| 摘要 |
PROBLEM TO BE SOLVED: To provide an elastomer member which, while having a high strength, has a good balance among cold resistance, heat resistance, and rubber elasticity and also has oil resistance. SOLUTION: This oil-resistant elastomer member has a JIS A rubber hardness of 95°or lower and an elongation at break of 100% or higher and is resistant to a high-swelling lubricating oil. The member is prepared by cross-linking a polyester urethane prepared by the polyaddition of a polyester diol and a diisocyanate. The polyester urethane has an ester group content of 25 wt.% (5.7 mmol/g) or higher but lower than 35 wt.% (8 mmol/g) and a urethane group content of 7 wt.% (1.2 mmol/g) or higher but lower than 12 wt.% (2.0 mmol/g). COPYRIGHT: (C)2003,JPO
|
