US4457978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde depressed particle board
Assignee: Individual
•
Filing: 1983-05-16
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Granted: 1984-07-03
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Expires: 2003-05-16
Abstract
Abstract A method and particle board composition which employs urea formaldehyde resin adhesive, but which is formaldehyde suppressed by adding to the formaldehyde resin, a small but suppression effective amount of a weak acid and calcium metal silicate.
Inventors
- 👤 Stanley Wawzonek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:59
CPC Classifications
B; B27; B27N; B27N1/00; B27N1/003; C; C08; C08K; C08K3/00; C08K3/34; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
70 words
A method of preparing formaldehyde suppressed particle board which employs a formaldehyde resin adhesive for bonding the particles of said board, comprising: uniformly coating particles used in making said board with a adhesive mixture which is a formaldehyde resin containing a small but formaldehyde suppressing effective amount of a weak acid which is substantially inert to formaldehyde resins, and calcium metasilicate, and pressing the coated particles into a particle board.
Claim 2
Independent Claim
70 words
A method of preparing formaldehyde suppressed particle board which employs a formaldehyde resin adhesive for bonding the particles of said board, comprising: uniformly coating particles used in making said board with a adhesive mixture which is a formaldehyde resin containing a small but formaldehyde suppressing effective amount of a weak acid which is substantially inert to formaldehyde resins, and calcium metasilicate, and pressing the coated particles into a particle board.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the formaldehyde resin adhesive is a urea formaldehyde resin.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the formaldehyde resin is a phenol formaldehyde resin.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein the weak acid is boric acid.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein the adhesive mixture also contains a small amount of an organic hydroxyl compound containing more than one hydroxyl group per molecule.
Claim 7
Dependent Claim
25 words
The method of claim 5 wherein the organic hydroxyl group containing compound is selected from the group consisting of mannitol, invert sugar, dextrose and glycerol.
Claim 8
Dependent Claim
14 words
The method of claim 6 wherein the organic hydroxyl group containing compound is mannitol.
Claim 9
Dependent Claim
16 words
The method of claim 7 wherein the ratio of boric acid to mannitol is about 2:1.
Claim 10
Dependent Claim
28 words
The method of claim 8 wherein the amount of calcium metasilicate is from about 15 grams per gallon of resin to about l25 grams per gallon of resin.
Claim 11
Dependent Claim
28 words
The method of claim 9 wherein the amount of calcium metasilicate is from about 30 grams per gallon of resin to about 120 grams per gallon of resin.
Claim 12
Dependent Claim
28 words
The method of claim 10 wherein the amount of calcium metasilicate is from about 60 grams per gallon of resin to about 120 grams per gallon of resin.
Claim 13
Dependent Claim
30 words
The method of claim 11 wherein the particle size of said calcium metasilicate is about 2% retained in a 200 mesh standard sieve screen to 400 mesh standard sieve screen.
Claim 14
Dependent Claim
24 words
The method of claim 1 wherein the amount of adhesive mix employed is from about 6% to about 10% by weight of said particles.
Claim 15
Dependent Claim
21 words
The method of claim 13 wherein the amount of said adhesive adhesive mix is about 10% by weight of said particles.
Claim 16
Independent Claim
75 words
A method of preparing formaldehyde suppressed particle board which employs urea formaldehyde resin for bonding the particles of said board, comprising: uniformly coating particles used in making said board with a small but effective amount of an aqueous solution of boric acid; mixing urea formaldehyde resin with a small but suppression effective amount of a calcium metasilicate; uniformly coating said mixed resin on said particles; and pressing said coated particles into a particle board form.
Claim 17
Independent Claim
75 words
A method of preparing formaldehyde suppressed particle board which employs urea formaldehyde resin for bonding the particles of said board, comprising: uniformly coating particles used in making said board with a small but effective amount of an aqueous solution of boric acid; mixing urea formaldehyde resin with a small but suppression effective amount of a calcium metasilicate; uniformly coating said mixed resin on said particles; and pressing said coated particles into a particle board form.
Claim 18
Dependent Claim
24 words
The method of claim 15 wherein said aqueous solution of boric acid contains mannitol, the ratio of boric acid to mannitol being about 2:1.
Claim 19
Dependent Claim
53 words
A urea formaldehyde resin containing particle board of substantially reduced formaldehyde outgassing properties, said board comprising: about 90% of wood chips; about 10% of a urea formaldehyde resin mix; said mixing containing a small but suppression effective amount of calcium metasilicate and a weak acid which is substantially inert to urea formaldehyde resin.
Claim 20
Dependent Claim
53 words
A urea formaldehyde resin containing particle board of substantially reduced formaldehyde outgassing properties, said board comprising: about 90% of wood chips; about 10% of a urea formaldehyde resin mix; said mixing containing a small but suppression effective amount of calcium metasilicate and a weak acid which is substantially inert to urea formaldehyde resin.
Claim 21
Dependent Claim
12 words
The particle board of claim 17 wherein the acid is boric acid.
Claim 22
Dependent Claim
16 words
The particle board of claim 17 wherein said mix also contains a small amount of mannitol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |