US4352696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and composition
Assignee: Dow Chemical Co
•
Filing: 1981-03-30
•
Granted: 1982-10-05
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Expires: 2001-03-30
Abstract
Abstract The use of polyisocyanates as binders in the preparation of particle boards is subject to the drawback that the boards exhibit a tendency to adhere to the face of the platens used in their formation. This problem is minimized by incorporating minor amounts of certain phosphinic and or phosphonic acids or derivatives thereof or phosphites into the polyisocyanate to be used as binder. The polyisocyanates and the phosphorus compounds are applied to the particles separately, or after preblending one with the other. Whether the components are applied separately or in combination one with the other, they can each be applied either neat or in the form of an emulsion or emulsions.
Inventors
- 👤 Richard A. Prather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:01
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; C08K; C08K5/00; C08K5/49; C08K5/51; C08L75/00; C08L2205/00; C08L2205/06; C08L75/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
227 words
In a process for the preparation of particle board wherein particles of material capable of being compacted are contacted with a polyisocyanate composition and the treated particles are subsequently formed into boards by the application of heat and pressure, the improvement which comprises contacting said particles, in addition to the treatment with said polyisocyanate composition, with from about 0.1 to about 20 parts, per 100 parts by weight of said polyisocyanate, of a compound selected from the class consisting of: (a) compounds having the formulae: ##STR7## wherein R is hydrocarbyl; R' is selected from the group consisting of hydrocarbyl, alkoxy, hydroxyl and ##STR8## wherein R" is selected from the group consisting of alkyl and aryl, one of A and B represents hydrogen and the other is selected from the class consisting of hydrogen, methyl, chloromethyl and 2,2,2-trichloroethyl, and n is a number having an average value from 1 to 25; R and R' taken together represent alkylene having 3 to 5 carbon atoms in the chain separating the valencies; X is selected from the group consisting of hydroxy, halo, acyloxy, hydrocarbylamino, and ##STR9## wherein R", A, B, and n are as defined above; and Y represents a member selected from the group consisting of halo and ##STR10## (b) metal, ammonium and organic amine salts of the acids of formula (I) wherein R' and or X represents hydroxyl.
Claim 2
Dependent Claim
227 words
In a process for the preparation of particle board wherein particles of material capable of being compacted are contacted with a polyisocyanate composition and the treated particles are subsequently formed into boards by the application of heat and pressure, the improvement which comprises contacting said particles, in addition to the treatment with said polyisocyanate composition, with from about 0.1 to about 20 parts, per 100 parts by weight of said polyisocyanate, of a compound selected from the class consisting of: (a) compounds having the formulae: ##STR7## wherein R is hydrocarbyl; R' is selected from the group consisting of hydrocarbyl, alkoxy, hydroxyl and ##STR8## wherein R" is selected from the group consisting of alkyl and aryl, one of A and B represents hydrogen and the other is selected from the class consisting of hydrogen, methyl, chloromethyl and 2,2,2-trichloroethyl, and n is a number having an average value from 1 to 25; R and R' taken together represent alkylene having 3 to 5 carbon atoms in the chain separating the valencies; X is selected from the group consisting of hydroxy, halo, acyloxy, hydrocarbylamino, and ##STR9## wherein R", A, B, and n are as defined above; and Y represents a member selected from the group consisting of halo and ##STR10## (b) metal, ammonium and organic amine salts of the acids of formula (I) wherein R' and or X represents hydroxyl.
Claim 3
Dependent Claim
41 words
The process of claim 1 wherein said polyisocyanate is a polymethylene polyphenyl polyisocyanate containing from about 25 to about 90 percent by weight of methylenebis(phenyl isocyanate), the remainder of said mixture being oligomeric polymethylene polyphenyl polyisocyanates of functionality greater than 2.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the polymethylene polyphenyl polyisocyanate contains from about 35 to about 65 percent by weight of methylenebis(phenyl isocyanate).
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said compound (I) comprises O-ethyl ethylphosphonic acid.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said compound (I) comprises heptylphosphonic acid.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said compound (I) comprises O-octyl octylphosphonic acid.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said compound (I) comprises dodecylphosphonic acid.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said compound (I) comprises phenylphosphonic acid.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein said compound (I) comprises phenylphosphinic acid.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein said compound (I) comprises diphenylphosphinic acid.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein said compound (II) is O-butoxyethoxyethyl chlorophosphite.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein said compound (II) is O,O-di(butoxyethoxyethyl)phosphite.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the particles employed in the preparation of said particle board are wood chips.
Claim 15
Dependent Claim
32 words
The process of claim 1 wherein said polyisocyanate and said compound (I) or salt thereof or said compound (II) are applied simultaneously to said particles in the form of an aqueous emulsion.
Claim 16
Dependent Claim
16 words
The process of claim 14 wherein said aqueous emulsion of polyisocyanate also comprises an emulsifying agent.
Claim 17
Dependent Claim
25 words
The process of claim 1 wherein said particles are contacted separately with said polyisocyanate and said compound (I), a salt thereof, or said compound (II).
Claim 18
Dependent Claim
29 words
The process of claim 16 wherein said polyisocyanate and said compound (I), a salt thereof, or said compound (II) are each employed in the form of an aqueous emulsion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |