THERMOFUSIBLE COMPOSITION FOR SLUSH MOULDING Russian patent published in 2015 - IPC C08L53/02 B29C41/04 B60K37/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a thermofusible composition based on a thermoplastic elastomer. The thermofusible composition is in the form of a powder and/or in the form of micropellets, with a particle size of 1400 mcm, comprising 40-70 wt % selectively hydrogenated block copolymer (HSBC); 8.5-15 wt % of a propylene homopolymer and/or propylene copolymer; 1-30 wt % of a butylene homopolymer, of a butylene homopolymer or a combination of the butylene homopolymer and the butylene copolymer and 7.7-20 wt % of a plasticizing oil selected from naphthenic oils and paraffinic oils, 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 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 5.0-7.5 kg/mol, and, wherein the linear HSBC has a total apparent number average molecular weight from about 70 to 150 kg/mol, and the branched HSBC has a total apparent number average molecular weight from about 35 to 75 kg/mol and the branched HSBC has a total apparent number average molecular weight from about; 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 45 wt %; f) the amount of mono alkenyl arene in each B block is from about 10 to 40 wt %; g) each B block has a styrene blockiness index of less than 10% and h) the weight percent of vinyl in each B block is at least about 40 wt %.

EFFECT: composition can be used at lower processing temperatures and reduced cycle times in conventional equipment.

18 cl, 3 dwg, 6 tbl, 11 ex