Process for providing a Metallic Coating on Shaped Elements of Thermoplastic Plastics Materials

摘要

1,196,231. Metallizing of polymers. DYNAMIT NOBEL A.G. July 24, 1968 [July 25, 1967], No. 35421/68. Addition to 1, 196, 010. Headings C7B and C7F. A thermoplastic copolymer of vinyl chloride and a copolymeriscible comonomer containing a long chain alkyl radical is sensitized with stamous chloride, activated with silver nitrate, coated with a metal such as Cu and/or Ni and or Ag by electroless disposition and finally coated electrolytically with a metal such as Cu, Ag, Au, Ni, Cr. The comonomer may be one of the following: - a) a vinyl ester CH 2 = CH-OOC-R b) a vinyl ether CH 2 = CH-O-R c) an itaconic acid ester CH 2 -COOR 1 | CH-COOR 2 # CH 2 d) an acrylic acid ester CH 2 = CH-COOR e) a methacrylic acid ester CH 2 = C-OOR | CH3 f) an allyl ester CH 2 = CH-CH 2 -OOC-R where R, R 1 or R 2 is a long chain aliphatic radical usually containing 7-20 C. atoms. The copolymers preferably 4-20% by weight of the comonomers and are prepared by conventional emulsion, suspension or bulk polymerisation. The copolymer e.g. as a sheet is sterilised with a Ba -Cd stabiliser, degreased in 40% NaOH, pickled with chromosulphuric acid, neutralised with 20% NaHSO 3 , sensitized with SnCl 2 and actuated with AgNO 3 . Electroless deposition of Cu, Ni, Ag is then effected from a solution of the salts with a reducing agent Cu is deposited electrolytically from a solution of CusO 4 at 0À5 salts.