US1045731A

US1045731A - Manufacture of threads, filaments, strips, or films of cellulose.

Info

Publication number: US1045731A
Application number: US65124911A
Authority: US
Inventors: Sidney Scrivener Napper
Original assignee: Samuel Courtauld and Co Ltd
Current assignee: Samuel Courtauld and Co Ltd
Priority date: 1911-09-25
Filing date: 1911-09-25
Publication date: 1912-11-26
Anticipated expiration: 1929-11-26

Description

. To all whom it may concern:

atman srn rnis rerun onnrc.

SIDNEY SCRIVENER NAPPER, OF COVENTRY, ENGLAND, ASSIGNOR T0 SAMUEL COURTAULJD & COMPANY LIMITED, 01 LONDON, ENGLAND.

MANIIFAGTURE 0F THREADS, FILAMENTS, STRIPS, 0R FILMS 0F CELLULOSE.

No Drawing.

Be it known that I, SIDNEY ScRIvENER NAPPER, a subject of the King of Great Britain and Ireland, of 7 Ellys road, Coventry,

in the county of Warwick, England, have invented new and useful Improvements in i Connection with the Manufacture of Threads,

Filaments, Strips, or Films of Cellulose, of which the following is aspecification. p The regeneration of cellulose hydrate in the form of threads, filaments, strips, or films, from viscose, has been, effected by forcing a suitable viscose 'through orifices, or apertures, into so-called setting baths, two different classes of. which baths have been used for the purpose-namely, class 1, a

bath such as an aqueous solution of ammonium sulfate, in which the viscose is precipitated as xanthate; class 2, a bath in which cellulose hydrate is regenerated from viscose by the action of the bath. A number of baths of this class 2, of difi'erent compositions, have been employed; Such baths may consist for example of dilute sulfuric acid alone, or with additional ingredients, for instance, (severally or jointly) salts of sulfuric acid, glucose, and the like.

The present invention consists in an improvement of the baths belonging to theaforesaid class 2 and results in superior products and in economy in working. The improvement consists in adding to a bath, such as those hereinbefore classified under 2, a small quantity of zinc salt, preferably "zinc sulfate, or of zinc, or a zinc compound,

which, by the action of the acid in the bath,

will be c0nverted into a zinc salt, and in the, 'use of such a bath for theregeneration of cellulose hydrate from viscose.

The lowing are examples of ways in which t new bath may be prepared, but I Specification of Letters Patent.

do not limit myself to the precise details of these examples. The parts are by weight.

Example: sulfuric acid, 81} parts; glu- 'cose, 9 parts; ammonium sulfate, 4 parts;

sodium sulfate, 12 parts; zinc sulfate, 1

part 5 .water, 65 parts.

Example 2: sulfuric acid, 8 parts; glucose, 10 parts; sodium sulfate, 12 parts; zinc sulfate, 1 part; water, 69 parts.

The proceedings for effecting the regeneration of cellulose hydrate from viscose by means of such a bath can be conducted in the usual well known way.

Although I have found that the quantity Patented Nov. 26, 1912.

Application filed September 25, 1911 Serial No. 651,249.

of zinc salt mentioned in the examples gives good results, I, as aforesaid, do not limit myself thereto, but I have found that the quantity of zinc salt added to, or formed in, the bath should not amount to much more than about'three per cent. of the weight of the bath.

What I claim is:

1. In the production of cellulose objects from viscose, the introduction of the latter in suitable form into an acid setting bath in the presence of a zinc salt in quantity not materially exceeding three per cent. by weight of the bath.

2. In the production of. cellulose ojectsfrom viscose, the introduction of the atter in suitable form into an acid setting bath containing a zinc salt 1n quantity not materially exceeding three per cent. by weight of the bath.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. Y

SIDNEY SCRI-VENER NAPPER. Witnesses: LEONARD P. WILSON,

FRANK SHEDDEN.