Production process for laminated materials based on wood veneer

• US 20030108760A1
• Filed: 12/06/2002
• Published: 06/12/2003
• Est. Priority Date: 12/10/2001
• Status: Abandoned Application

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Haas, Peter, Hoppe, Ernst-Martin, Pielasch, Andreas, Larimer, Donald-Richard
• Application Number:
  US10/313,610
• Publication Number:
  US 20030108760A1
• Time in Patent Office: Days
• US Class Current: 428/537.1
• CPC Class Codes: B27D 1/00 Joining wood veneer with any material; Forming articles thereby in conjunction with moulding of wood particles or fibres B27N3/06; Preparatory processing of surfaces to be joined, e.g. scoring
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/4837 and other oxyalkylene units
• CPC Class Codes: Y10T 428/31989 Of wood

Abstract

Multi-ply laminated materials based on wood veneer are produced by pressing veneer woods glued with a specified binder which enhances the cold bond strength of the laminate.

Claims

1. A process for the production of a laminated material based on wood veneer comprising pressing veneers glued with a binder, optionally in combination with paper, cellulose or a woven web, in which the binder comprises a prepolymer having urethane groups and an NCO content of from 20 to 31 wt. %, which is the reaction product of a polyisocyanate of the diphenylmethane diisocyanate series with a hydroxy-functional polyether having an EO content of more than 60 wt. %, in relation to total quantity of alkylene oxide used to produce the polyether.

2. The process of claim 1 in which polymeric diphenylmethane diisocyanate having a monomeric diphenylmethane diisocyanate content of less than 55 wt. % is used as the polyisocyanate.

3. The process of claim 1 in which water is sprayed onto the veneer which is glued with binder.

4. The process of claim 1 in which the binder includes zeolite.

5. A laminated material based on wood veneer produced by the process of claim 1.