Blends of fluoroalkyl-containing ester oligomers with polycarbodiimide(s)

A composition comprising a blend of comprising:

• (A) 50-90 wt-% of one or more oligomers wherein each oligomer comprises (i) at least one fluorine-containing repeatable unit and (ii) at least one fluorine-containing terminal group, and wherein said oligomers comprise the condensation reaction product of:
• (a) one or more fluorinated polyols selected from the group of:
• RfSO2N(CH2CH2OH)2;
• RfSO2N(R)CH2CH(OH)CH2OH;
• and
• RfCON(CH2CH2OH)2;
• wherein:
• Rf is a perfluoroalkyl group having 1 to 12 carbon atoms, or a perfluoroheteroalkyl group having 3 to about 50 carbon atoms with all perfluorocarbon chains present having 1 to 6 carbon atoms, or mixtures thereof;
• and
• R′ is an alkyl of 1 to 4 carbon atoms;
• (b) one or more polyacyl compounds containing a straight chain alkylene group of 14 to 18 carbon atoms;
• and
• (c) one or more monofunctional fluorine-containing compounds comprising a functional group that is reactive with the hydroxyl group of said polyol (a) or with the acyl group of the polyacyl compounds (b);
• wherein the monofunctional fluorine-containing compound is a compound of the following formula (II):
• RfQ′ (II)
• wherein:
• Rf is selected from the group consisting of perfluoroalkyl group having 1 to 12 carbon atoms, and perfluoroheteroalkyl group having 3 to 50 carbon atoms with all perfluorocarbon chains present having 6 or fewer carbon atoms;
• and
• Q′ is a moiety comprising a functional group that is reactive with the terminal acyl group of the polyacyl group or terminal hydroxy group of the polyol, wherein the functional group is selected from hydroxyl, oxazolinyl, oxazolonyl, acetyl, acetonyl, carboxyl, isocyanato, epoxy, aziridinyl, thio, ester, and acyl halide groups;
• wherein the ratio of component (a) to (b) to (c) is 1:0.5-0.9:0.2-1;
• and
• (B) 10-50 wt-% of one or more polycarbodiimides selected from the group of:
• PCD-1:
• 8 MDI/2 isostearylalcohol/(8ODA/HDA-HSCH2CHOHCH2OH);
• PCD-2:
• 4 MDI/isostearylalcohol/(8iBMA-HSCH2CH2OH);
• PCD-3:
• 4 MDI/0.5 isostearyl alcohol/0.5 stearylalcohol/(8 iBMA-HSCH2CH2OH);
• PCD-4:
• 4 MDI/0.5 isostearyl alcohol/0.5 behenyl alcohol/(8 iBMA-HSCH2CH2OH);
• PCD-5:
• 4 MDI/isostearyl alcohol/(4 ODA-HSCH2CH2OH);
• PCD-6:
• 5 MDI/glycerol monostearate/2 (4 MMA-HSCH2CH2OH);
• PCD-7:
• 12 MDI/(4 ODA/HDA-HSCH2CH2OH)/2 GMS;
• PCD-8:
• 12 MDI/(4 ODA/HDA-MeFBSEA-HSCH2CH2OH)/2 GMS;
• PCD-9:
• 12 MDI/(2 ODA/HDA-(2 ODI-HEMA)-HSCH2CH2OH)/2 GMS;
• PCD-10:
• 12 MDI/((4 ODI-HEMA)-HSCH2CH2OH)/2 GMS;
• PCD-11:
• 12 MDI/isostearylalcohol/(8 ODA/HDA-HSCH2CH2OH)/2 GMS;
• and
• PCD-12:
• 12 MDI/isostearylalcohol/(8 ODA/HDA-HSCH2CH2OH)/4 GMS.