Curable silicone compositions containing additives

A curable composition comprising (A) at least one polyorganosiloxane containing at least one terminal group of the formula (I):

• -A-Si(R1)m(R2)n(R3)3−(m+n) (I)
• wherein:
• A is a bond, —O— or a linear, branched or cyclic divalent group selected from hydrocarbon residues having 1 to 12 carbon atoms, alkylene, arylene, oxyalkylene, oxyarylene, siloxane-alkylene, siloxane-arylene, ester, amine, glycol, imide, amide, alcohol, carbonate, urethane, urea, sulfide, ether or a derivative or combination thereof;
• each R1 is independently selected from the group consisting of hydrogen, halogen, amino, oximino, a substituted or unsubstituted alkyl, alkenyl, alkenyloxy, alkynyl, alkylnyloxy, cycloaliphatic, cycloaliphatic-O—, aryl, aryloxy, heteroaryl, heteroaryloxy, heteroalicyclic, heteroalicyclicoxy, acyl, acyloxy group or a combination thereof;
• each R2 is independently a group of the general formula (2):
• —O—Y—COOR4 (2)
• wherein
• Y is a substituted or unsubstituted (hetero)aromatic group having 4 to 14 ring atoms, a substituted or unsubstituted saturated or partially unsaturated 4- to 14-membered (hetero)cyclic group or —(C(R5)2)o—;
• R4 is a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof;
• each R5 is independently selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic or aryl group;
• and
• is an integer from 1 to 10;
• each R3 independently is a group of the general formula (3):
• —O—Y—CONR6R7 (3)
• wherein
• Y is as defined above;
• R6 is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl, alkenyl, alkynyl cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof or R7;
• R7 is a group of the general formula (4):
• —R8—SiR9p(OR10)3-p (4)
• wherein
• R8 is an alkylene group, optionally interrupted by a heteroatom;
• each R9 is independently selected from the group consisting of hydrogen, halogen, amino, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof;
• each R10 is independently selected from the group consisting of a substituted or unsubstituted alkyl, alkenyl, alkynyl, or acyl group;
• each p independently stands for 0, 1, or 2;
• m is independently 0, 1 or 2;
• and
• n is independently 1, 2, or 3, wherein the sum n+m is a maximum of 3;
• (B) at least one adhesion promoter;
• (C) at least one curing catalyst;
• (D) at least one additive having an aldehyde functional moiety of formula (III)
• R31—C(═O)—R32 (III)
• wherein
• R31 is a substituted or unsubstituted C6-14 aryl;
• and
• R32 is hydrogen,
• wherein the additive of formula (III) comprises up to 24 carbon atoms:
• (E) at least one plasticizer;
• and
• (F) at least one filler,
• wherein the composition exhibits a decreased skin-over time and an increased elongation at break directly after mixing, and after storage for 8 weeks at 40° C. and 80% humidity, relative to an otherwise equivalent composition that does not comprise the at least one additive (D) and wherein the composition is room temperature curable.