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US2941970A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for dispersion of pigments in acrylonitrile polymer solutions

Assignee: Solutia Inc
•
Filing: 1955-06-08
•
Granted: 1960-06-21
•
Expires: 1975-06-08
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Abstract

Abstract Pigmented solutions of polymers of at least 85% by weight of acrylonitrile are prepared by a process which comprises mixing an aqueous dispersion of pigment having particles not greater than about 1 micron in diameter with an organic solvent compatible with the acrylonitrile polymer, reducing, when necessary, the water content of the resulting dispersion, e.g. by distillation, until it contains not more than 3% water based on the weight of the organic solvent, and admixing the resulting dispersion with the acrylonitrile polymer. Polymers specified are polyacrylonitrile and copolymers of acrylonitrile with up to 15% of monomers such as vinyl acetate and vinyl chloracetate, C1-C4 alkyl acrylates, methacrylates, fumarates, and maleates, methacrylonitrile, styrene, alphamethyl styrene and vinyl and vinylidene chlorides. Solvents specified are dimethyl formamide, acetamide and methoxyacetamide, tris-(dimethylamido) phosphate, bis-(dimethylamido) and dimethyl methane phosphonate, diethyl phosphite, N-methyl pyrrolidone, 1,5-dimethyl pyrrolidone, butyrolactone and ethylene carbonate. The pigments specified are of the organic type. The resulting acrylonitrile polymer solutions may be spun to produce fibres.

Inventors

  • 👤 Alfred B Craig

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 19:51
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; D; D01; D01D; D01D1/00; D01D1/06; D01D1/065; D01F; D01F1/00; D01F1/02; D01F1/04; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; C08J2333/00; C08J2333/18; C08J2333/20

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 163 words
A PROCESS FOR PREPARING A SOLUTION OF A POLYMER OF AT LEAST 85 PERCENT BY WEIGHT ACRYLONITRILE AND UP TO 15 PERCENT OF ANOTHER MONOMER COPOLYMERIZABLE THEREWITH IN AN ORGANIC SOLVENT THEREFOR AND HAVING WATER-DISPERSIBLE PIGMENT PARTICLES NONE GREATER THAN ABOUT 1 MICRON IN DIAMETER DISPERSED THROUGHT SAID SOLUTION, WHICH COMPRISES MIXING AN AQUEOUS DISPERSION OF SAID PIGMENT PARTICLES NON GREATER THAN ABOUT 1 MICRON IN DIAMETER WITH A WATER-MISCIBLE ORGANIC SOLVENT FOR ACRYLONITRILE POLYMERS WHICH IS CHEMICALLY INERT WITH RESPECT TO THE SAID PIGMENT AND POLYMERS AND WHICH HAS A BOILING POINT HIGHER THAN ABOUT 120*C., DISTILLING WATER FROM THE RESULTING DISPERSION UNTIL THE WATER CONTENT THEREOF IS REDUCED TO NOT MORE THAN THREE PERCENT WATER, BASED ON THE WEIGHT OF THE SAID ORGANIC SOLVENT, AND INCORPORATING THE RESULTING DISPERSION OF PIGMENT IN SAID ORGANIC SOLVENT IN A SOLUTION OF A POLYMER OF AT LEAST 85 PERCENT BY WEIGHT ACRYLONITRILE AND UP TO 15 PERCENT BY WEIGHT OF ANOTHER MONO-OLEFINIC COPOLYMERIZABLE MONOMER.
Claim 2
Dependent Claim 163 words
A PROCESS FOR PREPARING A SOLUTION OF A POLYMER OF AT LEAST 85 PERCENT BY WEIGHT ACRYLONITRILE AND UP TO 15 PERCENT OF ANOTHER MONOMER COPOLYMERIZABLE THEREWITH IN AN ORGANIC SOLVENT THEREFOR AND HAVING WATER-DISPERSIBLE PIGMENT PARTICLES NONE GREATER THAN ABOUT 1 MICRON IN DIAMETER DISPERSED THROUGHT SAID SOLUTION, WHICH COMPRISES MIXING AN AQUEOUS DISPERSION OF SAID PIGMENT PARTICLES NON GREATER THAN ABOUT 1 MICRON IN DIAMETER WITH A WATER-MISCIBLE ORGANIC SOLVENT FOR ACRYLONITRILE POLYMERS WHICH IS CHEMICALLY INERT WITH RESPECT TO THE SAID PIGMENT AND POLYMERS AND WHICH HAS A BOILING POINT HIGHER THAN ABOUT 120*C., DISTILLING WATER FROM THE RESULTING DISPERSION UNTIL THE WATER CONTENT THEREOF IS REDUCED TO NOT MORE THAN THREE PERCENT WATER, BASED ON THE WEIGHT OF THE SAID ORGANIC SOLVENT, AND INCORPORATING THE RESULTING DISPERSION OF PIGMENT IN SAID ORGANIC SOLVENT IN A SOLUTION OF A POLYMER OF AT LEAST 85 PERCENT BY WEIGHT ACRYLONITRILE AND UP TO 15 PERCENT BY WEIGHT OF ANOTHER MONO-OLEFINIC COPOLYMERIZABLE MONOMER.

References Cited (Backward Citations)

US1955825A Cited
US2271323A Cited
US2287416A Cited
US2692185A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1963-06-21 1963-12-21 1964-06-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1967-06-21 1967-12-21 1968-06-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1971-06-21 1971-12-21 1972-06-21 $7700.00 Window Closed / Lapsed

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