Patent US3674732A successfully refreshed from Google Patents.
US3674732A
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Rosin modified phenolic resins and method of preparing same
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1969-12-10
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Granted: 1972-07-04
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Expires: 1989-12-10
Abstract
Abstract A method of preparing phenolic resins suitable for the production of inks, characterized in that p-cumyl phenol, formaldehyde, a polyhydroxy alcohol and rosin are polymerized at a temperature of from 130* C. to 270* C. in the presence of a catalyst selected from salts of zinc, calcium, magnesium or manganese with organic or inorganic acids having a dissociation constant (or initial dissociation constant) of less than 1.8 X 10 5, the molar ratio of p-cumyl phenol to formaldehyde being between 1:2.5 and 1:4 and the quantity of rosin from 150 to 200 parts by weight per 100 parts by weight of the phenol.
Inventors
- 👤 Mario Pitzalis
- 👤 Silvio Vargiu
- 👤 Ugo Nistri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:51
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/34; C08G8/04; C08G8/08; C08G8/12; C08G8/38; C09; C09D; C09D11/00; C09D11/02; C09D11/10; C09D11/102; C09D11/103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
A method as in claim 1 wherein the polyhydroxy alcohol is selected from the group consisting of glycerine, sorbitol and pentaerythritol.
Claim 2
Dependent Claim
9 words
Phenolic resin prepared by the process of claim 1.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein said formaldehyde is paraformaldehyde.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein said rosin is derived from a member selected from the group consisting of tall oil and wood.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |