Patented en. 27, Egg 2,141,575 ' COWOSITIGN 0F MATTElt Harold Warp, Chicago, Ill. No Drawing. Application April 2, 1937, Serial No. 1345684 . 5 Claims. (Cl. 134-15) be evaporated to- leave the ?lm of- pliable rosin ' This invention relates to a composition of mat wax on the sheet material. I ter for coating sheet material such as paper, fab It is then an object of this invention to pro ric, wire screen. and they like to close up the pores rosin composition capable of forming , vide a or meshes thereof and to render the material im tough, ?exible, waterproof and translucent ?lms. ;, perforate and weatherproof. - i) ‘Another object of this invention isto render More speci?cally, this invention relates to a brittle rosin material pliable. ’ ,rosin-wax composition capable of forming a flex A further object of this invention is to pro ible, semi-transparent, weatherproof ?lm that vide a rosin-wax composition for ?lling up the transmits ultra-violet and infra-red light rays. meshes of reticular sheets. 10' ii) The invention is especially useful for prepar A further object of this invention is to pro- ing Window glass substitutes by coating reticular vide a rosin-micro-crystalline-wax composition material such as woven fabric or wire screens’ that admits ultra-violet and infra-red rays. therewith to close up the meshes of the mate Other and further objects of this invention will rial with a ?exible ?lm. The reticular, material become apparent to those skilled in the art from 15 is embedded in the ?lm and the resulting sheet is the following example illustrating a preferred ?exible, imperforate, weatherproof and‘ semi embodiment of the invention. ; transparent. The ability of the ?lm to trans Example.—2 parts of natural water-white gum ‘ mit ultra-violet and infra-red rays of the, sun rosin having a melting point of about 170° F. are makes the sheet material coated with the com melted together with 1 part of “micro-crystalline 2o 20 position highly desirable for use in hot-beds, para?in wax” having‘ a melting point of about chicken-coups, animal-pens, summer-porches 160° F. The molten mixture is stirred to pro and the like. > _ duce a homogeneous mass. ‘The ‘homogeneous ‘ The composition of this invention is a mixture mass is applied to reticular sheet material, such of plastic wax and rosin or a synthetic resin ma as for example, a wire screen, by dipping the 25 25 terial. The plastic wax is preferably “micro sheet into a molten bath of the composition pref crystalline paraffin wax” having a melting point erably maintained at temperatures of ‘250° F. or of from 140° to 165° F., atv present being sold by higher. The excess composition can be doctored National Wax Company of Chicago, Illinois. or scraped off of the dipped sheet. A layer of This “para?in wax” is micro-crystalline and is a desired thickness is thus obtained, preferably so 30 obtained ‘from petroleum without the addition of just sufficient to embed the wires in the layer. plasticizers. It‘ has materially higher melting The coated screen is allowed to cool‘, either by points than ordinary para?in wax and‘ is readily passing through water, or otherwise, to eifect distinguished by its plasticity even' at low tem solidi?cation of the rosin-wax composition. The ' 'peratures,v such as 32° F. The “micro-crystalline cooled product is a weatherproof, ?exible, semi- 35 35 para?in wax” is thus pliable at atmospheric tem- . transparent sheet having the wires of the screen peratures even ‘down to freezing temperatures ‘embedded in the composition. The ?lm of the and does not dry out or become brittle. The composition ?lls up the meshes of the screen and preferred rosin is natural water-white gum rosin having a melting point around 170° F. The two adheres to the screen wires with great tenacity. ’ materials are melted together and thoroughly The ?exible sheet thus produced admits ultra- 40 40 mixed in a molten stage. The molten mass is violet and infra-red’ rays and remains pliable at applied to the reticular sheet at temperatures all temperatures below its melting point. around 250° F. or higher. The mass upon solidi The composition of this invention is stable'and ?cation on the sheet material ?lls up the pores will not objectionably shrink, expand, oxidize, _ crystallize or ?ake o? when exposed to the ele- " ‘’ 45 or meshes of the sheet with a semi-transparent, form a flexible ultra-violet - highly ?exible ?lm to ments. 6 ' ' and infra-red. ray penetrable weatherproof sheet. It has heretofore been proposed to incorporate If desired the molten mass can be tinted or col oils or plasticizers into rosin materials to make ored by means of a dye such as an aniline dye. the same pliable. However these plasticizers 5'0 50 If transparency is not necessary, cheaper grades eventually . ‘evaporate, oxidize or lose their of wood or gum rosin can be used. strength when exposed to the weather leaving a The fused mass is soluble in solvents such as ' hard rosin base that will crack and powder off benzene, naphtha or alcohol and if desired can be of the reticular sheet.‘ The rosin-micro-crystal applied to the reticular material in solution form line-wax. composition of this invention, on-the 65 ' 55 in one of these solvents. The solvent can then 2 2,141,575 other hand, eliminates the disadvantages encoun group consisting of gum rosin, wood rosin, ester tered by mere plasticizing of rosin materials. gums, and alkyd type resins andvfrom 20 to 50 It is preferred to use from 20lto 50 parts of the percent-of micro-crystalline para?‘ln wax, said “micro-crystalline para?in wax” with 80 to 50 wax having a melting point of from 140° to 165° parts of natural gum or wood rosin. A mass com‘ F. and being plastic at temperatures as low as posed of 25 parts of the “micro-crystalline para 32° F. - I ?n wax” with '75 parts of natural gum rosin has 3. A plastic resinous wax composition of mat been found highly desirable. ter for closing the meshes of reticular material The compositions of this invention have low consisting of a homogeneous mixture of two melting points of from 140 to 180° F. parts of natural gum rosin and one part of In place of gum rosin or wood rosin, synthetic micro-crystalline paraffin wax, said wax having 10 resin material such as ester gums, alkyd type a melting point of from 140‘? to 165° F. and being resins and the like may be used. The coated, plastic at ordinary temperatures down to 32° F. reticular sheet material can betreated with a 4. A pliable resinous wax composition of mat 15 glycol or glycerin after cooling of the ?lm there ter for closing the meshes of reticular material 15 on to present a non-tacky, or non-adhesive sur— comprising 75 percent of a resin material selected face to the sheet. ' ‘ ' from the group consisting of gum rosin, wood If it is desired to tint or color the ?lm, aniline rosin,‘ ester gums, and alkyd type resins and 25 dyes can be used such as ordinary aniline colors percent of micro-crystalline plastic para?in wax, 20 ground in oil. If the aniline color does not mix said Wax having a melting point of from 140° 20 readily with the molten rosin-wax composition to 165° F. and-being plastic at ordinary tempera it can be preheated in molten stearic acid and tures down to 32° F. and said mixture adapted to poured slowly from this molten mixture into the form a ?exible infra-red and ultra-violet ray rosin-wax composition. The dye will then read penetrable ?lm. ‘ 25 ily color the composition. 5. A plastic resinous wax composition of mat 25 - I claim as my invention: ter comprising a pliable, stable, fused mass of 1. A plastic resinous wax composition of mat from 80 to 50 percent of natural rosin and from ter comprising a homogeneous mixture of from 20 to 50 percent of micro-crystalline plastic 80 to 50 percent of rosin and from 20 to 50 per paraffin Wax, said Wax having av melting point cent of micro-crystalline para?in wax, said wax from 140° to 165° F. and being plastic at ordinary 30 having a melting point of from 140° to 165° F. temperatures down to 32° F. and said composition . and being plastic at’ ordinary temperatures and having a melting point between 140-180° F. and _ down to 32° F. ‘adapted to close the meshes of reticular sheet 2. A plastic resinous wax composition of mat material with a ?exible ?lm thereof. ter comprising a homogeneous mixture of from 80 to 50 percent of a resin selected from the HAROLD WARP. .