Nylon 12, nylon 12 composition, method for producing nylon 12 and tubular molded product using nylon 12

摘要

Disclosed is a member of nylon 12 having a relative viscosity of from 1.9 to 3.5 when measured in 98% sulfuric acid at a concentration of 10 g/dm³ and at 25°C and a melt flow rate of 0.1 g/10 min. or more when measured at 235°C under a load of 2,160 g, wherein said relative viscosity and said melt flow rate have a relationship of the following formula (I):$$\begin{gathered} \mathop{\mathrm{image}} \[ {\text{2.87 x 10}}^{\text{3}}{\text{exp (-3.48 η}}_{\text{r}}\text{) ≤ MFR} \\ {\text{≤ 3.25 x 10}}^{\text{4}}{\text{exp (-3.48 η}}_{\text{r}}\text{)} \] \end{gathered}$$ wherein η_r is relative viscosity and MFR is melt flow rate. The nylon 12 has excellent extrusion moldability and creep characteristics, fatigue characteristics and the like mechanical properties and is suited for tubular molds. Anylon 12 composition comprising the nylon 12 having the above-described specific relationship between η_r and MFR and a plasticizer is also disclosed.