A bowling ball having at least an outer portion fabricated from the reaction of reactants comprising (i) a polyisocyanate, (ii) an active hydrogen-containing compound having an average functionality of at least 2.0, and (iii) a slip agent compound containing a moiety which imparts lubricity to said ball, said slip agent compound also having at least one active hydrogen-containing group which is reactive with isocyanate groups, said slip agent compound being present in an amount between about 0.5 and about 5 weight percent based on the weight of (i) and (ii), the ratio of (i) to the total of (ii) plus (iii) being such that the reaction is conducted at an isocyanate index between about 0.90 and about 1.30.
A polyurethane resin is composed of a polyol component, a polyisocyanate component and optionally, a chain extender component. At least a portion of the polyol component or chain extender component is a siloxane polyol component represented by the following formula (1) and/or formula (2): ##STR1## wherein R means an alkyl group, R' denotes a hydrogen atom or C.sub.1-5 alkyl group, k, l and m stand for 1-250, 0-5 and 0-50 respectively, and n is an integer of 1-3 in the formula (1) and an integer of 2-3 in the formula (2). A thermal recording material containing the polyurethane resin as a heat-resistant layer is also disclosed.
A track ball device includes a body, and a track ball mounted on said body and having an outer hollow sphere and an inner ball fitted in said outer hollow sphere. A method for manufacturing such a track ball includes the steps of a) providing an inner ball, b) providing a global mold, c) positioning the inner ball at a central portion of the global mold, and d) injecting a material into the global mold for encapsulating therein the inner ball to finally result in the track ball. Such a track ball not only avoids the conventional joint seam because the outer sphere is integrally formed, but also greatly reduces the weight because the inner ball is made of a polyurethane (PU) foam material.
The invention relates to a method for forming golf equipment, or a portion thereof, preferably for forming one or more layers of a golf ball, including: providing a first reactable component containing an isocyanate-containing compound, and a second reactable component containing at least one polyol, polyamine, or epoxy-containing compound; mixing the reactable components together to form a reactive mixture; and injecting the reactive mixture into a cavity or mold having a desired shape within a time sufficient to avoid substantial polymerization, gelation, or solidification. Alternately, instead of providing an isocyanate-containing reactable component and at least one polyol, polyamine, or epoxy-containing compound, the method may include providing at least two sets of precursor components that can be reacted to form at least two different polymers of an interpenetrating polymer network, at least one polymer being crosslinked, wherein, if any of the at least two component sets include a mixture of precursor components, then that mixture must be sufficiently non-reactive such that the sets of precursor components, when placed in contact with each other, can still form an interpenetrating polymer network.
A reaction injection molding process and compositions for forming golf equipment or components thereof that involves providing at least two reactable components that have a fast reaction time and injecting them with sufficient speed after they are mixed so that they are polymerized, solidified, or gelled in a mold cavity.
