 Method for preparing high resolution wash-off images |
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| Use of solids as antiblocking additives for marker liquids |
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| Radiation-sensitive mixture and use thereof |
| We claim: 1. A radiation-sensitive mixture which is suitable for preparing a polyamide, a ... |
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| Hot melt inks for continuous jet printing |
| OF PREFERRED EMBODIMENTS Electrolyte The electrolyte used in the present invention is an inorganic ... |
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| OF THE INVENTION The invention pertains to an improved thermoset adhesive composition comprising a ... |
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| Line width control in a radiation sensitive polyimide |
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| Bleachable antihalation system |
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| Image recording ink |
| OF THE INVENTION The ink composition of the present invention comprises water and a coloring ... |
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Method for imparting improved discoloration resistance to articles
| Details |
Inventors: Kletecka, George;
Assignee: The B. F. Goodrich Company (Akron, OH)
Primary Examiner: Tentoni; Leo B.
Assistant Examiner:
Attorney, Agent or Firm: Lobo; Alfred D.
Excellent color stabilization as well as integrity is obtained in thin film and fibers exposed to bright sunlight at relatively high temperature, in polyolefin (PO) articles pigmented with blue and green phthalocyanine, and red azo and disazo pigments. The pigment is combined with two `large molecule` primary stabilizers, the first a piperidyl-based (PDYL) hindered amine light stabilizer (HALS), and the second, a 3,5-disubstituted-tert-butyl-4-hydroxybenzoate (3,5-DHBZ). The first contains at least two polysubstituted piperidyl rings in its molecule; the second is a hindered phenol with an ester group in the para- position. Stabilization of the PO's color is obtained for as long as the PO articles themselves are stabilized by the combination of primary stabilizers, typically, their useful life. With the combination, the pigmented articles are not only thermooxidatively and light-stabilized, but there is exceptionally low color fade. Because fibers may be extruded twice for better distribution of pigment, a small amount, no more than 0.1 phr of secondary melt-stabilizers, may be used. Blue-green- and red-pigmented PO articles exhibit less than a .+-.3 change in color (color fading) due to degradation of the pigment, over a period of exposure resulting in absorption of 1240 Kjoules/m.sup.2. Such exposure of pigmented articles, deemed equivalent to normal outdoor use over a period of more than 10 years, results in essentially no visible loss of color due to degradation of the pigment. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS This invention is particularly directed to stabilization of phthalocyanine and azo-pigmented PO fibers, particularly PP fibers used in fabrics for automobile seats, carpets, dashboards, and rear decks; for clothing; for drapes, and indoor and outdoor carpeting.
All such articles informal use may be exposed to sunlight, and typically are.
The temperature inside a modern car with much glass (to reduce weight) and windows up, can reach 90.
degree.
C.
(hence the GM test with a black panel temperature of 89.
degree.
C.
).
Hence the commercial need for stabilized pigmented PP and PE articles (see "Growing Trends in Automotive Textiles" by G.
Robert Turner Textile Chemist and Colorist 17-18 Vol 20, No.
6, 988; "New Phillips Fiber for Automotive Market Stands Up to UV Rays".
N/W Staff Report Nonwovens World pg 45-46, January 1989; "The Degradation of Automotive Upholstery Fabrics by Light and Heat" by Brian Milligan, pg 1-7 Rev.
Prog.
Coloration Vol 16, 1986).
In a particular embodiment, this invention provides an article made from a woven or non-woven fabric of phthalocyanine and azo-pigmented PP fibers.
Woven fabrics are produced from yarn by any one of several weaving techniques.
Non-woven fabric of PP may have a carded fiber structure or comprise a mat in which the fibers or filaments are distributed in random array.
The fibers may be bonded with a bonding agent such as a polymer, or the fibers may be thermally bonded without a bonding agent.
The fabric may be formed by any one of numerous known processes including hydroentanglement or spun-lace techniques, or by air laying or melt-blowing filaments, batt drawing, stitchbonding, etc.
depending upon the end use of the article to be made from the fabric.
Incorporated in the PP, and preferably uniformly distributed in the PP melt before it is spun into filaments, is (i) a small amount, about 1 phr (based on the weight of all the polymer from which the article is formed), of phthalocyanine or azo pigment, and typically from 0
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