plates for drilling are introduced the auxiliary plates are made by coating the photosensitive resin composition on aluminum foil and photocuring the coated resin to make the resin bonded on the aluminum foil the resin composition comprises a first polymer formed by the reaction of 1 2 4 5 pyromellitic dianhydride and polyetheramine and a second polymer formed by the reaction of polyetheramine and vinyl chloride wherein the second polymer is a photosensitive polymer the novel resin composition provided by the present invention can be coated on drilling auxiliary plates when the drilling auxiliary plates coated with the resin composition are used in a drilling process it can avoid the coated resin being cracked due to the heat caused by friction of high speed drilling so it can further enhance the stability accuracy and precision of drilling application_number US 201414449117 A description in order to make the purpose features and effects of the invention fully understood the invention is described in detail by the following embodiments the description is shown as follows the resin compositions and the drilling auxiliary plates for pcbs of the present invention are described in detail in the following examples 1 u02dc 3 in addition the effects of the resin compositions and the drilling auxiliary plates of pcbs of the present invention are compared with the effects of the compositions of comparative.