US3669896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic white pigments containing optical brighteners and process for their manufacture
Assignee: Novartis AG
•
Filing: 1969-12-02
•
Granted: 1972-06-13
•
Expires: 1989-12-02
Abstract
Abstract The invention concerns a process for the manufacture of inorganic white pigments containing optical brighteners, characterized in that, in an aqueous suspension of an inorganic white pigment which contains a dispersion of at least one optical brightener which is sparingly soluble in water, dispersed by means of non-ionic surface-active agents, property-improving auxiliary substances for such pigments are precipitated or adsorbed on these pigments in a manner which is in itself known by admixing the property-improving auxiliary or admixing the components for the formation of such a property-improving auxiliary if several components for its formation are necessary, and the pigments treated in such manner are separated from the aqueous phase, washed and dried. The invention provides a valuable method for homogeneously distributing optical brightening agents in combination with white pigments in plastics.
Inventors
- 👤 Erich Preininger
- 👤 Dieter Ging
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/69; C; C08; C08K; C08K13/00; C08K13/02; C09; C09C; C09C1/00; C09C1/04; C09C1/06; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C09C3/00; C09C3/006; C09C3/06; C09C3/063; C09C3/08; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
Process according to claim 1 characterized in that, as property-improving auxiliary agents, those of the group of the silicates or phosphates, oxides and/or hydrated oxides of aluminum, zinc, magnesium, silicon or titanium, of an epoxide compound or of a diester of a saturated aliphatic dicarboxylic acid, alkanolamines, soaps, diketone compounds, polyacetals, dibasic carboxylic acids or reactive surface-active agents are used.
Claim 2
Dependent Claim
35 words
Process according to claim 1 characterized in that aluminum silicates which are produced by precipitation of sodium silicate with aluminum sulfate, or dialkyl esters of aliphatic saturated dicarboxylic acids, are used as property-improving auxiliary agents.
Claim 3
Dependent Claim
19 words
Process according to claim 1 characterized in that titanium dioxide or zinc oxide are used as inorganic white pigments.
Claim 4
Dependent Claim
44 words
Process according to claim 1 characterized in that the optical brightener is dispersed with non-ionic surface-active agents from the group of the polyoxalkylation products of aliphatic monohydric alcohols or aliphatic amines, in each case having up to 24 carbon atoms, or of alkyl-substituted phenols.
Claim 5
Dependent Claim
33 words
Process according to claim 1 characterized in that compounds of the group of the bis-benzoxazolyl-thiophenes, p,p''-bis-(5-phenyl-1,3,4-oxdiazol-2-yl)-stilbenes, p-phenyl-p''benzoxazolyl-stilbenes, 3-phenyl-carbostyrl derivatives, 1,4-bis-styrylbenzenes, bis-triazinyl-stilbenes, bis-styryl-diphenyl derivatives, di-benzimidazolyl-furanes, bis-benzoxazolyl-stilbenes, stilbenyl-naphthotriazoles and 3-phenyl-7-triazinyl-coumarines are used as optical brighteners.
Claim 6
Dependent Claim
92 words
Process according to claim 1 characterized in that a) optical brighteners having a solubility in water of not more than 0.5 part by weight per 100 parts by weight of water are dispersed in an aqueous medium by means of ethers of polyhydroxy compounds as non-ionic wetting agents, b) this dispersion is mixed with an aqueous suspension of titanium dioxide or zinc sulphide which can optionally contain usual components for property-improving auxiliary substances, and c) property-improving auxiliary substances are precipitated in this mixture if required after addition of further auxiliary substance components.
Claim 7
Dependent Claim
130 words
Process according to claim 1 characterized in that a) an optical brightener of the group of bis-benzoxazolyl-thiophenes, p,p''-bis-(5-phenyl-1,3,4-oxdiazol-2-yl)-stilbenes, p-phenyl-p''-benzoxazolyl-stilbenes, 3-phenyl-carbostyryl derivatives and 1,4-bis-styrylbenzenes, having a solubility in water of less than 0.5 part by weight per 100 parts by weight, is dispersed in an aqueous medium by means of a polyalkoxylation product of a hydroxy compound as a non-ionic wetting agent, b) this dispersion is mixed with an aqueous suspension of titAnium dioxide which can optionally contain components for the property-improving auxiliary substances which are to be used, and c) property-improving auxiliary substances of the group of the silicates, phosphates, oxides and/or hydrated oxides of aluminum, zinc, magnesium, silicon or titanium, of an epoxide compound or of a diester of a saturated aliphatic dicarboxylic acid are precipitated in this mixture.
References Cited (Backward Citations)
US2986528A
Cited
US3449257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |