Composition and method for producing fuel resistant liquid polythioether polymers with good low temperature flexibility

A polythioether comprising a structure having the formula:

• —R1—[—S—(CH2)2—O—[—R2—O—]m—(CH2)2—S—R1—]n—(—[R3]y—R4)2
• wherein
• R1 denotes a C2-6 n-alkylene, C3-6 branched alkylene, C6-8 cycloalkylene or C6-10 alkylcycloalkylene group, —[(—CH2—)p—X—]q—(—CH2—)r—, or —[(—CH2—)p—X—]q—(—CH2—)r— in which at least one —CH2— unit is substituted with a methyl group,
• R2 denotes a methylene, C2-6 n-alkylene, C2-6 branched alkylene, C6-8 cycloalkylene or C6-10 alkylcycloalkylene group, —[(—CH2—)p—X—]q—(—CH2—)r—, —[(—CH2—)p—X—]q—(—CH2—)r— in which at least one —CH2— is substituted with a methyl group,
• X is one selected from the group consisting of O, S and —NR6—,
• R6 denotes H or methyl,
• m is a rational number from 0 to 10,
• n is an integer from 1 to 60,
• p is an integer from 2 to 6,
• q is an integer from 1 to 5, and
• r is an integer from 2 to 10,
• y is 0 or 1,
• R3 denotes a single bond when y=0 and —S—(CH2)2—[—O—R2—]m—O— when y=1,
• R4 denotes —SH or —S—(—CH2—)2+s—O—R5 when y=0 and —CH═CH2 or —(CH2—)2—S—R5 when y=1,
• s is an integer from 0 to 10,
• R5 denotes C1-6 n-alkyl which is unsubstituted or substituted with at least one —OH or —NHR7 group, and
• R7 denotes H or a C1-6 n-alkyl group said polythioether being a liquid at room temperature and pressure.