Process for preparing acrylic polymer plexifilaments

Details Process for preparing acrylic polymer plexifilaments Process for preparing acrylic polymer plexifilaments

1978-12-29

1980-12-09

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

260 296AN, 264211, 525336, 525350, D01D 504

Patent

active

042384419

ABSTRACT:
A process for preparing acrylonitrile polymer plexifilamentary strands comprises dispersing in water 25 to 45% by weight of an acrylic polymer containing at least 91% by weight acrylonitrile units and up to 9% by weight of one or more copolymeric units and having an intrinsic viscosity of 0.6 to 2.0, 7 to 23 .mu.eq./g. enolizable groups after mild acid treatment, 15 to 70 .mu.eq./g. thioether ends derived from a water insoluble mercaptan and less than 3 .mu.eq./g. oxidizable hydrolysis fragments, heating the dispersion to a temperature of 200.degree. to 300.degree. C. while maintaining the dispersion under sufficient pressure to maintain the water in the liquid state, the time of heating not exceeding about 30 minutes, and promptly flash-extruding the dispersion through an orifice into a region of substantially lower temperature and pressure to form a continuous strand of filbrillated plexifilaments.

REFERENCES:
patent: 2434054 (1948-01-01), Roedel
patent: 3380949 (1968-04-01), Isley et al.
patent: 3448092 (1969-06-01), Chiang
patent: 3819762 (1974-06-01), Howe
patent: 3828013 (1974-08-01), Nield
patent: 3879360 (1975-04-01), Patvon et al.
patent: 3917553 (1975-11-01), Thompson
patent: 3984601 (1976-10-01), Blickenstaff
patent: 4004072 (1977-01-01), Tamura
patent: 4094948 (1978-06-01), Blickenstaff
Kirby et al., "Macromolecules" L, p. 53-58 (1968).

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