申请人:——
公开号:US20030195293A1
公开(公告)日:2003-10-16
A breathable polyurethane having an upright moisture vapor transmission rate (MVTR) of more than about 500 gms/m
2
/24 hr comprises:
(a) poly(alkylene oxide) side-chain units in an amount comprising about 12 wt. % to about 80 wt. % of said polyurethane, wherein (i) alkylene oxide groups in said poly(alkylene oxide) side-chain units have from 2 to 10 carbon atoms and are unsubstituted, substituted, or both unsubstituted and substituted, (ii) at least about 50 wt. % of said alkylene oxide groups are ethylene oxide, and (iii) said amount of said side-chain units is (i) at least about 30 wt. % when the molecular weight of said side-chain units is less than about 600 grams/mole, (ii) at least about 15 wt. % when the molecular weight of said side-chain units is from about 600 to about 1,000 grams/mole, and at least about 12 wt. % when the molecular weight of said side-chain units is more than about 1,000 grams/mole, and
(b) poly(ethylene oxide) main-chain units in an amount comprising less than about 25 wt. % of said polyurethane.
Coatings and films for textiles and other articles and applications using such polyurethanes have excellent breathability, i.e., high moisture vapor transmission rates (MVTR).
直立湿气透过率 (MVTR) 超过约 500 克/米的透气聚氨酯
2
/24小时的透气聚氨酯包括
(a) 聚(环氧烷)侧链单元,其用量占所述聚氨酯的约 12 重量%至约 80 重量%,其中 (i) 所述聚(环氧烷)侧链单元中的环氧烷基具有 2 至 10 个碳原子,并且是未取代、取代或未取代和取代的,(ii) 至少约 50 重量%的所述环氧烷基是环氧乙烷,以及 (iii) 至少约 50 重量%的所述环氧烷基是环氧丙烷。(iii) 所述侧链单元的量为:(i) 当所述侧链单元的分子量小于约 600 克/摩尔时,至少约 30 重量%;(ii) 当所述侧链单元的分子量为约 600 至约 1,000 克/摩尔时,至少约 15 重量%;当所述侧链单元的分子量大于约 1,000 克/摩尔时,至少约 12 重量%,以及
(b) 聚环氧乙烷主链单元,其含量小于所述聚氨酯的约 25 wt.%。
使用此类聚氨酯的纺织品及其他物品和应用的涂层和薄膜具有极佳的透气性,即高湿气透过率(MVTR)。