Patent US3949149A successfully refreshed from Google Patents.
US3949149A
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US
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Process for the production of wood materials having high resistance to hot water, said materials containing phenol-aldehyde resin and alkylene carbonate hardener
Assignee: Wintershall Dea International AG
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Filing: 1974-12-19
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Granted: 1976-04-06
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Expires: 1994-12-19
Abstract
Abstract Wood materials are prepared, characterised by improved resistance to hot water and by high weather resistance, by combining wood products with a phenol-aldehyde resin and alkylene carbonate hardener, the latter being incorporated in said resin as an aqueous formaldehyde solution.
Inventors
- 👤 Martin Cherubim
- 👤 Karl-Heinz Heinemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:48
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/109; C08L; C08L97/00; C08L97/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A process for the production of wood materials having high resistance to hot water which comprises adding (i) a solution containing 30 - 80 wt % of alkylene carbonate in 30%-40% aqueous formaldehyde to (ii) an alkaline condensed phenol-aldehyde resin having an aldehyde: phenol mole ratio of at least about 1.6:1, a viscosity at a solids content of 48 wt % of above 200 cps measured at 20°C in the Hoppler viscosimeter, an alkali hydroxide content of 0.05 - 2 moles per mole of phenol, and a free phenol content of less than 6 wt %, said mixture containing 0.01-1 mole of alkylene carbonate per mole of total phenol; adding said mixture to wood flour, wood chips, wood veneer, or wood paper; and curing to form a wood material characterized by high resistance to hot water.
Claim 2
Dependent Claim
136 words
A process for the production of wood materials having high resistance to hot water which comprises adding (i) a solution containing 30 - 80 wt % of alkylene carbonate in 30%-40% aqueous formaldehyde to (ii) an alkaline condensed phenol-aldehyde resin having an aldehyde: phenol mole ratio of at least about 1.6:1, a viscosity at a solids content of 48 wt % of above 200 cps measured at 20°C in the Hoppler viscosimeter, an alkali hydroxide content of 0.05 - 2 moles per mole of phenol, and a free phenol content of less than 6 wt %, said mixture containing 0.01-1 mole of alkylene carbonate per mole of total phenol; adding said mixture to wood flour, wood chips, wood veneer, or wood paper; and curing to form a wood material characterized by high resistance to hot water.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1 wherein said alkylene carbonate is ethylene carbonate.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 1 wherein said alkylene carbonate is propylene carbonate.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1 wherein said aqueous formaldehyde solution is 37% aqueous formaldehyde.
Claim 6
Dependent Claim
128 words
A wood material characterized by improved resistance to hot water and increased weather resistance which comprises a body of wood products bonded together by the addition thereto, prior to curing, of (i) a solution containing 30-80 wt % of alkylene carbonate in 30% - 42% aqueous formaldehyde admixed with (ii) an alkaline condensed phenol - aldehyde resin having an aldehyde: phenol mole ratio of at least about 1.6:1, a viscosity at a solids content of 48 wt % of above 200 cps measured at 204 in the Hoppler viscosimeter, an alkali hydroxide content of 0.05 - 2 moles per mole of phenol, and a free phenol content of less than 6 wt %, said mixture containing 0.01 - 1 mole of alkylene carbonate per mole of total phenol.
Claim 7
Dependent Claim
128 words
A wood material characterized by improved resistance to hot water and increased weather resistance which comprises a body of wood products bonded together by the addition thereto, prior to curing, of (i) a solution containing 30-80 wt % of alkylene carbonate in 30% - 42% aqueous formaldehyde admixed with (ii) an alkaline condensed phenol - aldehyde resin having an aldehyde: phenol mole ratio of at least about 1.6:1, a viscosity at a solids content of 48 wt % of above 200 cps measured at 204 in the Hoppler viscosimeter, an alkali hydroxide content of 0.05 - 2 moles per mole of phenol, and a free phenol content of less than 6 wt %, said mixture containing 0.01 - 1 mole of alkylene carbonate per mole of total phenol.
References Cited (Backward Citations)
US3342776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |