Abstract: A fluid composition which generates a partially gelled polymer matrix and a method for its preparation in situ. The reactants that form the novel fluid are held in separate vessels. When desired, the reactants are introduced into a mixing chamber for reaction to form the partially gelled novel fluid. The partially gelled novel fluid has the particular properties that hold fillers and additives for secondary reactions to occur in the same vessel. This composition and method of preparation have particular application to items that utilize a combination of reactive polymers, which include polyurethanes, epoxies, and polyesters, such as bowling balls, and other molded polymer parts such as those used in automotive, marine, sporting goods, appliances, and toys.

Abstract: A fluid composition which generates a partially gelled polymer matrix and a method for its preparation in situ. The reactants that form the novel fluid are held in separate vessels. When desired, the reactants are introduced into a mixing chamber for reaction to form the partially gelled novel fluid. The partially gelled novel fluid has the particular properties that hold fillers and additives for secondary reactions to occur in the same vessel. This composition and method of preparation have particular application to items that utilize a combination of reactive polymers, which include polyurethanes, epoxies, and polyesters, such as bowling balls, and other molded polymer parts such as those used in automotive, marine, sporting goods, appliances, and toys.

Abstract: A bowling ball having thumb and finger holes for gripping said ball, said ball having a geometric center and when thrown consistently having a ball track plane and a spin axis, said spin axis being perpendicular to said ball track plane, said ball comprising:a first weighting means located within said ball along said spin axis on a positive side of said ball, said first weighting means having a weight of W.sub.1 and being located a distance D.sub.1 from said geometric center; and, a second weighting means located within said ball along said spin axis, said second weighting means having a weight W.sub.2 and being located a distance D.sub.2 from said geometric center, W.sub.1 being greater than W.sub.2, D.sub.1 being less than D.sub.2, said first and second weighting means being on opposite sides of said geometric center along said spin axis, said first and second weighting means placed along said spin axis so that W.sub.1 D.sub.1 =W.sub.2 D.sub.2.

Abstract: A bowling ball comprises a core, a cover surrounding the core, and a weighting rod for increasing the weight density of the bowling ball along the spin axis, thereby reducing the bowling balls moment of inertia about the spin axis. To modify the trajectory of the ball's hook, or arc, on the bowling alley lane, the rod's weight may be offset so that one side of the bowling ball is heavier than the other side. The biased nature of the weight causes the bowling ball to develop precession, and improve the hooking nature of the trajectory.

Abstract: A bowling ball construction in which in the preferred embodiment a pair of weight blocks are provided internally in the ball to compensate for weight removed from the ball in drilling finger and thumb holes. The weight blocks are positioned so as to be intersected by the finger and thumb holes when drilled. As a result, there is no concentrated residual weight in the ball after drilling. The size of the weight blocks and the density thereof are selected so that after drilling, any axis of the ball may be spin axis with moments of inertia about principal axes being approximately equal and products of inertia about axes perpendicular to the spin axis being vanishingly small. Thus, the ball exhibits stability without wobble as it slides and rolls down a lane.