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US3734982A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for case bonding cast composite propellant grains

Assignee: United States Department of the Navy
•
Filing: 1962-02-02
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Granted: 1973-05-22
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Expires: 1982-02-02
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Abstract

Abstract 1. The method of bonding composite propellant grains to rocket motor tubes which comprises A. COATING THE INSIDE OF THE TUBE WITH A FORMULATION CONSISTING ESSENTIALLY OF 60 PERCENT BY WEIGHT CASTOR OIL AND 31 PERCENT BY WEIGHT 2,4-TOLUENE DIISOCYANATE TO FORM A FIRST LINER, B. APPLYING TO SAID FIRST LINER BEFORE CURING A SECOND LINER CONSISTING OF A SILICON TAPE COMPOSED OF GLASS CLOTH IMPREGNATED WITH A COMPOSITION CONSISTING ESSENTIALLY OF 1. A BENZENE SOLUBLE RESIN POLYMER COMPOSED ESSENTIALLY OF STRUCTURAL UNITS OF SiO2 and R3SiO1/2 where R is a monovalent hydrocarbon selected from the group consisting of alkyl radicals of less than four carbon atoms and phenyl and at least 90 percent of the total number of R radicals are alkyl and in said copolymer the ratio of R3SiO1/2 units is between 0.6 to 0.9 inclusive, and 2. A BENZENE SOLUBLE ORGANOSILOXANE OF AT LEAST 1 MILLION CENTISTOKES VISCOSITY AT 25* C., said organosiloxane having the general formula R''2SiO wherein R'' is a monovalent hydrocarbon radical selected from the group consisting of methyl and phenyl and at least 90 percent of the total number of R'' radicals are methyl. C. CASTING A COMPOSITE PROPELLANT COMPOSITION INTO SAID TUBE, AND D. CURING UP TO 4 HOURS AT TEMPERATURES RANGING UP TO 200* F.; whereby the first and second liners and the propellant grain together are firmly bonded to the inside of the motor tube.

Inventors

  • 👤 H Sampson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 20:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/36; F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 66 words
A BENZENE SOLUBLE RESIN POLYMER COMPOSED ESSENTIALLY OF STRUCTURAL UNITS OF SIO2 AND R3SIO1/2 WHERE R IS A MONOVALENT HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN FOUR CARBON ATOMS AND PHENYL AND AT LEAST 90 PERCENT OF THE TOTAL NUMBER OF R RADICIALS ARE ALKYL AND IN SAID COPOLYMER THE RATIO OF R3SIO1/2 UNITS IS BETWEEN 0.6 TO 0.9 INCLUSIVE, AND
Claim 2
Dependent Claim 66 words
A BENZENE SOLUBLE RESIN POLYMER COMPOSED ESSENTIALLY OF STRUCTURAL UNITS OF SIO2 AND R3SIO1/2 WHERE R IS A MONOVALENT HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN FOUR CARBON ATOMS AND PHENYL AND AT LEAST 90 PERCENT OF THE TOTAL NUMBER OF R RADICIALS ARE ALKYL AND IN SAID COPOLYMER THE RATIO OF R3SIO1/2 UNITS IS BETWEEN 0.6 TO 0.9 INCLUSIVE, AND
Claim 3
Independent Claim 71 words
THE METHOD OF BONDING COMPOSITE PROPELLANT GRAINS TO ROCKET MOTOR TUBES WHICH COMPRISES A. COATING THE INSIDE OF THE TUBE WITH A FORMULATION CONSISTING ESSENTIALLY OF 60 PERCENT BY WEIGHT CASTOR OIL AND 31 PERCENT BY WEIGHT 2,4-TOLUENE DIISOCYANATE TO FORM A FIRST LINER, B. APPLYING TO SAID FIRST LINER BEFORE CURING A SECOND LINER CONSISTING OF A SILICON TAPE COMPOSED OF GASS CLOTH IMPREGNATED WITH A COMPOSITION CONSISTING ESSENTIALLY OF
Claim 4
Independent Claim 71 words
THE METHOD OF BONDING COMPOSITE PROPELLANT GRAINS TO ROCKET MOTOR TUBES WHICH COMPRISES A. COATING THE INSIDE OF THE TUBE WITH A FORMULATION CONSISTING ESSENTIALLY OF 60 PERCENT BY WEIGHT CASTOR OIL AND 31 PERCENT BY WEIGHT 2,4-TOLUENE DIISOCYANATE TO FORM A FIRST LINER, B. APPLYING TO SAID FIRST LINER BEFORE CURING A SECOND LINER CONSISTING OF A SILICON TAPE COMPOSED OF GASS CLOTH IMPREGNATED WITH A COMPOSITION CONSISTING ESSENTIALLY OF
Claim 5
Dependent Claim 94 words
A BENZENE SOLUBLE ORGANOSILOXANE OF AT LEAST 1 MILLION CENTISTOKES VISCOSITY AT 25*C., AND ORGANOSILOXANE HAVING THE GENERAL FORMULA R''2SIO WHEREIN R'' IS A MONOVALENT HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF METHYL AND PHENYL AND AT LEAST 90 PERCENT OF THE TOTAL NUMBER OR R'' RADICALS ARE METHYL. TUBE, AND D. CURING UP TO 4 HOURS AT TEMPERATURES RANGIAG UP TO 200* F., WHEREBY THE FIRST AND SECOND LINEARS AND THE PROPELLANT GRAIN TOGETHER ARE FIRMLY BONDED TO THE INSIDE OF THE C. CASTING A COMPOSITE PROPELLANT COMPOSITION INTO SAID MOTOR TUBE.
Claim 6
Dependent Claim 94 words
A BENZENE SOLUBLE ORGANOSILOXANE OF AT LEAST 1 MILLION CENTISTOKES VISCOSITY AT 25*C., AND ORGANOSILOXANE HAVING THE GENERAL FORMULA R''2SIO WHEREIN R'' IS A MONOVALENT HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF METHYL AND PHENYL AND AT LEAST 90 PERCENT OF THE TOTAL NUMBER OR R'' RADICALS ARE METHYL. TUBE, AND D. CURING UP TO 4 HOURS AT TEMPERATURES RANGIAG UP TO 200* F., WHEREBY THE FIRST AND SECOND LINEARS AND THE PROPELLANT GRAIN TOGETHER ARE FIRMLY BONDED TO THE INSIDE OF THE C. CASTING A COMPOSITE PROPELLANT COMPOSITION INTO SAID MOTOR TUBE.
Claim 7
Dependent Claim 95 words
a benzene soluble organosiloxane of at least 1 million centistokes viscosity at 25* C., said organosiloxane having the general formula R''2SiO wherein R'' is a monovalent hydrocarbon radical selected from the group consisting of methyl and phenyl and at least 90 percent of the total number of R'' radicals are methyl. c. casting a composite propellant composition into said tube, and d. curing up to 4 hours at temperatures ranging up to 200* F.; whereby the first and second liners and the propellant grain together are firmly bonded to the inside of the motor tube.
Claim 8
Dependent Claim 95 words
a benzene soluble organosiloxane of at least 1 million centistokes viscosity at 25* C., said organosiloxane having the general formula R''2SiO wherein R'' is a monovalent hydrocarbon radical selected from the group consisting of methyl and phenyl and at least 90 percent of the total number of R'' radicals are methyl. c. casting a composite propellant composition into said tube, and d. curing up to 4 hours at temperatures ranging up to 200* F.; whereby the first and second liners and the propellant grain together are firmly bonded to the inside of the motor tube.

References Cited (Backward Citations)

US3027597A Cited
US2877504A Cited
US3032975A Cited
US2957309A Cited
US3030249A Cited
US3032438A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-05-21 1976-11-20 1977-05-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-05-21 1980-11-20 1981-05-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-05-21 1984-11-20 1985-05-22 $7700.00 Window Closed / Lapsed

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