INTERNATIONAL SEARCH REPORT PCT/US2020/024198 A. CLASSIFICATION OF SUBJECT MATTER INV. C08G18/10 C08G18/48 C08G18/76 C09J175/08 C08G18/50 C08G18/54 ADD. According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) C08G C09J Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) EPO-Internal , WPI Data C. DOCUMENTS CONSIDERED TO BE RELEVANT Category * Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. x US 3 655 619 A (SELLET LUCI EN) 1-13 11 Apri l 1972 (1972-04-11) A col umn 1, l i nes 15-19 14, 15 col umn 2 , l i nes 32-43 col umn 10, l i nes 8-15 ; exampl e VI A GB 1 150 508 A (UPJOHN CO [US] ) 1-15 30 Apri l 1969 (1969-04-30) page 1, l i nes 11-32 page 3 , l i nes 24-57 ; exampl es 3 , 7 A US 5 059 670 A (HARRIS STEPHEN H [US] ) 1-15 22 October 1991 (1991-10-22) col umn 1, l i nes 7-14 col umns 26-19 col umn 3 , l i nes 21-25 ; exampl e 12 □ Further documents are listed in the continuation of Box C. * See patent family annex. Special categories of cited documents : "T" later document published after the international filing date or priority "A" document defining the general state of the art which is not considered date and not in conflict with the application but cited to understand to be of particular relevance the principle or theory underlying the invention Έ " earlier application or patent but published on or after the international filing date "X" document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive "L" document which may throw doubts on priority claim(s) orwhich is step when the document is taken alone cited to establish the publication date of another citation or other special reason (as specified) Ύ " document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is "O" document referring to an oral disclosure, use, exhibition or other combined with one or more other such documents, such combination means being obvious to a person skilled in the art "P" document published prior to the international filing date but later than the priority date claimed document member of the same patent family Date of the actual completion of the international search Date of mailing of the international search report 9 July 2020 17/07/2020 Name and mailing address of the ISA/ Authorized officer European Patent Office, P.B. 5818 Patentlaan 2 NL - 2280 HV Rijswijk Tel. (+31-70) 340-2040, Fax: (+31-70) 340-3016 Ei gner, Markus Form PCT/ISA/210 (second sheet) (April 2005) International application No