Article comprising light absorbent composition to mask visual haze and related method
A transparent article includes a continuous polyester matrix having at least one incompatible filler dispersed therein. The incompatible filler provides domains in the polyester matrix, each domain having a particular dimension, thus providing a range of dimensions for the domains in the article. To create haze, the dimensions are within the range of from about 380 nm to about 720 nm. Once the range of dimensions is determined, a light absorbent composition can be found which absorbs light at a range of wavelengths that at least substantially covers the range of dimensions of the domains. In doing so, it has been found that the haze of the article can be substantially masked. Method for producing the article and for masking the haze are also provided.
1. A colored article comprising:
a thermoplastic polymer matrix;
a plurality of domains in a single continuous portion of the colored article wherein said domains are dispersed in the thermoplastic polymer matrix and encompass at least one incompatible filler; and
a film containing one or more light absorbing compositions overlaying the thermoplastic matrix having dispersed domains;
wherein said domains each have a dimension in an axial plane of the colored article, the dimensions of at least some of said domains in said axial plane of the colored article fall within a range of from about 400 nm to about 700 nm, and the one or more light absorbing compositions is present in an effective amount to alter the light absorption of the colored article so that the light absorbed by the colored article is such that the total amount of relative light available for reflectance, X, is less than 9.6 in an equation
X =Σ(1 −A i )× N i
where A i is the percent of light absorbed at a wavelength i without the incompatible filler present, N i is the number of domains per hundred square microns at the wavelength i, and the wavelength i ranges from 400 nm to 700 nm.
2. The colored article of claim 1 , wherein said colored article is an oriented container and wherein the single continuous portion of the colored article is a sidewall of the container.
3. The colored article of claim 1 , wherein said colored article is a plastic bottle and wherein the single continuous portion of the colored article is a sidewall of the bottle.
4. The colored article of claim 1 , wherein the thermoplastic polymer matrix is selected from the group consisting of linear polyesters, branched polyesters, polyamides, polystyrenes, polycarbonates, polyvinylchlorides, polyvinylidene dichlorides, polyacrylamides, polyacrylonitrites, polyvinylacetate, polyvinyl methyl ether, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer, low molecular weight polyolefins having 2 to 8 carbon atoms, and copolymers, terpolymers, and blends thereof.
5. The colored article of claim 1 , wherein said thermoplastic polymer matrix is a linear polyester matrix selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polytrimethylene terephthalate, polyethylene isophthalate and copolymers, terpolymers, and blends thereof.
6. The colored article of claim 5 , wherein said linear polyester matrix is polyethylene terephthalate or a copolymer thereof.
7. The colored article of claim 1 , wherein said incompatible filler is a polyamide.
8. The colored article of claim 1 , wherein said incompatible filler is poly(m-xylylene adipamide).
9. The colored article of claim 1 , wherein said incompatible filler is a gas barrier strengthening filler.
10. The colored article of claim 1 , wherein the article comprises from about 99.5 to about 50 percent by weight thermoplastic polymer and from about 0.5 to about 50 percent by weight incompatible filler.
11. The colored article of claim 1 , wherein said article comprises from about 99.5 to about 50 percent by weight polyethylene terephthalate and from about 0.5 to about 50 percent by weight poly(m-xylylene adipamide).
12. The colored article of claim 1 , wherein said light absorbent composition is a colorant.
13. The colored article of claim 12 , wherein the colorant comprises a red colorant.
14. The colored article of claim 12 , wherein the colorant comprises a blue colorant.
15. The colored article of claim 12 , wherein the colorant comprises a yellow colorant.
16. The colored article of claim 12 , wherein the colorant comprises a green colorant.