Plastic and nonmetallic article shaping or treating: processes – With incorporating dye susceptible material or dyeing workpiece
Patent
1991-02-22
1993-03-02
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With incorporating dye susceptible material or dyeing workpiece
8497, 8597, 8613, 8661, 8662, 264211, 524 88, D01F 104, D01F 106
Patent
active
051907100
ABSTRACT:
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.
REFERENCES:
patent: 4035323 (1977-07-01), Mathis
patent: 4291093 (1981-09-01), Wishman et al.
patent: 4816507 (1989-03-01), Cantatore et al.
patent: 5049600 (1991-09-01), Kletecka
Uzelmeier, C. W. "How Heat and Light Affect Pigmented Polypropylene", SPE Journal, vol. 26 (May 1970), pp. 69-74.
Leu, K. W. et al. "Recent Development in UV-Stabilization of Polypropylene Fibers", presented at the Plastics Institute of Australia Inc. Residential Technical Seminar (1974).
Carlsson, D. J. et al. "The Photooxidative Degradation of Polypropylene. Part II. Photostabilization Mechanisms", Journal of Macromolecular Science-Rev. Macromol. Chem., C14(2), 1976, p. 157.
Steinlin, F. et al. "Influence of Pigments on the Degradation of Polypropylene Fibers on Exposure to Light and Weather", presented at the 19th International Manmade Fiber Conference (Austria 1980).
Allen, N. S. et al. "Interaction between Antioxidants and Hindered Piperidine Compounds in the Photostabilization of Polypropylene: Influence of Processing History", Polymer Photochemistry, vol. 1 (1981), pp. 111-121.
Allen, N. S. et al. "Photo-Stabilization Action of Para-Hydroxybenzoate Compound in Polyolefins--Part I: Thermal and Photochemical Behavior in Polypropylene Film", Polymer Degradation and Stability, vol. 5 (1983), pp. 241-266.
Wishman, M. "Stabilization of Polypropylene Fibers", 1984.
Allen, N. S. et al. "Photo-Stabilizing Action of Para-Hydroxybenzoate Light Stabilizer in Polyolefins: Part III--Antioxidant Behavior and Additive/Pigment Interactions in High Density Polyethylene", Polymer Degradation and Stability, vol. 10 (1985), pp. 1-13.
Allen, N. S. et al. "Photo-Stabilizing Action of Para-Hydroxybenzoate Light Stabilizer in Polyolefins: Part IV--Catalyst Effects and Additive Interactions in Linear Low Density Polyethylene", Polymer Degradation and Stability, vol. 12 (1985), pp. 363-372.
Lobo Alfred D.
Tentoni Leo B.
The B. F. Goodrich Company
LandOfFree
Method for imparting improved discoloration resistance to articl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for imparting improved discoloration resistance to articl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for imparting improved discoloration resistance to articl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-125148