Patent ID: 11965843
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A chemical bond evaluation method comprising the steps of:
performing multidimensional solid-state nuclear magnetic resonance (NMR) analysis on a rubber composition comprising a rubber component, a silica, and a silane coupling agent by using the multidimensional NMR apparatus;
using 29Si solid-state nuclear magnetic resonance, as at least part of the multidimensional NMR apparatus, in at least one dimension of the multidimensional solid-state nuclear magnetic resonance;
generating an NMR spectrum, wherein in the NMR spectrum, a vertical axis represents a 29Si DQ chemical shift axis and a horizontal axis represents a 29Si SQ chemical shift axis;
evaluating a presence or absence of a chemical bond between the silica and the silane coupling agent in the rubber composition according to the generated NMR spectrum; and
detecting a cross peak representing the silica in a state forming a chemical bond with the silane coupling agent in the NMR spectrum based on the interaction between the vertical axis represents the 29Si DQ chemical shift axis and the horizontal axis represents the 29Si SQ chemical shift axis.