Foamed synthetic fiber and its manufacturing method

Details Foamed synthetic fiber and its manufacturing method Foamed synthetic fiber and its manufacturing method

1987-08-10

1989-09-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

B29D 0000

Patent

active

048657867

ABSTRACT:
Disclosed is a foamed synthetic fiber characterized in that an organic solvent solution of a thermoplastic polymer admixed with 3-100 weight percent of a compound scarcely soluble or insoluble in the aqueous coagulating bath for wet spinning, which is liquid under normal pressure and has a boiling point of 120.degree. C. or less, as foaming agent is injected as spinning dope into said aqueous coagulating bath and it is foamed in a drying atmosphere at the boiling point or more of the foaming agent and 100.degree. C. or more and has an expansion ratio of 3 percent or more, and the manufacturing method thereof. The foamed synthetic fiber of the present invention is light and bulky, being excellent in warmth-keeping and heat-insulating performance with its appearance, touch and development of color similar to those of an animal hair.

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patent: 4515859 (1985-05-01), De Maria et al.
patent: 4544594 (1985-10-01), Li et al.

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