US4892902A
Expired / Lapsed
US
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Method for production of aqueous dispersion of inorganic pigment
Assignee: Nippon Shokubai Co Ltd
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Filing: 1989-03-27
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Granted: 1990-01-09
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Expires: 2009-03-27
Abstract
Abstract A method for the production of an aqueous dispersion by the dispersion of an inorganic pigment such as calcium carbonate and aluminum hydroxide in an aqueous medium, which method comprises incorporating in said inorganic pigment as a dispersant a carboxyl group-containing water-soluble polymer possessing a number average molecular weight in the range of 2,000 to 80,000 and/or a water-soluble condensed phospate and a water-soluble anionic modified polyvinyul alcohol possessing a polymerization degree in the range of 30 to 700, a saponification degree in the range of 30 to 100 mol %, and an anionic modification degree in the range of 0.5 to 20 mol %.
Inventors
- 👤 Shobu Shioji
- 👤 Masazumi Sasabe
- 👤 Yorimichi Dairoku
- 👤 Teruaki Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:29
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/10; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C09D; C09D17/00; C09D17/001; C09D17/004; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/60; C08J2300/00; C08J2300/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A method for the production of an aqueous dispersion by the dispersion of an inorganic pigment in an aqueous medium, which method comprises incorporating in said inorganic pigment as a dispersant (I) 0.1 to 2 parts by weight of a water-soluble condensed phosphate and (II) 0.03 to 1 part by weight of a water-soluble anionic modified polyvinyl alcohol possessing a polymerization degree in the range of 30 to 700 , a saponification degree in the range of 30 to 100 mol%, and an anionic modification degree in the range of 0.5 to 20 mol%, respectively based on 100 parts by weight of said inorganic pigment.
Claim 2
Independent Claim
105 words
A method for the production of an aqueous dispersion by the dispersion of an inorganic pigment in an aqueous medium, which method comprises incorporating in said inorganic pigment as a dispersant (I) 0.1 to 2 parts by weight of a water-soluble condensed phosphate and (II) 0.03 to 1 part by weight of a water-soluble anionic modified polyvinyl alcohol possessing a polymerization degree in the range of 30 to 700 , a saponification degree in the range of 30 to 100 mol%, and an anionic modification degree in the range of 0.5 to 20 mol%, respectively based on 100 parts by weight of said inorganic pigment.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said inorganic pigment is at least one member selected from the group consisting of calcium carbonate and aluminum hydroxide.
Claim 4
Dependent Claim
13 words
A method according to claim 1, wherein said inorganic pigment is calcium carbonate.
Claim 5
Dependent Claim
13 words
A method according to claim 1, wherein said inorganic pigment is aluminum hydroxide.
Claim 6
Dependent Claim
26 words
A method according to claim 1, wherein said water-soluble condensed phosphate (b) is at least one member selected from the group consisting of hexamethaphosphates and pyrophosphates.
Claim 7
Dependent Claim
26 words
A method according to claim 1, wherein said anionic modification of said water-soluble anionic modified polyvinyl alcohol (II) is modification by sulfonation or modification by carboxylation.
Claim 8
Dependent Claim
22 words
A method according to claim 1, wherein said water-soluble anionic modified polyvinyl alcohol (II) is a water-soluble polyvinyl alcohol modified by sulfonation.
Claim 9
Dependent Claim
22 words
A method according to claim 1, wherein said water-soluble anionic modified polyvinyl alcohol (II) is a water-soluble polyvinyl alcohol modified by carboxylation.
Claim 10
Dependent Claim
49 words
A method according to claim 1, wherein said water-soluble anionic modified polyvinyl alcohol (II) possesses a polymerization degree in the range of 100 to 300, a saponification degree in the range of 65 to 100 mol%, and an anionic modification degree in the range of 1 to 10 mol%.
Claim 11
Dependent Claim
37 words
A method according to claim 1, which method comprises incorporating in (I) 0.2 to 1.5 parts by weight of water-soluble condensed phosphate and (II) 0.05 to 0.8 part by weight of a water-soluble anionic modified polyvinyl alcohol.
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |