Patent US3963512A successfully refreshed from Google Patents.
US3963512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of mineral surfaces
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1974-09-16
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Granted: 1976-06-15
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Expires: 1994-09-16
Abstract
Abstract A method of modifying the surface properties of particulate mineral materials by forming on the surface of the particles a coating having a significant number of acidic sites with pKa values of less than 2.8.
Inventors
- 👤 Jean Drummond Swift
- 👤 David Geoffrey Hawthorne
- 👤 Bryan Clarence Loft
- 👤 David Henry Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:12
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/006; C08; C08K; C08K9/00; C08K9/08; C09C3/06; C09C3/063; C09C3/08; C09C3/10; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/80; C01P2006/00; C01P2006/22; C01P2006/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
A pigment or filler material consisting of a particulate mineral other than titanium dioxide having a surface coating with a significant number of acidic sites with pKa values less than 2.8, and which has been modified by the addition of a polymeric coating formed by in situ acid-catalyzed polymerization of at least one organic monomer, followed by neutralization of the surface with a base which terminates the polymerization reaction.
Claim 2
Dependent Claim
69 words
A pigment or filler material consisting of a particulate mineral other than titanium dioxide having a surface coating with a significant number of acidic sites with pKa values less than 2.8, and which has been modified by the addition of a polymeric coating formed by in situ acid-catalyzed polymerization of at least one organic monomer, followed by neutralization of the surface with a base which terminates the polymerization reaction.
Claim 3
Dependent Claim
33 words
A pigment or filler material as claimed in claim 1, wherein the monomer is selected from the group consisting of styrene and substituted styrenes, vinyl ethers, vinyl-heterocycles, divinyl-aromatics, divinyl-oxyalkanes, vinyl ketones and epoxides.
Claim 4
Dependent Claim
32 words
A pigment or filler material as claimed in claim 1, wherein the base is an organic base selected from the group consisting of amines, amides, amino esters, alcohols, esters, ketones and ethers.
Claim 5
Dependent Claim
28 words
A pigment or filler material as claimed in claim 1, wherein the base is an organic base which contains unsaturated groups susceptible to free radical attack and/or polymerization.
Claim 6
Dependent Claim
42 words
A pigment or filler material as claimed in claim 4, wherein the organic base is selected from the group consisting of aminoalkyl esters of acrylic and methacrylic acids, allylamine and substituted allylamines, vinyl silanes and silylalkyl esters of acrylic and methacrylic acids.
Claim 7
Dependent Claim
31 words
A pigment or filler material as claimed in claim 1, wherein the polymeric coating includes functional groups which are capable of oxidation to species which can act as free radical generators.
Claim 8
Dependent Claim
23 words
A pigment or filler material as claimed in claim 6, wherein the functional groups are capable of oxidation to peroxides, hydroperoxides or ozonides.
Claim 9
Dependent Claim
47 words
A pigment or filler material as claimed in claim 1, wherein the polymeric coating includes reactive groups or groups convertible into such reactive groups which can initiate grafting reactions between the coating and a polymeric matrix into which the pigment or filler material is to be incorporated.
Claim 10
Dependent Claim
17 words
A pigment or filler material as claimed in claim 3 wherein the organic base is an amine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |