US4638025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pigmenting water-absorbable plastic and products therefrom
Assignee: Cooper Companies Inc
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Filing: 1985-04-17
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Granted: 1987-01-20
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Expires: 2005-04-17
Abstract
Abstract A colored opacified plastic material containing an organic binder, at least one pigment, a hydrophilic polymerizable plastic material and a cross linking agent is disclosed together with a method of making the same.
Inventors
- 👤 Ari Fuhrman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:34
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/021; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00317; B29D11/00471; B29D11/00865; B29D11/00894; B29D11/00913; C; C08; C08F; C08F251/00; C08F251/02; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A colored opacified plastic material comprising an organic binder, at least one pigment, a water-absorbable plastic material and a cross-linking agent, wherein said organic binder is cellulose acetate butyrate in a concentraction of from about 0.4 to 0.74% by weight and said water-absorbable plastic material is 2-hydroxyethylemthacrylate in a concentration of from about 96 to 99% by weight.
Claim 2
Dependent Claim
58 words
A colored opacified plastic material comprising an organic binder, at least one pigment, a water-absorbable plastic material and a cross-linking agent, wherein said organic binder is cellulose acetate butyrate in a concentraction of from about 0.4 to 0.74% by weight and said water-absorbable plastic material is 2-hydroxyethylemthacrylate in a concentration of from about 96 to 99% by weight.
Claim 3
Dependent Claim
24 words
The colored opacified plastic material of claim 1, wherein said 2-hydroxyethylmethacrylate is present in a concentraction of from about 98 to 98.5% by weight.
Claim 4
Dependent Claim
15 words
The colored opacified material of claim 1, wherein said cross-linking agent is ethylene glycol dimethacrylate.
Claim 5
Dependent Claim
45 words
The colored opacified plastic material of claim 3, wherein said pigment is present in an amount of from about 0.4 to 0.74% by weight and the ethylene glycol dimethacrylate is present in an amount of from about 0.35 to 0.5% by weight of the 2-hydroxyethylmethacrylate.
Claim 6
Independent Claim
106 words
A method for producing a colored, water-absorbable soft contact lens blank, which comprises: (a) melting a cellulose acetate butyrate (CAB) binder; (b) pre-dispersing at least one pigment into the molten CAB; (c) cooling and crushing the pigmented CAB binder into a particulate, crystalline product; (d) dispersing the particulate, crystalline product in cross-linked 2-hydroxyethylmethacrylate (HEMA) in proportions such that the resulting dispersion contains from about 96 to 99% by weight HEMA and from 0.4 to 0.74% CAB by weight; (e) gelling the HEMA dispersion of the pigmented CAB; and (f) polymerizing the gelled dispersion within a mold to produce the desired colored, water-absorbable soft contact lens blank.
Claim 7
Independent Claim
106 words
A method for producing a colored, water-absorbable soft contact lens blank, which comprises: (a) melting a cellulose acetate butyrate (CAB) binder; (b) pre-dispersing at least one pigment into the molten CAB; (c) cooling and crushing the pigmented CAB binder into a particulate, crystalline product; (d) dispersing the particulate, crystalline product in cross-linked 2-hydroxyethylmethacrylate (HEMA) in proportions such that the resulting dispersion contains from about 96 to 99% by weight HEMA and from 0.4 to 0.74% CAB by weight; (e) gelling the HEMA dispersion of the pigmented CAB; and (f) polymerizing the gelled dispersion within a mold to produce the desired colored, water-absorbable soft contact lens blank.
Claim 8
Dependent Claim
17 words
The method according to claim 5, wherein said water-absorbable soft contact lens blank is cured following polymerization.
Claim 9
Dependent Claim
15 words
The method according to claim 5, wherein the HEMA is cross-linked with ethylene glycol dimethacrylate.
Claim 10
Dependent Claim
18 words
The method according to claim 5, wherein polymerization of the gelled dispersion is catalysed by an organic peroxide.
Claim 11
Dependent Claim
28 words
The method according to claim 5, wherein the resulting dispersion formed in step (d) contains HEMA in a concentration range of from about 98 to 98.5% by weight.
Claim 12
Independent Claim
111 words
A method for producing a colored, water-absorbable soft contact lens, which comprises: (a) melting a cellulose acetate butyrate (CAB) binder; (b) pre-dispersing at least one pigment into the molten CAB; (c) cooling and crushing the pigmented CAB binder into a particulate, crystalline product; (d) dispersing the particulate crystalline product in cross-linked 2-hydroxyethylemthacrylate (HEMA) in proportions such that the resulting dispersion contains from about 96 to 99% by weight HEMA and from about 0.4 to 0.74% CAB by weight; (e) contacting the HEMA dispersion of the pigmented CAB with a polymerization catalyst to form a viscous colored material; and (f) spin casting the viscous colored material into a pigmented water-absorbable contact lens.
Claim 13
Independent Claim
111 words
A method for producing a colored, water-absorbable soft contact lens, which comprises: (a) melting a cellulose acetate butyrate (CAB) binder; (b) pre-dispersing at least one pigment into the molten CAB; (c) cooling and crushing the pigmented CAB binder into a particulate, crystalline product; (d) dispersing the particulate crystalline product in cross-linked 2-hydroxyethylemthacrylate (HEMA) in proportions such that the resulting dispersion contains from about 96 to 99% by weight HEMA and from about 0.4 to 0.74% CAB by weight; (e) contacting the HEMA dispersion of the pigmented CAB with a polymerization catalyst to form a viscous colored material; and (f) spin casting the viscous colored material into a pigmented water-absorbable contact lens.
Claim 14
Dependent Claim
28 words
The method according to claim 10, wherein the resulting dispersion formed in step (d) contains HEMA in a concentraction range of from about 98 to 98.5% by weight.
References Cited (Backward Citations)
US3171869A
Cited
US3557261A
Cited
US4234466A
Cited
US4157892A
Cited
SU511827A1
Cited
US3992563A
Cited
US4252421A
Cited
US4248989A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |