English to Italian Law/Patents Chemistry; Chem Sci/Eng preparazione mescole di gomma

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Certain phenolic and resorcinolic novolak resin blends comprise (a) o-o’ phenolic methylene linkages in the range of about 25 to 96%; (b) o-p’ phenolic methylene linkages in the range of about 4 to 50%; (c) combined o-o’ phenolic methylene linkages and 4-4’ resorcinolic methylene linkages in the range of about 10-90%; and (d) p-p’ phenolic methylene linkages in the range of about 1 to 30%.

Certain resin blends made by the process comprise (1) o-o’ phenolic methylene linkages in the range of about 25 to 98%; (2) o-p’ phenolic methylene linkages in the range of about 4 to 50%; (3) p-p’ phenolic methylene linkages in the range of about 1 to 30%; and (4) combined oo’ phenolic methylene linkages and 4-4’ resorcinolic methylene linkages in the range of about 10 to 90%.

It is preferred that the ortho-ortho (o-o’) phenolic methylene bridge constitutes from about 25% to about 96%, and more preferably from about 30% to about 80%. The total number of oo’ phenolic methylene bridges and 4-4’ resorcinolic methylene bridges present in the resin may vary from about 10% to about 90%, preferably from about 40% to about 80%. Preferably, from about 1% to about 30% of the total number of phenolic methylene linkages are coupled at the para-para (p-p’) position. At least 25% of the phenolic methylene linkages in the resulting resin is o-o’, and at least a minor portion of the total number of phenolic methylene linkages is p-p’.



"Legami metilen-fenolici o-o'?" o come traducono in francese nello stesso testo "Legami di metilene fenolici o-o'?"
O altro??
Grazie, francesca