Polymer cover layer for golf club face
View Patent ↗A golf club head, comprising a striking surface having an outer cover layer comprising a polyurethane or polyurea having a material Shore D hardness of 40 to 70, a layer thickness of 0.2 to 0.6 mm, and a flexural modulus of 5 to 110 kpsi.
1. A golf club head, comprising a striking surface having an outer cover layer comprising a polyurethane or polyurea having a material Shore D hardness of 40 to 70, a layer thickness of 0.2 to 0.6 mm, and a flexural modulus of 5 to 110 kpsi and wherein the outer cover layer has a surface roughness Ra of 0.5 to 5 μm and an abrasion resistance of less than 0.8 g/8 min.
2. The golf club head of claim 1 , wherein the abrasion resistance is less than 0.4 g/8 min.
3. A golf club head, comprising a striking surface having an outer cover layer comprising a polyurethane or polyurea having a layer thickness of 0.2 to 0.6 mm, and a flexural modulus of 2 to 70 kpsi, wherein the polyurethane or polyurea is a reaction product of a polyurethane prepolymer or polyurea prepolymer that has 3 to 10 mol % free NCO groups with a curative and wherein the outer cover layer has a surface roughness Ra of 0.5 to 5 μm and an abrasion resistance of less than 0.8 g/8 min.
4. A golf club head, comprising a striking surface having an outer cover layer comprising a polyurethane or polyurea having a layer thickness of 0.2 to 0.6 mm, and a flexural modulus of greater than 70 to 120 kpsi, wherein the polyurethane or polyurea is a reaction product of a polyurethane prepolymer or polyurea prepolymer that has 5 to 20 mol % free NCO groups with a curative and wherein the outer cover layer has a surface roughness Ra of 0.5 to 5 μm and an abrasion resistance of less than 0.8 g/8 min.
5. A golf club head, comprising a striking surface having an outer cover layer comprising a polyurethane or polyurea having a material Shore D hardness of 40 to 70, a layer thickness of 0.2 to 0.6 mm, and a flexural modulus of 5 to 110 kpsi and wherein the outer cover layer has a surface roughness Ra of 3 to 10 μm and an abrasion resistance of less than 0.6 g/8 min.
6. The golf club head of claim 5 , wherein the abrasion resistance is less than 0.4 g/8 min.