Shell Oil Comapny

Noel Raymond De Keyzer

Eric-Jack Gerard

Jeroen Van Westrenen

Birgitte Maria Van De Vliet

Luc Ives De Craene

Karin Marie-Louise Morren

Martine Jeanne Dupont

Martine Jeanne DuPont

Hot melt adhesive compositions, comprising

Adhesive compositions comprising block copolymers of a monovinylaromatic

Radiation sensitive block copolymers to be used in hot melt adhesive composition characterized in that they have the general formula (AB).sub.p (B.sup.1).sub.q X, wherein A is poly(vinylaromatic) block and B and B.sup.1 are poly(butadiene) blocks, wherein X is the residue of a hexavalent coupling agent, wherein p and q both have a number average value in the range from 1.5 to 4.5, whereas the sum of p and q values being 6, wherein the block copolymers have an average bound vinyl aromatic content in the range of from 10 to 50 wt %, preferably in the range of from 10 to 30 wt %, a total apparent molecular weight in the range of from 100,000 to 500,000, and a vinyl content in the poly(butadiene) blocks in the range of from 35 to 70 wt %.

Radiation sensitive vinyl aromatic block copolymers and compositions

Block copolymers suitable for hot melt adhesive composition characterized in that they have the general formula (AB).sub.p (B.sup.1).sub.q X, wherein A is poly(vinylaromatic) block and B and B.sup.1 are the same or different poly(butadiene) blocks, wherein the 1,2 addition (vinyl) content is in the range of from 25 to 70% by weight, wherein X is the residue of a multivalent coupling agent having a maximum of active sites (m) in the range of from 3 to 6, wherein p and q both are integers of from 0 to m, provided that the sum of p and q values is less than m and the coupling efficiency is less than 90%, said block copolymer having an average total vinyl aromatic content in the range of from 10 to 50 wt % and preferably in the range of from 10 to 30 wt %, and having a total apparent molecular weight in the range of from 100,000 to 500,000. Adhesive, sealant, or coating compositions comprising said block copolymers and in particular radiation curable compositions, the use of said compositions, and processes for the preparation of said block copolymers are also included herein.

Vinyl aromatic block copolymers and compositions containing them

A process for marking a pavement comprising melting a dry blended thermoplastic pavement marking composition which contains an elastomer and a substantially non-aromatic hydrocarbon resin and applying the molten composition thus obtained to the pavement, wherein the elastomer is a block copolymer containing at least one poly(conjugated diene) block which may or may not have been hydrogenated and at least two poly(vinylaromatic) blocks, which block copolymer is present in the dry-blended composition in the form of a powder.

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Louvain-La-Neuve, Belgium

Noel Raymond De Keyzer