GOLF BALL WITH EXCELLENT INTERLAYER ADHESION BETWEEN ADJACENT DIFFERING LAYERS
Golf ball and method for making it, comprising a first layer that comprises a first polymeric composition and is surrounded by and adjacent to a second layer comprising a second polymeric composition different than the first polymeric composition; with one of these layers further comprising at least one silane-containing adhesion promoter such as organosilanes and/or organosiloxanes throughout in an amount of from about 0.1 wt. % to about 5.0 wt. % of the entire layer. Neither layer is surface treated with at least one silane-containing adhesion promoter. The second layer may be the layer comprising the silane-containing adhesion promoter throughout, surrounded by a third layer that comprises a third polymeric composition that differs from the second polymeric composition and does not incorporate any silane-containing adhesion promoter. Strong interlayer bonding is therefore created both between the second layer and the first layer and between the second layer and the third layer.
1 . A golf ball comprising a first layer that consists of a thermoset rubber composition and is surrounded by and adjacent to a second layer consisting of an ionomer composition;
wherein only the thermoset rubber composition of the first layer comprises at least one silane-containing adhesion promoter throughout and in an amount of from about 0.1 wt. % to about 5.0 wt. %; and
wherein the first layer and the second layer are not surface treated with any adhesion promoter at an interface between the first layer and second layer.
2 . The golf ball of claim 1 , wherein the at least one silane-containing adhesion promoter is selected from the group consisting of organosilanes and organosiloxanes.
3 . The golf ball of claim 1 , wherein the first layer is an inner core and the second layer is an outer core layer.
4 . The golf ball of claim 1 , wherein the first layer surrounds an inner core comprising polybutadiene.
5 . The golf ball of claim 1 , wherein the first layer surrounds an inner core comprising a thermoplastic composition.
6 . The golf ball of claim 1 , wherein the thermoplastic composition comprises an ionomer.
7 . The golf ball of claim 1 , wherein the at least one silane-containing adhesion promoter has at least two functional groups.
8 . The golf ball of claim 1 , wherein the second layer is surrounded by and adjacent to a third layer comprising a thermoset polyurethane composition wherein the third layer further comprises at least one silane-containing adhesion promoter throughout and in an amount of from about 0.1 wt. % to about 5.0 wt. %; and wherein the second layer and the third layer are not surface treated with any adhesion promoter at an interface between the second layer and the third layer.
9 . A golf ball comprising a first layer that consists of a thermoset rubber composition and is surrounded by and adjacent to a second layer consisting of an ionomer composition;
wherein only the ionomer composition of the second layer comprises at least one silane-containing adhesion promoter throughout in an amount of from about 0.1 wt. % to about 5.0 wt. %; and
wherein the first layer and the second layer are not surface treated with any adhesion promoter at an interface between the first layer and second layer.
10 . The golf ball of claim 9 , wherein the at least one silane-containing adhesion promoter is selected from the group consisting of organosilanes and organosiloxanes.
11 . The golf ball of claim 9 , wherein the second layer is surrounded by a third layer comprising a polyurethane composition, wherein the second layer and the third layer are not surface treated with any adhesion promoter at an interface between the second layer and the third layer.
12 . The golf ball of claim 11 , wherein the polyurethane composition is thermosetting.
13 . The golf ball of claim 11 , wherein the polyurethane composition is thermoplastic.
14 . A golf ball comprising a first layer that consists of a thermoset rubber composition and is surrounded by and adjacent to a second layer consisting of a different thermoset rubber composition;
wherein only one of the thermoset rubber composition of the first layer and the thermoset rubber composition of the first layer comprises at least one silane-containing adhesion promoter throughout in an amount of from about 0.1 wt. % to about 5.0 wt. %; and
wherein the first layer and the second layer are not surface treated with any adhesion promoter at an interface between the first layer and second layer.
15 . The golf ball of claim 14 , wherein the at least one silane-containing adhesion promoter is selected from the group consisting of organosilanes and organosiloxanes.
16 . The golf ball of claim 14 , wherein the second layer is surrounded by and adjacent to a third layer comprising an ionomer composition and wherein the third layer is surrounded by a fourth layer comprising thermoset polyurethane composition, wherein the fourth layer further comprises at least one silane-containing adhesion promoter throughout and in an amount of from about 0.1 wt. % to about 5.0 wt. %; and wherein the third layer and the fourth layer are not surface treated with any adhesion promoter at an interface between the second layer and the third layer.