FR2458623A1 - RUBBER FELT FOR FLOOR, WITHOUT ASBESTOS - Google Patents

Abstract

THE FELT FOR FLOORING ACCORDING TO THE INVENTION COMPRISES, IN PARTS BY WEIGHT FOR 100 PARTS OF THE TOTAL WEIGHT OF FIBERS AND FILLERS, FROM APPROXIMATELY 1 TO APPROXIMATELY 10 PARTS OF GLASS FIBERS, FROM APPROXIMATELY 2 TO 20 PARTS OF CELLULOSIC PASTE; FROM APPROXIMATELY 1 TO APPROXIMATELY 20 PARTS OF FIBRILLATED SYNTHETIC FIBERS; FROM APPROXIMATELY 50 TO APPROXIMATELY 96 PARTS OF AT LEAST ONE INORGANIC LOAD; AND ABOUT 10A APPROXIMATELY 40 ADDITIONAL PARTS OF A BINDER.

Description

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  The present invention relates to rubberized felt having no asbestos. More specifically, the invention relates to rubberized, asbestos-free felts prepared in water, saturated

  drummer, which are dimensionally stable and in

  sequence are suitable for use as sheets of

  felt forcing for resilient floors.

  Asbestos-containing rubber felts are well known and have enjoyed unprecedented commercial success in the resilient flooring industry.

  form of reinforcement sheets or foundation for

  decorative floor elements. These asbestos-containing rubber felts are produced by saturating asbestos fibers with a rubber latex in an aqueous system,

  threshing and shaping the felt produced on a

  classic papermaking machine. See, for example, US Pat. Nos. 2,375,245, 2,613,190 and 2,759,813. The commercial success of these asbestos-containing rubberized felts has been primarily due to the physical and chemical properties conferred on them. felt by asbestos fibers. Asbestos fibers alone facilitate the production of felts that can be

  easily processed, are dimensionally stable, pre-

  have excellent tensile strength when hot and are resistant to alkalis, moisture and microorganisms. There is no known individual fibrous material that can replace asbestos fibers in floor felts and can give felt having acceptable properties, in particular dimensional stability and tensile strength.

hot.

  The health hazards of using asbestos fibers are well known and, as a result,

  the flooring industry has been looking for

  long time replacement felts that do not contain

  They do not have asbestos fibers, but they provide practically the same physical and chemical properties as the asbestos-containing rubber felts of the known art. It is particularly important, and so is the need for a better understanding of the situation in the world. in Tessa, lV jamnos uo, l TS '(anaSiel el ap sues) aulqoem Iesaasueaz sues Ial suep Mo Cz x wMo 5Z ep suollp -ueqOv sap' aekessa g alna; al suep adnoDpp u0 agale azTpTmnq aun, p aeuesqid ue aelauuoTsuemip 9a Ss Tqess ap gsTlemaou Tessa, p aaozlagdo apow ns zuamwao; uoo slessa sap q zawnos al uo, nbsaol (znae2el Sl ap suas) eulqD -eU TesaaAsu su suT suTom no z Oz'o + 'eDuaz9.Xad ap'4ae sujou no% 0u'0 + ap uolieeolTp el V sanp SUOjeae -jT; pow sap aauesqad aaqoueld ap quamalaai ap aina; al anb or al; iu2Ts, allauuoTsuamTp aTlls, uoTssadxa, it 'uopdTia -sap aiuasked the suep aegsTlin its allaenb ellal Tolaqoueld inod squem -algaae ap uoTponpozd ap uolesliln, lg gTadoaddeuT Sues9 ammoo (ana2ael el ap suas) (euI4Dlem ars) TesaaAsueUz sues Z al suep 0toc '0 + ap uopleOT; lpom sun aquasgad Inb amana; an ubiquitous ua ua ua ua ua ua ue ua ue ua ue ua ue ua ua ua ua ue ua ua ua ue ua ua ue ua ua ua ua ua ua ua ua ua ua ubbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb; aanDoid the snssap-To salemqqo oZ sal apnospa ap Sawmad uolluaauT aluasgid éI * Àaqoueld apquamaia ael suep sa2essTId sap no sueamalopuo2 sap V alnpuoD Issne inadoeqluep aaeD * sgdnozgp seujoo salqrnop xne 'eainag al Deae luepTou oo; s2eaoDgp; 3aom a, puolSiozSTp aunvlll uoPlielTp alae aa aieTs as if it apqlmqqs a kind of a ua aa ua ale ua ale ue ee ssael ee sszol uoefllelsuT asae zuepuaj * uoTelTeIsuJ, l inod laluessa amulqoad a aniTsuoa uoileeliTp alaeDa aenDueTd ap zuam -alaaaa ael noi ap uoleze lp el 1sule lueslnpoad ua gaTPTm -nql q, sodxa Isa IT, nbsaol aielup as It 'alqeis zuemallau 01 uolsuemap sed sae, u elaqueld anod eainag a ts * sanbTsseIo' sanbpselq saeMqoueld ep sluamalaam ap luamailsea ap seanaemgdwal xne south aaslsga il il pneqo t UOTioeai el q eaouezsTsqa auuoq sun sed aeuasgad au aaqDueld anod amana; a S S pena x UOTIDaea el qaDouisis ausaqqa ajuesqid the elqeis zuema -.auuoTsuamlp Ios maqaueld.nod luamaDeldmam ap amane; al anb smaqzueld mnod xnmTalem sap a; ZosnpuT, l suep anbpzlao úZ98StZ

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  cutting direction is not important. Each sample

  The test is individually tested as follows:

  Conditions of the dimensional stability test

  in the presence of high humidity

  (1) Place the sample in a circulating oven

  air and heated for 6 hours at 80C.

  (2) Remove the sample from the oven and

  chills in a desiccator on CaCI2 for 1/2 hour

at 23C.

  (3) Remove the sample from the desiccator and

  measure the distance between two reference points (dis-

  initial tense) accurately to within 2.54 x 103cm.

  (4) The sample is then placed in a humidity oven and heated for 24 hours at 38 ° C. and at a relative humidity of 90 °. (5) The sample is removed from the oven and cooled in a desiccator during 1/2 hour on water. (6) The sample is removed from the desiccator and the distance (final distance) is measured again

  accurate to 2.54 x 103cm and we deduce the initial distance

  the final distance so as to obtain the modification

cation of dimensions in cm.

  Divide the difference in the resulting cm by the initial distance in cm and multiply by 100 for

  get the percentage change for each sample

  lon. The percentage change of the two samples is averaged so as to obtain the dimensional change in the width direction which constitutes the unit of measurement of the dimensional stability. We refer to

  Federal Standard 501a, Process 6211, (US Standard

  United States of America) incorporated in this description by

  reference. The present invention relates to a felt for floor covering, rubberized, without asbestos,

  prepared in water, saturated by threshing which is dimension-

  nally stable, this felt being produced by removing water from an aqueous preparation composition comprising glass fibers, cellulose pulp,

  polyolefin fibrils, at least one inor-

  a binder consisting of a synthetic rubber,

  a soluble salt taken from the group consisting of aluminum salts

  ferric salts and stannic salts and a sufficient amount of an alkaline hydroxide to obtain a pH of the preparation composition of from about 6 to about 12, the alkali metal hydroxide being used to convert

  the salt soluble in a hydroxide insoluble in water.

  In addition, the subject of the present invention is

  a surface coating comprising (a) a coating felt

  rubber-free, asbestos-free, water-saturated, threshing-saturated, dimensionally stable

  and produced by removing water from a prewarming composition

  aqueous composition comprising glass fibers, cellulosic pulp, polyolefin fibrils, at least one

  inorganic filler, a binder made of synthetic rubber

  a soluble salt selected from the group consisting of aluminum salts, ferric salts, stannic salts and a sufficient amount of an alkaline hydroxide to obtain a pH of the composition of from about 6 to about 10; alkali hydroxide for converting the soluble salt into a water insoluble hydroxide and (b) a decorative wear surface

  floor covering, rubberized.

  In its preferred form, the prepa-

  aqueous solution also comprises a resin for

  wet strength used in the manufacture of paper and a latex antioxidant. Optionally, the

  aqueous preparation composition may contain

  retention agents, biocidal agents and similar products. The aqueous preparation composition contains from about 1 to about 10 parts by weight of

  cut glass, superficially treated, for 100

  of the total weight of fibers and fillers. Fibers

  appropriate glass have nominal lengths of fiber

  between about 0.16 cm and about 1.25 cm and dia-

  meters of nominal fiber between approximately 5.1 x 10 4

cm and about 12.7 x 10 4cm.

  two types of cut glass fiber are particularly suitable for the company

2458623

  so-called "Owens-Corning Fiberglas Corporation" as 0.32 cm glass fiber "D-E 636" and fiberglass

"D-E 670- 8" 0.32 cm.

  The aqueous preparation composition may

  from about 2 to about 20 parts by weight of cellulosic pulp per 100 parts of the total weight of fibers and

  loads. According to the invention, for the purpose of

  To finish the quantities of ingredients, cellulosic paste is considered as a fibrous ingredient. Any suitable cellulosic pulp may be used, including bleached and unbleached sulphite pulp, conifer paste, kraft pulp, newspaper paste.

  or mechanical pulp and the like. A cellulose pasta

  Particularly suitable is the "non-blaachie sulfite paste" available from "ITT Rayonier".

(United States of America).

  Polyolefin fibers can be used

  any appropriate briolech in an amount

  between one and about 20 parts by weight of

  olefin per 100 parts of the total weight of fibers and

  loads. As particular fibrillated polyolefin fibers,

  appropriate, we can mention the fibers of

  fibrillated polyethylene and polypropylene fibers

brillieso

  A particular fibrous polyethylene fiber

  "Fybrel E-620" is found at the company "Crown Zellerbach" .The fibers 'Pyrbrel E-620' have an average length of 1.3 mm as measured in

  a Bauer-cnett binder and a drip factor of 6

  counts / gram. The dewatering factor is equal to the dewatering rate of a 10 g sample measured in one form.

  manual corresponding to the British standard, and is

even in seconds per gram.

  As other fibrillated polyolefin fibers which are suitable for use according to the invention, mention may be made of "Fybrel E-400, E600, E-780 and E-790 and R-830", all of these products being commercially available from the company "Crown Zellerbach", grades A and D of "Pulplex E", both products being available from

  "Hercules, Inc." and AD grade, "Pulplex P", a polypro-

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  fibrillated pylene also available from Hercules, Inc. The aqueous preparation composition will contain at least one inorganic filler present in an amount of from about 50 to 96 parts by weight of total inorganic filler per 100 parts of the total weight of fibers and fillers. The inorganic filler is selected from the group consisting of paper clay, wollastonite, talc, calcium carbonate, mica, pyrophyllite

and infusorial lands.

  Particularly suitable fillers include wollastonite of grade P-4, P-1 or Cl, all of which are available from "Interpace Co" and kaolin clays referred to as "highly opaque clay", which can available from "Freeport Kaolin Clay Co" and "Klondyke" clay or "Klondyke KIW" clay, both products available from Engelhart Minerals &

  Chemicals Corp. "Pyrophyllite is an aluminum silicate

  Nium hydrate and can be obtained under the trade name "Pyrax" from R. T. Vanderbilt Company, Inc.

  The aqueous preparation composition may contain

  from about 10 to about 40 parts by weight of a synthetic rubber latex per 100 parts of the total weight of fibers and fillers. Any synthetic rubber latex may be used, including styrene / butadiene latexes, carboxylated styrene latex / butadiene, the

  polychloroprenes, carboxylated polychloroprenes, terpenes

  vinylpyridene / styrene / butadiene polymers and similar products. Carboxylated styrene / butadiene latices are

  particularly suitable for use according to the invention.

  one of these products being designated "Dylex 1187", this product being commercially available from "Arco Polymers, Inc.", a subsidiary of "Atlantic Richfield Company". The product "Dylex 1187" has a content

  solids content of about 44 to 50% by weight, a

  taken between 9 and 10, a surface tension of between 60 and 70 dynes / cm, a Brookfield viscosity between

1 and 300 and it weighs 1,00 kg / liter.

  The aqueous preparation composition preferably contains from about 0.02 to about 2 parts by weight of a conventional papermaking resin conferring

7 2458623

  wet strength, per 100 parts of the total weight of fibers and fillers. As resistance resins

  particularly appropriate wet conditions, it is possible to

  the products designated "Kymene 2064" and Kymene 557 H ", both of which are commercially available from" Hercules. The product "Kymene 2064" and the product "Kymene 557 H" are aqueous product solutions.

  addition of cationic amino polymer and epichlorohydrin

  drine. The aqueous preparation composition preferably contains from about 0.2 to about 1.6 parts by weight of a latex antioxidant per 100 parts of the total weight

  fibers and loads. As a particular latex antioxidant

  appropriately, the named product may be mentioned

  "Flectol I" available from Monsanto Indus-

  trial Chemicals Company "The product" Flectol R "is of the

  2,2,4-trimethyl-1,2-dihydroquinoline polymerized.

  The following nonlimiting examples describe the preparation of the floor felts, rubberized,

  without dimensionally stable

vention.

EXAMPLE 1

  This mixing procedure is based on the preparation of an aqueous composition using the following ingredients. All amounts of ingredients are in parts per 100 parts of total fiber weight

and charge.

  In a mixing container containing about 300 cc of tap water, the total amounts are added

  fiberglass, fibrillated polyethylene, cellulose pulp

  losic, charge and antioxidant. The contents of the mixing vessel are suspended for a period of time

  between 0.5 seconds and 1 minute to ensure

complete ingredients.

  The suspension is then diluted with water

  binet at a temperature of about 24'C to a total volume of

  2.3 liters with a consistency of 2% and mixed with

  homogeneous using air agitation.

  To the resulting homogeneous mixture is added

  total strength of wet strength resin in agglutination

for about a minute.

  Then the total amount of aluminum sulfate is added with stirring for about 2 minutes, then

  add ammonium hydroxide to a pH of the suspension.

QUANTITY INGREDIENTS

  Fiberglass (Owens-Corning Fiberglas DE 636 0.32 cm) 2.25 Fibrous polyethylene ("Fybrel E-62P") 2.75 Cellulosic pulp: Unbleached sulphite pulp (ITT Rayonier) 7.5 coniferous pine ("Westvaco") 2, 5 Loads: wollastonite (P-4) 60 Clay (highly opaque) Total 100 antioxidant (Flectol H) 0.4 resin for wet strength (Kymene 557H) 0.4 latex synthetic rubber (Dylex 1187) 17 aluminum sulphate 7.65 i.li

_________________ - I

  S9ci mnfTuplumle, p 2:; inS uv L 9 (L II xeiq) enbTpzqzuus onoqoznoea ap xa: zl ú O ("9oZ aua" uX) apTwnq :: l :: I aDuv: sTsgl: nod auTsnl S 'O (lH 1lo3old ): usp'xotuv S 001 Ie: OT SL '6 Z (aO, (puo1x) allTav çS (lD): lTUO SoITOM: sesavtL: (OOeAISS> I) saej; JTuoo op aGl 0C 8 Ieuano ateldad ap ajUc: anbTsolnllao a : wa L z (oZ9-2g ieaq4) 911FqT in the XqjqXod cir (mD W '(O ap 9-OL9-3-G seal2aqil ZuTu: o-suaemO) a: eaA ap sa: q7j xJiJ. Nyflb J SL3INIRU3ONI esa2awqo ap la q I ap ap ap ap ap 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 9 uoTAuaep aSeapueleo sQide anassTedp aun * euassd ITnb asoesuoa uo the ealnag al eTesse uo eanbisesi aeIlqould op luam -elgAaa mmoa uoJ3SJllTnfle pladoadde 'UOpUaAUTlI e emao -uoo pnoqo2noeo aaqoueld ap luamalnaa ap aznaej unsp amzog snos sazuellnsu a saqqos sallTna; sasl ead n D 0 0 0 0 0----------------------------P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P; el apTnq lesi gsole emTid -moz U1 'sme1ll1M anbTssepI sallTnei Spalnom a lslllln ua aa llna; sun ua eluellnsu al # d el siole auuo5w; uo * ueflTnsae aizna; np lueTl mmouo S ae luaoelnoou, p aTselitxns amoo jueûas the sauleqo sae the seaqlj salt ans uwsodep es xasul av 'xeael np uoplzudTozad T, nbsn selnuim S UOITIS luellSe ua enbTiqquús onoqoInoeo ap xael ap eluloi pi; uenb el saole eano [e uo * In a mixing vessel containing about 300 cc, the total amount of glass fiber, fibrous polyethylene fiber, fillers and antioxidant is added. The contents of the container are suspended

  mixture for a period of time

  mute and one minute to ensure complete dispersion of the ingredients. The suspension is then diluted with tap water at a temperature of about 24 ° C. to a total volume of 2.5 ° C.

  liters and with a consistency of 2 Z and one mixes

  homogeneous using air agitation.

  To the resulting homogeneous mixture, the quantity

  total strength of wet strength resin with stirring

for about a minute.

  Then the total amount of aluminum sulphate is added with stirring for about 2 minutes, then ammonium hydroxide is added to obtain a pH value.

  from about 7 to 7.5 of the suspension.

  The total amount of synthetic rubber latex is then added with stirring for about 5 minutes until precipitation of the latex which is deposited on the fibers and fillers thus serving as a flow adjuvant.

  and as a binder of the resulting felt.

  The resulting paste is then processed into a sheet using a conventional Williams leaf mold. Da then compresses the resulting leaf wet to remove excess water and dries on

  a drum at a temperature of about 110 ° C.

  The resulting dried leaf is recovered under

  form of a rubberized floor covering felt

  form of the invention, suitable for use as a coating

  resilient floors. we examine the felt and we

  finds that it has a thickness of about 0.062 cm.

EXAMPLE III

  The same procedure as in Example II is used, and a reading is made of the following ingredients: procedure

sheet in use

) 2.75 31.25 0.5 0.5 7.65

INGREDIENTS

  Glass Fibers (Owens-Corning Fiberglas DE 670-8 0.32 cm) Fibrillated Polyethylene (Fybrel E-620 Cellulose Paste: Pulp of Newspaper Coniferous Pulp (Westvaco) Charges: Clay (Klondyke) Total Antioxidant (Flectol-H ) Resin for wet strength (Kymene 2064) Synthetic rubber latex (Dylex 1187) Aluminum sulphate The resulting sheet is recovered in the form of a rubberized floor covering felt according to the invention. to be used as a soft floor covering.

  has a thickness of about 0.06 cm.

EXAMPLE IV

  The same procedure is used

  than that of Example II and a sheet comprising

  both the following ingredients: 'll

QUAWITES

QUANTITY INGREDIENTS

  Glass Fibers (Owens-Corning Fiberglas DE 670-8 0.32 cm) 1.67 Fibrous Polyethylene (Fybrel E-620) 2.75 Cellulosic Pulp: $ Newsprint Pulp 8 Coniferous Pate (Westvaco) 2 Charges: wollastonite (Cl) 55 clay (Klondyke) 30.58 Total 100 antioxidant (Flectol H) 0.5 resin for wet strength (Kymene 2064) 0.5 synthetic rubber latex (Dylex 1187) 17 sulfate Aluminum 7.65 The resulting sheet is recovered in the form of a rubberized floor covering felt according to the invention suitable for use in soft floor coverings. We examine the felt and we notice

  it has a thickness of about 0.063 cm.

  /.1 or 0u -MI o90'O uoasuaup anssTsed9 aun S3uas -pad IS, nb aeloeuoo uo the as3nae to UTmeuxe UO aldnos aaqDueld ap zuamazAaa ammoa uotissTlTin, [e gladoidde 'uopueAul y am * oguoa gnoqoznoeo zaqoueld ap zuamaleAe op aaanae unp S amzo; snos azuuzlnsgi allTnal el aaQdnogi uo f ú9 '/ L! S'0 S'O Túg r Iú

S / Z.:

  SZ 'I mnuTmuunleap aze1lns (LsI XalX1) enb3paqzuXs onoqoinoea ap xeaze (O90z auemwX) apTmnq 3p &, l V aeouesTsga el inod euTsa (H lolMal)) 3uepxxue (anxpuoIj) elTz2e (l-D) a3TUO3SelI a: sezeClq (ooea3sem) sae; Tuoa op aeg & Ieuano azeded ap ea3j: anbisolnlleo aga (oz9-a joaq4) 911TaqUj auQIXqpXt loa (lmU Z - O 0 op '0qZ9 SG sel2aqT & 2uTuioD-esuaeo) azaaA ap saaqT * 1 ziznb 1 SNI..NI O1 ç sluesATn: uaTp -p12ul salt 3ue: lodmoo allTne; in a asedg: d uo the II aldmaxaI ap a: Toz: gdo apom el zuemelq.suaes aslpn uo A sidcma i1 Where -mo C90'0 uoTAuua & p xnassTudg on elues -pid tTnb aisrsuoo uo the aZinai al aUTmUeXa o - aldnos zanoueld op zuam - O3aaa. op UUammoo uollSTlzln & aladoadde 'uolzuaAul I amloguoo aZnoqoinouo aaqoueld ap zuama8eaa ap aianae a, p SZ amao; snos azuellnsgi ellTne; and aznoglynol, aletins (L811 xeI41) and onoqoznoeo op xaiel ("O9Z euaumiX) apTmnq lei, where sga el anod auTs (H 10Oa & l) zUepúxo-ltuy (a <tpuoUl) al * aT2 (1-D)) TolsolA: sa2lalD (ooea3se) saqz; Tuoa op agi IUlano [aedud ap aj: enbisolnloo 934 & (OZ9Z oa.q4L) 9TITqiF auQlXxizaloa (mo ZC'o OP 8-0L9 3-G sael2laeqT 2uluioDsuano) azaaA ap saql / xLiJiNYlbz I SINSIGlaafNI LT O ú To, E nal Z SZ'I ap alelsTsUO in nu ng $ l LZ ap T8l lncludes a q uoTsuadsns el anlTp uo 9s3uvAls szuaTppag -u saTl zusesllin ua allinat to aaidd uo 3a II aldmaxaeT Sp aaiozlT9do apom al 3usmalqfsuas as5llln uo IA 2lrIdH úz98stz I S'o oz OZ S ST * IÀ aLO (O uo; aua, p; nosspedp aun aues -pid If, nb aelasuoa uo the a.zna ael aupuexe uo aldnos aeqvueld @p: uamale & a: amoo uolesTll: nl This is the case of the 'uoluauIl V am; oguoa glnoq: tnoeo laqoueld ap: uaema: eaae p azina; unp Z amao; snos a: uellnsi allTnae el aji; dno9.z uo Z'Ic mn1nuTInle, P aelvans 0'! (LII XaI4k) anblipqluús onoqznouD ap xa: el OZ T 'O ("90z auauI) aptmnq zlpl e aoue: sTs: inod auTsgi I (H IOlOaTA) luepXxo-lluv 001 e10o5 Zr ((al & pUODl) alîa; es 9q9 (I (1- :) a: TUO: 8seIToa sagaeto S O (ODWAZOsaM) sOa; TuoO ap a: gi S'l Tseuano. zaTded ap aejU01: e anb $ solnllao? I (or9-3.lzqcl) plI $ T: qTtqlgqiIc I (toU: IOD ap OP-O / L9: a- (1 2 seIaq! & SuTuoZD-suazo) a; aaa, ap saaqTli S * sUsUtS siuaTp -pag2uy sael uelodmoo alllna; aun eaedgad uo the II aldmexa, I ap to * Toierado apom al luaewalqlsues asTlin or IIA: ladmaX ST & IUNvlgb 1 SI2NI IG) IDNI ri MO 66 0'0 uoTnuaOp anessTedg eun alues -pd II, nb e: lvsuoD uo e aO: lni; aI auwmexa u0 aidnos zaloueld ap Oc luamalZAe ammoo UoTeISlTllnt e ag9Tdo: dde 'UOlUeAUl, amizoiuoD g: noqD: nouo aatqoueld ep: uamaleA: a ap allna; unp amio; snos alu: lInsgi ellTnae l azQdnDa, you 8 mnTuTunIv Vp as: l; ns S (úlI xals1) 0I enb: lpqluús onoqoznoeD ap xa: e [tl Qt9or "z euewmZ) appTmq:, from V9e9lsTsp e alnod to Tsgi S <O (H-1O3avli) zuepxo-T: zuy 001 Io 0 ': oZ (III) S5 / (ID) allUO18SiO5 S (OOIA: sa) sa.z; TuoD ap: SI SIseumno aeTded 3p ael: anbwsololio ae: lj 01 (OZs9-lIaq4) pll: ## EQU1 ## where: ## STR1 ## : lssuoo aun V za saz: l If you are not sure about this: qo uoTsuadsns el anlip UO 9 s: uVATns szuaTppaszu sap uevAias as well as an asedid uo the II * ldmexs, 1 ap azal.o: edo apom aI luaemlqtsuas asTlTn uo IIItA illdN3 úz98Sçz

EXAMPLE IX

  This example describes the best way to prepare

  of the rubberized floor covering felt, without

asbestos, in accordance with the invention.

  In a so-called "Hydrapulper" tank containing water, the total amounts of cellulosic paste are added,

  of fibrous polyethylene fibers, fillers and

  oxidant. The content of the device is suspended

  approximately 10 to 15 minutes to ensure

pluck ingredients.

  The slurry is passed sequentially through Jordan refiners, a storage tank and a precipitation tank where dilution is carried out with water to a consistency of 3% and the total amounts of fiber glass, latex synthetic rubber, resin for wet strength, sulfite

QUANTITY INGREDIENTS

  Glass fibers (Owens-Corning Fiberglas DE 670-8 0.32 cm) 2.25 Polyethylene fibrils (Fybrel E-620) 2.75 Cellulosic pulp: Unbleached sulphite pulp 7.75 Coniferous dough (Westvaco) 2 , 25 Charges: Wol lastonite (Pl) 55 Diatomaceous earth 6 Clay suspension (Klondyke KW) 24 Total 100 Antioxidant (Flectol H) 0.8 Resin for wet strength (Kymene 2064) 0, Synthetic Rubber Latex (Dylex 1187) Retention Auxiliary (Hydraid 5501 - Merck & Co) 0.06 Aluminum sulphate 7.65, Al and ammonium hydroxide with stirring for about 3 hours at 5 minutes. The batch weight of 100 parts of fiber and load in the precipitation tank is

of 1132 kg.

  The total amount of the retention aid is added to the preparation composition when it is pumped from the precipitation tank into a Fourdrinier machine.

  where it is transformed into a felt conforming to the

  vention. The wet felt is compressed to remove excess water and is dried on a drum at a temperature

  between about 135 and 149-C.

  The resulting felt is recovered in the form of a

  rubberized floor covering felt according to the invention

  and is used to produce floor coverings.

  dear soft. We examine the felt and we see that it pre-

  has a thickness after calendering of about 0.06 cm.

  Table 1 annexed indicates characteristics

  relating to the physical and chemical properties of the non-asbestos felts of Examples I to IV in comparison with the representative average properties of rubberized felts

  containing asbestos, known technique.

  The above results indicate that the non-asbestos rubberized felts in accordance with the invention exhibit excellent dimensional stability under high humidity conditions while possessing physical properties.

  and chemical acceptable in comparison with rubber felts

  of the known art, containing asbestos.

  Asbestos-free rubberized felt according to the invention can be converted into laminates by means of

  conventional processes by coating them with a decorative surface

  a classic wear pattern such as a vinyl wear layer of

  to prepare floor coverings.

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Claims (9)

  1 - Asbestos-free floor covering felt, characterized in that it comprises in parts by weight   per 100 parts of the total weight of fibers and fillers,   1 to about 10 parts of glass fiber; from about 2 to about 20 parts of cellulosic bitch; from about 1 to   about 20 parts of fibrillated synthetic fibers; of in-   50 to about 96 parts of at least one inorganic   than; and from about 10 to about 40 additional parts of a binder.   2 - felt according to claim 1, characterized in that it comprises in parts by weight per 100 parts of the total weight of fibers and fillers, about 1   about 5 parts of glass fibers; from about 4 to about   15 parts of cellulosic pulp; from about 1 to about 4 parts of fibrillated synthetic fibers; from about to about 90 parts of at least one inorganic filler;   and from about 10 to about 25 additional parts of binder.   3 - Felt according to one of claims 1 or 2,   characterized in that the fibrillated fibers are   fibrillated polyolefin fibers. -   4 - felt according to one of claims 1 or 2,   characterized in that the binder is a synthetic rubber.   5 - felt according to one of claims 1 or 2,   characterized in that the inorganic filler is selected from the group consisting of paper clay filler, wollastonite, talc, calcium carbonate, mica,   pyrophyllite and infusoria lands.   6 - felt according to one of claims 1 to 5,   characterized in that it contains a resin used   to improve the wet strength of papers.   7 - felt according to claim 6, characterized in that it comprises from about 0.02 to about 2 parts   additional resin used to improve the resistance   wet state of papers.   8 - felt according to one of claims 1 to 7,   characterized in that it comprises an anti-oxidant for latex. 9 felt according to claim 8, characterized in that it comprises from about 0.2 to about 1.6 parts anti-oxidant for latex.   Felt according to one of claims 1 to 9,   characterized by the fact that it has a dimensional stability   of + 0.30% or less, when subjected to the conditions of the high humidity dimensional stability test. 11 - felt according to claim 10, characterized in that it has a dimensional stability of   + 0.20 or less, when subjected to the conditions of the   dimensional stability with high humidity.   Felt according to one of claims 1 to 11,   characterized by having a decorative wear surface assembled to the floor covering felt for   to form a surface coating.