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US 12,766,819 B2Granted
Co-extruded sheet and resin-molded product
AssigneeMaxell, Ltd.
InventorsToshiharu Goto, Satoshi Yamamoto, Kei Mizutani
Life of this patent
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Abstract
A co-extruded sheet contains a polycarbonate resin, and includes a core layer formed from a foam resin, a skin layer formed from a non-foaming resin and laminated to one major surface of the core layer, and a second skin layer laminated to another major surface of the core layer. A melt volume-flow rate of the polycarbonate resin contained in the core layer (MVRc) and a melt volume-flow rate of the polycarbonate resin contained in one of the skin layers (MVRs) satisfy the following expression, (1): 1.5 ≤ MVRs / MVRc ≤ 8. . ( 1 )
Claims9
A co-extruded sheet containing a polycarbonate resin, comprising:
- a core layer formed from a foam resin;
- a first skin layer formed from a non-foaming resin and laminated to one major surface of the core layer;
- and
- a second skin layer laminated to another major surface of the core layer,
- wherein a melt volume-flow rate of a polycarbonate resin contained in the core layer (hereinafter referred to as MVRc) and a melt volume-flow rate of a polycarbonate resin contained in one of the first and second skin layers (hereinafter referred to as MVRs) satisfy the following expression;
- (1):
- 1.5
- ≤
- MVRs
- /
- MVRc
- ≤
- 8.
- ,
- and
- (
- 1
- )
- wherein the MVRs and the MVRc are measured by measuring the resin materials contained in the first skin layer, the second skin layer and the core layer at a measurement temperature of 300° C. and a load of 1.2 kg.
16 more elements
Dependencies are inferred from the claim text.