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AssigneeEnichem Elastomeri S.r.l.
InventorsGian Tommaso Viola, Bruno Pedemonte, Carla Parodi, Antonio Gurnari
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Adhesive compositions containing a hydroxy-functionalized radial, three-arm copolymer the arms of which contain styrene-isoprene blocks, in which the average molecular weight of the polystyrene blocks is lower than 30,000 and is generally comprised within the range of from 7,000 to 30,000, and the average total molecular weight of said block polymers is comprised within the range of from 120,000 to 250,000. Such a functionalized radial copolymer makes it possible, according to the monomeric composition adopted and by suitably blending with tackifier resins and plasticizer oils, adhesive compositions to be obtained which can be of "hot melt" type or of solvent borne type, displaying good adhesive and cohesive properties and such as to secure an optimal balance between these properties and their processing ability.
An adhesive composition based on functionalized radial styrene-isoprene block copolymers, containing by weight of the total composition:
The adhesive composition according to any of the preceding claims, in which the tackifier resin which is used in order to promote and improve the adhesive properties of the composition, has a softening point generally lower than 140.degree. C.
The adhesive composition according to any of the preceding claims, in which the tackifier resin is constituted by at least one from the following components:
The adhesive composition according to any of the preceding claims, in which the plasticizer oil is a naphthenic oil or a butene telomer.
The adhesive composition according to any of the preceding claims, additionally containing at least one compound having antioxidant activity.
A functionalized radial styrene-isoprene block copolymer having the general formula (I):
The process according to any of claims from 14 to 16, in which the coupling step (2) is carried out at temperatures comprised within the range of from 80.degree. to 120.degree. C.
Dependencies are inferred from the claim text.