Fire-retardant particle board and binder therefor from aminoplast with ammonium polyphosphate-formaldehyde product
AssigneeMonsanto Company
InventorGordon E. Brown
Life of this patent
Estimating the term…
Abstract
Novel stable-in-use aminoplast resin binder solutions comprising aqueous solutions of predominantly a urea-formaldehyde resin having a formaldehyde to urea ratio of less than 2.0, from about 40 to 56% by weight dissolved ammonium polyphosphate reacted with 5 to 12.5 percent by weight formaldehyde and not more than 30% by weight water. Preferred aminoplast resin binder solutions also contain a methylolated melamine-formaldehyde resin. A novel process for the production of the stable aminoplast resin binder solutions containing high percentages of ammonium polyphosphates and suitable for production of fire-retardant particle board is disclosed.
Claims15
A fire retardant aminoplast binder resin solution containing not more than 30 percent by weight water consisting of
- A. a substantially neutral aqueous solution of a low molecular weight urea-formaldehyde resin of a mol ratio of from about 3.0 to 3.5 formaldehyde to urea, a viscosity of from about 60 to 100 cps and a percent solids of at least 70 percent,
- B. sufficient urea to reduce the formaldehyde to urea ratio to from about 1.2 to 2.0, and
- C. a stable concentrated aqueous solution having a percent solids of at least 55 percent of ammonium polyphosphate reacted with from 5 to 12.5 percent by weight formaldehyde adjusted to a pH of from 4.7 to 6.2 to produce a concentration of dissolved ammonium polyphosphate of from about 40 to 56 percent by weight in said binder resin solution.
A fire-retardant aminoplast binder resin solution containing not more than 30 percent by weight water consisting of
- A. a substantially neutral aqueous solution of a low molecular weight urea-formaldehyde resin of a mol ratio of from about 3.0 to 3.5 formaldehyde to urea, a viscosity of from about 60 to 100 cps and a percent solids of at least 70 percent,
- B. sufficient urea to reduce the formaldehyde to urea ratio to from about 1.2 to 2.0,
- C. a stable concentrated aqueous solution having a percent solids of at least 55 percent of ammonium polyphosphate reacted with from 5 to 12.5 percent by weight formaldehyde adjusted to a pH of from 4.7 to 6.2 to produce a concentration of dissolved ammonium polyphosphate of from about 40 to 56 percent by weight in said binder resin solution and
- D. from 15 to 25 percent by weight based on the urea-formaldehyde resin of a methylolated melamine-formaldehyde resin.
A process for production of a fire-retardant aminoplast binder resin solution containing not more than 30 percent by weight water which comprises
- A. mixing with a substantially neutral aqueous solution of a low molecular weight urea-formaldehyde resin of a mol ratio of from about 3.0 to 3.5 formaldehyde to urea, a viscosity of from about 60 to 100 cps and a percent solids of at least 70 percent,
- B. sufficient urea to reduce the formaldehyde to urea ratio to from about 1.2 to 2.0, and
- C. a stable concentrated aqueous solution having a percent solids of at least 55 percent of ammonium polyphosphate reacted with from 5 to 12.5 percent by weight formaldehyde adjusted to a pH of from 4.7 to 6.2 to produce a concentration of dissolved ammonium polyphosphate of from about 40 to 56 percent by weight in said binder resin solution.
Dependencies are inferred from the claim text.