Flame retarded fibers and filaments and process of production therefor

Inactive Publication Date: 2005-07-21
ALBEMARLE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] Polybrominated anionic styrenic polymers are compatible with, and provide flame retardancy to, fiber-forming thermoplastic polymers. Such flame retardants have lower viscosities and greater thermal stability than polybrominated non-anionic styrenic polymers, an advantage in processes such as melt blending and fiber spinning. Due to their compatibility with fiber-forming thermoplasti

Problems solved by technology

Although synthetic fiber materials possess a variety of excellent physical and chemical properties, a common drawback is their ready tendency to combustion, for which reason such synthetic fiber materials have traditionally been subjected to finishing treatment for flame retardancy.
An obvious disadvantage of coatings is that they can wear off over time.
Unfortunately, the use of flame retardant additives in synthetic fiber materials can result in undesirable color development or blooming.
In other words, such additives can detrimentally affect the color of the synthetic fiber.
In many applications, this color development problem is undesirable or unacceptable.
Furthermore, when blended with synthetic fiber materials, flame retardant additives tend to form nonuniform distributions in the mixture, and thus result in nonhomogeneous flame-retarded fibers, which have poor mechanical properties.
Specifically, if the f

Method used

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  • Flame retarded fibers and filaments and process of production therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102] In a melt spinning apparatus, dried polyethylene terephthalate is mixed with the desired amount of polybrominated anionic styrenic polymer at 280′-300° C., and the melt is extruded into a water bath as strands. The fibers obtained are woven to form a fabric. To evaluate flame retardancy, the fabric is subjected to the small-scale NFPA-701 test (1989), a standard test established by the National Fire Protection Association. In the NFPA-701 test, a 2 inch by 10 inch piece of cloth is stretched taut over a frame, and hung vertically. This piece of fabric is put three-fourths of an inch into a 1.5 inch flame for 12 seconds. The char length, drip burn, and weight loss of the fabric are measured. To pass the NFPA-701 test, a material should have a drip burn time of zero seconds.

example 2

[0103] In a melt spinning apparatus, the desired amount of polybrominated anionic styrenic polymer is added to a molten nylon (polyamide), and the melt is extruded to give fibers or filaments. The fibers or filaments are knitted to form a fabric. Flame retardancy is evaluated by subjecting the fabric to the NFPA-701 test as described in Example 1.

example 3

[0104] In a melt spinning apparatus, the desired amount of polybrominated anionic styrenic polymer is added to a molten polypropylene, and the melt is extruded to give fibers or filaments. The fibers or filaments are woven to form a fabric. To evaluate flame retardancy, the fabric is subjected to the NFPA-701 test as described in Example 1.

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Abstract

A fiber or filament which is formed from ingredients comprising (a) at least one fiber-forming thermoplastic polymer, and (b) at least one polybrominated anionic styrenic polymer is provided. The polybrominated anionic styrenic polymer has a bromine content of at least about 50 wt %. Processes for producing such fibers or filaments are also provided.

Description

TECHNICAL FIELD [0001] This invention relates to thermoplastic fibers and filaments, including those where the thermoplastic is a polyester, polyamide, polyolefin, or an acrylic, which are flame-retarded with a brominated styrenic polymer. BACKGROUND [0002] Although synthetic fiber materials possess a variety of excellent physical and chemical properties, a common drawback is their ready tendency to combustion, for which reason such synthetic fiber materials have traditionally been subjected to finishing treatment for flame retardancy. Examples of finishing treatment methods include dip coating and spray coating. An obvious disadvantage of coatings is that they can wear off over time. [0003] Unfortunately, the use of flame retardant additives in synthetic fiber materials can result in undesirable color development or blooming. In other words, such additives can detrimentally affect the color of the synthetic fiber. In many applications, this color development problem is undesirable ...

Claims

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Application Information

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IPC IPC(8): C08K3/00C08L23/10C08L25/18C08L67/02C08L77/00C08L77/02C08L77/06D01F1/07D01F6/06D01F6/46D01F6/48D01F6/60D01F6/62D01F6/90D01F6/92
CPCC08K3/0058C08L23/10D01F6/92D01F6/90D01F6/62D01F6/60D01F6/48D01F6/46D01F1/07C08L77/06C08L77/02C08L25/18C08L67/02C08L77/00C08L2666/06C08K3/016D01F6/06
Inventor REED, JON SHANNONDE SCHRYVER, DANIEL A.
Owner ALBEMARLE CORP
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