Sealants and putties

Indopol polybutenes plasticize and add tack to elastomer-based sealants. Incorporation of polybutene results in a softer, more easily extruded sealant. Such sealants can be applied from an application gun without using large proportions of solvents, or extruded into tape form supported on removable backing paper. The reduction in solvent content of the sealants minimizes the shrinkage of the product after application, as well as being environmentally beneficial.

Indopol polybutenes are widely used as partial replacements for drying oils in sealant and putty formulations. Their incorporation gives permanence, improved adhesion and cohesion and ageing, less shrinkage and lower oil-to-filler ratios.

Combinations of butyl rubber and Indopol H-6000/H-18000 are used in sealants for double glazed window systems, and other applications where low moisture vapor transmission is important. They can be suitable for use as both primary and secondary sealants in the window-glazing unit. Sealants based on thermoplastic elastomers are another area where Indopol polybutene can offer advantages. For instance butadiene-ethylene-styrene triblock copolymers or ethylene-propylene terpolymers can be plasticized with polybutene.

In high performance silicone sealants low molecular weight polybutenes such as Indopol L-6 can be employed as a partial replacement/extender for silicone oil, which can result in cost savings without detracting from the properties of the sealant. Clear sealants based on polybutene have outstanding peel adhesion and good ageing characteristics, and are also more translucent than commercial silicone, acrylic or thermoplastic elastomer sealants.

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