Golf ball with vapor barrier layer
A multi-layer golf ball comprising a core, a water vapor barrier layer and a cover is provided. The core may have any construction and may have multiple layers. The core may also have a solid or liquid center or wound layers, and may be constructed from a polybutadiene with mid to high Mooney viscosity. The water vapor barrier layer preferably comprises a terpolymer of ethylene, a softening acrylate class ester and methacrylic acid. th. Preferably, the water vapor barrier layer has an acid content of about 3% by weight to about 25% by weight.
1. A golf ball comprising a core, a water vapor barrier layer and a cover, wherein the water vapor barrier layer has a moisture vapor transmission rate that is lower than that of the cover and the water vapor barrier layer comprises a non-ionomeric terpolymer of ethylene, a softening acrylate class ester such as methyl acrylate, n-butyl-acrylate or iso-butyl-acrylate, and a carboxylic acid such as acrylic acid or methacrylic acid.
2. The golf ball set forth in claim 1 , wherein the terpolymer is a terpolymer of ethylene, methyl acrylate and acrylic acid.
3. The golf ball as set forth in claim 1 , wherein the acid level by weight in the terpolymer is in the range of about 3% to about 25%.
4. The golf ball as set forth in claim 3 , wherein the acid level by weight in the terpolymer is in the range of about 4% to about 15%.
5. The golf ball as set forth in claim 4 , wherein the acid level by weight in the terpolymer is in the range of about 7% to about 11%.
6. The golf ball set forth in claim 1 , wherein the terpolymer has a melt flow index in the range between about 1 gram/10 minutes to about 500 grams/10 minutes.
7. The golf ball set forth in claim 6 , wherein the melt flow index of the terpolymer is in the range of about 5 grams/10 minutes to about 20 grams/10 minutes.
8. A golf ball comprising a core, a water vapor barrier layer and a cover, wherein the water vapor barrier layer has a moisture vapor transmission rate that is lower than that of the cover and the water vapor barrier layer comprises a blend of a terpolymer of ethylene, a softening acrylate class ester, and a carboxylic acid having a melt flow index in the range of about 5–20 g/10 mm and a non-ionomeric copolymer of ethylene and methacrylic acid.
9. The golf ball as set forth in claim 8 , wherein the terpolymer is present in an amount of about 25%, 50% or 75% and the non-ionomeric copolymer is present in an amount of about 75%, 50% or 25%.