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US 2013/0280468 A1Published application
Method for producing skin-covered foamed molded article and resulting product
AssigneeJsp Corporation
InventorsMasahiro GOMIBUCHI, Tomoo Tokiwa
Life of this patent
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Abstract
A method for producing a skin-covered foamed molded article includes blow molding a parison into a skin and heating expanded polystyrene beads filled in a hollow space of the skin to form a foam layer fuse-bonded to the skin, polystyrene resin composition having specific Charpy impact strength, MFR and branching degree. The skin of the skin-covered foamed molded article is formed of the specific polystyrene resin composition.
Claims14
A method for producing a skin-covered foamed molded article, comprising the steps of:
- (a) forming a parison in a molten or softened state;
- (b) blow molding the parison into a skin defining a hollow interior space;
- (c) filling expanded polystyrene beads in the hollow interior space;
- and
- (d) heating the expanded polystyrene beads filled in the hollow interior space to fuse-bond the expanded polystyrene beads to each other and to form a foam layer fuse-bonded to the skin,
- wherein the parison is formed of a polystyrene resin composition that meets the following requirements (1) to (3):
- (1) the polystyrene resin composition has a Charpy impact strength at 23° C. according to IS0179/1eA of at least 5 kJ/m2;
- (2) the polystyrene resin composition has a melt mass flow rate at a temperature of 200° C. and a load of 5 kg of 1.5 to 3.0 g/10 min;
- (3) the polystyrene resin composition has a ratio MwS(abs)/MwS(r) of at least 1.4 where MwS(abs) and MwS(r) represent a weight average absolute molecular weight and a linear polystyrene equivalent weight average molecular weight, respectively, of the polystyrene resin composition.
6 more elements
A skin-covered foamed molded article, comprising:
- a skin having an interior surface defining a hollow interior space;
- and
- a foam layer of expanded polystyrene beads which are fuse-bonded to each other, said foam-layer being provided within the hollow interior space and fuse-bonded to the interior surface,
- wherein the skin is formed of a polystyrene resin composition that meets the following requirements (1) to (3):
- (1) the polystyrene resin composition has a Charpy impact strength at 23° C. according to IS0179/1eA of at least 5 kJ/m2;
- (2) the polystyrene resin composition has a melt mass flow rate at a temperature of 200° C. and a load of 5 kg of 1.5 to 3.0 g/10 min;
- (3) the polystyrene resin composition has a ratio MwS(abs)/MwS(r) of at least 1.4 where MwS(abs) and MwS(r) represent a weight average absolute molecular weight and a linear polystyrene equivalent weight average molecular weight, respectively, of the polystyrene resin composition.
4 more elements
Dependencies are inferred from the claim text.