US3801335A
Expired / Lapsed
US
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Pattern wax composition
Assignee: Atlantic Richfield Co
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Filing: 1970-11-16
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Granted: 1974-04-02
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Expires: 1990-11-16
Abstract
Abstract Novel pattern wax composition for use in investment casting by the Lost Wax Process are disclosed. The pattern materials consist essentially of waxes such as petroleum waxes, natural vegetable or mineral waxes, synthetic waxes and various resinous materials derived from the refining of petroleum and wood rosin, and mixtures of the above. The base wax generally has a melting point of between about 120 to 180*F. The base wax composition is improved by the inclusion of up to about 75 percent by weight, preferably up to about 50 percent by weight of solid filler particles of pentaerythritol or oligomer thereof. Pentaerythritol is the preferred filler.
Inventors
- 👤 A Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:51
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
10 words
A composition of claim 1 wherein the filler is pentaerythritol.
Claim 2
Dependent Claim
17 words
A composition of claim 2 wherein the filler has a particle size up to about 600 microns.
Claim 3
Dependent Claim
91 words
A composition consisting essentially of from about 25 to about 95 parts by weight of said composition of a base wax wherein said base wax comprises from about 5 to about 40 parts by weight paraffin wax, from about 5 to about 40 parts by weight of a microcrystalline wax and from about 5 to about 40 parts by weight of a vegetable wax, and about 5 to about 75 parts by weight of said composition of a filler selected from the group consisting of pentaerythritol, di-pentaerythritol, tri-pentaerythritol, and mixtures thereof.
Claim 4
Dependent Claim
43 words
A composition of claim 4 wherein the base wax contains an additional component of from 1 to about 50 parts by weight each of one or more resinous components having a softening point within the range of from about 125* to about 350*F.
Claim 5
Dependent Claim
38 words
A composition of claim 5 wherein the resinous component material is selected from the group consisting of a vinyl toluene Alpha -methyl styrene interpolymer resin, a terpene resin, a dimerized resin acid from wood rosin and mixtures thereof.
Claim 6
Dependent Claim
27 words
A composition of claim 6 wherein the resinous component is a mixture of vinyl toluene Alpha -methyl styrene interpolymer resin and dimerized resin acid from wood rosin.
Claim 7
Dependent Claim
23 words
A composition of claim 6 wherein the resinous component is a mixture of dimerized resin acid from wood rosin and a terpene resin.
Claim 8
Dependent Claim
88 words
In a process for forming a mold of desired shape in which a pattern material is shaped in a mold of the desired shape, the molded pattern material is coated with a slurry of finely-divided refractory material, the coating is dried, the coatings and drying being repeated to build up a total refractory coating of a desired thickness and the pattern material removed by melting from within the coating to form a refractory mold, the improvement which comprises using as said pattern material a composition of claim 1.
Claim 9
Dependent Claim
44 words
A process of claim 9 wherein the composition of claim 1 consists essentially of from about 25 to about 95 parts by weight of said composition of a base wax and about 5 to about 75 parts by weight of said composition of pentaerythritol.
Claim 10
Dependent Claim
18 words
A process of claim 10 wherein the pentaerythritol filler has a particle size up to about 600 microns.
Claim 11
Dependent Claim
88 words
In a process for forming a mold of desired shape in which a pattern material is shaped in a mold of the desired shape, the molded pattern material is coated with a slurry of finely-divided refractory material, the coating is dried, the coatings and drying being repeated to build up a total refractory coating of a desired thickness and the pattern material removed by melting from within the coating to form a refractory mold, the improvement which comprises using as said pattern material a composition of claim 5.
Claim 12
Dependent Claim
43 words
A process of claim 12 wherein the base wax contains an additional component of From 1 to about 50 parts by weight each of one or more resinous components having a softening point within the range of from about 125* to about 350*F.
Claim 13
Dependent Claim
38 words
A process of claim 13 wherein the resinous component material is selected from the group consisting of a vinyl toluene Alpha -methyl styrene interpolymer resin, a terpene resin, a dimerized resin acid from wood rosin and mixtures thereof.
Claim 14
Dependent Claim
27 words
A process of claim 14 wherein the resinous component is a mixture of vinyl toluene Alpha -methyl styrene interpolymer resin and dimerized resin acid from wood rosin.
Claim 15
Dependent Claim
23 words
A process of claim 14 wherein the resinous component is a mixture of dimerized resin acid from wood rosin and a terpene resin.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |