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Ready to use PA6,66 copolymer for manufacturing articles with good transparency and softness

IP.com Disclosure Number: IPCOM000249257D
Publication Date: 2017-Feb-14
Document File: 3 page(s) / 138K

Publishing Venue

The IP.com Prior Art Database

Abstract

Many products can be made of melt spun or extruded polyamides, such as for example, fibers, filaments for fishnets or fishing lines, carpet fibers, etc. These end products have certain desirable transparency, softness, and tenacity characteristics based on their applications. Previous methods of producing such products, e.g., by blending or other methods, are either too expensive, difficult to execute, or the resultant products lack the desired physical characteristics. A ready-to-use (RTU) grade copolymer provides a blend with low oligomer content such that the copolymer has the desirable physical properties. Further, the RTU grade copolymer requires little or no further compounding by the product manufacturer prior to melt spinning or extrusion, and therefore is easy to use and mitigates against potential variability in the properties of the polyamide products formed.

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Ready to use PA6,66 copolymer for manufacturing articles with good transparency and softness

Abstract

Many products can be made of melt spun or extruded polyamides, such as for example, fibers, filaments for fishnets or fishing lines, carpet fibers, etc.  These end products have certain desirable transparency, softness, and tenacity characteristics based on their applications.  Previous methods of producing such products, e.g., by blending or other methods, are either too expensive, difficult to execute, or the resultant products lack the desired physical characteristics.  A ready-to-use (RTU) grade copolymer provides a blend with low oligomer content such that the copolymer has the desirable physical properties.  Further, the RTU grade copolymer requires little or no further compounding by the product manufacturer prior to melt spinning or extrusion, and therefore is easy to use and mitigates against potential variability in the properties of the polyamide products formed. 

Background

In many polyamide applications, the use of polyamide 6 (PA6) may not be desirable because the PA6 filament does not exhibit desirable transparency and softness properties.  Similarly, it is difficult to use high polyamide 6,6 (PA66) content polyamide 6, 66 (PA6,66) copolymer for these applications despite its improved softness and transparency properties because using high PA66 content PA6,66 copolymer is more expensive than using PA6.  As such, to improve the transparency and softness, most manufacturers use the following method shown in Fig. 1 below:

           

Disadvantageously, this method requires blending numerous components upstream of final processing, including PA6, PA6,66 copolymer, and potentially numerous additives, which may be difficult as time and labor required, may introduce a margin of error such as improper ratio blending, and may lead to inconsistencies in the properties of the final products. 

Concept

A ready-to-use (RTU) PA6, 66 copolymer product has been developed, which can be used directly in the final production of various applications, e.g. fibers, filaments for fishnets or fishing lines, carpet fibers, etc., while exhibiting improved transparency, softness, and tenacity properties. 

As shown in Figure 2 below, the RTU grade copolymer can be produced by mixing a batch mixture of PA6, 66 copolymer, optionally caprolactam, and one or more additives with incomplete leaching high oligomer content PA 6,66 copolymer.  The batch mixture can be produced by either compounding or melt spraying.

Also, as shown in Fig. 3 below, the RTU grade copolymer also can be made by producing a batch mixture of PA6, 66 copolymer, optionally caprolactam, and one or more additives via compounding, and then blending the batch mixture with the same PA6, 66 base resin.

Additionally, as shown in Fig....