OIL-RESISTANT ELASTOMER MEMBER

• Main Author: SHIRASAKA HITOSHI
• Format: Patent
• Language: English
• Published: 30.07.2003
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

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