The resins and {HEAD ~ polymers} used in the invention are all well known per se, see for example {TAIL ~ the descriptions} of resins and polymers in the patents cited above, the disclosures of which are incorporated herein by this reference, to avoid unduly lengthening the present specification by describing these well known materials 
The resins and { HEAD ~ polymers } used in the invention are all well known per se , see for example { TAIL ~ the descriptions } of resins and polymers in the patents cited above , the disclosures of which are incorporated herein by this reference , to avoid unduly lengthening the present specification by describing these well known materials
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