US Patent 5866041a.docx

US Patent 5866041a.docx

《US Patent 5866041a.docx》由会员分享，可在线阅读，更多相关《US Patent 5866041a.docx（21页珍藏版）》请在冰豆网上搜索。

USPatent5866041a

USPatent5866041-Fattyaciddefoamerswithimprovedshelflife

USPatentIssuedonFebruary2,1999

EstimatedPatentExpirationDate:

 June26,2017EstimatedExpirationDateiscalculatedbasedonsimpleUSPTOtermprovisions.Itdoesnotaccountforterminaldisclaimers,termadjustments,failuretopaymaintenancefees,orotherfactorswhichmightaffectthetermofapatent.

Abstract Claims Description FullText

ViewPatentImages（PDF）

（Registeredusersonly）

Abstract

Thepresentinventionprovidesanantifoamemulsionwithimprovedshelf-lifeandamethodformakingsame.Theimprovedshelf-liferesultsfromdispersingafattyalcoholdispersioninanemulsionofanotherliquid.Tothisend,theantifoamemulsionofthepresentinventionincludesaninternalphaseofafattyalcoholdispersion,anemulsifier,andanexternalphaseincludingawaterinsolubleorpartiallymiscibleliquid.

Claims

Weclaim:

1.Anantifoammixedemulsioncomprising:

aninternaloil-in-waterphaseincludingafattyalcohol,afirstemulsifier,andwater;

asecondemulsifier;and

anexternaloilphaseincludingacarrierliquid;

whereinsaidfirstemulsifierdispersessaidfattyalcoholintheinternaloil-in-waterphaseandsaidsecondemulsifierdispersessaidinternaloil-in-waterphaseinsaidexternaloilphase.

2.Theantifoamemulsionofclaim1whereinthefattyalcoholisafattyalcoholobtainedfromaZieglerprocess.

3.Theantifoamemulsionofclaim1whereinthefattyalcoholisafattyalcoholobtainedfromanoxosynthesis.

4.Theantifoamemulsionofclaim1whereinthesecondemulsifierisselectedfromthegroupconsistingof:

alkylphenolethoxylate;alcoholethyoxylate;polyether-polysiloxane;sorbitanfattyacidester;poly-12-hydroxystearicacidpolyethyleneglycolesters;polyglycerolfattyacidestersandpoly-12-hydroxystearicacidsorbitolesters.

5.Theantifoamemulsionofclaim1whereinthecarrierliquidisselectedfromthegroupconsistingof:

guerbetbranchedalcohol;octanol;decanol;oleylalcohol;mineraloil;lightpetroleumdistillates;polybutenes;siliconeoil;polypropyleneglycol;andmixturesthereof.

6.Theantifoamemulsionofclaim5whereintheguerbetbranchedalcoholisselectedfromthegroupconsistingof:

2-hexyl-decanol;2-octyl-dodecanol;2-butyl-octanol;2-decyl-tetradecanolandmixturesthereof.

7.Theantifoamemulsionofclaim1whereintheexternaloilphasefurtherincludeshydrophobicparticles.

8.Theantifoamemulsionofclaim7whereinthehydrophobicparticlesarepresentinarangeofapproximately0.1%to10%byweightoftheantifoamcomposition.

9.Theantifoamemulsionofclaim1whereinthecarrierliquidisawaterinsolubleliquidandispresentinarangeofapproximately20%to80%byweightoftheantifoamcomposition.

10.Theantifoamemulsionofclaim1whereinthesecondemulsifierispresentinarangeofapproximately0.10%to10%byweightoftheantifoamcomposition.

11.Theantifoamemulsionofclaim1whereintheinternaloil-in-waterphaseispresentinarangeofapproximately10%to70%byweightoftheantifoamcomposition.

12.Amethodforimprovingtheshelf-lifeofafattyalcoholdefoamercomprisingthestepsof:

providingafattyalcoholdispersioncomprising:

afattyalcohol;afirstemulsifier;andwater;and

dissolvingasecondemulsifierinawaterinsolubleliquidtoformamixture;and

mixingthefattyalcoholdispersionwiththemixturetherebyformingamixedemulsionofthefattyalcoholdispersionwithawaterinsolubleliquid,whereinthefattyalcoholdispersionisadispersedphaseinsidethemixedemulsionandthewaterinsolubleliquidisanexternaloilphaseofthemixedemulsion;

whereinsaidfirstemulsifierdispersessaidfattyalcoholinsaidfattyalcoholdispersionandsaidsecondemulsifierdispersessaidfattyalcoholdispersioninsaidexternaloilphase.

13.Themethodofclaim12whereinthestepofprovidingthefattyalcoholdispersionisfurtherdefinedbyprovidingapproximately10%to70%byweightofthefattyalcoholdispersionbasedonthemixedemulsion.

14.Themethodofclaim12furthercomprisingthestepofaddinghydrophobicparticlestotheexternaloilphaseoftheemulsion.

15.Themethodofclaim13whereinthehydrophobicparticlesarehydrophobicsilica.

16.Themethodofclaim12whereinthewaterinsolubleliquidispresentinarangeofapproximately20%to80%byweightoftheantifoamcomposition.

17.Themethodofclaim12furthercomprisingthestepofhomogenizingthemixedemulsionwithahigh-sheardevice.

18.Themethodofclaim12whereinthesecondemulsifierisamixtureoftwoormoreemulsifiers.

Description

BACKGROUNDOFTHEINVENTION

Thepresentinventiongenerallyrelatestoantifoamsforuseinthepaperindustry.Morespecifically,thepresentinventionrelatestofattyalcoholantifoamswithimprovedshelflife.

Foamisamaterialmadeupofgasbubblesseparatedfromoneanotherbyfilmsofliquid.Althoughfoamsofexceptionalstabilityaredesiredinsomecommercialapplications,foamisanuisanceinmanysituations.Forinstance,intheglueandpaperindustries,foamscauseundesirablecomplications.Acommonrecourseistheadditionofchemicalantifoams,whicharesometimesinsolubleliquidsofverylowsurfacetension.Whenadropletofsuchaliquidissprayedontothefoamoriscarriedintoitbymechanicalagitation,itspreadsspontaneouslyandrapidlyatthesurfaceofthefilm,virtuallysweepingthefoamawayasitdoesso.Liquidsfrequentlyusedforthispurposeareoctylalcohol,tributylphosphate,siliconeandmanypatentedpreparations.

Antifoams,suchasfattyalcoholdefoamers,thusserveacriticalfunctioninavarietyofindustries,suchasthepaperindustry.However,adisadvantageofcommercialantifoamformulationsistheirlimitedshelf-life.Knownantifoamsoftencreamduringstorageandinsomecasesthickentosuchanextentthattheycannolongerbepumped.Thisthickeningorgelationrenderstheapplicationofthefattyalcoholactiveingredienttoafoamingsystemdifficultatbest,limitingthesaleofproductscontainingsubstantiallythefattyalcoholactiveingredient.

Moreover,anotherdisadvantageofknownantifoamsisthattheyareineffectiveatelevatedtemperatures.Antifoamemulsions,whichareconventionallyusedinpapermaking,areknowntobecomelesseffectiveifthetemperatureoftheaqueoussystemtobedefoamedincreasesabove50°C.Attemperaturesabove60°C.,anevenmorerapiddecreaseintheeffectivenessoftheantifoamoccurswhenknownoil-in-wateremulsionsareused.Sinceanincreasingtendencyforwatercirculationsinthepapermillsistobeclosedones,theresultisthatthetemperatureofthewaterconveyedinthecirculationincreasesduringpapermaking,sothattheeffectivenessoftheantifoamsusedtodatedecreasessubstantially.

Therefore,aneedexistsforafattyalcoholantifoamformulationwithimprovedshelflifeandimprovedelevatedtemperatureperformance.

SUMMARYOFTHEINVENTION

Thepresentinventionprovidesafattyalcoholdefoamerwithincreasedshelf-lifeaswellasimprovedperformanceunderelevatedtemperatureconditions.Theimprovedshelf-lifeofthepresentinventionresultsfromprovidingtheactiveingredientofanantifoamformulation,namelyawater-baseddispersionofthesubstantiallyfattyalcoholingredient,inaformthatisinsensitivetoincreasesinviscosityorage.Inthisregard,thepresentinventionprovidesformingamixedemulsionwhereinthefattyalcoholwater-baseddispersioniscontainedastheinternalordispersedphaseofanotherfluid.Whereas,theimprovedelevatedtemperatureperformanceresultsfromtheadditionofhydrophobicparticlestotheexternalorcontinuousphaseoftheemulsion.

Thepresentinventionprovidesanantifoamemulsionthatexhibitsincreasedstabilityoveralongerstorageperiodandunderavarietyofconditions.Theantifoamemulsionincludesaninternalphaseconsistingofafattyalcoholdispersion.Theemulsionalsoincludesanemulsifierandanexternalphaseincludingawaterinsolubleorpartiallymiscibleliquid.

Conventionalfattyalcoholdispersionscanbeusedfortheinternalphaseofthepresentinvention.Forexample,fattyalcoholsobtainedfromtheZeiglerprocessortheoxoprocessaresuitable.Additionally,naturallyoccurringmaterialsarealsoacceptable.

Suitablecarrierliquidsfortheexternalphaseagainareanywaterinsolubleorpartiallymiscibleliquid.Examplesofthecarrierliquidinclude:

Guerbetbranchedalcohols;octanol;decanol;oleylalcohol;mineraloil;lightpetroleumdistillates;polybutenes;siliconeoilandmixturesthereof.

Topromotetheformationandstabilizationofthemixedemulsion,anemulsifierisused.Simplemonomericemulsifiersaswellaspolymericemulsifierscanbeusedinthepresentinvention.Examplesofsuitableemulsifiersthatcanbeusedtoformtheantifoamemulsionarealkylphenolethoxylates,alcoholethoxylates,polyether-polysiloxanes,andsorbitanfattyacidesters.

Inapreferredembodiment,themixedemulsionalsoincludeshydrophobicparticles.Useofhydrophobicparticles,suchashydrophobicsilica,intheexternalphasenotonlyimpartsadegreeofmechanicalstabilitytotheemulsion,butalsoimprovestheelevatedtemperaturedefoamingperformanceoftheemulsion.

Thepresentinventionalsoprovidesamethodforimprovingtheshelf-lifeofafattyalcoholdefoamer.Thismethodincludesaninitialstepofprovidingafattyalcoholdispersion.Then,thefattyalcoholdispersionisformedintoamixedemulsionwithinacarrierliquid.Insuchemulsion,thefatty