Uv-curable block copolymer composition

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 53/02 (2006.01) C08K 5/04 (2006.01) C08K 5/07 (2006.01) C08K 5/17 (2006.01) C08K 5/37 (2006.01) C08K 5/378 (2006.01) C09D 5/32 (2006.01) C09D 153/02 (2006.01) C09J 153/02 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2167185

UV-curable block copolymer composition comprising: (a) 100 parts by weight of a block copolymer comprising at least one polymer block A derived from monovinyl aromatic compound and at least one polymer block B derived from a conjugated diene, wherein: the content of monovinyl aromatic compound is in the range of from 5 to 50 % by weight based on the total weight of block copolymer; each block A has an apparent molecular weight in the range of from 1,000 to 50,000; and each block B has an apparent molecular weight in the range of from 10,000 to 250,000; and (b) 0.5-30 parts by weight of at least one photoinitiator, characterized in that the block copolymer is a multi-armed block copolymer and at least one photoinitiator is used containing a carbonyl group which is directly bonded to at least one aromatic ring structure.

Cette composition de copolymère en bloc durcissable aux ultraviolets est constituée (a) de 100 parties en poids d'un copolymère en bloc comportant au moins un bloc A de polymère dérivé d'un composé aromatique du monovinyle et d'au moins un bloc B de polymère dérivé d'un diène conjugué, et se caractérise en ce que: le contenu du composé aromatique de monovinyle se situe dans une fourchette comprise entre 5 % et 50 % du poids total du copolymère en bloc, le poids moléculaire apparent de chaque bloc A se situe dans une fourchette comprise entre 1.000 et 50.000, et le poids moléculaire apparent de chaque bloc B se situe dans une fourchette comprise entre 10.000 et 250.000, et (b) de 0,5 à 30 parties en poids d'au moins un photoinitiateur. Ce copolymère a pour caractéristique de comporter plusieurs bras. Le photoinitiateur utilisé contient un groupe carbonyle directement lié à une structure de cycle aromatique.

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