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Stabilization of fluorescent dyes in vinyl articles using hindered amine light stabilizers

a technology of amine light stabilizer and vinyl article, which is applied in the field of polyvinyl chloride articles, can solve the problems of polyvinyl chloride matrix degradation and the prediction of durable fluorescent-colored articles, and achieve the effects of reducing solvent use, reducing solvent emissions into the atmosphere, and eliminating solvent us

Inactive Publication Date: 2005-09-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new way to make colored articles that have durable fluorescent properties in a solventless PVC host matrix. By using a particular class of HALS to stabilize a class of fluorescent dyes, the article exhibits superior stability and can be used in many applications, including clothing, traffic control signs, and water flotation safety devices. The article is made by combining a polymeric matrix, a thioxanthene fluorescent dye, and a hindered amine light stabilizer. The use of substantially solventless PVC and HALS provides benefits unsuggested in the art for forming durable fluorescent-colored, PVC articles. The article retains its color and is able to fluoresce for a longer time period than is normally expected even when exposed to direct sunlight. The invention is also good for the environment because it eliminates solvent emissions into the atmosphere and reduces manufacturing costs by totally eliminating solvent use.

Problems solved by technology

Because processing of a substantially solventless polyvinylchloride resin subjects the resin to high temperatures, it was not predicted that a durable fluorescent-colored article would result.
As indicated above, amines can induce dehydrochlorination of the polyvinyl chloride at high temperatures, which can lead to degradation of the polyvinyl chloride matrix.

Method used

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  • Stabilization of fluorescent dyes in vinyl articles using hindered amine light stabilizers
  • Stabilization of fluorescent dyes in vinyl articles using hindered amine light stabilizers
  • Stabilization of fluorescent dyes in vinyl articles using hindered amine light stabilizers

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0079] A polyvinyl chloride film having a thickness of about 0.089 mm (0.0035 inch) to about 0.11 mm (0.0045 inch) was made as follows. PVC resin (formulation S00354 containing UV absorbers from Alpha Chemical and Plastics Corp.) was mixed with about 0.2% SO63 fluorescent dye and about 0.5% of the T-770 HALS. The resin / dye / HALS mixture was tumbled mixed. It was then extruded into a substantially flat film using a single screw extruder with 5 heating zones set at about 175, 205, 205, 175 and 175° C. and the film die set at about 180° C. The extruder was a three-quarters (¾) inch single screw Brabender extruder with polished chrome rolls.

[0080] The sample was subjected to 100 hours of weathering, and the data are reported in Tables 1 and 2.

[0081] Examples 2 and 3, and Comparative Examples A to E are all made according to Example 1 with different HALS used or no HALS used as described in Table 1. The samples were subjected to 100 hours of accelerated weathering, and the data are repo...

example 7

[0086] A polyvinyl chloride film was made using a pilot scale calendering process as follows. A powder of PVC was mixed with about 0.2% SY98 fluorescent dye and about 0.5% T-770 HALS. Other additives, for example UV absorbers, heat stabilizers, plasticizers, lubricants, and fillers were added either for processing aid or to help make a flexible PVC film. The mixture was fed through a strainer to remove metal, if present. The mixture was continuously mixed to form a fused mass, milled, and fed through rolls, all heated at about 177° C. (350° F.), to form the inventive film about 0.13 mm to about 0.15 mm (0.005 to 0.006 inch) thick. The sample was subjected to 400 hours of accelerated weathering and the data are reported in Table 3 below.

Comparative O

[0087] A calendered PVC film was made according to Example 7 except that no HALS was added to the PVC powder. The sample was subjected to 400 hours of accelerated weathering, and the data are reported in Table 3.

TABLE 3CALENDERED PVC...

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Abstract

A durable colored article having fluorescent properties comprises a substantially solventless polyvinyl chloride matrix, a thioxanthene fluorescent dye, and a secondary or tertiary hindered amine light stabilizer having a molecular weight less than about 1000 grams / mole. The invention has the advantage in that it provides a flexible polyvinyl chloride film that exhibits durable fluorescent colors.

Description

TECHNICAL FIELD [0001] The present invention pertains to polyvinyl chloride articles that exhibit durable fluorescent colors through the use of selected hindered amine light stabilizers. BACKGROUND [0002] Articles containing colorants lose their color when exposed to solar radiation for extended time periods. For example, articles placed outdoors throughout the summer often tend to display a faded version of their original color by the time autumn arrives. Although this fading occurs in both conventional and fluorescent colorants, the problem is more acute with fluorescent colorants. [0003] The life of fluorescent colored articles is typically in the range of months when exposed to daily solar radiation, whereas the life of articles that use conventional colorants can be in the range of years. Although generally less stable, fluorescent colorants nonetheless find frequent use because of their ability to increase an article's visibility. Unlike conventional colorants, fluorescent col...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B3/00B44F1/04C08F2/46C08K5/3435C08L27/06C09B57/14C09B67/00C09B67/02C09B67/18G02B5/124G02B5/128
CPCB32B3/30Y10T428/24612B32B27/20B32B27/30B32B27/304B32B2250/02B32B2250/246B32B2307/4026B32B2307/416B32B2307/42B32B2307/422B32B2590/00B44F1/04B44F1/08C08K5/0008C09B57/14C09B67/002C09B67/0097G02B5/124G02B5/128B32B27/08Y10T428/24479Y10T428/25Y10T428/24198Y10T428/2996Y10T428/252C08L27/06Y10T428/31699Y10T428/3192Y10T428/31928Y10T428/31935Y10T442/676
Inventor WHITE, KENNETH M.PAVELKA, LEE A.LIGHTLE, VERA L.CODERRE, JAMES C.
Owner 3M INNOVATIVE PROPERTIES CO
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