Patent ID: 11945927
Assignee: SEIKO PMC CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC C | IPC C

Claim 2:
3. A production method of a foam, comprising:
preparing a masterbatch containing:
a micronized modified cellulose fiber (A) in which a cellulose fiber is covalently bonded with a diene-based polymer (a),
a first thermoplastic resin (B) having a glass transition point of −130° C. to 120° C., and
an unreacted diene-based polymer (C) having a functional group capable of covalently bonding with the cellulose fiber;

diluting the masterbatch with a second thermoplastic resin;
adding a foaming agent and, as necessary, a crosslinking agent after diluting the masterbatch with the second thermoplastic resin; and
performing foam molding or crosslinking foam molding after adding the foaming agent and, as necessary, the crosslinking agent.