Golf ball layers based on polyalkenamer / ionomer/ polyamide blends
View Patent ↗Multi-piece golf balls containing a core of at least one layer and cover of at least one layer are provided. At least one component is formed from a rubber composition comprising: i) about 10 to about 65 weight percent of a cycloalkene rubber having a trans-content of about 55% or greater and a melting point of 30° C. or greater; ii) about 30 to about 80 weight percent of an ionomeric resin; and 3) about 5 to about 40 weight percent of a polyamide. The rubber composition may further include other thermoplastic and thermosetting materials such as, for example, polybutadiene, polyisoprene, ethylene propylene rubber, ethylene propylene diene rubber, and styrene-butadiene rubber. The rubber composition helps improve resiliency, durability, scuff-resistance, and feel of the ball.
1. A method of making a golf ball, comprising a solid core of at least one layer and cover of at least one layer, comprising the steps of:
a) preparing a blend comprising cycloalkene rubber and polyamide, the cycloalkene rubber having a trans-content of about 55% or greater and a melting point of 30° C. or greater;
b) adding an acid copolymer resin to the blend, the resin comprising a copolymer of α-olefin, C 3 to C 8 α,β-ethylenically unsaturated mono- or dicarboxylic acid, and optional softening monomer; and organic acid;
c) adding a sufficient amount of cation source in-situ to the blend to neutralize the acid copolymer resin so that greater than 100% of the acid moieties in the resin are neutralized thereby forming an ionomeric resin and a blend composition comprising; i) about 10 to about 65 weight percent of the cycloalkene rubber; ii) about 30 to about 80 weight percent of the ionomeric resin; and iii) about 5 to about 40 weight percent of the polyamide; and
d) forming a solid core comprising the blend composition.
2. The method of claim 1 , wherein the resin comprising a copolymer of α-olefin, C 3 to C 8 α,β-ethylenically unsaturated mono- or dicarboxylic acid, and optional softening monomer is, partially neutralized prior to step c).
3. The method of claim 1 , wherein the blend comprising the cycloalkene rubber and polyamide further comprises peroxide in an amount of 2.5 phr or greater based on total weight of rubber.
4. The method of claim 1 , wherein the cycloalkene rubber, has a trans-content of 75% or greater and a melting point of 50° C. or greater.
5. The method of claim 1 , wherein the blend composition comprises about 30 wt. % cyclolalkene rubber; about 50 wt. % ionomer; and about 20 wt. % polyamide.
6. The method of claim 1 , wherein the blend composition comprises about 40 wt. % cyclolalkene rubber; about 40 wt % ionomer; and about 20 wt. % polyamide.
7. The method of claim 1 , wherein the blend composition comprises about 25 wt. % cyclolalkene rubber; about 50 wt % ionomer; and about 25 wt % polyamide.
8. The method of claim 1 , wherein the ionomeric resin contains greater than 16 weight percent acid groups.
9. The method of claim 1 , wherein the ionomeric resin is a E/X/Y copolymer, wherein E is ethylene; X is a C 3 to C 8 α,β-ethylenically unsaturated mono- or dicarboxylic acid; and Y is a softening monomer.
10. The method of claim 9 , wherein the copolymer is selected from the group consisting of ethylene/(meth)acrylic acid/n-butyl acrylate; ethylene/(meth)acrylic add/ethyl acrylate; ethylene/(meth)acrylic acid/methyl acrylate; ethylene/(meth)acrylic acid/n-butyl acrylate; and ethylene/(meth)acrylic acid/isobutyl acrylate copolymers.
11. The method of claim 1 , wherein the polyamide is selected from the group consisting of polyamide 6; polyamide 6,6; polyamide 610; polyamide 11; polyamide 12; and polyamide 46, and copolymers and blends thereof.
12. The method of claim 1 , wherein the polyamide is selected from the group consisting of polyamide/polyester copolymers and polyamide/polyether copolymers, and blends thereof.
13. The method of claim 1 , wherein the cation source is selected from the group consisting of metal cations and salts thereof, organic amine compounds, ammonium, and combinations thereof.
14. The method of claim 13 , wherein the cation source is a metal cation selected from the group consisting of lithium, sodium, potassium, magnesium, calcium, barium, lead, tin, zinc, aluminum, manganese, nickel, chromium, copper, and combinations thereof.