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US 6,673,873 B1Granted
Electrostatic-dissipative multipolymer compositions
AssigneeCyro Industries
InventorDaniel Zimmerman
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AssigneeCyro Industries
InventorDaniel Zimmerman
Estimating the term…
A substantially transparent, moldable, thermoplastic multipolymer composition comprising a methyl methacrylate copolymer containing a predominant amount of methyl methacrylate and a minor amount of one or more ethylenically unsaturated monomers; and an effective amount of a polyetheresteramide to enhance the electrostatic charge dissipation of the copolymer. The polyetheresteramide has a refractive index within about 0.005 units of the refractive index of the copolymer. The composition, when subjected to injection molding, is such that the injection-molded composition exhibits a haze of not greater than about 25% and a light transmission of at least about 60%. Preferably, the composition includes an impact modifier which also has a refractive index within about 0.005 units of the refractive index of the copolymer. The composition may also include a minor amount of a polyethylene glycol having a weight average molecular weight of about 2,000 to about 10,000.
A substantially transparent, moldable, thermoplastic composition for use in the preparation of a transparent sheet product comprising:
The composition of claim 24 wherein the polybutadiene rubber is present in the amount of about 50 to about 90 parts by weight, based on the weight of the impact modifier.
A method of enhancing the electrostatic charge dissipation of a substantially transparent, moldable, thermoplastic methyl methacrylate copolymer of a predominant amount of methyl methacrylate and a minor amount of one or more ethylenically unsaturated monomers which comprises the step of blending the copolymer with an effective amount of a polyetheresteramide to enhance the electrostatic charge dissipation of the copolymer, said polyetheresteramide having a refractive index within about 0.005 units of the refractive index of the copolymer, such that when the resultant blend of the copolymer and the polyetheresteramide is injection molded into a plaque having a thickness of 0.125 inch, the plaque exhibits a haze of not greater than about 25% and a light transmission of at least about 60%.
A method of enhancing the electrostatic charge dissipation of a substantially transparent, moldable, thermoplastic methyl methacrylate copolymer of a predominant amount of methyl methacrylate and a minor amount of one or more ethylenically unsaturated monomers which comprises the step of blending the copolymer with an impact modifier and an effective amount of a polyetheresteramide to enhance the electrostatic charge dissipation of the copolymer, said impact modifier having a refractive index within about 0.005 units of the refractive index of the copolymer and said polyetheresteramide having a refractive index within about 0.005 units of the refractive index of the copolymer, such that when the resultant blend of the copolymer, impact modifier and the polyetheresteramide is injection molded into a plaque having a thickness of 0.125 inch, the plaque exhibits a haze of not greater than about 25% and a light transmission of at least about 60%.
Dependencies are inferred from the claim text.