# US 10,308,848 B2 · Plywood article

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- Number: US 10,308,848 B2
- Document ID: US10308848B2
- Status: Granted
- Kind: B2
- Application number: 15/746,636
- Filed: 2016-07-20
- Published: 2018-08-02
- Granted: 2019-06-04
- Earliest claimed: 2015-07-23
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Michael T. Yang; Johnathan Fay; Timothy Shrewsburg
- Web page: https://patentgrep.com/patent/US10308848B2

## CPC

- C09J 175/04: Polyurethanes
- B27D 1/06: Manufacture of central layers; Form of central layers {(see also B27M3/002 and B27M3/0026)}
- B32B 7/03: with respect to the orientation of features (direction of fibres or filaments B32B5/12)
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 21/042: {of wood (B32B21/13 takes precedence)}
- B32B 21/13: all layers being exclusively wood
- B32B 21/14: comprising wood board or veneer
- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J 11/04: inorganic
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/04: 4 layers
- B32B 2250/05: 5 or more layers
- B32B 2250/42: Alternating layers, e.g. ABAB(C), AABBAABB(C)
- B32B 2255/08: on wood layer
- B32B 2255/26: Polymeric coating
- B32B 2264/102: Oxide or hydroxide
- B32B 2307/542: Shear strength
- B32B 2307/558: Impact strength, toughness
- B32B 2419/00: Buildings or parts thereof
- B32B 2605/18: Aircraft
- B32B 2607/00: Walls, panels
- C09J 2400/10: Presence of inorganic materials
- C09J 2475/00: Presence of polyurethane
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B27D: WORKING VENEER OR PLYWOOD (applying liquids or other fluent materials to surface in general B05; grinding, sanding, or polishing of wood B24; applying adhesives or glue to surfaces of wood B27G11/00; manufacture of veneer B27L5/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

This disclosure provides a plywood article that is pre-cured or cured. The plywood includes a first wood veneer, a second wood veneer disposed opposite the first wood veneer and an adhesive composition disposed between the first wood veneer and the second wood veneer. The adhesive composition is either cured or not cured. Prior to cure, the adhesive composition consists essentially of an isocyanate component and Kaolin. After cure, the cured adhesive composition consists essentially of a self-polymerization product of the isocyanate component and the Kaolin. The Kaolin is present in an amount of from greater than 10 to 50 weight percent based on a total weight of the adhesive composition. Moreover, each of the first and second wood veneers independently has a moisture content of from 0 to 45 weight percent.

## Claims

### Claim 1

A pre-cured plywood article comprising:
A. a first wood veneer;
B. a second wood veneer disposed opposite said first wood veneer; and
C. an adhesive composition disposed between said first and second wood veneers; wherein said adhesive composition consists essentially of;
(1) an isocyanate component; and
(2) Kaolin present in an amount of from greater than 10 to 50 weight percent based on a total weight of said adhesive composition; and
wherein each of said first and second wood veneers independently has a moisture content of from 5 to 45 weight percent.

### Claim 2 (depends on 1)

The pre-cured plywood article of claim 1 wherein said isocyanate component is polymeric methylene-4,4′-diphenyl diisocyanate (pMDI).

### Claim 3 (depends on 1)

The pre-cured plywood article of claim 1 wherein said Kaolin is present in an amount of from greater than 20 to 40 weight percent based on a total weight of said adhesive composition.

### Claim 4 (depends on 1)

The pre-cured plywood article of claim 1 wherein said Kaolin is present in an amount of from 30 to 40 weight percent based on a total weight of said adhesive composition.

### Claim 5 (depends on 1)

The pre-cured plywood article of claim 1 wherein said adhesive composition is free of a diluent.

### Claim 6 (depends on 1)

The pre-cured plywood article of claim 1 wherein said adhesive composition consists essentially of said isocyanate component, said Kaolin, and a diluent.

### Claim 7 (depends on 6)

The pre-cured plywood article of claim 6 wherein said diluent is triethyl phosphate.

### Claim 8 (depends on 6)

The pre-cured plywood article of claim 6 wherein said diluent is an organic solvent.

### Claim 9 (depends on 1)

The pre-cured plywood article of claim 1 further comprising one or more additional wood veneers each independently overlaying an adjoining wood veneer and an additional adhesive composition disposed between each pair of additional wood veneers, and wherein said additional adhesive composition consists essentially of an additional isocyanate component and Kaolin present in an amount of from greater than 10 to 50 weight percent based on a total weight of said additional adhesive composition.

### Claim 10 (depends on 1)

The pre-cured plywood article of claim 1 wherein each of said wood veneers independently has a moisture content of from 10 to 30 weight percent.

### Claim 11 (depends on 1)

The pre-cured plywood article of claim 1 wherein said adhesive composition has a viscosity, as measured by rheometer at a nominal shear rate of 100 s″1, from 0.4 to 1.2 Pas.

### Claim 12 (depends on 1)

A method of forming the pre-cured plywood article of claim 1, wherein said method comprises the steps of:
providing the first and second wood veneers;
disposing the adhesive composition on the first wood veneer; and
overlaying the second wood veneer onto the first wood veneer such that the second wood veneer comes into direct contact with the adhesive composition disposed on the first wood veneer and the adhesive composition is disposed between the first and second wood veneers to form the pre-cured plywood article.

### Claim 13

A cured plywood article comprising:
A. a first wood veneer;
B. a second wood veneer disposed opposite said first wood veneer; and
C. a cured adhesive composition disposed between said first and second wood veneers;
wherein said cured adhesive composition consists essentially of;
(1) a self-polymerization product of an isocyanate component; and
(2) Kaolin present in an amount of from greater than 10 to 50 weight percent based on a total weight of said cured adhesive composition; and
wherein each of said first and second wood veneers independently has a moisture content of from 5 to 45 weight.

### Claim 14 (depends on 13)

The cured plywood article of claim 13 wherein said isocyanate component is polymeric methylene-4,4′-diphenyl diisocyanate (pMDI).

### Claim 15 (depends on 13)

The cured plywood article of claim 13 wherein said Kaolin is present in an amount of from 30 to 40 weight percent based on a total weight of said cured adhesive composition.

### Claim 16 (depends on 13)

The cured plywood article of claim 13 wherein said adhesive composition consists essentially of said isocyanate component, said Kaolin, and a diluent.

### Claim 17 (depends on 16)

The cured plywood article of claim 16 wherein said diluent is tri ethyl phosphate.

### Claim 18 (depends on 13)

The cured plywood article of claim 13 further comprising one or more additional wood veneers each independently overlaying an adjoining wood veneer and an additional adhesive composition disposed between each pair of additional wood veneers, and wherein said additional adhesive composition consists essentially of an additional isocyanate component and Kaolin present in an amount of from greater than 10 to 50 weight percent based on a total weight of said additional adhesive composition.

### Claim 19 (depends on 13)

The cured plywood article of claim 13 which exhibits 50 to 85% wood retention.

### Claim 20 (depends on 13)

A The method of forming the cured plywood article claim 13 wherein said method comprises the steps of:
providing the first wood veneer;
disposing the adhesive composition on the first wood veneer wherein the adhesive composition consists essentially of the isocyanate component and the Kaolin;
overlaying the second wood veneer onto the first wood veneer such that the second wood veneer comes into direct contact with the adhesive composition disposed on the first wood veneer and the adhesive composition is disposed between the first and second wood veneers to form the pre-cured plywood article; and
compressing and heating the pre-cured plywood article such that the isocyanate component reacts with moisture present in the first and second wood veneers to form the self-polymerization product, the cured adhesive composition, and the cured plywood article.