Interpenetrating polymer networks using blocked polyurethane/polyurea prepolymers for golf ball layers
View Patent ↗The present invention is directed to a method of forming a golf ball that contains an interpenetrating polymer network, or IPN, which includes at least two polymeric systems, in one or more of the layers. The first polymeric system may include a polyurethane-based or polyurea-based system having blocked isocyanate groups and the second polymeric system may include an epoxy-based or acrylic-based system, wherein the two systems are polymerized or cured simultaneously or sequentially to form an IPN.
1. A golf ball comprising a core and a cover, wherein a portion of the golf ball is formed from an interpenetrating polymer network comprising:
a first polymeric system comprising a saturated isocyanate having terminal isocyanate groups, an amine-terminated component, and a blocked, delayed action curative; and
a second polymeric system comprising an acrylate resin and an initiator.
2. The golf ball of claim 1 , wherein the first polymeric system further comprises a catalyst comprising an organometallic compound, tertiary amine, or combination thereof.
3. The golf ball of claim 1 , wherein the blocked delayed action curative comprises methylene dianiline and sodium chloride.
4. The golf ball of claim 1 , wherein the initiator comprises benzoyl peroxide, t-amyl peroxide, or mixtures thereof.
5. The golf ball of claim 1 , further comprising an intermediate layer.
6. The golf ball of claim 5 , wherein the portion comprises the cover.
7. The golf ball of claim 1 , wherein the blocked, delayed action curative has a deblocking temperature of about 175° F. to about 350° F.
8. A golf ball comprising a core and a cover, wherein the cover comprises an interpenetrating polymer network comprising:
a first polymeric system comprising a saturated isocyanate having terminal isocyanate groups, an amine-terminated component, and a curing agent, wherein the curing agent comprises methylene dianiline and sodium chloride; and
a second polymeric system comprising an acrylate resin and an initiator, wherein the first and second polymeric systems are not bonded to each other.
9. The golf ball of claim 8 , wherein the initiator comprises benzoyl peroxide, t-amyl peroxide, or mixtures thereof.