Ultra fine calcium carbonate Omyabond 120

Solvent Borne SEBS / Polybutene Sealant

Adhesives Formulation

Applicable Type

Solvent borne Adhesives , Sealants

Applicable Base Polymer

Styrene Ethylene Butadiene Styrene Rubbers (SEBS)

Applicable Industrial Sectors

Buildings & constructions , Electrical & Electronic Bonding , Assembly , Household appliance assembly

Applicable Base Polymer Properties

Isobutene rubber is an elastomeric polymer that is used in a wide variety of construction sealants. Because of its unique properties, it also is used in the automotive, electrical/electronic, and food processing industries among others.

Polyisobutylene as a homopolymer is permanently tacky, and it has the characteristic of being self-healing. Polyisobutylene is a glass-clear polymer with elastomeric properties although showing much greater cold flow than most unvulcanized rubbers. In this formulation, the SEBS is added to provide better strength characteristics.

Sealants can be applied in a number of different forms. It is used widely as a hot melt, solvent solution, preformed tape or gasket, and as a gun-dispensable sealant (this formulation).

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

SEBS polymer (Kraton G-1652, Kraton)

xxx

Tackifier (Pexalyn A-960, Hercules)

xxx

Isobutene polymer (Indopol H-300, Ineos Oligomers)

xxx

Filler

xxx

Antioxidant (Irganox 1010, BASF)

xxx

Methyl ethyl ketone

xxx

Typical Properties

Properties

Hardness, Shore A

Tensile strength, psi

xxx

Elongation, %

xxx

100% Modulus, psi

xxx

Specific gravity

xxxx

180° Peel strength, pli, canvas to Anodized aluminum (unprimed)

180° Peel strength, pli, canvas to Glass (unprimed)

Processing

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Resulting Properties

It is a typical solvent borne isobutene sealing compound which offers excellent adhesion to most of the substrates and good water resistance. However, it can stain adjacent surfaces and has relatively poor recovery from extension.

The polymeric compositions along with the other additives will affect both the application and the ultimate performance properties of the joint.

This formulation has the following characteristics:

Can be extruded readily from a manual applicator
Lower cost
Low-temperature flexibility
Excellent durability and water resistance
Good package stability and adhesion
Will withstand cyclic joint movement

(Source: Flick, E.W., Adhesive and Sealant Compound Formulations, Noyes Publications, 1984, p. 329)