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US 2019/0377106 A1Published application
Light diffusion composition and articles made therefrom
AssigneeEastman Chemical Company
InventorsMark Allen Peters, I. David Cross
Life of this patent
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Abstract
The invention relates to a light diffusion copolyester composition comprising a copolyester and a light diffusion additive. The invention further relates to articles made from the light diffusion copolyester composition comprising a copolyester and a light diffusion additive, articles made therefrom and processes for making the compositions and articles.
Claims17
A light diffusing article comprising:
- a copolyester compositions comprising:
- a) 90 to 99.5 weight percent copolyester, wherein the copolyester comprises one or more of polyethylene terephthalate (PET), glycol modified PET (PETG), glycol modified poly(cyclohexylene dimethylene terephthalate) (PCTG), poly(cyclohexylene dimethylene terephthalate) (PCT), acid modified poly(cyclohexylene dimethylene terephthalate) (PCTA), and any of the forgoing polymers modified with 2,2,4,4-tetramethylcyclobutane-1,3-diol, and
- b) 0.5 to 10 weight percent of an acrylic light diffusion additive having an D50 average particle size ranging from less than 10 microns to about 2 microns, wherein the acrylic additive comprises particles of a crosslinked acrylic polymer or a polymethyl methacrylate or a butadiene/styrene core with a methyl methacrylate (MMA) shell,
- wherein the article has a light diffusion angle of from greater than 150 to about 170 degrees,
- wherein the composition has a light transmission ranging from about 75 to about 95%, and a haze greater than 30%, measured according to ASTM D1003 on a plaque with a thickness of 3.175 mm (0.125 inch), and
- wherein the weight percentages are based on the total weight of the copolyester.
3 more elements
A method of making a light diffusing article, the method comprising:
- (a) blending 90 to 99.5 weight percent copolyester, and 0.5 to 10 weight percent of an acrylic light diffusion additive having an D50 average particle size ranging from less than 10 microns to about 0.5 microns to form a light diffusing composition, and
- (b) forming the article by extrusion or injection molding,
- wherein the copolyester comprises one or more of polyethylene terephthalate (PET), glycol modified PET (PETG), glycol modified poly(cyclohexylene dimethylene terephthalate) (PCTG), poly(cyclohexylene dimethylene terephthalate) (PCT), acid modified poly(cyclohexylene dimethylene terephthalate) (PCTA), and any of the forgoing polymers modified with 2,2,4,4-tetramethylcyclobutane-1,3-diol,
- wherein the acrylic additive comprises particles of a crosslinked acrylic polymer or a polymethyl methacrylate or a butadiene/styrene core with a methyl methacrylate (MMA) shell,
- wherein the article has a light diffusion angle of from greater than 150 to about 170 degrees,
- wherein the article has a light transmission ranging from about 75 to about 95%, and a haze greater than 30%, measured according to ASTM D1003 on a plaque with a thickness of 3.175 mm (0.125 inch), and
- wherein the weight percentages are based on the total weight of the copolyester and the additive.
4 more elements
A light diffusing composition comprising:
- a) 90 to 99.5 weight percent copolyester, wherein the copolyester comprises one or more of glycol modified poly(cyclohexylene dimethylene terephthalate) (PCTG), poly(cyclohexylene dimethylene terephthalate) (PCT), acid modified poly(cyclohexylene dimethylene terephthalate) (PCTA), and any of the forgoing polymers or polyethylene terephthalate (PET), or glycol modified PET (PETG), modified with 2,2,4,4-tetramethylcyclobutane-1,3-diol, and
- b) 0.5 to 10 weight percent of an acrylic light diffusion additive having an D50 average particle size ranging from less than 10 microns to about 2 microns, wherein the acrylic additive comprises particles of a crosslinked acrylic polymer or a polymethyl methacrylate or a butadiene/styrene core with a methyl methacrylate (MMA) shell,
- wherein the composition has a light diffusion angle of from greater than 150 to about 175 degrees,
- wherein the composition has a light transmission ranging from about 75 to about 95%, and a haze greater than 30%, measured according to ASTM D1003 on a plaque with a thickness of 3.175 mm (0.125 inch), and
- wherein the weight percentages are based on the total weight of the copolyester and the additive.
2 more elements
A light diffusing composition comprising:
- a) 90 to 99.5 weight percent copolyester, wherein the copolyester comprises one or more of glycol modified poly(cyclohexylene dimethylene terephthalate) (PCTG), glycol modified poly(cyclohexylene dimethylene terephthalate) (PCTG), poly(cyclohexylene dimethylene terephthalate) (PCT), acid modified poly(cyclohexylene dimethylene terephthalate) (PCTA), and any of the forgoing polymers modified with 2,2,4,4-tetramethylcyclobutane-1,3-diol,
- b) 0.5 to 10 weight percent of an acrylic light diffusion additive having an D50 average particle size ranging from less than 10 microns to about 2 microns, wherein the acrylic additive comprises particles of a crosslinked acrylic polymer or a polymethyl methacrylate or a butadiene/styrene core with a methyl methacrylate (MMA) shell,
- wherein the composition has a light diffusion angle of from greater than 150 to about 175 degrees,
- wherein the composition has a light transmission ranging from about 75 to about 95%, and a haze greater than 30%, measured according to ASTM D1003 on a plaque with a thickness of 3.175 mm (0.125 inch), and
- wherein the weight percentages are based on the total weight of the copolyester and the additive.
2 more elements
Dependencies are inferred from the claim text.