US4533484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigments for toiletries
Assignee: Dow Chemical Co
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Filing: 1983-10-06
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Granted: 1985-08-06
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Expires: 2003-10-06
Abstract
Abstract Methods of rendering water-soluble dyes insoluble comprise contacting a polymer containing X-alkyl-2-oxazolidinone with the desired dye or dyes. The essentially water-insoluble pigments so prepared are useful in a wide variety of uses and, in particular, in coloring soaps, toothpaste, etc.
Inventors
- 👤 Wilhelm E. Walles
- 👤 William H. Keskey
- 👤 Richard G. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:32
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/817; A61Q; A61Q1/00; A61Q1/02; A61Q11/00; C; C09; C09B; C09B69/00; C09B69/10; C11; C11D; C11D3/00; C11D3/40; C11D9/00; C11D9/04; C11D9/44; C11D9/444; A61K2800/00; A61K2800/40; A61K2800/56; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
82 words
A method for preparing a substantially insoluble organic pigment wherein a water-soluble organic dye is contacted with a polymer comprising X-alkyl-2-oxazolidinone moieties in an aqueous medium under conditions such that the dye can become chemically bound to the polymer, and under conditions in which the polymer is at least partially soluble, and precipitating the resulting pigment to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye under conditions at which the pigment is used.
Claim 2
Independent Claim
82 words
A method for preparing a substantially insoluble organic pigment wherein a water-soluble organic dye is contacted with a polymer comprising X-alkyl-2-oxazolidinone moieties in an aqueous medium under conditions such that the dye can become chemically bound to the polymer, and under conditions in which the polymer is at least partially soluble, and precipitating the resulting pigment to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye under conditions at which the pigment is used.
Claim 3
Dependent Claim
11 words
A method of claim 1 wherein said polymer is a poly-N-vinyl-X-alkyl-2-oxazolidinone.
Claim 4
Dependent Claim
12 words
A method of claim 2 wherein said polymer is poly-N-vinyl-5-methyl-2-oxazolidinone or poly-N-vinyl-5-ethyl-2-oxazolidinone.
Claim 5
Independent Claim
36 words
A method for preparing a substantially insoluble organic pigment wherein water-soluble dye is contacted with a polyvinylbenzyl-X-alkyl-2-oxazolidinone polymer to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye.
Claim 6
Independent Claim
36 words
A method for preparing a substantially insoluble organic pigment wherein water-soluble dye is contacted with a polyvinylbenzyl-X-alkyl-2-oxazolidinone polymer to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye.
Claim 7
Dependent Claim
10 words
A method of claim 4 wherein said polymer is polyvinylbenzyl-5-methyl-2-oxazolidinone.
Claim 8
Dependent Claim
18 words
A method of claim 1 wherein said polymer is a copolymer of a hydrophobic monomer and an N-vinyl-X-alkyl-2-oxazolidinone.
Claim 9
Dependent Claim
55 words
A method of claim 1 wherein said dye is selected from a member of the group consisting of FD&C Blue No. 1, FD&C Blue No. 2, FD&C Green No. 3, FD&C Green No. 6, FD&C Red No. 3, FD&C Yellow No. 5, FD&C Yellow No. 6, FD&C Yellow No. 7, and FD&C Yellow No. 10.
Claim 10
Dependent Claim
47 words
A method for introducing water-soluble organic dyes to toiletries such that the dyes added thereto are rendered substantially water-insoluble through the preparation of a polymer-dye pigment via the method of claim 1 and contacting said pigment with said toiletry in an amount sufficient to color said toiletry.
Claim 11
Dependent Claim
11 words
A pigment which is prepared via the method of claim 1.
Claim 12
Dependent Claim
11 words
A pigment which is prepared via the method of claim 2.
Claim 13
Dependent Claim
11 words
A pigment which is prepared via the method of claim 4.
Claim 14
Dependent Claim
11 words
A pigment which is prepared via the method of claim 6.
Claim 15
Dependent Claim
17 words
A pigment of claim 9 having a particle size from about 1 μm to about 5 μm.
Claim 16
Dependent Claim
50 words
A bar of soap containing a pigment which pigment is a substantially insoluble organic pigment, and wherein said pigment is prepared by contacting a water-soluble dye with a polymer comprising X-alkyl-2-oxazolidinone moieties to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye.
Claim 17
Dependent Claim
50 words
A bar of soap containing a pigment which pigment is a substantially insoluble organic pigment, and wherein said pigment is prepared by contacting a water-soluble dye with a polymer comprising X-alkyl-2-oxazolidinone moieties to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye.
Claim 18
Independent Claim
45 words
A method for preparing a substantially insoluble organic pigment, said method comprising contacting a water-soluble dye in a reaction medium with N-vinyl-X-alkyl-2-oxazolidinone monomers and polymerizing said monomers to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye.
Claim 19
Independent Claim
45 words
A method for preparing a substantially insoluble organic pigment, said method comprising contacting a water-soluble dye in a reaction medium with N-vinyl-X-alkyl-2-oxazolidinone monomers and polymerizing said monomers to yield pigment particles having the insolubility characteristics of the polymer and the color characteristics of the dye.
Claim 20
Dependent Claim
47 words
A method for introducing water-soluble organic dyes to toiletries such that the dyes added thereto are rendered substantially water-insoluble through the preparation of a polymer-dye pigment via the method of claim 15 and contacting said pigment with said toiletry in an amount sufficient to color said toiletry.
Claim 21
Dependent Claim
46 words
A method of claim 1 wherein said dye is contacted with said polymer in an aqueous liquid at a low temperature at which the polymer is at least partially soluble and the temperature is raised in order to precipitate the polymer and yield said pigment particles.
Claim 22
Dependent Claim
30 words
A method of claim 17 wherein said polymer is poly-N-vinyl-5-methyl-2-oxazolidinone or poly-N-vinyl-5-ethyl-2-oxazolidinone and said low temperature at which the polymer is at least partially soluble is below about 3° C.
Claim 23
Dependent Claim
11 words
A pigment which is prepared via the method of claim 15.
Claim 24
Dependent Claim
10 words
A bar of soap containing the pigment of claim 19.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |