Polyamide resin composition having high melt point and being excellent in anti-vibration property upon water absorption
申请人:TOYOBO CO., LTD.
公开号:US10072137B2
公开(公告)日:2018-09-11
The present invention provides a polyamide resin composition having high melt point which can produce a molded product having high anti-vibration property or, in other words, having very high resonance frequency and, in particular, being capable of retaining high resonance frequency even upon water absorption. A polyamide resin composition, comprising a polyamide resin (A) having melt point (Tm) of 290° C. to 350° C. and having crystallization temperature upon temperature rise (Tc1) of 80 to 150° C., and glass fibers (B) having cross-sectional area of 1.5 to 5.0×10−6 cm2, characterized in that, ratio by weight of the polyamide resin (A) to the glass fibers (B) [(A):(B)] is from 20:80 to 35:65, and that the polyamide resin (A) is a copolymerized polyamide consisting of 55 to 75 molar % of a constituent unit (a) obtained from an equimolar salt of hexamethylenediamine and terephthalic acid, and 45 to 25 molar % of a constituent unit (b) obtained from 11-aminoundecanoic acid or undecane lactam.
本发明提供了一种具有高熔点的聚酰胺树脂组合物,该组合物可生产出具有高抗 振性或换言之具有极高共振频率的模制产品,特别是即使在吸水后仍能保持高共振频率。一种聚酰胺树脂组合物,包括熔点(Tm)为 290°C 至 350°C,升温后结晶温度 (Tc1)为 80°C 至 150°C的聚酰胺树脂(A)、和玻璃纤维 (B) 的横截面积为 1.5 至 5.0×10-6 cm2,其特征在于,聚酰胺树脂(A)与玻璃纤维(B)的重量比[(A):(B)]为 20:80 至 35:65,聚酰胺树脂(A)是一种共聚聚酰胺,由55至75摩尔%的由己二胺和对苯二甲酸的等摩尔盐得到的组成单元(a)和45至25摩尔%的由11-氨基十一烷酸或十一烷内酰胺得到的组成单元(b)组成。