Process for making dyed articles
AssigneeBayer MaterialScience AG
InventorsRobert A. Pyles, Rick L. Archey
Life of this patent
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Abstract
A process of dyeing a molded article is disclosed. The process entails immersing at least a portion of the article in a dyeing bath, retaining the portion in the bath for a period of time sufficient to allow an amount of dye to diffuse into the article, and removing said article from the bath. The molded article comprises a polymeric resin such as (co)polyester, (co)polycarbonates, acrylonitrile-butadiene-styrene, polyamide, polyurethane, polyalkyl(meth)-acrylate, allyldiglycol carbonate and styrene copolymers. The dyeing bath contains in addition to dye, water, a plasticizing agent and a leveling agent.
Claims12
A process of dyeing a molded article comprising the steps of
- (i) immersing at least a portion of said article in a dyeing bath maintained at a temperature of 90 to 99° C. and
- (ii) retaining said portion in said bath for a period of time sufficient to allow an amount of dye to diffuse into said article, and
- (iii) removing said article from said bath,
- wherein molded article comprises at least one polymeric resin selected from the group consisting of (co)polyester, (co)polycarbonates, acrylonitrile-butadiene-styrene, polyamide, polyurethane, polyalkyl(meth)acrylate, allyldiglycol carbonate and styrene copolymers, and wherein the bath contains
- (a) 50 to 90 pbw relative to the weight of the bath of water
- (b) 0.1 to 15 pbw of dye
- (c) 2.5 to 20 pbw of at least one plasticizing agent conforming to
- R′—[(O(CH2)m)n—]OH
- where R′ is an ethyl, propyl or butyl radical,
- m is 2, 3 or 4, and
- n is 1, 2 or 3
- with the proviso that where R′ is butyl m is 2 or 4 and
- (d) 5 to 30 pbw of at least one leveling agent conforming structurally to
- H—[(O(CH2)m)n—]OH
- where m is 2, 3 or 4 and
- n is 1, 2, or 3.
A composition of matter containing a resinous component, a dye, a plasticizer and a leveling agent wherein resinous component contains at least one member selected from the group consisting of (co)polyester, (co)polycarbonates, acrylonitrile-butadiene-styrene, polyamide, polyurethane, polyalkyl(meth)acrylate, allyldiglycol carbonate and styrene copolymers, wherein plasticizer conforms to
- R′—[(O(CH2)m)n—]OH
- where R′ is an ethyl, propyl or butyl radical, m is 2, 3 or 4, and n is 1, 2 or 3 with the proviso that where R′ is butyl m is 2 or 4 and wherein leveling agent conforms structurally to
- H—[(O(CH2)m)n—]OH
- where m is 2, 3 or 4 and n is 1, 2, or 3.
Dependencies are inferred from the claim text.