Merton L Davis

US Patent:

40715965, Jan 31, 1978

Filed:

Nov 22, 1976

Appl. No.:

5/743674

Inventors:

Merton Louis Davis - Camden SC

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

D01F 618

US Classification:

264168

Abstract:

High-shrinkage acrylonitrile polymer fibers that shrink with unusually high shrinkage force are prepared by a process in which as-spun, dry-spun filaments are extracted to remove solvent by passing the filaments continuously through aqueous baths at 63. degree. to 75. degree. C. , drawn between 1. 5X and 3. 5X during passage through the baths, and cooled to a temperature below 50. degree. C. while free of tension. The filaments are further drawn 1. 1X to 1. 5X while passing continuously through at least one aqueous bath at 70. degree. to 80. degree. C. and are then dried at a temperature no higher than 60. degree. C. The filaments may be crimped at 55. degree. to 65. degree. C. in a stuffer box prior to drying. The filaments may be cut to staple fibers for use in pile fabrics; they are particularly useful in preparing artificial furs.

US Patent:

40112942, Mar 8, 1977

Filed:

Jun 20, 1975

Appl. No.:

5/588610

Inventors:

Merton L. Davis - Camden SC

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

D01F 618

US Classification:

264206

Abstract:

High-shrinkage acrylonitrile polymer fibers that shrink with unusually high shrinkage force are prepared by a process in which as-spun, dry-spun filaments are extracted to remove solvent by passing the filaments continuously through aqueous baths at 63. degree. to 75. degree. C. , drawn between 1. 5X and 3. 5X during passage through the baths, and cooled to a temperature below 50. degree. C. If the filaments are cooled while free of tension, the filaments are further drawn 1. 1X to 1. 5X while passing continuously through at least one aqueous bath at 70. degree. to 80. degree. C. If the filaments are cooled under tension, the further drawing step is unnecessary. In either case the filaments are dried at a temperature no higher than 60. degree. C. The filaments may be crimped at 55. degree. to 65. degree. C. in a stuffer box prior to drying.

US Patent:

T9690018, Apr 4, 1978

Filed:

Oct 4, 1977

Appl. No.:

5/839319

Inventors:

Merton Louis Davis - Camden SC
Lee Oleh Dworjanyn - Augusta GA

International Classification:

D06P 100

US Classification:

8 25

Abstract:

synthetic organic fibers are dyed to a dark brown to black shade with a mixture of dyes, one of the dyes in the mixture being a green to blue dye having an absorption spectrum in which the peak value of absorbance is between 600 and 700 nanometers, said green to blue dye being further characterized in that the ratio of absorbance at 700 nanometers to the absorbance at the peak value between 600 and 700 nanometers is at least 0. 05. The presence of this green to blue dye reduces or eliminates transmittance of red light along the fiber axis, so that no reddish glow is seen when the ends of the fibers are observed. The dark brown to black fibers are thus well suited for use in artificial furs.