Styrene Butadiene Copolymer Resins
Adhesives and sealants based on styrene butadiene copolymers
(SBCs) are both useful and unusual. They have the solubility and thermoplastic nature of polystyrene. At ambient temperature, they have the toughness and resilience of an elastomer.
This characteristic provides styrene butadiene copolymers adhesives with versatile properties in both adhesive and sealant formulations. Because of their thermoplastic nature, SBC can be easily formulated into either hot melt adhesives or solvent solutions. They can even be chemically crosslinked via radiation or the use of reactive end groups.
Styrene butadiene copolymers resins represent a versatile family of resins for adhesive and sealant development. They bond well to many substrates, and their formulation can be easily adjusted to achieve widely varying properties.
This modification usually takes the form of:
- Selection of the appropriate SBC resin of which many are available
- Addition of tackifiers primarily to modify the rheological properties
- Addition of plasticizers, waxes, or oils primarily to modify the application properties
- Addition of other additives such as antioxidants, UV inhibitors, fillers, etc. to provide sufficient stability for the application process and service conditions.
As a result formulations prepared with styrene butadiene copolymer resin as base polymer offer a unique combination of properties and have found wide applications in diverse markets such as automotive, building and construction, shoemaking, textiles, packaging, bookbinding, graphic arts, and tapes and labels.
This guide will endeavor to direct the formulator through the process of selecting an appropriate styrene butadiene copolymer resin for a specific adhesive or sealant formulation and end-use requirement. However, styrene butadiene copolymers resins represent only one major ingredient in the formulation as noted above. They gain their ultimate performance characteristics when formulated with additives or modifiers. The selection of various additives and modifiers are addressed in other SpecialChem selection guides.