Compositions comprising propylene-based elastomers and polyalphaolefins

A composition comprising from about 0.5 to about 60 wt % of a polyalphaolefin and 40 to 99.5 wt % of a propylene-based elastomer, based on the weight of the composition, and a β-nucleating agent,

• wherein the propylene-based elastomer comprises propylene-derived units and 5 to 30 wt % of α-olefin-derived units and where the propylene-based elastomer has a melting temperature of less than 120° C. and a heat of fusion of less than 75 J/g;
• wherein the polyalphaolefin has a kinematic viscosity (KV) at 100° C. of from 3 to 3000 cSt;
• wherein the β-nucleating agent is selected from:
• (i) amide compounds of formula (1):
• R2—NHCO—R1—CONH—R3 (1)
• wherein R1 is a residue of a C3-20 saturated or unsaturated aliphatic dicarboxylic acid, a residue of a C6-30 saturated or unsaturated alicyclic dicarboxylic acid or a residue of a C8-30 aromatic dicarboxylic acid;
• R2 and R3 are the same or different and each represents a C3-12 cycloalkyl group, a C3-12 cycloalkenyl group, or a group of the formula
• wherein R4 is a hydrogen atom, a C1-12 straight- or branched-chain alkyl group, a C2-12 straight- or branched chain alkenyl group, a C6-10 cycloalkyl group or a phenyl group;
• R5 is a C1-12 straight- or branched-chain alkyl group, a C2-12 straight- or branched-chain alkenyl group, a C6-10 cycloalkyl group or a phenyl group;
• and R6 and R7 each represents a C1-4, straight- or branched-chain alkylene group;
• with the proviso that when R4 is a hydrogen atom, a C1-12 alkyl group or a C6-10 cycloalkyl group, R1 is a residue of a C6 or C8 saturated aliphatic dicarboxylic acid
• (ii) amide compounds of formula (2):
• R9—CONH—R8—NHCO—R10 (2)
• wherein R8 is a residue of a C4-28 alicyclic diamine, a residue of a C4-14, heterocyclic diamine or a residue of a C6-28 aromatic diamine;
• R9 and R10 are the same or different and each represents a C3-12 cycloalkyl group, a C3-12 cycloalkenyl group, or a group of the formula
• wherein R11 is a hydrogen atom, a C1-12 straight- or branched-chain alkyl group, a C2-12 straight- or branched chain alkenyl group, a C6-10 cycloalkyl group or a phenyl group;
• R12 is a C1-12 straight- or branched-chain alkyl group, a C2-12 alkenyl group, a C6-10 cycloalkyl group or a phenyl group;
• and R13 and R14 each represents a C1-4 straight- or branched-chain alkylene group;
• with the proviso that R8 is not
• or
• (iii) amide compounds of formula (3):
• R16—CONH—R15—CONH—R17 (3)
• wherein R15 is a residue of a C2-29 saturated or unsaturated aliphatic amino acid, a residue of a C7-13 saturated or unsaturated alicyclic amino acid or a residue of a C7-15 aromatic amino acid;
• R16 and R17 are the same or different and R16 has the same meaning as R9 or R10 in the formula (2) and R17 has the same meaning as R2 or R3 in the formula (1),
• wherein the composition is pelletized and the pelletized composition is dusted with an ethylene-based polymer.