POLYMER-SURFACTANT INTERACTION 465 LOG POLYMER CONCENTRATION (wt.%) -2 -1 0 O I I I I POLYMER ALONE •m o 6O TOL 15-S-9 ALONE • 5o P" TERGITOL 15-S- 40 - + 0.1% POLYMER 30 t -6 -5 -4 -3 LOG SURFACTANT CONCENTRATION (m/I) Figure I. Surface tension concentration curves of Tergito] 15-S-9 in water at 25øC, with and without 0.1% Polymer JR 70 •k,+-C'14 BETAINE ALONE o 60 "' 50 •. C,14 40 -- 0.1% JR-400 -• 30-- I I I I -5 -4 -3 -2 LOG SURFACTANT CONCENTRATION (m/I) Figure 2. Surface tension, concentration curves o[ tetraclecyl betainc in water at 25øC, with and without 0.1% Polymer JR Natural pH (,•7)

466 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 7o o ALONE LAS + 40 -- POLYMER 30 .SURFACTANT / POLYMER Wt RATIO 1:8 1:4 1 2 1:1 I I C t i p C APPEARANCE -5 -4 -3 -2 LOG SURFACTANT CONCENTRATION (m/I) Figure 3. Surface tension, concentration curves of Na tridecylbenzene st•lfonate in water at 25øC, with and without 0.1% Polymer J•R (For "appearance" code see Figs. 7-9.) 70- 60 - LONE E :" 50- -_• 0.1% POLYMER 40- SORFACTANT/POLYMER Wt. RATIO I I III l 1 81:4 1:21:1 2:1 30- APPEARANCE c t pp•p c I I I I -4 -3 -2 -1 LOG SURFACI'ANT CONCENTRATION (m/I) Figure 4. Surface tension, concentration curves of Na Lauryl su]fate in water at 25øC, with and without 0.1% Polymer JR