Soft thermoplastic elastomers

1. A thermoplastic vulcanizate composition comprising:

a) from about 2-10 wt %, based upon total polymer content weight a)+b)+c), of a thermoplastic polyethylene or polypropylene homopolymer, or ethylene-propylene copolymer, or copolymer that includes ethylene or propylene together with one or more C 4 to C 20 α-olefins, said thermoplastic having at least 25% crystallinity by DSC;

b) from about 15 to about 36 wt. %, based upon total polymer content weight a)+b)+c), of a thermoplastic ethylene-α-olefin random or block copolymer having less than 5% crystallinity by DSC;

c) from about 60 to about 80 wt. %, based upon total polymer content weight a)+b)+c), of a cross-linked elastomer; and

d) from about 50 to about 65 wt %, based upon total composition weight a)+b)+c)+d), of a process oil;

wherein said thermoplastic vulcanizate composition has a Shore A Hardness of less than 35 and wherein the relative amount of b) to a)+b) is greater than 75 wt % and less than or equal to 90 wt. %.

2. The composition of claim 1 , wherein the thermoplastic ethylene-α-olefin random or block copolymer has a number-average molecular weight (M n ) of at least 25,000.

3. The composition of claim 1 , wherein the cross-linked elastomer is selected from the group of EADM and butyl rubber.

4. The composition of claim 1 , wherein not more than 5% of the cross-linked elastomer is extractable.

5. A molded article comprising the thermoplastic vulcanizate of claim 1 .

6. The composition of claim 1 wherein the relative amount of b) to a) is from about 80 wt. % to less than or equal to 90 wt. %.

7. The composition of claim 1 wherein the relative amount of b) to a) is from about 84 wt. % to less than or equal to 90 wt. %.