A combustible polymeric material containing urethane linkages which has incorporated therein, as smoke and toxic gas suppressant, a polyester having an acid value below 30mg KOH/g derived from
(A) a polycarboxylic component comprising (A1) at least one aliphatic dicarboxylic acid having up to 6 carbon atoms which is unsaturated or is hydroxy-substituted, or an ester-forming derivative thereof and, optionally, one or more dicarboxylic or tricarboxylic acids or ester-forming derivatives thereof selected from (A2) a saturated aliphatic acid having 2 to 10 carbon atoms which is free from hydroxyl substituents, or ester-forming derivative thereof, (A3) citric acid or ester-forming derivative thereof, (A4) a cycloaliphatic acid having 7 to 12 carbon atoms or ester-forming derivative thereof and (A5) an aromatic acid having 8 to 16 carbon atoms or ester-forming derivative thereof, said polycarboxylic component being substantially free from tetracarboxylic acids or anhydrides thereof, and
(B) at least one polyhydroxyl component having 2 to 8 hydroxyl groups.
一种含有聚
氨酯链节的可燃聚合材料,其中含有一种酸值低于 30mg KOH/g 的聚酯作为烟雾和有毒气体
抑制剂,这种聚酯来源于
(A) 聚
羧酸组分,包括 (A1) 至少一种具有最多 6 个碳原子的不饱和或羟基取代的脂肪族二
羧酸或其酯形成衍
生物,以及可选的一种或多种二
羧酸或
三羧酸或其酯形成衍
生物,选自 (A2) 具有 2 至 10 个碳原子且不含羟基取代基的饱和脂肪族酸、(A3)
柠檬酸或其
酯类衍
生物; (A4) 具有 7 至 12 个碳原子的环脂族酸或其
酯类衍
生物; (A5) 具有 8 至 16 个碳原子的芳香族酸或其
酯类衍
生物,所述聚
羧酸组分基本上不含四
羧酸或其酸酐,以及
(B) 至少一种具有 2 至 8 个羟基的多羟基成分。