of making the same
  • Isolation structure and method of making the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] An exemplary isolation structure was fabricated. The fluoropolymer layer was an approximately 1.0 mil film available from Saint Gobain, similar to product DF1700DB. Both sides of the fluoropolymer layer were C-treated. On both the first major surface and the second major surface of the fluoropolymer, there was an adhesive layer of an isocyanate adhesive film about 1.0 mil thick. A reinforcement layer (approximately 3.0 mils thick) of flame retardant weft-inserted warp knit polyester was placed over an adhesive layer. There is a polymer layer of ready-made PVC on top of the reinforcement and adhesive layers.

[0048] Some of the key mechanical properties required by NFPA 1991 (chemical permeability, burst strength, hole tear propagation, seam strength, and flame resistance) of the insulation structure were tested and easily qualified. The results can be seen in Table 1.

[0049] Table 1

[0050] test

[0051] The properties of the fluoropolymer and the ch...

example 2

[0053] An exemplary isolation structure was fabricated. The fluoropolymer layer was a 1.0 (nominal) mil (0.0010 inch) film, product DF1700DB, available from Saint Gobain. The fluoropolymer layer is C-treated. The adhesive layer was a polyurethane melt adhesive film (Bemis 3206) having a thickness of 2 mils. The polymer layer is ready-made PVC with a clear, glossy finish.

[0054] This combination was combined in a press at about 50 psi for 60 seconds. To obtain durable bond strengths between the fluoropolymer and the adhesive that exceed the yield strength of the fluoropolymer film, the adhesive layer can be heated to approximately 300°F for the FEP side and approximately 350°F for the PFA side. side). (The yield strength of the fluoropolymer film is about 2.0 lb / inch, so the fluoropolymer is irreversibly stretched to a large extent or is torn when peeled.) Good adhesion to PVC was observed from 250°F . Lamination can be done in one step since PVC does not appear to melt...

example 3

[0056] An isolation structure was fabricated using the conditions in Example 2 with the following changes. "ST-3477 Polyurethane" is the polymer layer (obtained from Stevens Urethane), the Bemis 3206 adhesive was first bonded to the DF1700DB as above, and then in a separate step at lower temperature and pressure (25 psi) the The polyurethane polymer layer is laminated on the adhesive. Heating at a temperature of 300°F and partial melting of the polyurethane produced a good bond.

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PUM

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Abstract

The disclosure is directed to a barrier structure including a fluoropolymer layer and a polymeric layer. The barrier structure has a chemical permeation breakthrough detection time greater than about one hour for hazardous chemicals as measured by ASTM F739. The disclosure is further directed to a method of forming the aforementioned barrier structure. The barrier material is designed to be suitable for construction of shelters, clothing, containers and other articles requiring barrier properties.

Description

technical field [0001] The present disclosure generally relates to isolation structures and methods for making such structures, as well as articles fabricated from these isolation structures and methods for producing such articles. Background technique [0002] Low surface energy polymers such as fluoropolymers exhibit good chemical barrier properties, exhibit resistance to damage from exposure to chemicals, are resistant to staining, exhibit Resistance to damage from exposure to environmental conditions and typically forms a release surface. While there is a demand for such low surface energy polymers, these polymers tend to be expensive. Furthermore, such polymers exhibit low wetting characteristics and adhesion to other polymeric substrates is poor due to their tendency to form release surfaces. [0003] For specific multi-layer article applications, manufacturers have turned to high-temperature processing and high-temperature seams. For example, temperatures in excess...

Claims

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Application Information

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IPC IPC(8): B32B27/08
CPCB32B7/12B32B27/30B32B2327/12B29C65/04B32B2307/714B32B33/00B32B37/12B29C65/50B29K2027/12B29C65/4815B29K2995/0069B32B2310/14B29C66/91411B29C65/4845B29C65/5021B29C66/919B29L2009/00B29C66/91921B29C65/482B32B2309/105B32B2309/02B32B27/36B29C65/62B29C65/10B29C65/02B32B38/0008B32B27/40B32B2307/3065B29C65/4835B29K2101/12B29C66/91931B32B27/08B29C66/7212B32B27/16B32B27/20B32B27/304B32B27/322B32B2255/26B32B2262/02B32B2270/00B32B2307/402B32B2307/554B32B2307/5825B32B2437/00B32B2439/00B29C66/7392B29C66/73921B29C66/7394B29C66/71B29C66/712B29C66/72341B29C66/72343Y10T428/192Y10T156/10Y10T428/31855Y10T428/8305Y10T428/3154Y10T428/31544B29K2309/08B29K2277/10B29K2075/00B29K2027/16B29K2027/06B29K2027/18B32B37/02B29C65/00
Inventor P·A·科克二世R·A·詹姆克R·G·伯利顿J·G·道尼
Owner SAINT GOBAIN PERFORMANCE PLASTICS CORP
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