Patent US2336166A successfully refreshed from Google Patents.
Patent US4649188A successfully refreshed from Google Patents.
US4649188A
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US
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Method for reducing 2-functional components in novolac resins and epoxy novolac resins prepared therefrom
Assignee: Dow Chemical Co
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Filing: 1986-01-13
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Granted: 1987-03-10
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Expires: 2006-01-13
Abstract
Abstract The 2-functional content of phenol-aldehyde novolac resins is reduced by water extraction. Epoxy novolac resins prepared from the novolac resin containing less 2-functional product exhibit increased Tg values when cured.
Inventors
- 👤 James L. Bertram
- 👤 Louis L. Walker
- 👤 Avis L. McCrary
- 👤 Fermin M. Cortez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:49
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/08; C08G59/18; C08G59/20; C08G59/32; C08G59/3218; C08G59/40; C08G59/62; C08G59/621
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A process for preparing a novolac resin having reduced quantities of 2-functional component, which process comprises (I) reacting in the presence of a suitable catalyst (A) a material having at least one aromatic hydroxyl group per molecule with (B) an aldehyde at a molar ratio of (B):(A) of from about 0.3:1 to about 0.95:1; (II) removing the excess aromatic hydroxyl-containing material; and (III) subjecting the product from step (II) to extraction with water until the resultant product contains at least about 25 percent by weight less of 2-functional component than was present after step II.
Claim 2
Dependent Claim
95 words
A process for preparing a novolac resin having reduced quantities of 2-functional component, which process comprises (I) reacting in the presence of a suitable catalyst (A) a material having at least one aromatic hydroxyl group per molecule with (B) an aldehyde at a molar ratio of (B):(A) of from about 0.3:1 to about 0.95:1; (II) removing the excess aromatic hydroxyl-containing material; and (III) subjecting the product from step (II) to extraction with water until the resultant product contains at least about 25 percent by weight less of 2-functional component than was present after step II.
Claim 3
Dependent Claim
68 words
A process of claim 1 wherein (i) said material having an average of at least one aromatic hydroxyl group is represented by the formula ##STR4## wherein each R is independently hydrogen, a halogen atom, a hydroxyl group or a hydrocarbon group having from 1 to about 9 carbon atoms; and (ii) said aldehyde is an aliphatic, cycloaliphatic or aromatic aldehyde having from 1 to about 14 carbon atoms.
Claim 4
Dependent Claim
63 words
A process of claim 2 wherein (i) said material having at least one aromatic hydroxyl group per molecule is phenol, methylphenol, butylphenol, bromophenol, chlorophenol, resorcinol or mixture thereof; (ii) said aldehyde is formaldehyde; (iii) said catalyst is oxalic acid; and (iv) the resultant product contains at least about 50 percent by weight less of the two-functional component than was present after step (II).
Claim 5
Dependent Claim
19 words
A process of claim 3 wherein said material having at least one aromatic hydroxyl group per molecule is phenol.
Claim 6
Dependent Claim
30 words
A process of claim 1 wherein in step (III), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 7
Dependent Claim
30 words
A process of claim 2 wherein in step (III), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 8
Dependent Claim
30 words
A process of claim 3 wherein in step (III), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 9
Dependent Claim
30 words
A process of claim 4 wherein in step (III), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 10
Dependent Claim
74 words
In a process for preparing a novolac resin by (A) reacting a material having at least one aromatic hydroxyl group per molecule with an aldehyde in the presence of a suitable catalyst and (B) recovering the resultant novolac resin therefrom; the improvement which comprises (C) contacting the recovered novolac resin with water until said novolac resin contains at least about 25 percent by weight less of two-functional component than was present after step (B).
Claim 11
Dependent Claim
74 words
In a process for preparing a novolac resin by (A) reacting a material having at least one aromatic hydroxyl group per molecule with an aldehyde in the presence of a suitable catalyst and (B) recovering the resultant novolac resin therefrom; the improvement which comprises (C) contacting the recovered novolac resin with water until said novolac resin contains at least about 25 percent by weight less of two-functional component than was present after step (B).
Claim 12
Dependent Claim
68 words
A process of claim 9 wherein (i) said material having an average of at least one aromatic hydroxyl group is represented by the formula ##STR5## wherein each R is independently hydrogen, a halogen atom, a hydroxyl group or a hydrocarbon group having from 1 to about 9 carbon atoms; and (ii) said aldehyde is an aliphatic, cycloaliphatic or aromatic aldehyde having from 1 to about 14 carbon atoms.
Claim 13
Dependent Claim
63 words
A process of claim 10 wherein (i) said material having at least one aromatic hydroxyl group per molecule is phenol, methylphenol, butylphenol, bromophenol, chlorophenol, resorcinol or mixture thereof; (ii) said aldehyde is formaldehyde; (iii) said catalyst is oxalic acid; and (iv) the resultant product contains at least about 50 percent by weight less of the two-functional component than was present after step (II).
Claim 14
Dependent Claim
19 words
A process of claim 11 wherein said material having at least one aromatic hydroxyl group per molecule is phenol.
Claim 15
Dependent Claim
30 words
A process of claim 9 wherein in step (C), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 16
Dependent Claim
30 words
A process of claim 10 wherein in step (C), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 17
Dependent Claim
30 words
A process of claim 11 wherein in step (C), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
Claim 18
Dependent Claim
30 words
A process of claim 12 wherein in step (C), a minor amount of at least one organic solvent selected from ketones, alcohols and glycol ethers is employed with the water.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |