EP0480049A1
Expired / Lapsed
EP
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Process for coloring polymer
Assignee: Hoya Corp
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Filing: 1991-03-29
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Granted: —
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Expires: 2011-03-29
Abstract
Abstract A process for coloring polymers, which comprises the steps of: dipping a polymer which swells in water or an aqueous solvent mixture or a molding of the polymer in a treating fluid comprising an aqueous solvent mixture containing a colorant having an affinity for the polymer to thereby swell the polymer and at the same time impregnate the colorant into the polymer, and dipping the polymer thus treated in water, an aqueous acid solution or an aqueous solution of an oxidizing agent to fix the colorant to the polymer. When the molding is in contact with a mold, it is possible to carry out swelling and mold release simultaneously.
Inventors
- 👤 Kazuhisa Niijima
- 👤 Hiroshi Kiriyama
- 👤 Yuuichi Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 23:34
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67316; B; B29; B29C; B29C71/00; B29C71/0009; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00865; B29D11/00894; B29D11/00903; D06P1/0004; D06P1/90; D06P3/00; D06P3/34; D06P3/343; D06P3/52; D06P3/523; D06P5/00; D06P5/001; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; B29C2071/0018; B29K; B29K2105/00; B29K2105/0005; B29K2105/0032
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
103 words
A process for coloring a polymer product, which comprises; a step of immersing a polymer product, which is swellable in water or a water-containing mixed solvent, in a treating liquid comprising a water-containing mixed solvent containing a colorant having affinity to said polymer product thereby to carry out the swelling of said polymer product and the infiltration of the above colorant into said polymer product at the same time, and a step of immersing the above polymer product treated in the above step, in water, an acidic aqueous solution or an aqueous solution of an oxidizing agent thereby to fix the above colorant.
Claim 2
Dependent Claim
62 words
A process according to claim 1, wherein the polymer product is formed from a material selected from the group consisting of a hydroxyethyl methacrylate (HEMA) polymer, an N-methylpyrrolidone (NMP) polymer, an N-vinylpyrrolidone (NVP)-methyl methacrylate (MMA) copolymer, an HEMA-MMA-methacrylic acid (MA) copolymer, a copolymer formed from HEMA and NVP as a main component, a glycerol methacrylate-MMA copolymer, polyvinyl alcohol, polyacrylamide and polyacrylamide derivative.
Claim 3
Dependent Claim
18 words
A process according to claim 1 or 2, wherein the polymer product is a contact lens molded article.
Claim 4
Dependent Claim
32 words
A process according to claim 1, wherein the water-containing mixed solvent is a mixture of water with at least one organic solvent selected from the group consisting of alcohols, ketones and glycols.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the colorant is a solubilized vat dye or a vat dye.
Claim 6
Dependent Claim
41 words
A process according to claim 1, wherein the acidic aqueous solution or the aqueous solution of an oxidizing agent is an aqueous solution of a compound selected from acetic acid, sulfuric acid, nitric acid, hydrochloric acid, hypochlorous acid and boric acid.
Claim 7
Dependent Claim
22 words
A colored polymer product obtained by the process for coloring a polymer product, recited in any one of claims 1 to 6.
Claim 8
Dependent Claim
126 words
A process for coloring a molded article which comprises; a step of immersing a molded article being formed of a polymer product which is swellable in water or a water-containing mixed solvent and being partly in contact with a mold, in a treating liquid comprising a water-containing mixed solvent containing a colorant having affinity to said molded article thereby to carry out the releasing of said molded article from the mold, the swelling of said molded article and the infiltration of the above colorant into said molded article at the same time, and a step of immersing the above molded article treated in the above step, in water, an acidic aqueous solution or an aqueous solution of an oxidizing agent thereby to fix the above colorant.
Claim 9
Dependent Claim
61 words
A process according to claim 8, wherein the molded article is formed from material selected from the group consisting of a hydroxyethyl methacrylate (HEMA) polymer, an N-methylpyrrolidone (NMP) polymer, an N-vinylpyrrolidone (NVP)-methyl methacrylate (MMA) copolymer, an HEMA-MMA-methacrylic acid (MA) copolymer, a copolymer formed from HEMA and NVP as a main component, a glycerol methacrylate-MMA copolymer, polyvinyl alcohol, polyacrylamide and polyacrylamide derivative.
Claim 10
Dependent Claim
18 words
A process according to claim 8 or 9, wherein the molded article is a contact lens molded article.
Claim 11
Dependent Claim
32 words
A process according to claim 8, wherein the water-containing mixed solvent is a mixture of water with at least one organic solvent selected from the group consisting of alcohols, ketones and glycols.
Claim 12
Dependent Claim
18 words
A process according to claim 8, wherein the colorant is a solubilized vat dye or a vat dye.
Claim 13
Dependent Claim
41 words
A process according to claim 8, wherein the acidic aqueous solution or the aqueous solution of an oxidizing agent is an aqueous solution of a compound selected from acetic acid, sulfuric acid, nitric acid, hydrochloric acid, hypochlorous acid and boric acid.
Claim 14
Dependent Claim
22 words
A colored molded article obtained by the process for coloring a molded article, recited in any one of claims 8 to 13.
References Cited (Backward Citations)
No citation records indexed.
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