Cellulose gypsum based substrate with increased water...

Details Cellulose gypsum based substrate with increased water... Cellulose gypsum based substrate with increased water...

2007-12-18

2007-12-18

Bashore, Alain L. (Department: 1762)

Coating processes

Spraying

C427S424000, C427S427400, C427S427700, C427S385500, C427S393600, C015S257060

Reexamination Certificate

active

10978572

ABSTRACT:
The disclosed invention consists of an improved gypsum based, cellulosic containing board and method for applying a resin to an untreated board at a spray station where pMDI resin is sprayed onto the front and back side of the board. A resin distribution system is used to supply the spray nozzles with pMDI. Optionally, a second spray station is included, if desired, to add additional pMDI resin over the surface of the board to achieve complete coverage. The improvement is an increased water resistance and flexural strength.

REFERENCES:
patent: 4647496 (1987-03-01), Lehnert et al.
patent: 5115972 (1992-05-01), Maier et al.
patent: 5397631 (1995-03-01), Green et al.
patent: 6217946 (2001-04-01), Bolind et al.
patent: 6376582 (2002-04-01), Iwata et al.
patent: 6703331 (2004-03-01), Bruce et al.

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