Organic fluid systems containing clay/polyamide compositions

• US 5,939,475 A
• Filed: 09/03/1996
• Issued: 08/17/1999
• Est. Priority Date: 09/03/1996
• Status: Expired due to Fees

• Current Assignee: Elementis Specialties, Inc. (Elementis PLC)
• Original Assignee: Rheox, Inc. (Elementis PLC)
• Inventors: Hawthorne, Glen, Reynolds, William
• Primary Examiner(s): Lovering, Richard D.
• Application Number:
  US08/697,970
• Time in Patent Office: 1,078 Days
• Field of Search: 252/309, 252/315.2, 507/901, 507/133, 524/445, 524/923, 524/230, 260/DIG. 38, 508/136, 510/418, 510/507
• US Class Current: 524/230
• CPC Class Codes: C08K 3/346 Clay
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence
• CPC Class Codes: C09D 7/40 Additives
• CPC Class Codes: C09D 7/43 Thickening agents
• CPC Class Codes: C09K 8/32 Non-aqueous well-drilling compositions, e.g. oil-based
• CPC Class Codes: Y10S 260/38 Ink
• CPC Class Codes: Y10S 507/901 Organically modified inorganic solid
• CPC Class Codes: Y10S 524/923 Treating or preparing a nonaqueous dispersion or emulsion of a solid polymer or specified intermediate condensation product

Abstract

A novel pourable organophilic clay polyamide composition useful as a rheological additive for organic fluid system comprising

a) from about 5 to 15 weight percent of an organophilicly modified smectite-type clay,

b) from about 25 to about 35 weight percent of one or more rheologically active polyamides and

c) from about 40 to 60 weight percent of one or more organic solvents preferably selected from the group consisting of n-propanol, toluene and mineral spirits.

The organophilic clay polyamide composition is used in non-aqueous fluid systems such as paints, inks, and coatings to provide improved rheological properties to the system.

Claims

1. A liquid organic fluid system selected from the group consisting of paint, varnishes, sealants, adhesives, drilling fluids, waxes, greases and inks containing a pumpable organophilic clay/polyamide composition providing the liquid organic system with rheological properties where the organophilic clay/polyamide composition comprises;

1) from about 5 to 15 weight percent of an organophilicy modified smectite-type clay,

2) from about 25 to about 35 weight percent of one or more defined rheologically active polyamides wherein the rheologically active polyamide is a polyamide ester comprising the reaction product of polycarboxylic acid, an active hydrogen compound, an alkoxylated active hydrogen compound and a capping agent and,

3) from about 40 to 60 weight percent of one or more organic solvents selected from the group consisting of low molecular weight alcohols and aromatic solvents.

2. The liquid organic fluid system of claim 1, wherein said liquid organic fluid system is selected from the group consisting of oil base drilling fluids and polyester resins.

3. The liquid organic fluid system of claim 1 wherein the organophilic modified smectite-type clay is made from a smectite-type clay or clays selected from the group consisting of bentonite, hectorite and mixtures thereof.

4. The liquid organic fluid system of claim 1, wherein said pumpable organophilic clay/polyamide composition is present in an amount of about 0.01% to about 15% based on the total weight of said non-aqueous fluid system.

5. A liquid organic paint system comprising:

1) an organic liquid and

2) one or more organophilic clays which organophilic clay or clays comprises the reaction product of;

1) a smectite-type clay having a specific cation exchange capacity of about at least 75 milliequivalent per 100 grams of clay, 100% clay, active clay basis; and

2) a quaternary ammonium compound or compounds in an amount sufficient to satisfy at least 75% of said specified cation exchange capacity of the clay, and

3) one or more rheologically active polyamides comprising the reaction product of polycarboxlic acid, an active hydrogen compound, an alkoxylated active hydrogen compound and a capping agent.

6. The paint system of claim 5 wherein the organic liquid is selected from the group consisting of n-propanol, toluene and mineral spirits.

7. The paint system of claim 5 wherein the organophilic modified clay is made from a smectite-type clay or clays selected from the group consisting of bentonite, hectorite and mixtures thereof.

8. The paint system of claim 5 wherein the organophilic clay or clays and the one or more rheologically active polyamides are present in an amount of about 0.01% to about 15% based on the total weight of the paint system.