(19)
(11)EP 0 247 657 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
12.07.1989 Bulletin 1989/28

(43)Date of publication A2:
02.12.1987 Bulletin 1987/49

(21)Application number: 87200816.4

(22)Date of filing:  28.04.1987
(51)International Patent Classification (IPC)4B29C 51/14
(84)Designated Contracting States:
BE DE ES FR GB IT NL SE

(30)Priority: 16.05.1986 US 863754

(71)Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
NL-2596 HR Den Haag (NL)

(72)Inventor:
  • Coffman, Paul Mahoney
    Houston Texas 77077 (US)


(56)References cited: : 
  
      


    (54)Production of multilayer containers


    (57) A process for making multilayer containers, which comprises the steps of:

    a) producing multilayer billets comprising at least one layer of a barrier polymer;

    b) producing monolayer sheet of polypropylene;

    c) heating said monolayer sheet and said billets to a temperature where the mating surfaces of both said sheet and said billets are at or above the fusion temperature of said mating surfaces;

    d) placing said billets on said sheet, while maintaining said billets and said sheet at or above the mating surface fusion temperature so that said billets and said sheet are welded together; and

    e) forming containers from said welded billets and sheet, leaving a web of monolayer polypropylene sheet and reprocessing this web into either production of billets or monolayer sheet.







    Search report