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US4795600A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for molding articles using barrier coatings

Assignee: RTX Corp
•
Filing: 1986-11-14
•
Granted: 1989-01-03
•
Expires: 2006-11-14
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Abstract

Abstract Barriers used for separating silicone pressurizing medium from articles during curing, thereby protecting the article from silicone contamination. A composite precursor is substantially encapsulated by a barrier coating that is capable of substantially separating the composite precursor from silicone polymers at elevated temperatures during curing. The barrier coating is also capable of being chemically removed from the composite precursor subsequent to its cure without substantially damaging the composite. Composites are molded by protecting a composite precursor from a silicone pressurizing medium during curing utilizing a barrier coating. The method comprises encapsulating a composite precursor with a coating that is substantially capable of separating the composite precursor from silicone polymers at elevated temperatures. The coating is also capable of being chemically removed from the composite without damaging the composite. The precursor is cured by causing a silicone polymer to apply pressure to the precursor and exposing the precursor to elevated temperatures. Then the coating is chemically removed from the composite.

Inventors

  • 👤 Robert V. Kromrey

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 14:21
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/32; B29C43/003; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/44; B29C70/54; B29C70/542; B29C43/02; B29C43/10; B29C43/12; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 100 words
A method for molding a composite precursor to form a composite comprising (a) encapsulating said composite precursor with a chemically dissolvable metal foil coating that (i) is substantially capable of separating said composite precursor from particulate silicone at elevated temperatures; and (ii) is capable of being chemically removed from said composite without damaging said composite; (b) curing said precursor by causing said particulate silicone to apply pressure through said foil to said precursor and exposing said precursor to elevated temperatures; and (c) chemically removing said coating from said composite; whereby said composite precursor is protected from silicone contamination during curing.
Claim 2
Independent Claim 100 words
A method for molding a composite precursor to form a composite comprising (a) encapsulating said composite precursor with a chemically dissolvable metal foil coating that (i) is substantially capable of separating said composite precursor from particulate silicone at elevated temperatures; and (ii) is capable of being chemically removed from said composite without damaging said composite; (b) curing said precursor by causing said particulate silicone to apply pressure through said foil to said precursor and exposing said precursor to elevated temperatures; and (c) chemically removing said coating from said composite; whereby said composite precursor is protected from silicone contamination during curing.
Claim 3
Dependent Claim 14 words
The method as recited in claim 1 wherein said coating comprises aluminum alloys .
Claim 4
Dependent Claim 26 words
The method as recited in claim 2 wherein said coating is chemically removed with a mixture comprising tetrasodium pyrophosphate, trisodium phosphate and a suitable wetting agent.
Claim 5
Dependent Claim 22 words
The method as recited in claim 2 wherein said composite precursor is wrapped in said metal foil and sealed with conventional tape.
Claim 6
Dependent Claim 18 words
The method as recited in claim 2 wherein said metal foil is less than about 0.25 cm thick.
Claim 7
Dependent Claim 21 words
The method as recited in claim 2 wherein said metal foil is about 0.0015 cm to about 0.01 cm in thickness.
Claim 8
Dependent Claim 41 words
The method as recited in claim 5 wherein said particulate silicone polymer and said foil covered composite precursor are disposed in a pressure vessel and said foil confines any condensation products and ducts said condensation products out of said pressure vessel.
Claim 9
Dependent Claim 41 words
The method as recited in claim 6 wherein said particulate silicone polymer and said foil covered composite precursor are disposed in a pressure vessel and said foil confines any condensation products and ducts said condensation products out of said pressure vessel.
Claim 10
Dependent Claim 41 words
The method as recited in claim 4 wherein said particulate silicone polymer and said foil covered composite precursor are disposed in a pressure vessel and said foil confines any condensation products and ducts said condensation products out of said pressure vessel.

References Cited (Backward Citations)

US1909177A Cited
US2661153A Cited
DE2134168A1 Cited
US3919379A Cited
US4167430A Cited
US4351880A Cited
US4264556A Cited
US4428906A Cited
US4654235A Cited
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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) 1992-01-03 1992-07-04 1993-01-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-01-03 1996-07-04 1997-01-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-01-03 2000-07-04 2001-01-03 $7700.00 Window Closed / Lapsed

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