Patent US3537595A successfully refreshed from Google Patents.
US4468359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foundry moulds and cores
Assignee: Hexion UK Ltd
•
Filing: 1982-11-09
•
Granted: 1984-08-28
•
Expires: 2002-11-09
Abstract
Abstract A foundry moulding composition comprising (a) a granular refractory material, and (b) from 0.5% to 8% based on the weight of the refractory material of a binder comprising (i) an aqueous solution of a potassium alkali phenol-formaldehyde resin, said aqueous solution having a solids content of from 50% to 75% and said resin having a weight average molecular weight (M w ) of from 600 to 1500, a formaldehyde:phenol molar ratio of from 1.2:1 to 2.6:1 and a potassium hydroxide:phenol molar ratio of from 0.2:1 to 1.2:1 and (ii) at least one silane in an amount of from 0.05% to 3% based on the weight of said aqueous solution, said binder being curable by contact therewith of from 5% to 60% based on the weight of said aqueous solution of a C 1-3 alkyl formate.
Inventors
- 👤 Peter H. R. B. Lemon
- 👤 Jeffrey D. Railton
- 👤 Peter R. Ludlam
- 👤 Timothy J. Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:14
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08L; C08L61/00; C08L61/04; C08L61/06; C08L61/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
A process for the production of foundry moulds or cores which comprises: mixing a granular refractory material with from 0.5% to 8% based on the weight of the refractory material of a binder solution, said binder solution comprising (i) an aqueous solution of a potassium alkali phenol-formaldehyde resin, said aqueous solution having a solids content of from 50% to 75% and said resin having a weight average molecular weight (M w ) of from 600 to 1500, a formaldehyde:phenol molar ratio of from 1.2:1 to 2.6:1 and a potassium hydroxide:phenol molar ratio of from 0.2:1 to 1.2:1 and (ii) at least one silane in an amount of from 0.05% to 3% based on the weight of said aqueous solution, discharging the mixture into a vented core or mould box, and gassing the formed mixture with at least one C 1-3 alkyl formate to cure the binder.
Claim 2
Dependent Claim
146 words
A process for the production of foundry moulds or cores which comprises: mixing a granular refractory material with from 0.5% to 8% based on the weight of the refractory material of a binder solution, said binder solution comprising (i) an aqueous solution of a potassium alkali phenol-formaldehyde resin, said aqueous solution having a solids content of from 50% to 75% and said resin having a weight average molecular weight (M w ) of from 600 to 1500, a formaldehyde:phenol molar ratio of from 1.2:1 to 2.6:1 and a potassium hydroxide:phenol molar ratio of from 0.2:1 to 1.2:1 and (ii) at least one silane in an amount of from 0.05% to 3% based on the weight of said aqueous solution, discharging the mixture into a vented core or mould box, and gassing the formed mixture with at least one C 1-3 alkyl formate to cure the binder.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the refractory material is selected from the group comprising silica sand, quartz, chromite sand, zircon, olivine sand or beach sands containing shell fragments.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the refractory material is chromite sand, olivine sand or beach sands containing shell fragments.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the M w of said resin is from 700 to 1100.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the potassium hydroxide:phenol molar ratio is from 0.3:1 to 1:1.
Claim 7
Dependent Claim
18 words
The process of claim 4 or 5 wherein the potassium hydroxide:phenol molar ratio is from 0.4:1 to 0.6:1.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the formaldehyde:phenol molar ratio is from 1.5:1 to 2.2:1.
Claim 9
Dependent Claim
15 words
The process of claim 6 wherein the formaldehyde:phenol molar ratio is from 1.5:1 to 2.2:1.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein said refractory material is mixed with from 1% to 3% based on the weight of the refractory material of said binder solution.
Claim 11
Dependent Claim
26 words
The process of 1 wherein the mixture is gassed with from 5% to 60% based on the weight of the aqueous solution of said alkyl formate.
Claim 12
Dependent Claim
26 words
The process of 1 wherein the mixture is gassed with from 5% to 60% based on the weight of the aqueous solution of said alkyl formate.
Claim 13
Dependent Claim
27 words
The process of claim 10 wherein the mixture is gassed with from 15% to 35% based on the weight of the aqueous solution of said alkyl formate.
Claim 14
Dependent Claim
12 words
The process of claim 11 wherein said alkyl formate is methyl formate.
Claim 15
Dependent Claim
17 words
The process of claim 1 or 12 wherein said alkyl formate is dispersed in a carrier gas.
Claim 16
Dependent Claim
22 words
The process of claim 13 wherein the concentration of said formate in the carrier gas is from 0.5% to 5% by volume.
References Cited (Backward Citations)
DE1065605B
Cited
US3234159A
Cited
US3599433A
Cited
US3720642A
Cited
US3696622A
Cited
JPS50130627A
Cited
GB2059972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |