2,407,988 Patented Sept. 24, 1946 ,UNITED STATES PATENT " OFFICE 2,407,988 PROCESS FOR TREATING CELLULOSE MATTER WITH TERPENE DIHYDRO CHLORIDE Christopher Luckhaupt, Jamaica, N. Y., assign or to Luckite 'Processe s, Inc., Delawanna, N. J ., a corporation of New Jersey No Drawing. Application February 14, 1942. Serial No. 430,944 ,1 Claim. (Cl. mtg-143) . 2 1 . This invention relates to a method of process practically odorless and tasteless, and for this ing porous cellulosic materials and to the result-M . reason is .well ?tted for treating containers for ing product. . ’ packing foodstuffs. One of the objects‘ of my invention is the pro While the use of terpene dihydrochloride is of material advantage in many respects other than those above referred to, I might mention that pre vision of a process whereby porous cellulosic ma terials may be treated to increase or enhance the tensile strength, ?exural strength and com formed articles of porous cellulosic material may pressional strength thereof. Provision is made be \treated without warping, swelling or other also in the present invention for the incorpora wise distorting the preformed article. tion in the base treating material of certain sub 10 While terpene dihydrochloride in itself, as stances to be hereinafter referred to as “forti?ers”' above pointed out, is insoluble in water, the whereby the properties imparted to the porous waterproofness of a cellulose material processed cellulosic material by the base material are fur with, this base material may be further increased ther enhanced and‘ other properties incorpo by'adding forti?ers such as vegetable oils and 15 mineral oils, raw and blown, fatty acids. cetyl More speci?cally the present invention pro alcohol, etc. These forti?ers‘are added to the vides for the processing of porous cellulosic and heated terpene dihydrochloride. , kindred material whereby‘ the same becomes The cellulose being processed may be rendered waterproof, ?ameproof, oilproof and rotproof. I rated. Y ' - highly ?ameproof and ?re-resistant by adding to am also able to impart ‘hardness, strength and‘ 20 the meltedv dihydrochloride fo'rti?ers such as elasticity to the cellulosic material and to convert ,acetic acid, citric acid,_butyl phosphate, choles the same as well into a good electrical insulating terol, etc. material meeting all the requirements of the ?re . . It is sometimes desirable to prevent the oxida underwriters. ‘ U of the material processed and to prevent it Still moreyspeci?cally the present invention 25 tion from drying out and becoming brittle, and in provides for the treatment of porous cellulosic such event 'I add fortifiers‘ such as parachloro material and kindred material with terpene di phenol, diethyl phthalate, dimethyl' phthalate, hydrochloride C1oH1s.2HC1. This material is castor oil, etc. to the melted terpene dihydro made from limonene (C10H1s) in glacial acetic acid by HCl gas or from terpin and HCl gas. It is a white to yellowish white crystal melting at‘ _ 50° 0. (122°' F). It is insoluble in water and is practically odorless and tasteless. The cellulosic ‘ chloride. " ‘ The oilproofness of the processed material may be enhanced by the incorporation into the melted terpene dihydrochlor-ide of fortiflers such as cellulose acetate, glycerophosphate, etc. material may'be immersed in a hot bath of the Cellulose acetate also possesses the propertyof terpene dihydrochloride'in an open. container, the 35 increasing the hardness and strength of a cellu employment of vacuum or ‘pressure being un losic material processed in ‘accordance with my necessary to the successful practice of my inven invention. Forti?ers such as resin, indene resin, tion. ' The terpene dihydrochloride during proc etc. may be used also to increase the hardness of essing is kept at its melting temperature or the resulting product, while ethyl cellulose and higher. The period of immersion is“ dependent, 40 butyl cellulose are further examples of forti?ers of course, upon the degree of penetration desired, useful in increasing the strength of the resulting but in any event is only a matter of seconds. My invention may be practiced by spraying or by coating in an ordinary roller coating machine. product. ' ' t ' Where an increase in adhesiveness is desired, forti?ers such as‘ resin, indene resin, linseed oil, I ?nd that terpene dihydrochloride is particu 46 rape seed oil, etc. may be used. , . larly advantageous when treating porous cellu The cellulosic material, being processed may losic material containing low melting point ma‘ be rendered rot-proof by ‘the use of fortiflers terials which are to be preserved, in, that the _ such as‘ sodium ?uoride, dinitrophenol cromate, terpene dihydrochloride has a low melting point. etc., while the elasticity of the ?nished product is This fact too is of material advantage where ?ex 50 much enhanced by the incorporation of vegetable ibility of the processed material is to be pre and mineral oils. ‘ served, cellulosic material processed with ter Marked improvement is obtained in the insu pene dihydrochloride remaining, ?exible at. low _' temperatures. - My base material, terpene'dihydrochloride, is lation value of the processed cellulosic material‘, and an article produced capable of meeting theZ 1 ~ ?re underwriters’ requirements by adding for-ti ‘ . ' 2,467,9ae 3 being processed. ' I have found from a great many _ acetate and ethyl cellulose to the hot terpene di tests that the, i’ortitlers may vary in quantity hers ‘such as: chlorinated waxes, latex, cellulose hydrochloride. .from 2 to 75%" by weight of the terpene dihy _ droehloride. As a general rule the more iorti?er -I ?nd that articles of porous cellulosic mate employed‘ the greater the. degree of the characteristic orproperty of that particular forti?er im parted to the cellulosic material'or kindred ma rial processed in accordance with this invention have their pores and interstices ?lled with the treating material in solid form, leaving a smooth terial being processed. . . surface on the processed material. This surface It is to be understood that cellulose sheets, for need only be sanded to ?t the same for painting, shellacking, varnishing, etc., it such ?nishes are 10 example, may be processed and afterward fabri cated into any article desired, although. as above desired. Should it be desired to'coat as well as mentioned, there is‘ no change, shrinking or swell to impregnate the cellulosic material, this can be ing or warping of preformed articles processed in done by lowering the temperature of the treating accordance with my invention. ‘ ' The terpene dihydrochloride and forti?ers can material after initial processing. Porous celluloslc material and kindred mate 16 be added to comminuted cellulosic material so that the admixture may be employed as a mould ing powder. If a thermoplastic is desired then forti?ers such as cellulose acetate and triphenyl ' rials treated in accordance with this invention may be sawed, bored, planed and shaped without jagged edges or leased surfaces and without cracking or checking of the material. As above pointed out, the processing period 20 phosphate may be used. . If the powder is to ‘be thermo-setting then I suggest latex and sulphur. While I have described my invention with re!’ renece to certain forti?ers, etc., it is to be under stood that'changes and modi?cations may be made within the purview of my invention. varies with the degree of penetration desired. As a general rule the processing period depends upon the temperature of the treating material and the degree of penetration desired. In all cases, how ever, impregnation ls- almost instantaneous, be im; only a matter off a few seconds. What I claim is: _ The method which comprises impregnating _ I think it will be appreciated that it is not possible to name a speci?c amount of a given porous cellulosic material by immersing the same in a mixture of terpene dihydrochloride and-cel forti?er which must be employed in all cases. The ratio of forti?er to terpene dihydrochloride 30 lulose acetate heated to a temperature at or above the melting temperature of the terpene ' dihy necessarily varies over a wide range, and is de pendent upon thedegree to which a particular - characteristic is to be imparted to the material ' drochloride. CHRISTOPHER LUCKHAUPT.