Golf ball core

1. A golf ball comprising:

a center core formed from a mixture comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of a metal salt of acrylate chemically attached to a main chain of the 1,4 polybutadiene, 0.4 to 2.5 weight percent graphene material, 1-30 weight percent polyisoprene, 10-50 weight percent zinc diacrylate, 1-30 weight percent zinc oxide, 1-20 weight percent zinc stearate, and 0.1-10 weight percent peroxide initiator; and

a cover layer disposed over the center core.

2. The golf ball according to claim 1 wherein metal salt of acrylate are zinc, magnesium, sodium, and calcium.

3. The golf ball according to claim 1 wherein the cover has a thickness ranging from 0.025 inch to 0.045 inch.

4. The golf ball according to claim 1 further comprising:

an outer core disposed over the center core;

an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.025 inch to 0.040 inch, the inner mantle layer composed of an ionomer material, the inner mantle layer material having a plaque Shore D hardness ranging from 65 to 71;

an outer mantle layer disposed over the inner mantle layer, the outer mantle layer having a thickness ranging from 0.070 inch to 0.090 inch;

and

wherein the cover layer is disposed over the outer mantle layer, the cover layer has a thickness ranging from 0.025 inch to 0.040 inch;

wherein the cover layer has a lower Shore D hardness than the outer mantle layer, the outer mantle layer has a higher Shore D hardness than the inner mantle layer, the outer core has a higher Shore D hardness than the inner mantle layer and the center core.

5. The golf ball according to claim 1 further comprising:

an outer core disposed over the center core;

an inner mantle layer disposed over the outer core, the inner mantle layer having a thickness ranging from 0.070 inch to 0.090 inch, the inner mantle layer composed of an ionomer material, the inner mantle layer material having a plaque Shore D hardness ranging from 36 to 44;

an outer mantle layer disposed over the inner mantle layer, the outer mantle layer having a thickness ranging from 0.025 inch to 0.040 inch, the outer mantle layer composed of an ionomer material, the outer mantle layer material having a plaque Shore D hardness ranging from 65 to 71; and

wherein the cover layer is disposed over the outer mantle layer, the cover layer having a thickness ranging from 0.025 inch to 0.040 inch;

wherein the cover layer has a lower Shore D hardness than the outer mantle layer, the outer mantle layer has a higher Shore D hardness than the inner mantle layer, the outer core has a higher Shore D hardness than the inner mantle layer and the center core.

6. A method for forming a core for a golf ball, the method comprising:

mixing a core material comprising 1,4 polybutadiene with a cis content more than 50% and a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of metal salt of acrylate chemically attached to a main chain of the 1,4 polybutadiene; and

compression molding a core from the core material;

wherein the core material comprises 0.4 to 2.5 weight percent graphene material further, 10-50 weight percent zinc diacrylate, 1-30 weight percent zinc oxide, 1-20 weight percent zinc stearate, and 0.1-10 weight percent peroxide initiator.

7. The method according to claim 6 wherein the core has a diameter ranging from 0.70 inch to 1.6 inch.

8. The method according to claim 6 further comprising forming a cover over the core.

9. The method according to claim 6 further comprising forming a mantle layer over the core.

10. The method according to claim 9 wherein the cover is formed of a TPU.

11. A golf ball comprising:

an inner core formed from a mixture comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of a metal salt of acrylate chemically attached to a main chain of the 1,4 polybutadiene, 0.4 to 2.5 weight percent graphene material, 1-30 weight percent polyisoprene, 10-50 weight percent zinc diacrylate, 1-30 weight percent zinc oxide, 1-20 weight percent zinc stearate, and 0.1-10 weight percent peroxide initiator;

an outer core comprising 1,4 polybutadiene with a cis content more than 50% and containing a metal salt of acrylate, wherein the 1,4 polybutadiene has 5 to 60 weight percent of metal salt of acrylate;

a mantle layer;

a cover.