MODIFIED DISULFIDE POLYMER COMPOSITION AND METHOD FOR MAKING SAME FROM MERCAPTAN TERMINATED DISULFIDE POLYMER AND DIETHYL FORMAL MERCAPTAN TERMINATED POLYSULFIDE

摘要

60-227FMODIFIED DISULFIDE POLYMER COMPOSITIONAND METHOD FOR MAKING SAMEABSTRACT OF THE DISCLOSUREA liquid polymer composition curable to a solidelastomer having good thermal stability which contains amercaptan terminated disulfide polymer of the formulaHS(RSS)mR'SH wherein R is -C2H4-O-CH2-O-C2H4-; R' is amember selected from the group consisting of alkyl offrom 2 to 12 carbon atoms; alkyl thioether of from 4 to20 carbon atoms; alkyl ether of from 4 to 20 carbon atomsand one oxygen atom; alkyl ether of from 4 to 20 carbonatoms and from 2 to 4 oxygen atoms each of which isseparated from the other by at least 2 carbon atoms,alicyclic of from 6 to 12 carbon atoms and aromatic loweralkyl; and the value of m is such that mercaptanterminated disulfide polymer has a molecular weight ofbetween 1,000 to about 4,000. The method includescleaving a polymer having disulfide linkages with anorganic dimercaptan in the presence of an organic amine.