US4169937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a granular thermosetting moulding composition containing a novolak having modified surface characteristics
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1976-12-07
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Granted: 1979-10-02
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Expires: 1996-12-07
Abstract
Abstract A granular thermosetting composition free from a tendency to release dust and transformable into molded articles free from surface defects, is obtained by forming the composition into granules of from 2 to 8 mm in size and mixing said granules with from 0.5 to 3 wt.% of one or more substances, in liquid form, chosen from acetone, phenol, aniline and reaction products of phenol with styrene.
Inventors
- 👤 Silvio Vargiu
- 👤 Pier L. Manzoni
- 👤 Mario Bernasconi
- 👤 Antonio Parodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08L; C08L61/00; C08L61/04; C08L61/06; C08J2361/00; C08J2361/04; C08J2361/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A method for preparing a granular thermosetting molding composition including a novolak phenolic resin with modified surface characteristics, which comprises forming said molding composition into granules of from 2 to 8 mm in size and mixing said granules with an amount of from 0.5 to 3 wt.%, based on the weight of the granules, of one or more substances selected from the group consisting of acetone, phenol, aniline and reaction products of a styrene with phenol, wherein said reaction products are obtained by reacting phenol and styrene in the presence of an acid catalyst and have a density at 25° C. of from 1.080 to 1.087, a refractive index N D 25 of from 1.577 to 1.584 and a viscosity at 25° C. of from 50 to 62 cps, at a temperature such as to maintain said substances in liquid form and for a period such as to ensure absorption of said substances by said granules, whereby the surface of said granules is modified, without altering other characteristics of the granules, to render the granules free from a tendency to release dust during handling.
Claim 2
Independent Claim
184 words
A method for preparing a granular thermosetting molding composition including a novolak phenolic resin with modified surface characteristics, which comprises forming said molding composition into granules of from 2 to 8 mm in size and mixing said granules with an amount of from 0.5 to 3 wt.%, based on the weight of the granules, of one or more substances selected from the group consisting of acetone, phenol, aniline and reaction products of a styrene with phenol, wherein said reaction products are obtained by reacting phenol and styrene in the presence of an acid catalyst and have a density at 25° C. of from 1.080 to 1.087, a refractive index N D 25 of from 1.577 to 1.584 and a viscosity at 25° C. of from 50 to 62 cps, at a temperature such as to maintain said substances in liquid form and for a period such as to ensure absorption of said substances by said granules, whereby the surface of said granules is modified, without altering other characteristics of the granules, to render the granules free from a tendency to release dust during handling.
Claim 3
Dependent Claim
50 words
The method of claim 1, wherein said molding composition further includes from 15 to 50 wt.% of novolak phenolic resin, from 3 to 10 wt.% of hexamine, from 0.5 to 2 wt.% of alkaline earth metal oxide and one or more inert fillers, based on the weight of the composition.
Claim 4
Dependent Claim
24 words
The method of claim 1, wherein said amount of said acetone is from 1 to 1.5 wt.%, based on the weight of the granules.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the surface modified granules are transformable by molding into manufactured articles free from surface defects.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein said mixing is at 20°-30° C. for 5-30 minutes.
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) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |