Energy savings plus mechanical reinforcement and rheology control

SEBS / Crosslinked Butyl Rubber Hot Melt Sealant (B)

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Styrene Ethylene Butadiene Styrene Rubbers (SEBS)

Applicable Industrial Sectors

Automotive , Buildings & constructions

Applicable Base Polymer Properties

Styrene block copolymers (SBCs) offer cohesion, strength, and heat resistance for both pressure sensitive adhesives (PSAs) and non-pressure sensitive adhesives. The styrene phase forms a physically crosslinked network in the adhesive at room temperature. Of the SBCs, styrene ethylene butadiene styrene (SEBS) has the high shear strength and excellent weathering resistance. SEBS hot melt sealants are achieving success in the automobile assembly and mobile home manufacturing industries.

Only SBC polymers that are fully saturated can offer excellent resistance to degradation by air, ozone, or UV light. SEBS copolymers have saturated rubber midblocks and when formulated with saturated resins, plasticizers, and stabilizers can obtain a balance of adhesive properties as well as resistance to degradation by oxidation or UV light.

Typical Formulation Ingredients

Ingredient

Parts by weight

SEBS Elastomer (Kraton G-1652, Kraton)

Crosslinked butyl (Kalar 5214, Hardman, Inc.)

Tackifier (Eastotac H-130E resin, Eastman)

Polybutene (Indopol H-300, Amoco Chemical)

Calcium carbonate

xxxx

Titanium dioxide

Zinc oxide

Antioxidant (Irganox, 1010, Ciba-Geigy)

xxx

Amorphous polyolefin (Eastoflex P1023 APP, Eastman)

(Source: Eastman Chemical Company)

Typical Properties

Properties

Penetration hardness, ASTM D1321, dmm

Peel adhesion, ASTM C794 modified, pli

Canvas-to-cold rolled steel failure

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Processing

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Resulting Properties

SEBS thermoplastic elastomers are best known for their high heat resistance, high tear strength, and good tensile strength and elongation. Sealants have good adhesion to glass and aluminum along with excellent mechanical properties. It also has a low moisture vapor transmission rate along with excellent UV and thermal stability.

In some applications, however, stress is carried by the sealants, such that the material is in essence considered to be an adhesive-sealant. SBC copolymers can be formulated to meet the requirements of either kind of sealant. Because of their lower cost, SBS block copolymers are usually chosen for this type of application, but in roofing and paving applications, the SEBS block copolymers are also used because of better long-term aging resistance. The table above shows a starting formulation for a low viscosity SEBS hot melt sealant.