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Example: Baypren adhesive with optimum cost-to-benefit ratio

Fig. 8: Baypren formulation (test formulation 7007)

Optimization of the cost-to-benefit ratio

Ingredient Baypren 320 Baypren 330 Baypren 350 Pergut S 40 Bayoxide aktiv Rhenofit D/A Vulkanox BKF Ethyl acetate White spirit 65/95 °C Cyclohexane Methyl ethyl ketone

1 100

2

3 (pbw)

100

100 variable (0/5/10) 4 4 2 35

70

140

105

12

Ever increasing ecological and economic constraints are forcing the adhesives-pro- cessing industry to search constantly for ways of finding the ideal compromise be- tween product quality and acceptable eco- nomics. As far as Baypren is concerned, we see various possibilities – even in toluene- free formulations – to obtain acceptable properties at lower cost. The Baypren grades shown in the table on the left (Fig. 8) are all fast-crystallizing types and differ in their polymer viscosity, which rises in the sequence 320, 330, 350. As is to be expected, the same final viscosity of the adhesive can be achieved through lower polymer contents in the same sequence – evident from the lower solids content. This advantage is, however, gained at the cost of a lower overall strength of the bond. This is where the addition of Pergut opens up the possibility of achieving an acceptable level of strength in the bond at a lower price and despite the lower solids content. As shown in Figs. 8 and 9, the combination of high- viscosity Baypren and Pergut (formulation 3c) produces the same initial strength as the standard formulation based on Baypren 320 (formulation 1a).

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