Patent ID: 11969984
Assignee: TORAY INDUSTRIES, INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A sandwich laminate comprising:
as a layer forming a core, a sheet-form intermediate substrate obtained by impregnating a mat composed of discontinuous reinforcement fibers having an average fiber length of 1 to 25 mm with a thermoplastic resin (B); and
as layers forming a skin, sheet-form intermediate substrates each obtained by impregnating continuous reinforcement fiber(s) having a length of 100 mm or more with a thermoplastic resin (A),
wherein
at least said sheet-form intermediate substrate has a thermal expansibility,
the usable temperature region of said thermoplastic resin (A) constituting said layers forming a skin and that of said thermoplastic resin (B) constituting said layer forming a core overlap each other over a temperature range of at least 5° C.,
said thermoplastic resin (A) has a temperature region that does not melt at a lower limit of said usable temperature region of said thermoplastic resin (B),
said reinforcement fibers contained in said mat penetrate through interface layers formed by said thermoplastic resin (A) constituting said layers forming a skin and said thermoplastic resin (B) constituting said layer forming a core, and
said thermoplastic resin (A) constituting said layers forming a skin and said thermoplastic resin (B) constituting said layer forming a core form interface layers each with a concave-convex shape having a maximum height Ry of not less than 50 μm and an average roughness Rz of not less than 30 μm.