Document ExVKn1Dvbyqx5ZY8vdv4jj24j

0007-SWP-00011 !2 i-4 H-i on ON -n .t)VAM 0W ^ AN a ml C 'tyecvu Chemists . lhoc resourceful peo perform near-miracles m transform wear, purifying the water we drink we breathe, improving the food we house.-, we live in, beUeitng the he lengthening the life we span . . momentous milestone this mont Chemical Society will mark its D a huge conclave of chemists from to be held ill New York Citv fro through September 13th Known as the World Chcmieal York City event will bring togethe contemporary names m chemist 13,01)0 chemists are expected to a tions from at least thirty-two foreign To point up the magnitude of thi portance to us all, the U. S. Post is issuing a special stamp this m Jubilee. We at Calco are happy to to a science and an industry which s iiulpriiihii-iii t. MAEliC44f . which ha ,'vjr. much m well-b . thro % 0007-SWP-000115739 Anyone who lies brushed against the sealed disruption of the film and powdery surface of the weathered another term, "Erosion," is applied paint on a house, or who has inad to describe both the rate and the vertently used his clothing to wipe depth to which deterioration has the surface of painted lawn furniture developed. Polishing of the film so as whose protective coating is starting to remove chalk and to reduce its to disintegrate, has developed first thickness until a smooth, unbroken hand contact with the phenomenon surface is obtained affords an index of chalking. Chalking is thus readily as to the depth to which chalking or identified with the tendency of dis erosion has penetrated. Thus chalk integrating pigmented coatings to ing becomes associated with the 111in shed portions of their pigment con rate of wear or service life. tent in the form of a dry powder If the chalking film is colored, or which resembles chalk, hence the tinted by admixture of color and name. white pigment, the reversion of the When pigmented protective coat pigment to the dry form produces a ings are formulated and manufac change in color impression so that tured, various types oforganic binders the surface appears faded, hence the are used to wet the pigments em term, "Fading." Thus mechanical ployed for decorative and protective fading of films is coincident with purposes. After these liquid coatings chalking. are applied they convert to films Paint formulatcirs employ tin: having the characteristics of a solid. extremes of resistance to chalking Such conversion takes place through breakdown in preparing coating com chemical and/or physical changes in positions for various consumer needs. the binder. However, when these Thus while house paints are designed films are subjected to the weathering to be relatively free-chalking since influence of temperature, solar energy a regulated, progressive him break and moisture, further changes take down provides the means of keeping place in the binder producing dete painted houses clean and pleasing in rioration or surface rupture of the appearance. On the other hand the film. The adhesion forces which bond protective enamelB on automobiles the pigment to the converted liquid are planned to be as chalk-resistant thus become dissipated and the pig as possible so as to give long service ment returns to a dry, un-wetted and maximum appearance when condition. washed or polished. The pigment Chalking is a phenomenon of the manufacturer, through research and outer surface of the film and proceeds application studies, constantly seeks in rate according tu the rapidity with to provide the range of pigment dur which the binder delcrioraies. Fast ability chararii-nslics ,1,-sucil by [In breakdown of the film produces deep- customer. B The first patent on record pertaining to the coloring of paper was issued in England m 1691. Holder was Nathaniel Cilford, who claimed it for "a new, better ami cheaper way of making all sods of hiur, purple and other colored paper.'* Th in Th br ar nu Waxes find their widest ue a* protective euatmgs lor Hows and auiumntjih** Our ul the mam sourco of wax is the carnanhu palm tree which grow* ut Brazil. Nature applies it to the leaves of the palin hi prevent the hot sun of the drv *eaon from drawing nut the moisture supply -.lured in the tree dm h ir the rum' V u mi's hurw'<*! Iumi five tiers iiMi.dh .iM Mitcs one pound >( So C lo la M fo ha .in ul 0007-SWP-047227 0007-SWP-000115740