EP0082026A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A process for producing coloured shaped articles
Assignee: Ricky Contact Lens Research Institute Inc
•
Filing: 1982-12-16
•
Granted: —
•
Expires: 2002-12-16
Abstract
Abstract A uniformly coloured shaped article which is resistant to discolouration and fading can be produced by immersing a shaped article, particularly a contact lens, consisting of a polymer of at least one monomer which is an acrylate and/or methacrylate in a dyeing solution prepared by dissolving a water-soluble dye in a solvent capable of swelling said polymer, to swell and colour the shaped article, and then drying the swollen shaped article.
Inventors
- 👤 Taro Suminoe
- 👤 Tetsuo Ito
- 👤 Yasuhiro Kiyomatsu
- 👤 Takao Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 12:44
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; B29D11/00894; B29D11/00903; B29D11/00009; B29D11/00038; D; D06; D06P; D06P1/00; D06P1/90; D06P1/92; D06P1/922; D06P1/924; D06P1/926; D06P3/00; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
A process for producing a coloured shaped article, by immersing a shaped article formed of a polymer of at least one monomer which is an acrylate and/or methacrylate in a dyeing solution prepared by dissolving a water-soluble dye in a solvent capable of swelling said polymer, to swell and colour the shaped article, and then drying the swollen shaped article.
Claim 2
Dependent Claim
60 words
A process for producing a coloured shaped article, by immersing a shaped article formed of a polymer of at least one monomer which is an acrylate and/or methacrylate in a dyeing solution prepared by dissolving a water-soluble dye in a solvent capable of swelling said polymer, to swell and colour the shaped article, and then drying the swollen shaped article.
Claim 3
Dependent Claim
14 words
A process according to Claim 1, wherein the shaped article is a contact lens.
Claim 4
Dependent Claim
53 words
A process according to Claim 1 or Claim 2, wherein the monomer is methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, t-butyl acrylate, 2-ethyl hexyl acrylate, octyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, hexyl methacrylate or octyl methacrylate.
Claim 5
Dependent Claim
20 words
A process according to any one of the preceding Claims, wherein the polymer is a copolymer with a polyfunctional monomer.
Claim 6
Dependent Claim
48 words
A process according to Claim 4, wherein the polyfunctional monomer is ethylene glycol diacrylate, diethyl ene glycol diacrylate, triethylene glycol diacryl ate, ethylene glycol dimethacryl ate, diethyl ene glycol dimethacryl ate, triethyl ene glycol dimethacryl ate, trimethyl - lolpropane trimethacrylate, allyl acryl ate or a vinyl-substituted benzyl acrylate.
Claim 7
Dependent Claim
37 words
A process according to Claim 4 or Claim 5, wherein the amount of the polyfunctional monomer copolymerized is from 0.1 to 50 mole % based on the total amount of the acrylates, methacrylates and the polyfunctional monomers.
Claim 8
Dependent Claim
36 words
A process according to any one of the preceding Claims, wherein the solvent is a lower alcohol, a ketone, a chlorinated hydrocarbon, an ether or an ester or a mixture of any two or more thereof.
Claim 9
Dependent Claim
53 words
A process according to Claim 7, wherein the solvent is methyl alcohol, ethyl alcohol,isopropyl alcohol, acetone, methyl ethyl ketone, dichloromethane, chloroform, diethyl ether, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, ethyl acetate, methyl formate, ethyl formate or butyl formate or a mixture of any two or more thereof.
Claim 10
Dependent Claim
25 words
A process according to any one of the preceding Claims, wherein the dye concentration in the dyeing sclution is from 0.001 to 10% by weight.
Claim 11
Dependent Claim
21 words
A process according to any one of the preceding Claims, wherein the immersion time is from 10 seconds to 2 hours.
Claim 12
Dependent Claim
27 words
A process according to any one of the preceding Claims, wherein the dye is a direct dye, an acidic dye, a basic dye or a vat dye.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.