Document OEVbdwx0vmxkpVbqKwvgekO7L

FILE NAME ICI ICI DATE 1974 Sept 10 DOC ICI019 DOCUMENT DESCRIPTION Patent 30-2005 11P FROM TO 14108894944 2/4 United . States Patent Office 3,835,074 Patented Sept. 10 1974 1 2 the 3,835,074 JOINT CEMENT COMPOSITIONS Castle covering within taped joints Most commercial formulations are following concentration ranges Calcium carbonate 190 to 350 parts by weight by Armand Incorporated assignor to Mica30 to 90 parts weight No , & 354,713 , to 100 weight IncoFlriedpCoostrIncorpataed Witlmingeton WdilmingtNon o. & Bin3d0e1r00 , . 44 parts weight U.S. CI 260-17 260-17 Claims If is as 3 the product to be sold a ready formulation the product amount about water of 30 to 40 based on the of the dry DISCLOSURE is added and ABSTRACT OF THE 10 total weight ingredientsingredients compositions Joint cements suitable for use with ly mixed All within limits just described plaster wallboard are suitable for manual application by troweling When binding impart water they are to be applied mechanically additional water is added the job site just prior to use replaced by a properties pseudoplasticity is at binding properties this lose fibrous hydroxyethyl cellu- 16 The cellulose derivatives which can be employed in in this invention are insoluble fibrous materials as rr eEuED distinguished from the conventional fibrous hydroxyethyl This invention relates to compositions useful cellulose of commerce which is soluble Water in- sealing sealing materials for the installation of as wallboard joint solubility is i.e. assured either by maintaining the M.S. at a low below about 1.2 or use of hydroxy- low ing in eg residential and office building panel- panel- construction 20 level i.e., by the specifically it refers to such compositions wherein ethylation techniques which produce a nonuniformly mb- a cellulose derivative is employed to impart desirable stituted product The water insolubility is a critical factor in the propertiesproperties thereto, performance of the hydroxyethyl cellulose as an asbestos substitute A soluble material such as con- Since the end of the second World War the use of interior has all but displaced plaster in crection of 25 ventional bydroxyethyl cellulose at economical concen- interior walls in the construction of buildings Wallboard tfroartion levels would not impart the consistency needed generally installed in 4 x 8 foot panels which are nailed and glued to the studding of the wall and flued the pseudoplasticity normally obtained with asbestos The above paragraph must not be taken to mean that Water natil the entire section of wall is covered Thteogether to water soluble hydroxyethylcellulosefrequently frequently employed is joints 30 Water bydroxyethyl cellulose as la limestone based frequently included inclinucluddeded thickener Covered with a joint coment or spackling compound which imperceptible hardheneirngheatrdoenfinogre wallpaper wallboard Juloseconetraion concentration the watear ter insolublehydroxyethylcel- bestos caenmpbleoyseadnded smooth so htahvaet othfe the hydroxyethyl cellulosbeeusined If the M.S. the may have is imperceptible under wallopr awpaellrpaper asbestos that need be water insoluble Joint coments 5 To duplicate properties of conventional joint contained a revinous binder limestone clay mica and concentration of cements wasabteesrtotso tfhoermprincipal ingredients which are mixed with oJfulotsheecaasnbestosfromabout an equalequal quantityquantity to that a dope Asbestos is included in these for- being mulations for several purposes It imparts lubricity work- of ability water binding and pseudoplasticity to the 40 hydroxyethyl cellulose is in the range of 0.15 to 0.6 the and being Abrous provides reinforcement of wet the mix concentration % based the range of % to on drying cement on the dry weight of the formulation Due ' the superior binding capacity of the cellulose to de- 46 concentration the additive which is effective can be of severcealrycirneosgtreincitcivceharacteristics hasprompted rivative having an M.S. in the range of 0.6 to 1.2 the of about issuance regulations by OSHA re- garding its use in construction applications 0.5 to formulation 1.5 based on the total dry weight of the Thus the concentration of the additive can be about 0.5 to % based on the total dry weight of the formulation Employing conventional joint cement the additional 50 weight of asbestos not replaced by recipes cellulose derivative is replaced by additional limestone the total or mica suggested As previouslypriotduisctimrpeomratiannstthtehastatmhee hy 6s fiber should water is added the time of use dry powder whichmica clay and limestone as major dorny the length cdroomxpyoentheynltscelalluolnogse whiatvhina g afnibMr.oSus. insoluble by- and 1.4 Joint between about 0.15 ready cements form f.o. are maketed in fully formulated binding capacity of the a to already containing water and as 60 fcient to reproduce hydroxyethyl the cellulose is pol suf- The at cements properties of conventional joint invention includes auch dry powders as well as the fully formulated cements Joint compositions of this invention are substantially identical in to those which are presently available performance based on current price levels they are competitive in commercially and composition In some cases the hydroxethyl cellulose alone the sufficient body can give of the In commercial practice the cipal ingredients can and concentrations of the prindo vary widely between sup- 70 structure additives of this type are added they normally replace a portion of one mica or clay inert fillers L.e. limestone 30-2005 11P FROM TO 14108894944 3/4 8,835,074 The resinous binder is normally a coalescable viny material preferably vinyl acetate which upon drying or curing of the cement form a thin nutrix to hold the clay limestone etc. When a fully formulated mix is 4 The latex binder was a 55 by weight aqueous disper- sion of vinyl acetate containing a plasticizer The dispersant was a polymerized sodium salt of a milfoniu acid sold under the trade name Daxad 30. The defoamer being prepared the binder is usually added us aques latex In the was n silica dispersion in a hydrocarbon solvent The case of dry mixes it is added as spray dried latex particles Other materials useful as the binder in- preservative was a mercurial fungicide compound clude e.g. starch casein polyacrylamide and copolymers Examples 1 to 11 of acrylamide and acrylic acid In addition to the principal ingredients mentioned The procedure and the formulation set forth for the above a typical joint cement will frequently also contain 10 control example were repeated using the following insol- a a a uble hydroxyethyl cellulose modifications in place of as- small amount of dispersant defoamer preserva- tive and a thickener a bestos The fnc fluffy Abers are all within the 0.03 to In the following examples the invention is 0.007 in range they passed through a mcsh Parts and percentages are by weight unless otherilwliussetriantdeid- screen and were held on mesh cated The following general procedure was employed to 15 the ingredients Example 1 mix mix preparing a readyready mix fofrmourlamtuiolnation tthhee and waterand Asbestos was replaced with 48 grams of hydroxyethyl binder latex were charged to mixing apparatus and a cellulose baving M.S. 0.32 in the form of fine Auffy fibers mixed for a short time before the dispersunt having water retention power of 10 g./g and preservative were added The dry ingredients lime- stone mica clay hydroxyethyl cellulose and structure Example 2 additives if used were dry blended and added incre- Asbestos was replaced with 48 grams of hydroxyethyl to ingredients of cellulose having M.S. of 0.4 in the form of fine mentalilngyredients wtahse asdtidrerded tlhieqmuiixd wAfatsersttihreredlafsotr shotuhet danr-y fibers having water retention power of 10 g./g other 10 minutes at low speed with occasional stopping '* To characterize prepared products prepared products the following tests were used in the examplexaempless VISCOSITY Example 3 of Asboalas was replaced with 24 parts of limestone and 24 parts of hydroxyethyl cellulose having MS 0.4 in the form of finec fluffy fibers having water retention power of 10 8./8 Twihteh pacnuerlrsenwteorfe atihrefnroamllowedintcohdorsycilolvaetrionnigfhatn ifnorced assigned Measured in Brabender units B.U. determined by Example 4 ASTM 474-67 Sections 2 and 3 Asbestos was replaced with 44 parts of limestone and CRACKING 4 parts of hydroxyethyl cellulose baving M.S. of 0.82 in 35 the form of fine fluffy fibers baving water retention power Panels were dried in an essentially verlicul position of 19 g.18 a a 14 Example 5 across their face from about 30 inches for 45 minutes Asbestos was replaced with 40 parts of limestone and vertical position without the air the 40 8 parts of hydroxyethyl cellulose having M.S. of 0.82 in current Ratings were subjectively as none N the form of fine Huffy Abers having water retention power alight S moderate M or heavy very slight H V.S. of 19 g- Exemple 6 DOWN about " " edges down was Panels was observed were cast Excelent with observed as saagt the edge ofsthe of cast panel is Ratings sharp Excellent structure with Excelent retained edges Slight Edges of panel are rounded Moderate Edges are slightly more rounded Poor Edges of panel are smooth and tapered panels slightly ADHESION 45 Asbestos was replaced with 40 parts of limestone and 8 parts of hydroxyethyl cellulose having M.S of 0.78 in the form of fine fluffy fibers having water retention of 15 g./8 power Example 7 Asbestos was replaced with 42 parts of limestone and 6 parts of hydroxyethyl cellulose having M.S. of 0.78 in the form of fine fully fibers having water retention of 18 g./g power By ASTM test C 474-67 Example 8 CONTROL EXAMPLE This control example in intended to illustrate the erties of a conventional joint cement employing propasbestos as a water retention aid The following standard joint cement formulation was prepared using the procedures set forth . Limestone 98 CaCO Mica 325 mesh Parts Parts 76 Latex binderbinder 76 Dispersant 4 Preservative 0.2 Defoamer 280 Hydroxyethyl ' cellulose 4.6 Asbestos 5-1000 2 49 aqueoussoluble % grudo M.B. 2,0 2000 epn viscosity in Asbeston was replaced with 42.7 parts of limestone and 5.3 of hydroxyethyl cellulose having 0.88 M.S. in the form of fine fluffy fibers having water retention of 20 g./B power 60 Example 9 Asbestos replaced by 40 parts of limestone and 8 of hydroxyethyl cellulose having an M.S. of 0.81 parts in the of 19 g./fgine fluffy fibers having water retention power Example 10 having Asbestos replaced by 48 parts of hydroxyethyl cellulose ao M.S. of 0.82 in the form of fine fluffy fibers having water retention power of 19 g./g 70 Example 11 Arbenlos replaced by 48 parts of hydroxyethyl cellulose having an M.S. of 0.15 having water retention 58.18 58.18 prepared by fibrillation of a power of fibers greater than 0.033 in pressed sheet into 30-2005 12P FROM TO 14108894944 4/4 S 3,835,074 following amples through The properties 1 1o1f tahreearbeocvoerdCeodntirnotlheExample and Extable 6 and very slight consistencyconsistencyexbibietxebdibited slightcracking down slight melt- 1280 1280 12.8 ...... ...... 600 viscous sere neovene Bmooth Do. viscous Do. Satisfactory Examples 12-17 Example 18 Using the recipe set out above additional joint cement The following ingredients were dry mixed by tumbling compositions were prepared in which some of the asbes- toa was replacweitdh a mixture of low M.S. bydroxyethyl cellulose acicular attapulgite clay and talc and the re- 20 Limestone Mica 10 Parts 29 76 mainder with additional limestone 76 25 HSydprorxyaetyhyl of water 0.82 poly vinyl solution Hydroxyethylcellulose 3 Example 12 Hydroxyethyl cellulose # 2 One part of bydroxyethyl cellulose having 0.82 M.S. 2 parts clay and 4 parts talc Product was slightly grainy 30 but exhibited only slight cracking and excellent melt- . dried acetate later Abers 0.08 34 2.5 4 water retention of down Example 13 was then mixed again to a uniform uated as in the previous examples cRoenssuilsttsenwceyraenadsevfaoll-- One part hydroxyethyl cellulose having 0.41 M.S. 2 Viscosity parts clay and 9 parts tale Product had smooth creamy consistency and exhibited only moderate cracking and Cracking 40 slight down down 40 Adhesion Example 14 Appearance 560 N. V.S. Satisfactory Smooth parts clay and 9 parts talc Product had smooth creamy 45 1. consistency and exhibited no cracking and slight meltdown arica joint cement composition consisting casentially of Example 15 One part bydroxyethyl cellulose having 0:63 M.S. 2 parts clay and 9 parts tale Product had smooth creamy consistency exhibited no cracking and slight down Example 16 ethyl cellulose compositon hydroxyethyl hydroxyethyl celluloseis 0.6 compsiton the a M.S.M.S. of about 0.15 to a concentration of about 1 to % One part bydroxyethyl cellulose having 0.8 M.S. 2 parts clay and 9 parts tale Product had amooth creamy slightly more viscous consistency exhibited no and very slight down cracking Example 17 References Cited UNITED 5/1968 11/1968 7/1962 12/1957 STATES PATENTS Henkel wa ac emee en2e60-17 Gogek CANTO217 CANTO217 106-214 106-214 Segro Yourtes 260-39 R Yourtes .. 260-15 One part hydroxyethyl cellulose having 0.82 M.S. 1.2 65 THEODORE MORRIS Primary Examiner parts clay and 52 parts talc Product had smooth creamy 106141 U.S. CI X.R.