Hydrogenated poly (Butadiene) block copolymer comprising polymer blends

The invention provides a chemical resistant composition comprising at least:- (a) 100 parts by weight of a hydrogenated (poly)butadiene block copolymer BDB or ÄB EÜnwherein each of the blocks B and B comprises a substantially linear, substantially pure polyethylene block, having a number average molecular weight (Mn) in the range of from 5,000 to 250,000; D and E are substantially linear elastomeric polymer blocks, being substantially free from olefinic unsaturation, and having a number of average molecular weight in the range of form 10,000 to 400,000, the weight distribution (Mw/Mn) of the blocks, B, BDB, B E is 2; (b) from 20 to 100 parts by weight of a predominantly paraffinic and/or naphthenic extender oil; and (c) from 20 to 200 parts by weight of a homopolymer or copolymer of olefins having from 2 to 20 carbon atoms. The composition is are in particular to be used under the bonnet of automotives.