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US4028120A Expired / Lapsed US ⏱️ 0.0 years remaining

Mold release agent for urethane foamed rubber

Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1974-12-20
•
Granted: 1977-06-07
•
Expires: 1994-12-20
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Abstract

Abstract A mold release agent for foamed rubber formulated from the sodium soap of tall oil acids, kerosene and paraffin wax has improved mold release properties. This mold release agent is effectively removed from the molded articles by water washing, thus eliminating the need of hydrocarbon solvents. A preferred method of manufacture of the mold release agent is also described combining the tall oil and a paraffin base oil and heating to 125 DEG F., neutralizing with aqueous alkaline solution dehydrating and heating to 315 DEG F., adding 25% more paraffin base, cooling while stirring, adding wax at 245 DEG F. and finally adding kerosene when mixture has cooled to 130 DEG F., to provide an improved mold release agent.

Inventors

  • 👤 Robert Earl Emond

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 20:14
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29K; B29K2075/00; B29K2105/00; B29K2105/04; B29K2705/00; B29L; B29L2031/00; B29L2031/58

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 58 words
A mold release agent for applying to the surfaces of a mold, consisting essentially of from about 3 to about 25% by weight of the sodium soap of tall oil acids in admixture with from about 12 to about 38 wt. % kerosene, from about 3.5 to about 5 wt. % paraffin wax and a paraffin base oil.
Claim 2
Dependent Claim 58 words
A mold release agent for applying to the surfaces of a mold, consisting essentially of from about 3 to about 25% by weight of the sodium soap of tall oil acids in admixture with from about 12 to about 38 wt. % kerosene, from about 3.5 to about 5 wt. % paraffin wax and a paraffin base oil.
Claim 3
Dependent Claim 28 words
The mold release agent according to claim 1 wherein said paraffin base oil is a paraffin hydrocarbon material having a chain length of from 4 to 15 carbons.
Claim 4
Dependent Claim 24 words
The mold release agent according to claim 1 wherein said paraffin wax comprises a refined 125°/127° F. melting point wax containing 60% normal paraffins.
Claim 5
Dependent Claim 23 words
The mold release agent according to claim 3 wherein from about 22 to about 28 wt. % kerosene is employed in the formulation.
Claim 6
Dependent Claim 19 words
The mold release agent according to claim 4 wherein the amount of wax employed is about 3.8 wt. %.
Claim 7
Dependent Claim 32 words
A mold release agent for applying to the surfaces of a mold, comprising about 19% sodium tallate, about 27% kerosene, about 4% paraffin wax and 50 wt. % paraffin 20 base oil.
Claim 8
Dependent Claim 32 words
A mold release agent for applying to the surfaces of a mold, comprising about 19% sodium tallate, about 27% kerosene, about 4% paraffin wax and 50 wt. % paraffin 20 base oil.

References Cited (Backward Citations)

US2901361A Cited
US2993800A Cited
US2976160A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-06-06 1980-12-06 1981-06-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-06-06 1984-12-06 1985-06-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-06-06 1988-12-06 1989-06-07 $7700.00 Window Closed / Lapsed

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