Foam stabilizer oil

Claim 1

A FOAM STABILIZER OIL PREPARED BY THE EXHAUSTIVE CATALYTIC CO-POLYMERIZATION OF A PRECURSOR COMPOSITION CONSISTING ESSENTIALLY OF FROM 65 TO 99 MOL PERCENT OF A MONOMERIC MIXTURE CONSISTING OF A PLURALITY OF MONOMERS, FROM 17 MOL PERCENT TO 67 MOL PERCENT OF THE MONOMERS BEING COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF VINYL PYRROLIDONE, METHYL ALLYL URETHANE, AND 3 SULFOLENE, FROM 17 MOL PERCENT TO 67 MOL PERCENT OF THE MONOMERS BEING PLASTICIZING COMPOUNDS HAVING GROUPS OF AT LEAST 4 CARBON ATOMS EXTENDING FROM POLYMERIZABLE ETHYLENIC GROUPS, SAID PLASTICIZING COMPOUNDS BEING SELECTED FROM THE GROUP CONSISTING OF DIBUTYL MALEATE, VINLY BUTYL ETHER, VINYL ISOOCTYLETHER, AND BUTYL ACRYLATE, AND FROM 17 MOL PERCENT TO 67 MOL PERCENT OF THE MONOMERS BEING VINYL ACETATE, SAID PRECURSOR COMPOSITION CONTAINING FROM 1 TO 35 MOL PERCENT OF CHAIN TRANSFER COMPONENT SELECTED FROM THE GROUP CONSISTING OF NONYLPHENYLPOLYLOXYETHYLENEETHANOL AND DODECUL MERCAPTAN, SAID CHAIN TRANSFER COMPONENT BEING ADAPED TO MODIFY THE COPOLYMERIZATION REACTION SUFFICIENTLY THAT THE FOAM STABILIZER HAS A VISCOSITY GREATER THAN 2000 CENTIPOISES BUT TO PREVENT DEVELOPMENT OF A VISCOSITY GREATER THAN 20,000 CENTIPOISES.