https://data.epo.org/publication-server/rest/v1.2/publication-dates/19891011/patents/EP0336716NWA2/document.html
Lactone modified viscosity modifiers useful in oleaginous compositions - Patent 0336716
Lactone modified viscosity modifiers useful in oleaginous compositions - Patent 0336716
viscosity modifierslactonemodifiedusefuloleaginous