US1868787A - Process of manufacturing a composition containing matter of the character of caoutchouc - Google Patents

Description

' Patented July 26, 1932 nitas amass PATENT OFFICE] rrnmnicrr ZIEGNER, or HAGEN, GERMANY PROCESS OF MANUFACTURINGA COMPOSITION CONTAINING MATTER OF THE CHARACTER OF CAOUTCHOU G I No Drawing. Application filed April 1?, 1930, Serial No. 445,208, and in Germany April 25, 1929. i

My invention relates to improvements in the process of manufacturing a composition containing matter of the character of caoutchouc, and more particularly in the process 5 in which a composition is made from matter of the character of caoutchouc and a suitable filling material such as saw dust, the said composition being suitable for example as a substitute for linoleum. The object of the in improvements is to provide a composition which contains a high proportion of filling material, and with this object in View my invention consists in imbuingthe filling material such as saw dust with a suitablevliquid suchas gasoline adapted to cause swelling of the caoutchouc, mixing the filling material thus imbued with caoutchouc, a vulcanizing medium, and other suitable matter to be described hereinater, allowing vaporization of the liquid, and vulcanizing the matter under pressure sufficient to close the interstices prouced by vaporization of the liquid. I have found that by thus mixing the caoutchouc with the filling material having the said swell- 9 ing liquid absorbed the caoutchouc is made to swell, so that a very high proportion of filling material may be mixed therewith. v

In my copending application for porous bodies and'the process of manufacturing the same, filed November 17, 1927, Ser. No. 234:,- 028, I have described a process of manufacturing a porous body from caoutchouc and a filling material adapted to absorb a liquid such as gasoline capable of causing swell- 2 :3 ing of the caoutchouc, and my present process is distinguished from the process described in the said application in that high pressure is applied for closing the interstices produced by the evaporization of the gasoline, and that no water is added to the mixture. I In a modification of the process Iv add a suitable softening medium such as paraifin to the caoutchouc, in order to render the caoutchouc soft and fluent at elevated temperature, the result being that the caoutchouc is more readily compacted at vulcanizingr temperature and under high pressure, and that it is more intimately combined with the absorbing material.

When using the composition as a substitute filling media such as for linoleum Iapply the same to a suitable backing preferably made from fibre material.

In carrying out the process I may use the same ingredients which areus'ed in the manufacture offthe porousfbod'y described in'the ,55

said prior application. Thus I use'a filling material in the form of small particles or grains of porous material adapted to absorb the swelling medium, such for example as wood in the form of saw dust or meal, pumice, and the like. As a binding medium connecting the grains into a coherent mass I use substances of the character of rubber such for example as rubber, gutta percha', or

balata intermingled if desired with the usual facticeychalk, or lithopone'; j i In the manufacture of the body I'proceed as followsr I i 'lheporous grains are first imbued with a liquid such as gasoline capable of swelling the binding medium, whereupon they are rapidly mixed witha body of thecharacter of rubberhaving a suitable vulcanizingmedi- .um such as sulfur added thereto. In many 'zs cases the said rubber is used'in mixture with suitable filling matter such as lithopone, chalk or factice. The grains and rubber are intermingled by known methods, for example'bymeans of mixing rollers. I havefound that by first imbuing the grains with gasoline I or the like the mass of grains which canbe added to the rubber is largely increased as compared to aprocess inwhich the grains are not imbued with gasoline, because vthe. gasoline partly diffusinginto the rubber or the like causes the latterto swell, s0 that'the amount of rubber needed for'co'ating' the surfaces of the grains is considerably reduced as compared to the nonswollen rubber. By drying themixture the volatileswelling medium is vaporized, so that the body of rubber or the like is contracted, and the filmsof rubber coating the grains are torn and' partly separated from the grains. After thus drying thecomposition I subject the sameto vulcanization under high pressure, the pressure being sufficient to compact the'bodyand to close the interstices. I have foundthat for this purpose a pressure of 15 kilogrammes per square centimeter is sufiicient.

EwampZe.-To mixture of 100 parts. of rubber 7 parts of sulfur, 0,5 parts of an accelerator, 50 parts of lithopone, 75 parts of chalk, 200 parts of saw dust and 100 parts of gasoline are admixed on the rollers, the product being drawn out it desired on the calender into foils of any desired thickness, which :toils may be applied under pressure to a suitable backing such as a fabric of jute. The foils are dried for expelling the gasoline and vulcanized 4 hour in vulcanizing press between plates heated to about 160 C. at a pressure of about 15 kilogramn'ies per square centimeter.

In a modification of the process I add three parts of a suitable softening medium such as paratlin to this mixture in which case a pressure of 8 kilogranuncs per square centimeter is sufficient.

The product has not the character of rubher, but it is similar in its properties to leather or linoleum.

I claim:

1. The herein described process of manufacturing compact bodies, which consists in imbuing porous particles of fibre material with a medium adapted to swell matter of the character of rubber. intermingling the said porous particles with matter of the character of rubber and a vulcanizing medium, causing vaporization of the said swelling medium, and vulcanizing under pressure sulficient to close the interstices caused by the vaporization of the swelling medium.

2. The herein described process of manufacturing compact bodies, which consists in imbuing porous particles of fibre material with gasoline, intermingling the said porous particles with matter of the character of rubher and a vulcanizing medium. causing vaporization of the said gasoline, and vulcanizing under pressure suliicient to close the interstices caused by the vaporization of the gasoline.

3. The herein described process of manufacturing compact bodies, which consists in iimbuing porous particles of fibre material with a. medium adapted to swell matter of the character of rubber, intermingling the said porous particles with matter of the character of rubber, filling matter and a vulcanizing medium, causing vaporization of the said swelling medium, and vulcanizing under pressure sufficient to close the interstices caused by the vaporization of the swelling medium.

4. The herein described process of manufacturing compact bodies, which consists in imbuing porous particles of fibre material with a medium adapted to swell rubber, intermingling the said porous particles with rubher and a vulcanizing medium, causing vaporization of the said swelling medium, and

vulcanizing under pressure sufficient to close the interstices caused by the vaporization of the swelling medium.

5. The herein described process of manufacturing compact bodies, which consists in imbuing porous particles of fibre material with a medium adapted to swell matter of the character of rubber, intermingling the said porous particles with matter of the character of rubber, a softening medium and a vulcanizing medium, causing vaporization of the said swelling medium, and vulcanizing under pressure sufficient to close the interstices caused by the vaporization of the swelling medium.

6. The herein described process of manufactured compact bodies, which consists in imbuing porous particles of fibre material with a medium adapted to swell matter of the character of rubber, intermingling the said porous particles with matter of the character of rubber, paratfin and a vulcanizing medium, causing vaporization of the said swelling medium, and vulcanizing under pressure sutficient to close the interstices caused by the vaporization of the swelling medium.

In testimony whereof I hereunto aflix my si nature.

HEINRICH ZIEGNER.