US4876324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight ortho cresol-novolak resins and process for the preparation thereof using alcoholic or acidic organic solvents
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-05-13
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Granted: 1989-10-24
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Expires: 2007-05-13
Abstract
Abstract Orthocresol or a mixture of orthocresol and paracresol and an aldehyde compound or a derivative thereof are subjected to polycondensation in a solvent selected from an aliphatic alcohol having 3 to 12 carbon atoms, a glycol ether having 3 to 6 carbon atoms, benzyl alcohol and an aliphatic carboxylic acid having 2 to 6 carbon atoms, in the presence of an acid catalyst, to obtain linear and high molecular weight orthocresol-novolak resins or orthocresol/paracresol random copolymerized novolak resins which have a high softening point of 145 DEG C. or higher and a high number average molecular weight of 1500 or more and which are highly soluble in alcohols and ketones and are highly compatible with resins.
Inventors
- 👤 Yoshitomo Nakano
- 👤 Masumi Kada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:26
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/04; C08L61/06; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; C08L63/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A process for preparing a high molecular weight cresol-novolak resin having a softening point of 30° C. or higher, consisting essentially of polycondensing orthocresol or a mixture of orthocresol and paracresol with an aldehyde compound or a derivative thereof in a solvent selected from the group consisting of C 3-12 aliphatic monoalcohols, C 3-6 monohydric glycol ethers and benzyl alcohol, in the presence of a protonic acid catalyst.
Claim 2
Dependent Claim
68 words
A process for preparing a high molecular weight cresol-novolak resin having a softening point of 30° C. or higher, consisting essentially of polycondensing orthocresol or a mixture of orthocresol and paracresol with an aldehyde compound or a derivative thereof in a solvent selected from the group consisting of C 3-12 aliphatic monoalcohols, C 3-6 monohydric glycol ethers and benzyl alcohol, in the presence of a protonic acid catalyst.
Claim 3
Dependent Claim
12 words
The process as claimed in claim 1, wherein said aldehyde is paraformaldehyde.
Claim 4
Dependent Claim
25 words
The process as claimed in claim 1, wherein said solvent is selected from the group consisting of methyl cellosolve, ethyl cellosolve, butyl cellosolve, and n-butanol.
Claim 5
Dependent Claim
30 words
The process as claimed in claim 1, wherein the amount of said solvent to be used is 150 to 300 parts by weight per 100 parts by weight of orthocresol.
Claim 6
Dependent Claim
40 words
The process of claim 1, wherein said polycondensing step consisting essentially of: mixing said orthocresol or said mixture of orthocresol and paracresol, said aldehyde compound, said solvent and said catalyst to form a reaction mixture; and heating said reaction mixture.
Claim 7
Dependent Claim
62 words
The process of claim 1, wherein said polycondensing step consisting essentially of: mixing one of (a) said orthocresol or a mixture of orthocresol and paracresol, or (b) said aldehyde compound, said solvent, and said catalyst to form a reaction mixture; heating said reaction mixture; and adding said catalyst and one of (a) or (b) which was not used in said mixing step.
Claim 8
Dependent Claim
49 words
The method of claim 1, wherein said polycondensing step consisting essentially of the steps of: mixing said orthocresol or said mixture of orthocresol and paracresol, said aldehyde component, and said solvent to form a reaction mixture; heating said reaction mixture; and adding said catalyst to said heated reaction mixture.
Claim 9
Dependent Claim
19 words
The process of claim 1, wherein said polycondensing step is conducted at a temperature of 95° C. or higher.
Claim 10
Dependent Claim
18 words
The process of claim 8, wherein said polycondensing step is conducted at a temperature between about 105°-150° C.
Claim 11
Dependent Claim
22 words
The process of claim 1, wherein water is present in an amount of 15 wt. % or less during said polycondensing step.
Claim 12
Dependent Claim
23 words
The method of claim 10, wherein said water is present in an amount of 10 wt. % or less during said polycondensing step.
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |