DE63160T1 - THERMOPLASTIC HARDBOARD MADE OF ACETYLATED WOOD FIBER MAT. - Google Patents

Claims (1)

PATENT CLAIMS 10 Process for the preparation of an acetylated wood fiber felt, consisting of the steps of coating a substantially dry wood fiber felt with acetic anhydride in a weight proportion of approx. 35% to approx. 120%, insertion of the coated fiber felt in a sealed space, heating the enclosed fiber felt to a temperature of approx. 65 ° C (150 ° F) to approx. 149 ° C (300 ° F) over a period of approx. 20 minutes to approx. 120 minutes and discharge of the by-product acetic acid and the remaining anhydride. 15th The method of claim 1 wherein the amount of acetic anhydride approx. 60% to approx. 80% of the dry weight of the felt. 20th A method according to claim 1 or claim 2, wherein the Temperate amounts to. Temperature approx. 107 ° C (225 ° F) to approx. 135 ° C (275 ° F) A method according to claim 1 or 2, wherein the fiber felt is heated over a period of about 30 minutes to about 90 minutes. 25th A method according to claim 3, wherein the fiber felt has a ·!.,; Is heated for a period of about 60 minutes to about 90 minutes; 6. Process for the preparation of a thermoplastic hardboard, consisting of the steps of coating an essentially dry wood fiber felt with acetic anhydride in a weight proportion of approx. 35% to approx. 120%, inserting the coated fiber felt in a sealed room, heating the enclosed fiber felt to a temperature of about 65 ° C (15O ⁰ F) to about 149 ° C (30O ⁰ F) over a period of about 20 minutes to approximately 120 minutes, drying the acetylated fiber felt, and compressing this fiber felt at a temperature from approx. 2O4 ° C (400 ° F) to approx. 26O ° C (500 ° F). 7. The method of claim 6 wherein the fiber felt has a density in the range of about 4 870 N / m (31 lb / cu ft) to is compressed approximately 12569 N / m "(80 lb / cu ft). 8. The method of claim 6 wherein the amount of acetic anhydride a weight fraction of the fiber felt from approx. 60% to approx. 80% and the included Fiber felt is heated to about 121 ° C (250 ° F) over a period of about 60 minutes to about 90 minutes. 9. Fibreboard felt for pressing together to form a thermoplastic hardboard by an acetylation process, consisting of the steps of coating a substantially dry wood fiber felt with
Acetic anhydride in a weight fraction of about 20% to about 70%, placing the coated fiber felt in a sealed space, heating the enclosed fiber felt to a temperature of about 65 C (150 ° F) to about 14 9 ° C (300 ° F) over a period of about 20 minutes to about 120 minutes and removing the by-product acetic acid and the remaining anhydride. 10. Thermoplastic hardboard, which is made from an acetylated Wood fiber felt is shaped. 11. Thermoplastic hardboard, which when bent in sharply curved shapes have a high resistance to splitting, this hardboard being a compressed Is wood fiber felt that has been acetylated. 12. Hard fiber board according to claim 11, characterized by an acetyl content of about 12% to about 18%. 13. A curved article of manufacture formed by bending the thermoplastic fiber board according to claim 10 at einj Temperature from approx. 2O4 ° C (4OO ° F) to approx. 26O ° C (500 ° F) is made. 14. Cylindrical article of manufacture, consisting of a thermoplastic hardboard made from an acetylated Wood fiber felt is pressed.