Carboxy-terminated copolymers of isoprene and vinyl ferrocene

• US 3,886,191 A
• Filed: 07/08/1970
• Issued: 05/27/1975
• Est. Priority Date: 07/08/1970
• Status: Expired due to Term

• Current Assignee: Samuel F. Reed Jr
• Original Assignee: Samuel F. Reed Jr
• Inventors: Reed, Samuel F. Jr.
• Primary Examiner(s): Padgett, Benjamin R.
• Assistant Examiner(s): Miller, E. A.
• Application Number:
  US05/056,015
• Time in Patent Office: 1,784 Days
• Field of Search: 260/82.1,439CY
• US Class Current: 556/144
• CPC Class Codes: C06B 45/105 The resin being a polymer bearing energetic groups or containing a soluble organic explosive
• CPC Class Codes: C08F 236/08 Isoprene
• CPC Class Codes: C08F 236/22 the radical having three or more carbon-to-carbon double bonds
• CPC Class Codes: C08F 4/04 Azo-compounds

Abstract

Copolymers of vinyl ferrocene (VF) and isoprene are disclosed along with preparative procedures therefor. The copolymers are produced in an organic solvent when polymerization is initiated by a carboxy-containing azo compound, such as, 4,4'"'"''"'"'-azobis(4cyanovaleric acid), thereby forming a copolymer of vinyl ferrocene and isoprene. The copolymers are useful in propellant formulations as a binder where high burning rates are desired.

Claims

1. THE CARBOXY TERMINATED-COPOLYMERS OF ISOPRENE AND VINYL FERROCENE PREPARED BY THE METHOD COMPRISING REACTING VINYL FERROCENE AND A SUITABLE POLYMERIZATION INITATOR IN AN INERT ORGANIC SOLVENT WITH ISOPRENE AT A REACTION TEMPERATURE AND FOR A REACTION TIME PERIOD SUFFICIENT FOR SAID REACTION TO TAKE PLACE AFTER WHICH SOLVENT REMOVAL IS EFFECTED AND SAID COPOLYMERS ARE DRIED AT A SUITABLE DRYING TEMPERATURE WHILE UNDER REDUCED PRESSURE;

SAID SUITABLE POLYMERIZATION INITATOR BEING 4,4'"'"''"'"'-AZOBIS(4-CYANOVALERIC ACID);

SAID INERT ORGANIC SOLVENT BEING SELECTED FROM DIOXANE AND TOLUENE;

SAID REACTION TEMPERATURE BEING IN THE RANGE OF ABOUT 60*C TO ABOUT 80*C;

SAID REACTION TIME BEING FROM ABOUT 24 HOURS TO ABOUT 120 HOURS;

SAID DRYING IS ACCOMPLISHED AT A SUITABLE TEMPERATURE IN THE RANGE OF ABOUT 70*C TO ABOUT 75*C AND SAID REDUCED PRESSURE IS IN THE RANGE OF ABOUT 1 MILLIMETER;

SAID REACTING ISOPRENE AND VINYL FERROCENE IN MOLE RATIOS FROM APPROXIMATELY 100;

1 TO 1;

1 TO FORM SAID COPOLYMERS CHARACTERIZED BY A MOLECULAR WEIGHT IN THE RANGE FROM ABOUT 1000 TO ABOUT 10,000, CARBOXY-END GROUP CONTENT OF ABOUT 0.5 WEIGHT PERCENT TO ABOUT 9 WEIGHT PERCENT, AND AN IRON CONTENET OF ABOUT 0.5 WEIGHT PERCENT TO ABOUT 15 WEIGHT PERCENT.