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US3663284A Expired / Lapsed US ⏱️ 0.0 years remaining

Titanium dioxide suspensions

Assignee: Marine Colloids Inc
•
Filing: 1970-01-09
•
Granted: 1972-05-16
•
Expires: 1990-01-09
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Abstract

Abstract For facilitating handling and shipment titanium dioxide pigment is prepared in the form of an aqueous suspension wherein the concentration of the titanium dioxide is from about 40 percent to about 80 percent by weight of the suspension and as an agent which retards settling and packing there is included in the suspension about 0.04 percent to about 0.4 percent by weight of the suspension a water-soluble additive selected from the group of substances consisting of citric acid, tartaric acid, the sodium, potassium and ammonium salts and acid salts of citric and tartaric acids, and mixtures of said substances with each other. Preferably, as an agent which further retards settling, there is included in the suspension a gum that is in an amount not greater than about 0.4 percent by weight of the suspension and that in the amount used does not induce substantial gelation of the suspension. It likewise is preferable to include in the suspension from about 0.01 percent to about 0.1 percent by weight of the suspension of a sequestering agent for calcium cations.

Inventors

  • 👤 Dimitri J Stancioff
  • 👤 Henry J Witt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 10:13
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 52 words
An aqueous suspension of titanium dioxide pigment according to claim 1 which contains as an agent which decreases settling a water-soluble gum that is in an amount not greater than about 0.4 percent by weight of the suspension and that in the amount used does not induce substantial gelation of the suspension.
Claim 2
Dependent Claim 49 words
An aqueous suspension according to claim 2 wherein said water-soluble gum is a gum selected from the group consisting of carrageenan, carboxymethylcellulose, carboxyethylcellulose, methylcellulose, ethylcellulose, water-soluble alginates, propyleneglycol alginate, sulfated starch, sulfated cellulose, sulfated tara, sulfated locust bean gum, sulfated guar, gum tragacanth, gum karaya, furcellaran and microbial polysaccharides.
Claim 3
Dependent Claim 22 words
An aqueous suspension according to claim 3 wherein said gum constitutes from about 0.05 percent to about 0.07 percent of the suspension.
Claim 4
Dependent Claim 30 words
An aqueous suspension according to claim 1 which contains from about 0.01 percent to about 0.1 percent of the weight of the suspension of a sequestering agent for calcium cations.
Claim 5
Dependent Claim 31 words
An aqueous suspension according to claim 5 wherein said sequestering agent is selected from the group consisting of potassium tripolyphosphate, sodium hexametaphosphate, and sodium and potassium salts of ethylenediamine tetraacetic acid.
Claim 6
Dependent Claim 28 words
An aqueous suspension according to claim 5 wherein the amount of said sequestering agent is from about 0.01 percent to about 0.06 percent by weight of the suspension.
Claim 7
Dependent Claim 67 words
An aqueous suspension according to claim 1 which contains as an agent which decreases settling a gum that is in an amount not greater than about 0.4 percent by weight of the suspension and that in the amount used does not induce substantial gelation of the suspension, and about 0.01 percent to about 0.1 percent by weight of the suspension of a sequestering agent for calcium cations.
Claim 8
Dependent Claim 46 words
An aqueous suspension according to claim 8 wherein said gum is selected from the group consisting of carrageenan, carboxymethylcellulose, carboxyethylcellulose, methylcellulose, ethylcellulose, water-soluble alginates, propyleneglycol alginate, sulfated starch, sulfated cellulose, sulfated tara, sulfated locust bean gum, sulfated guar, gum tragacanth, gum karaya, furcellaran and microbial polysaccharides.

References Cited (Backward Citations)

US2819176A Cited
US3390961A Cited
US3536510A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-16 1975-11-15 1976-05-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-16 1979-11-15 1980-05-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-16 1983-11-15 1984-05-16 $7700.00 Window Closed / Lapsed

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