THERMOFUSIBLE COMPOSITION FOR SLUSH MOULDING

摘要

A thermofusible composition in the form of pellets and/or powder, with a particle size of 1400 µm or less comprising from about 40 to about 70 weight percent of a selectively hydrogenated styrenic block copolymer (HSBC), and from about 1 to about 30 weight percent of a butylene homopolymer, a butylene copolymer, or a combination of the butylene homopolymer and the copolymer, wherein the HSBC (i) is a linear or branched hydrogenated block copolymer having the general configuration A-B-A, (A-B)n, (A-B-A)n, (A-B-A)nX, (A-B)nX or mixtures thereof, where n is an integer from 2 to about 30, and X is coupling agent residue and wherein: a. prior to hydrogenation each A block is a mono alkenyl arene polymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono alkenyl arene; b. subsequent to hydrogenation about 0-10% of the arene double bonds have been reduced, and at least about 90% of the conjugated diene double bonds have been reduced; c. each A block has a number average molecular weight from about 5.0 to about 7.5 kg/mol and, wherein the linear HSBC has a total number average molecular weight from about 70 to about 150 kg/mol and the branched HSBC has a total apparent number average molecular weight from about 35 to about 75 kg/mol per arm d. each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono alkenyl arene units; e. the total amount of mono alkenyl arene in the hydrogenated block copolymer is from about 20 to about 45 weight percent; f. the weight percent of mono alkenyl arene in each B block is from about 10 to about 40 weight percent; g. each B block has a styrene blockiness index of less than 10 percent; and h. the weight percent of vinyl in each B block is at least about 40 weight percent.