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公开(公告)号：US3779974A
公开(公告)日：1973-12-18
申请号：US3779974D
申请日：1972-09-26
CPC分类号： C08J3/07 , C08J2323/32
摘要： A RUBBER LATEX OF SULFONATED BUTYL RUBBER CONTAINING >0.5 MOLE PERCENT SO3H IS PREPARED BY FORMING AN EMULSION OF A SOLUTION OF SULFONATED BUTYL RUBBER IN A SUITABLE SOLVENT USING NON-IONIC EMULSIFIERS AND THEREAFTER STRIPPING OFF THE SOLVENT TO LEAVE A LATEX OF SULFONATED BUTYL RUBBER DISPERSED IN WATER. PRIOR TO STRIPPING THE SOLVENT, THE EMULSIFIERS ARE REMOVED FROM THE SYSTEM BY CENTRIFUGATION, THE SULFONATED BUTYL RUBBER BEING SELF-EMULSIFIABLE, ONCE IT HAS BEEN DISPERSED. PLASTICIZERS ARE ADDED TO THE LATEX TO PREVENT CRACKING OF FILMS PREPARED THEREFROM.
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公开(公告)号：US3770682A
公开(公告)日：1973-11-06
申请号：US3770682D
申请日：1972-01-20
发明人： O FARRELL C , HUBBARD A , POWERS K
CPC分类号： C08J3/07 , C08J2323/32
摘要： SULFONATED BUTYL RUBBER CONTAINING GREATER THAN 0.5 MOLE PERCENT SO3H IS EMULSIFIED BY DISSOLVING THE ACID FORM OF THE POLYMER IN A SUITABLE SOLVENT INCORPORATING INTO THE SOLVENT RUBBER CEMENT ABOUT 5 TO 30 WT. PERCENT OF A POLAR COSOLVENT AND USING AS EMULSIFIERS NONIONIC EMULSIFIERS AT LEAST ONE OF WHICH IS AN ETHOXYLATED C8-C12 ALKYL PHENOL. IN A PREFERRED EMBODIMENT, AT LEAST ONE EMULSIFIER IS A WATER DISPERSIBLE OR WATER SOLUBLE EMULSIFIER AND IS DISPERSED IN THE WATER INTO WHICH THE CEMENT IS TO BE DISPERSED. THE ORGANIC AND POLAR SOLVENTS MAY BE STRIPPED FROM THE EMULSION ALONG WITH EXCESS WATER TO FORM LATICES SUITABLE FOR USE AS COATINGS AND FILM FORMERS.
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