US1027616A - Solvent for acetyl cellulose. - Google Patents

Description

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No Drawing.

UNITED STATES PATENT OF ICE.

WILLIAM G. LINDSAY, OF NEW YORK, N. Y., ASSIGNOR TO THE CELLULOID COMPANY,

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OF NEW YORK, N; Y., A CORPORATION OF NEW JERSEY.

i To all whomz't may concern a citizen of the United States, residing in the city of New York, county of New York, State of New York, have invented certain new and useful Improvements in Solvents for .Acetyl Cellulose, of which the following is a specification.

The various compositions to which the plresent invention relates are employed in tie arts mainly as imitations of natural substances and consist of cellulose derivatives combined with or dissolved in certain other substances or menstrua, known as solvents and diluents. 1

Although the final or useful form of the different compounds isthat of a solid or dried material, the different processes of conversion into this final solid form involve, as is well understood, the employment of solutions or mixtures of varying consistencies as to plasticity, stiffness or fluidityj de endent generally on the proportion and liind of solvent'used to the amount of cellulose. J

There are two classes of solvents,liquid solvents, of which chloroform, epichlorhydrin and acetone are good examples; and it is possible to use my new solvent with what are known as solid solvents, such as camphor, for instance. The components of the mixed solvents may not necessarilybe possessed of individual solvent power. As an illustration, alcohol, which is practically a non-solvent in itself of nitro cellulose, forms a good solvent if either ether or camphor be mixed with it- The various applications of this important artrequire the employment of complex mixtures in the solvent,single substances being rarely used for such purposes. Hence, while the advancementof the art has, as is well known, depended largely on the discovery and application of -new* single solvent substances, it has required also the invention Bf combinations of solventsby which effects are produced quite different from those produced. when single solvents are employed alone.

Specification of Letters Patent.

creases.

Patented as 28,1912.

Application filed August 10, 1911. Serial No. 643,374.

ethylenechlorid is not a solvent of the ace- K tone-soluble variety of acetyl cellulose, it becomes such a solvent upon admixture either with ethyl or methyl alcohol.

As an illustration, I have discovered that a mixture of ethylenechlorid B. P. 83. 5 (1.

and methyl alcohol in the proportion of two I "half parts of methyl alcohol (by volume) and one part of ethylenechlorid (by volume) produces a mixture which is a valuable solvent for acetyl cellulose, but if the proportion of ethylenechlorid is increased beyond this amount-the solvent action de- Still again, I have found that a mixture of ethylenechlorid and ethyl alcohol in equal proportions forms an .efiicient solvent. But I do not limit myself to these specific proportions given in the above examples.

This newsolventmixture described herein can be used either alone or in conjunction with other solvent or non-solvent liquids or solids.

\Vhat I claim and desire to secure by Letters Patent is: y

1. As a new composition of matter, a solution of acetyl cellulose in a mixture of ethylenechlorid and alcohol, substantially as described.

2. A new composition of matter consisting of a solution of acetyl cellulose in a mixture of ethylenechlorid and alcohol (ethyl or methyl), combined with other solvents, substantially as described.

3. A new composition of matter consist ing of a solution of acetyl cellulose in a mixture of ethylenechlorid and alcohol (ethyl or methyl), combined with other solvents and inert or coloring matters and substances, substantially as described. I

VILLIAM G. LINDSAY.

Witnesses:

J. E. HiNDoN HYDE, Mania. DENTON.