Patent US4663418A successfully refreshed from Google Patents.
US4663418A
Expired / Lapsed
US
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Novel calcium hydroxide catalyzed phenolic resin binder and method
Assignee: Rain Carbon Germany GmbH
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Filing: 1985-12-31
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Granted: 1987-05-05
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Expires: 2005-12-31
Abstract
Abstract An improved moisture-stable phenolic resin binder with calcium ions from the catalyst complexed with the phenolic resin and a process for its preparation and laminate boards with the said binder as the binding agent.
Inventors
- 👤 Karl Jellinek
- 👤 Rolf Muller
- 👤 Gerhard Wisomirski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:33
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
A proces for the preparation of a moisture-stable phenolic resin binder comprising condensing a phenol and formaldehyde in an aqueous media in the presence of calcium hydroxide as catalyst to form a condensation product, cooling the reaction mixture after the condensation to 10° to 20° C., adjusting the pH of the reaction mixture to 8.5 to 10.5 by addition of a base and then adding 0.8 to 2.0 moles of sulfate ions per mol of the calcium ions while maintaining the pH in the range of 8.5 to 10.5.
Claim 2
Dependent Claim
89 words
A proces for the preparation of a moisture-stable phenolic resin binder comprising condensing a phenol and formaldehyde in an aqueous media in the presence of calcium hydroxide as catalyst to form a condensation product, cooling the reaction mixture after the condensation to 10° to 20° C., adjusting the pH of the reaction mixture to 8.5 to 10.5 by addition of a base and then adding 0.8 to 2.0 moles of sulfate ions per mol of the calcium ions while maintaining the pH in the range of 8.5 to 10.5.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the molar ratio of phenol to formaldehyde is 1:1.3 to 1:4.0.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the amount of calcium hydroxide is 0.5 to 10.0% by weight based on the phenolic resin.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the phenolic resin contains up to 100 parts by weight of urea per 100 parts by weight phenol charged.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the base added is ammonia.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the sulfate ions are added in the form of ammonium sulfate.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the moles of sulfate ions added are 0.8 to 1.2 moles per mole of calcium ions.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |