LOW MOLECULAR TERTIARY COPOLYMERS OF VINYLYDENE FLUORIDE BEING HARDENED AT LOW TEMPERATURE AS BASE FOR THERMAL RESISTANT SEALER AND PROTECTIVE COATINGS AND METHOD FOR THEIR PRODUCTION Russian patent published in 1997 - IPC

FIELD: production of thermal resistant and protective coatings. SUBSTANCE: low molecular weight copolymers of vinylydene fluoride have formula where , l= 15-120, m=3.5-32.5, n=1.7-3.9. A=B= or Br, x=1-3, A is different from B and if A= then B= Br. Desired copolymer is prepared by solution copolymerization of vinylydene fluoride with comonomers of 1,2,2-trifluoro-1,1,2-trichloroethane. The process takes place in the presence of initiator, fluoroalkanoyl peroxide having common formula where x= 1-3 is used as mentioned above initiator. Perfluoroalkyl vinyl ester having ester functional group is used as one of mentioned above comonomers. Said copolymerization takes place at molar ratio of fluoroalkanoyl peroxide and total amount of said monomers (0.0002-0.038):1. Copolymerization may be carried out in the presence of 1,2-dibromotetrafluoroethane, molar ratio of said 1,2-dibromotetrafluoroethane and total amount of comonomers being (0.2-2.2):1. Thus prepared copolymers having molecular weight 2500-15000 are then hardened at room temperature with the help of di- or polyamines. EFFECT: improved quality of desired product, improved efficiency. 4 cl, 1 tbl