2,2-Bis(methylol)propionic acid homopolymer, ester with polyethylene glycol ether with pentaerythritol (4:1) 2,2-Di(hydroxymethyl)propionic acid homopolymer ester with ethoxylated pentaerythritol 2,2-Di(hydroxymethyl)propionic acid-ethoxylated pentaerythritol copolymer 2,2-Dimethylolpropionic acid homopolymer ethoxylated pentaerythritol ester ALH 64OH BH 20 BH 30 BH 40 Boltorn H 20 Boltorn H 30 Boltorn H 40 Boltorn H 40s H 20 H 40 Hyperbranched bis-MPA polyester-64-hydroxyl Perstorp H 20 Perstorp H 30 Perstorp H 40 PFH 64OH Propanoic acid, 3-hydroxy-2-(hydroxymethyl)-2-methyl-, homopolymer, ester with α-hydro-ω-hydroxypoly(oxy-1,2-ethanediyl) ether with 2,2-bis(hydroxymethyl)-1,3-propanediol (?:4:1)