Injection molded article and method for the manufacture thereof
AssigneeSabic Innovative Plastics IP B.V.
InventorGeoffrey Henry Riding
Life of this patent
Estimating the term…
Abstract
Articles injection molded from colored poly(arylene ether) compositions can exhibit an esthetic defect known as black rings. The black rings can be reduced or eliminated when the poly(arylene ether) composition includes about 50 to about 70 weight percent of a poly(arylene ether), about 12 to about 30 weight percent of a rubber-modified polystyrene, about 5 to about 25 weight percent of an organophosphate ester flame retardant, and a first colorant and a second colorant, wherein the total amount of all colorants is about 0.3 to about 1 weight percent.
Claims14
A method of reducing esthetic defects in an injection molded article, the method comprising:
- injection molding a poly(arylene ether) composition to form an injection molded article;
- wherein a portion of the injection molded article comprises
- a first dimension of at least 10 centimeters,
- a second dimension of at least 10 centimeters, and
- a third dimension of less than or equal to 1 centimeter;
- wherein the poly(arylene ether) composition comprises
- about 50 to about 70 weight percent of a poly(arylene ether) having an intrinsic viscosity of about 0.3 to about 0.55 deciliter/gram measured at 25° C. in chloroform,
- about 12 to about 30 weight percent of a rubber-modified polystyrene,
- wherein the rubber-modified polystyrene comprises polystyrene and polybutadiene,
- about 5 to about 25 weight percent of an organophosphate ester flame retardant,
- a first colorant and a second colorant, wherein the total amount of all colorants is about 0.3 to about 1 weight percent, and
- about 1 to about 5 weight percent of a hydrocarbon resin selected from the group consisting of aliphatic/aromatic hydrocarbon resins, hydrogenated aliphatic/aromatic hydrocarbon resins, cycloaliphatic hydrocarbon resins, hydrogenated cycloaliphatic hydrocarbon resins, cycloaliphatic/aromatic hydrocarbon resins, hydrogenated cycloaliphatic/aromatic hydrocarbon resins, hydrogenated aromatic hydrocarbon resins, polyterpene resins, terpene-phenol resins, rosins, hydrogenated rosins, rosin esters, hydrogenated rosin esters, coumarone/indene resins, hydrogenated terpene resins, and combinations thereof;
- wherein all weight percents are based on the total weight of the poly(arylene ether) composition.
Dependencies are inferred from the claim text.