Sulfones, polybutene

Although these polymers have iaadequate stabiUty and processibiUty for most plastics appHcations, the abiUty to undergo scission back to the gaseous monomers has afforded some utility ia fabrication of electron-beam resists for photoUthography. Polybutene sulfone (251) and polyhexene sulfone (252) have been developed for this small-volume but high value appHcation. 

Fig-1. Rate of formation of polybutene sulfone from monomer mixtures containing 9,1 mole-% 1-butene. (A) and (B) photochemical initiation at two different intensities (G) and (H) initiation by silver nitrate at two different concentrations (/) initiation by benzoyl peroxide. Reproduced, with permission, from Dainton and Ivin Disc. Faraday Soc. 14, 199 (1953). 

A suspension polymerization process can be used to manufacture beads in polybutene-sulfone for use in the production of expanded cellular material. The solvent power of the reaction medium is important with respect to the homogeneity of the beads and to the diffusion of the blowing agent. Processing and properties of this new cellular material are examined briefly. 

Butene—Sulfur Dioxide Copolymerization. Polybutene sulfones are well known. Copolymerization of 1-butene with sulfur dioxide is characterized by certain features ... 

Expandability. Polybutene sulfone is insoluble in 1-butene but is soluble in sulfur dioxide. The higher the concentration of 1-butene in 1-butene-sulfur dioxide mixture, the lower is the solubility of the copolymer in this mixture. Even when copolymerization takes place with an excess of sulfur dioxide, the two monomers react in equimolecular... 

At the end of copolymerization C-4 hydrocarbons are added before removal of the unreacted sulfur dioxide. Sulfur dioxide favors the diffusion of C-4 hydrocarbons into the beads and allows a good and homogeneous distribution. Finally, the unreacted sulfur dioxide is removed. Since sulfur dioxide dissolves polybutene sulfone, its diffusion rate is very high in contrast with the hydrocarbons which diffuse slowly and remain occluded in the beads. 

Manufacture and "Properties of Cellular Materials from Polybutene Sulfone... 

Properties of Poly butene Sulfone Foam. Many properties of polybutene sulfone foam are similar to those of polystyrene foam. Mechanical properties are a little lower for the same foam density, but the bulk density of polybutene sulfone is 1.37 compared with 1.05 for polystyrene. Figure 6 shows that mechanical properties vary in the same ratio as density The insulating properties of polybutene sulfone foam are very good, somewhat better than polystyrene foam (Figure 7). Polybutene sulfone has a good solvent resistance as shown in Table I. In particular, styrene, benzene, and toluene do not attack polybutene sulfone but attack polystyrene. 

Polybutene sulfone foam is also different from polystyrene foam in its combustion behavior, which is important for various applications. This foam burns without smoke production unlike polystyrene which burns with an abundant black smoke. 

Applications. Polybutene sulfone foam can be used in all usual applications of rigid foams, in particular with the following obvious advantages over expanded polystyrene ... 

Sandwich panels polyesters can be coated directly on polybutene sulfone foam (styrene does not dissolve the foam). 

G good, B bad, EPBS expanded polybutene sulfone, EPS expanded polystyrene. 

Witco s petroleum sulfonate, Petronate TRS 12B, is similar to Petrostep 465, and Witco s Petronate TRS lOB falls between Petro-step 465 and Petrostep 450. The Salinity Requirement Diagram of Amoco s (polybutene) Sulfonate 151 lies even lower than the diagrams for Petrostep 465 and Petronate TRS 12B. Midpoint salinity for that sulfonate at 5.0 percent surfactant in the system is about five percent SDSW. 

RegtMory SARA Title III nonhazardous Ammonium polybutene sulfonate... 

Trade Names Baypure DS-100/40% Baypure DS-100 Solid DonlarA-2C Donlar A-3C Donlar A-5D DonlarALC-70 DonlarALC-130 DonlarB-3D Donlar C-10D Donlar C-20C Donlar C-30D Donlar C-50D See also Polyaspartic acid homopolymer, sodium salt Sodium polybutene sulfonate Ionic Nature Anionic... 

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