Structurally isomeric polyalkylethylene polymers

摘要

Structurally isomeric poly(alkylethylenes) (SI-PAE) with improved processability and reduced melt instability, containing H and Y structures and with a theta index of 2-8 x 10<-3> kJ/mol/deg; theta = Tm . DELTA Hm . beta . s . Tg<-1>, where Tm = m.pt. (K), DELTA Hm = heat of fusion (kJ/mol), beta = coefficient of linear thermal expansion at 25 deg C (1/deg), s = swelling index (extruded string diameter of SI-PAE/string diameter of unmodified PAE in MFI determination as in ISO 1131), Tg = glass transition pt. (K). PAE with H and Y structures are macromers of formula (MeCH2((CH2CR3R2)t (CH2CR4R5)u)yCH2CR1CH2CR1R2((CH2CR4R5)u)zCH2CR3R2H)2 (I) and MeCR3R2((CH2CR3R2)t (CH2CR4R5)u)yCH2CR1(Y)CH2CR1R2((CH2CR3R4)u(CH2CR4R5)t)zCH2 CR3R2H (II) respectively, in which R1 = 1-4C alkyl; R2 = H, t/u = 0.03-30; R3 = 1-4C alkyl or H; R4 = H, 1-4C alkyl, halogen or aryl, especially Ph; R5 = H or 1-4C alkyl; y + z = 150-3000; w = 250-5000; tau is a polymeric bridging segment based on acrylic acid (AA), 4-12C acrylic acid derivatives, 3-21C allyl compounds, 8-14C diacrylates, 7-16C diallyl compounds, 4-10C dienes, 9-15C dimethacrylates, 7-10C divinyl compounds, 3-16C monovinyl compounds, 12-17C polyacrylates, 15-21C polymethacrylates and/or 9-12C triallyl compounds; the amount of bridging segment ( tau ) in the modified PAE is 0.1-5 wt%. Also claimed are (i) mixtures of PAE and (ii) processes for the production of SI-PAE as above.