首页> 外国专利> Biodegradable thermoplastic polyurethane filaments for incontinence articles - obtd from reaction prod of mixt of aliphatic polyester-poly:ol and polyether-poly:ol with aliphatic poly:isocyanate and diol chain extender for nappies and sanitary towels.

Biodegradable thermoplastic polyurethane filaments for incontinence articles - obtd from reaction prod of mixt of aliphatic polyester-poly:ol and polyether-poly:ol with aliphatic poly:isocyanate and diol chain extender for nappies and sanitary towels.

机译:用于失禁物品的可生物降解的热塑性聚氨酯长丝-由脂族聚酯-多元醇和聚醚-多元醇与脂族聚异氰酸酯和用于尿布和卫生巾的二醇扩链剂的混合物的反应产物制得。

摘要

The thermoplastic polyurethane (TPU) filaments (I) are claimed. (I) are obtd by reacting (A) 100 pts wt polyol mixt with (B) 1,6-hexamethylene di-isocyanate (HDI), IPDI or dicyclohexyl methane-4,4'-di-isocyanate (DCMDI) and (C) 1,4-butanediol and/or 1,6-hexane diol chain extender, with NCO index (NI)= 97-99, equiv ratio (B):(A)= (2.8:1.0)-(12.0:1.0) and equiv ratio (C):(A)= (1.75:1.0)-(11.3:1.0) (with NI= equiv ratio (NCO)/(total OH in A and C) x 100). Mixt (A) contains 70-90 pts wt polyester-polyol with mol wt 2000 based on adipic acid and ethane-diol, butane diol, hexane diol, diethylene glycol or neopentyl glycol, and 10-30 pts wt polyether-polyol based on PEG with mol wt 800-4000. USE/ADVANTAGE - Used for the prodn of incontinence articles (claimed). (I) are biodegradable, elastic filaments made of melt-spinnable TPU. Prods mfd from (I) (eg nappies, sanitary towels) are completely decomposed after 8 weeks on a rubbish tip by hydrolysis of the polyester segments (even at 23 deg C and 30% RH), followed by degradation by enzymes and micro organisms; without hydrophilic polyether gps in the TPU flexible segment, 4 months is required for a significant redn in strength, with no noticeable degradation of the polyurethane. The use of sub-stoichiometric amts of isocyanate (NI= 97-99), and the 1-stage method of prepn, rules out side reactions giving gelled, partly-crosslinked polymer and ensures a perfect melt flow for the spinning process.
机译:要求保护热塑性聚氨酯(TPU)长丝(I)。 (I)通过使(A)100 pts wt多元醇混合物与(B)1,6-六亚甲基二异氰酸酯(HDI),IPDI或二环己基甲烷-4,4'-二异氰酸酯(DCMDI)和(C )1,4-丁二醇和/或1,6-己二醇扩链剂,NCO指数(NI)= 97-99,当量比(B):( A)=(2.8:1.0)-(12.0:1.0)和当量比(C):( A)=(1.75:1.0)-(11.3:1.0)(其中NI =当量比(NCO)/(A和C中的总OH)x 100)。混合物(A)包含70-90 pts wt聚酯多元醇和mol wt 2000,基于己二酸和乙烷-二醇,丁二醇,己二醇,二甘醇或新戊二醇,以及10-30 pts wt聚醚多元醇(基于PEG)摩尔重量为800-4000。使用/优势-用于失禁物品的产品(已声明)。 (I)是由可熔融纺丝的TPU制成的可生物降解的弹性长丝。 (I)中的产品(例如尿布,卫生巾)在8周后在垃圾尖端被聚酯片段水解(即使在23摄氏度和30%相对湿度下)完全分解,然后被酶和微生物降解;在TPU柔性链段中没有亲水性聚醚gps的情况下,需要4个月的时间才能显着提高强度,并且不会引起聚氨酯的明显降解。使用亚化学计量的异氰酸酯(NI = 97-99)和prepn的1阶段方法,可避免产生凝胶化,部分交联的聚合物的副反应,并确保纺丝过程中的熔体流动完美。

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