Patent US4439489A successfully refreshed from Google Patents.
US4439489A
Expired / Lapsed
US
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Particles covered with a cured infusible thermoset film and process for their production
Assignee: Hexion Inc
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Filing: 1982-02-16
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Granted: 1984-03-27
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Expires: 2002-02-16
Abstract
Abstract An improved process is provided for preparing a product containing particles individually coated with a cured, thermoset phenolic resin. The process comprises mixing particulate matter with an uncured resin and a lubricant at a temperature which causes curing of the resin. The product obtained by this process shows superior properties as a propping agent for treating subterranean formations.
Inventors
- 👤 Calvin K. Johnson
- 👤 David R. Armbruster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:37
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/80; C09K8/805; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1037; C09K8/62; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998; Y10T428/31504; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
125 words
A process for the preparation of particulate matter coated with a cured phenolic resin wherein the improvement comprises mixing an uncured resin with particulate matter resistant to melting or decomposition at temperatures below about 450° F., preheated to a temperature of from about 300° F. to about 450° F., adding with continued mixing from about 0.03% to about 0.5% by weight, based on the weight of the particulate matter, of a lubricant to the mix of resin and particulate matter and maintaining the resultant mixture above about 300° F. for a sufficient time to cure the resin, whereby there is obtained a product containing individually coated particles having high abrasion resistance and improved crush resistance suitable for use as a propping agent in subterranean formations.
Claim 2
Dependent Claim
125 words
A process for the preparation of particulate matter coated with a cured phenolic resin wherein the improvement comprises mixing an uncured resin with particulate matter resistant to melting or decomposition at temperatures below about 450° F., preheated to a temperature of from about 300° F. to about 450° F., adding with continued mixing from about 0.03% to about 0.5% by weight, based on the weight of the particulate matter, of a lubricant to the mix of resin and particulate matter and maintaining the resultant mixture above about 300° F. for a sufficient time to cure the resin, whereby there is obtained a product containing individually coated particles having high abrasion resistance and improved crush resistance suitable for use as a propping agent in subterranean formations.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the particulate material is sand.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the phenolic resin is a resole resin.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the phenolic resin is a novolak resin and a curing agent is added.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the curing agent is hexamethylenetetramine.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the lubricant is a silicone liquid.
Claim 8
Dependent Claim
27 words
The process of claim 6 wherein the silicone liquid is added to the mix of resin and particulate matter before said mix breaks up into free-flowing particles.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the lubricant is mineral oil.
Claim 10
Dependent Claim
27 words
The process of claim 8 wherein the mineral oil is added to the mix of resin and particulate matter before said mix breaks up into free-flowing particles.
Claim 11
Dependent Claim
14 words
The process of claim 1 wherein the lubricant is a bis-stearonide of a diomine.
Claim 12
Dependent Claim
27 words
The process of claim 5 wherein the uncured resin is mixed with the particulate matter at a temperature of from about 350° F. to about 400° F.
Claim 13
Dependent Claim
95 words
Coated particulate matter consisting essentially of particles individually coated with a cured phenolic resin prepared by mixing an uncured resin with particulate matter resistant to melting or decomposition at temperatures below about 450° F., preheated to a temperature of from about 300° F. to about 450° F., adding with continued mixing from about 0.03% to about 0.5% by weight, based on the weight of the particulate matter, of a lubricant to the mix of resin and particulate matter and maintaining the resultant mixture above about 300° F. for a sufficient time to cure the resin.
Claim 14
Dependent Claim
95 words
Coated particulate matter consisting essentially of particles individually coated with a cured phenolic resin prepared by mixing an uncured resin with particulate matter resistant to melting or decomposition at temperatures below about 450° F., preheated to a temperature of from about 300° F. to about 450° F., adding with continued mixing from about 0.03% to about 0.5% by weight, based on the weight of the particulate matter, of a lubricant to the mix of resin and particulate matter and maintaining the resultant mixture above about 300° F. for a sufficient time to cure the resin.
Claim 15
Dependent Claim
13 words
The coated particulate matter of claim 12 wherein the particulate matter is sand.
Claim 16
Dependent Claim
15 words
The coated particulate matter of claim 12 wherein the phenolic resin is a resole resin.
Claim 17
Dependent Claim
21 words
The coated particulate matter of claim 12 wherein the phenolic resin is a novolak resin and a curing agent is added.
Claim 18
Dependent Claim
13 words
The coated particulate matter of claim 15 wherein the curing agent is hexamethylenetetramine.
Claim 19
Dependent Claim
14 words
The coated particulate matter of claim 12 wherein the lubricant is a silicone liquid.
Claim 20
Dependent Claim
29 words
The coated particulate matter of claim 17 wherein the silicone liquid is added to the mix of resin and particulate matter before said mix breaks up into free-flowing particles.
Claim 21
Dependent Claim
13 words
The coated particulate matter of claim 12 wherein the lubricant is mineral oil.
Claim 22
Dependent Claim
29 words
The coated particulate matter of claim 19 wherein the mineral oil is added to the mix of resin and particulate matter before said mix breaks up into free-flowing particles.
Claim 23
Dependent Claim
16 words
The coated particulate matter of claim 12 wherein the lubricant is a bis-stearamide of a diomine.
Claim 24
Dependent Claim
29 words
The coated particulate matter of claim 16 wherein the uncured resin is mixed with the particulate matter at a temperature of from about 350° F. to about 400° F.
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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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |