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US 5,301,940 AGranted
Baseball bat and production thereof
AssigneesMizuno Corporation, Takeda Chemical Industries, Ltd.
InventorsTakao Seki, Yasuo Sano
Life of this patent
Estimating the term…
Abstract
A baseball bat having a fiber reinforced outer layer which is formed by a resin injection technique employing a continuous reinforcing fiber and a molding material which cures to provide a crosslinked polyaminoamide resin, a crosslinked epoxy-modified polyaminoamide resin or a crosslinked polyesteramide resin and method for manufacturing such baseball bat.
Claims9
A hollow baseball bat having a fiber reinforced outer layer which is formed by steps comprising:
- preparing a core roughly in the form of a bat;
- winding continuous reinforcing fibers in layers around the core to provide a preformed material wherein at least one of the layers is composed of a triaxial braid and wherein the fibers are used in an amount of 30-65% by weight based on the resultant bat;
- placing the preformed material in a mold cavity;
- while evacuating the mold cavity, injecting thereinto a molding material which contains 2,2'-(1,3-phenylene)-bis-2-oxazoline and at least one polyfunctional compound selected from the group consisting of an aromatic diamine compound, a dibasic carboxylic acid and polyfunctional epoxy compound together with a catalyst and has a viscosity of not more than 100 centipoises when being injected thereby to impregnate the reinforcing fibers therewith;
- curing the molding material in the mold cavity under heating and pressure to form a molded material composed of a fiber reinforced crosslinked resin;
- and
- removing the core from the molded material.
4 more elements
A method of manufacturing a hollow baseball bat having a fiber reinforced outer layer, which comprises:
- preparing a core roughly in the form of a bat;
- winding continuous reinforcing fibers in layers around the core to provide a preformed material wherein at least one of the layers is composed of a triaxial braid and wherein the fibers are used in an amount of 30-65% by weight based on the resultant bat;
- placing the preformed material in a mold cavity;
- while evacuating the mold cavity, injecting thereinto a molding material which contains 2,2'-(1,3-phenylene)-bis-2-oxazoline and at least one polyfunctional compound selected from the group consisting of an aromatic diamine compound, a dibasic carboxylic acid and polyfunctional epoxy compound together with a catalyst and has a viscosity of not more than 100 centipoises when being injected thereby to impregnate the reinforcing fibers therewith;
- curing the molding material in the mold cavity under heating and pressure to form a molded material composed of a fiber reinforced crosslinked resin;
- and
- removing the core from the molded material.
4 more elements
Dependencies are inferred from the claim text.