Core resin
AssigneeSekisui Chemical Co., Ltd.
InventorTakahisa CHITOU
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Abstract
Provided is a resin for core used for injection molding, with which an inner surface of an outer molded body is less likely to be roughened, and an inner surface of a finally obtained molded body is smooth and less likely to have chipping. The resin for core includes a polyvinyl alcohol-based resin, used for an application in which a core is dissolved in water after an outer molded body is molded in an injection molding process, and includes an easy stripping agent that enhances easy stripping properties when the resin for core dissolves in a proportion of more than 0.1 wt % and less than 1.2 wt %.
Claims12
A water-soluble core for injection molding comprising a resin, the resin comprising:
- a polyvinyl alcohol-based resin,
- a glycerin fatty acid ester-based compound as an easy stripping agent, and
- at least one plasticizer selected from the group including ethylene glycol, diglycerin, and trimethylolpropane,
- wherein the resin has a polymerization degree of 800 or less,
- wherein the resin contains the glycerin fatty acid ester-based compound in a proportion of more than 0.1 wt % and less than 1.2 wt %, and
- wherein a total proportion of all plasticizers in the resin is 6.0 wt % or less.
Dependencies are inferred from the claim text.