Sliding element for lubricated sliding system

A lubricated drive system comprising:

• a chain;
• a sliding element having a surface layer in sliding contact with the chain in the lubricated drive system, wherein the surface layer is formed of a polymeric material comprising:
• (A) a matrix polymer, and
• (B) optionally at least one other component dispersed in and/or blended with the matrix polymer, wherein
• the matrix polymer consists of a semi-crystalline polyamide (SCPA) having a tensile modulus at 140° C. of at least 800 MPa as measured according to ISO 527-1A, and wherein
• the SCPA comprises:
• (A.1) a semi-crystalline aliphatic polyamide having a glass transition temperature (Tg) of at least 80° C. and a melting enthalpy (AH) of at least 70 J/g, and
• (A.2) 0.01-10 wt. %, relative to the total weight of the polymeric material, of a semi-crystalline semi-aromatic polyamide having a glass transition temperature (Tg) of at least 110° C. and a melting enthalpy (ΔH) of at least 70 J/g, and wherein
• the surface layer has a coefficient of friction (CoF) in a range of 0.005-0.07 as measured in lubrication oil Shell Helix Super Mineral Motor Oil 15W-40 at a contact temperature of 140° C., a nominal contact pressure of 1 MPa and a sliding speed of 1 m/s.

A power train drive system comprising:

• an engine,
• a transmission differential,
• a drive shaft system,
• a drive chain, and
• a plastic component, wherein
• the plastic component comprises a surface layer in lubricating contact with the drive chain, wherein
• the surface layer is formed of a polymeric material which comprises:
• (A) a matrix polymer, and
• (B) optionally at least one other component dispersed in and/or blended with the matrix polymer, wherein
• the matrix polymer consists of a semi-crystalline polyamide (SCPA) having a tensile modulus at 140° C. of at least 800 MPa as measured according to ISO 527-1A, wherein
• the SCPA comprises:
• (A.1) a semi-crystalline aliphatic polyamide having a glass transition temperature (Tg) of at least 80° C. and a melting enthalpy (ΔH) of at least 70 J/g, and
• (A.2) 0.01-10 wt. %, relative to the total weight of the polymeric material, of a semi-crystalline semi-aromatic polyamide having a glass transition temperature (Tg) of at least 110° C. and a melting enthalpy (ΔH) of at least 70 J/g, and wherein
• the surface layer has a coefficient of friction (CoF) in a range of 0.005-0.07 as measured in lubrication oil Shell Helix Super Mineral Motor Oil 15W-40 at a contact temperature of 140° C., a nominal contact pressure of 1 MPa and a sliding speed of 1 m/s.