US4118346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic resin recovery process
Assignee: Bendix Corp
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Filing: 1977-12-27
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Granted: 1978-10-03
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Expires: 1997-12-27
Abstract
Abstract A method of recovering a resin material from an infusible phenolic plastic composition. The infusible phenolic plastic composition is ground to a powder and mixed with an alkali solution to produce a liquid mixture. The liquid mixture is heated to a temperature selected between 260 DEG -340 DEG C and maintained at this temperature between 160 and 3 minutes causing the resin in the infusible phenolic plastic composition to dissolve in the alkali solution and produce a liquor. Thereafter the liquor is passed through a filter to remove any insoluble plastic composition therefrom. An acid solution when added to the filtered liquor causes a solid to precipitate from the liquor. The solid is separated from the liquor and washed in a water bath to remove any water soluble salts, phenols, and cresols from the recovered resin material.
Inventors
- 👤 Robert Milton Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:10
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/16; C08J2361/00; C08J2361/04; C08J2361/06; C08J2361/08; C08J2361/10; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A process for recovering a resin type material from an infusible phenolic plastic, comprising the steps of: placing a quantity of said infusible phenolic plastic in a container; adding an alkali solution to said infusible phenolic plastic to create a mixture; heating said mixture to a temperature between 260°-340° C causing at least a portion of said infusible phenolic plastic to dissolve into said alkali solution to create a liquor; filtering said liquor from said mixture to remove any undissolved infusible phenolic plastic and other insoluble materials therefrom; and acidifying said liquor by adding an acid solution thereto causing a phenolic type resin material therein to precipitate therefrom as a solid.
Claim 2
Dependent Claim
111 words
A process for recovering a resin type material from an infusible phenolic plastic, comprising the steps of: placing a quantity of said infusible phenolic plastic in a container; adding an alkali solution to said infusible phenolic plastic to create a mixture; heating said mixture to a temperature between 260°-340° C causing at least a portion of said infusible phenolic plastic to dissolve into said alkali solution to create a liquor; filtering said liquor from said mixture to remove any undissolved infusible phenolic plastic and other insoluble materials therefrom; and acidifying said liquor by adding an acid solution thereto causing a phenolic type resin material therein to precipitate therefrom as a solid.
Claim 3
Dependent Claim
24 words
The process, as recited in claim 1, further including the step of: filtering said acidified liquor to remove the solid resin type material therefrom.
Claim 4
Dependent Claim
35 words
The process, as recited in claim 2, further including the step of: washing said solid resin material with water to remove any water soluble salts, phenols, and cresols therefrom to purify said resin type material.
Claim 5
Dependent Claim
21 words
The process, as recited in claim 3, further including the step of: drying said resin type material to remove water therefrom.
Claim 6
Dependent Claim
47 words
The method, as recited in claim 4, further including the step of: maintaining said temperature of said mixture between said 260°-340° C for a time period of between 160 to 3 minutes to assure the optimum recovery of said resin type material from the infusible phenolic plastic.
Claim 7
Dependent Claim
28 words
The process, as recited in claim 5, further including the step of: sealing said container during said heating step to reduce the time required to develop said liquor.
Claim 8
Dependent Claim
10 words
The product produced from the process recited in claim 6.
Claim 9
Dependent Claim
149 words
A process for the recovery of a novolac type resin material from an infusible phenolic resin composition containing mineral and organic fillers comprising the steps: grinding a quantity of said infusible phenolic resin composition to a powder; placing said powder phenolic resin composition in a container; adding an alkali solution to said container; stirring said alkali solution and said powder phenolic resin composition together to create a substantially uniform liquid mixture; heating said liquid mixture to a temperature of between 260°-340° C in a selected time period of between 160 to 3 minutes causing at least a portion of said infusible phenolic resin composition to dissolve into said alkali solution and create a liquor; passing said liquor through a first filter to remove any undissolved infusible phenolic resin therefrom; and adding an acid solution to said filtered liquor causing a novolac type resin to precipitate therefrom as a solid.
Claim 10
Dependent Claim
149 words
A process for the recovery of a novolac type resin material from an infusible phenolic resin composition containing mineral and organic fillers comprising the steps: grinding a quantity of said infusible phenolic resin composition to a powder; placing said powder phenolic resin composition in a container; adding an alkali solution to said container; stirring said alkali solution and said powder phenolic resin composition together to create a substantially uniform liquid mixture; heating said liquid mixture to a temperature of between 260°-340° C in a selected time period of between 160 to 3 minutes causing at least a portion of said infusible phenolic resin composition to dissolve into said alkali solution and create a liquor; passing said liquor through a first filter to remove any undissolved infusible phenolic resin therefrom; and adding an acid solution to said filtered liquor causing a novolac type resin to precipitate therefrom as a solid.
Claim 11
Dependent Claim
56 words
The process, as recited in claim 8, further including the steps of: separating said solid from the acidified liquor by retaining the solid on a second filter; and washing said solid retained on the second filter in a water bath to remove any water soluble salts, phenols and cresols therefrom to purify said novolac type resin.
Claim 12
Dependent Claim
72 words
The process, as recited in claim 9, further including the steps of: maintaining said temperature of the liquid mixture between said 260°-320° C for a time period of between 160 to 3 minutes; and selecting an optimum temperature and time period to reduce any reaction of the alkali solution on any novolac type resin material dissolved therein and thereby prevent any further degradation of the novolac type material in the alkali solution.
References Cited (Backward Citations)
US2851433A
Cited
US4067854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |