US4245991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dip dyeing of plastic articles and the dye bath composition thereof
Assignee: Foster Grant Co Inc
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Filing: 1979-12-12
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Granted: 1981-01-20
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Expires: 1999-12-12
Abstract
Abstract Dyeing of plastic articles, particularly sunglass lenses is conducted by use of a dye bath composition comprising a dye and a mixed solvent. At least about 70 weight % of the mixed solvent consists of glycerol and ethylene glycol whose relative ratio is in the range of from 95:5 to 20:80. The dyeing method and the dye bath composition are very advantageous for manufacturing sunglass lenses having high optical and aesthetic quality, particularly for dyeing hard-coated polarized lenses.
Inventors
- 👤 Theodore A. Haddad
- 👤 Walter Kondig
- 👤 Richard A. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:35
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0083; D; D06; D06P; D06P1/00; D06P1/90; D06P1/92; D06P1/928; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
43 words
A dye bath composition comprising a disperse dye and a mixed solvent, said mixed solvent comprising about 70 to about 100 weight percent of glycerol and ethylene glycol in a relative weight ratio in the range of from about 95:5 to about 20:80.
Claim 2
Dependent Claim
43 words
A dye bath composition comprising a disperse dye and a mixed solvent, said mixed solvent comprising about 70 to about 100 weight percent of glycerol and ethylene glycol in a relative weight ratio in the range of from about 95:5 to about 20:80.
Claim 3
Dependent Claim
36 words
A dye bath composition of claim 1, wherein the concentration of the dye is in the range of from about 0.2 to about 15 weight percent based on the total weight of the dye bath composition.
Claim 4
Dependent Claim
16 words
A dye bath composition of claim 1, wherein the mixed solvent is substantially free of water.
Claim 5
Dependent Claim
18 words
A dye bath composition of claim 3, wherein the mixed solvent consists essentially of glycerol and ethylene glycol.
Claim 6
Dependent Claim
35 words
A dye bath composition according to any of claims 1, 2, 3 and 4 wherein the relative weight ratio between glycerol and ethylene glycol is in the range of from about 90:10 to about 30:70.
Claim 7
Dependent Claim
40 words
A dye bath composition according to any of claims 1, 2, 3 and 4 wherein the dye concentration is in the range of from about 3 to about 8 percent based on the total weight of the dye bath composition.
Claim 8
Dependent Claim
64 words
A process of dyeing an organic polymer resin comprising contacting said resin with a dye bath composition comprising a disperse dye and a mixed solvent, said mixed solvent comprising about 70 to about 100 weight percent of glycerol and ethylene glycol wherein the relative weight ratio between the said glycerol and said ethylene glycol is in the range of about 95:5 to about 20:80.
Claim 9
Dependent Claim
64 words
A process of dyeing an organic polymer resin comprising contacting said resin with a dye bath composition comprising a disperse dye and a mixed solvent, said mixed solvent comprising about 70 to about 100 weight percent of glycerol and ethylene glycol wherein the relative weight ratio between the said glycerol and said ethylene glycol is in the range of about 95:5 to about 20:80.
Claim 10
Dependent Claim
37 words
A process of dyeing an organic polymer resin according to claim 7 wherein the concentration of the dye is from about 0.2 to about 15 weight percent based on the total weight of the dye bath composition.
Claim 11
Dependent Claim
22 words
A process of dyeing an organic polymer resin according to claim 7 wherein the dye bath composition is substantially free of water.
Claim 12
Dependent Claim
23 words
A process of dyeing an organic polymer resin according to claim 9 wherein the mixed solvent consists essentially of glycerol and ethylene glycol.
Claim 13
Dependent Claim
39 words
A process of dyeing an organic polymer resin according to any of claims 7, 8, 9 and 10, wherein the relative weight ratio between glycerol and ethylene glycol is in the range of from about 90:10 to about 30:70.
Claim 14
Dependent Claim
42 words
A process of dyeing an organic polymer resin according to any of claims 7, 8, 9 and 10, wherein the dye concentration is in the range of about 3 to about 8 percent based on the total weight of the dye solution.
Claim 15
Dependent Claim
22 words
A process according to any of claims 7, 8, 9 and 10, wherein said organic polymer resin is a plastic sunglass lens.
Claim 16
Dependent Claim
29 words
A process according to any of claims 7, 8, 9 and 10 wherein said organic polymer resin is a polarized sunglass lens having a hard coat on the surface.
Claim 17
Dependent Claim
21 words
A process according to any of claims 7, 8, 9 and 10 wherein said organic polymer resin is allyl diglycol carbonate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |