Hydrogenated block copolymers, compositions, and Optical Disk media including DVD discs can be recorded or recorded, including cdcapaces being rewritten.With the capacity to be deleted and digital business card and Smart Card comprising Said composition

摘要

Described are compositions and Hydrogenated block copolymers of butadiene and Vinyl Aromatic monomers.Useful in preparing dediscos Optical Media with very low birefringence.Specifically, it is omposiciones Dec Hydrogenated block copolymers.Wherein Said block copolymer comprises at least two different blocks Hydrogenated Vinyl Aromatic monomers polimerizadohidrogenado,Referred to in this comobloque Hydrogenated Vinyl Aromatic Polymer and at least one block butadiene monomer polimerizadohidrogenado,As mentioned in the present Block butadiene Polymer HydrogenatedWhere the other Hydrogenated block copolymer is characterized by: (a) a Weight ratio of block to block butadiene Polymer Hydrogenated Vinyl Aromatic Polymer Hydrogenated 40: 60 or less; (b) a numerical Weight molecularpromedio total (MNT) from 30000 TO 80000, where each block of Hydrogenated Vinyl Aromatic Polymer (a) has a 10000hasta MNA from 50,000 and each block of Hydrogenated butadiene Polymer (b) has an MNB from 3000 up to 30000; (c) a level of hydrogenation, such that each bloquedepolu00edmero aromu00e1t ico Hydrogenated Vinyl polymerizations has a greater than 90 percent and each Block polymer of butadiene hidrogState level of hydrogenation is greater than 95 percent; and (d) a Weight ratio of 1.2 to 1.4 libutadieno thebroad po more than 20: 80.Also, objects are described and remaining under the title.