Process for connecting shaped structures containing polytetrafluoroethylene
AssigneeHoechst Aktiengesellschaft
InventorsHerbert Fitz, Franz Mayer
Life of this patent
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Abstract
Shaped structures containing polytetrafluoroethylene are connected with themselves or with another material stable up to 400.degree.C under elevated pressure and temperature using as interlayer between the surfaces to be connected at least one copolymer of tetrafluoroethylene and perfluoroalkyl-perfluorovinyl units in a determined proportion. The composites obtained have a high mechanic strength and the joint has good temperature endurance properties.
Claims6
A process for connecting shaped structures containing polytetrafluoroethylene with themselves or with another material stable at a temperature of up to 400.degree.C, which comprises placing between the structures to be connected an interlayer consisting of at least one copolymer of from 90 to 99.5 % by weight of tetra-fluoroethylene and 0.5 to 10 % by weight of a perfluoroalykl-perfluorovinyl ether of the formula CF.sub.2 = CF--OR in which R represents a perfluoroalkyl chain having from 1 to 10 carbon atoms and compressing the composite structure under a pressure of from 0.1 to 20 kg/cm.sup.2 at a temperature of from 320.degree. to 400.degree.C.
A composite structure consisting of shaped structures containing polytetrafluoroethylene connected with themselves or another material stable at a temperature of up to 400.degree.C and an interlayer of at least one copolymer of from 90 to 99.5 % by weight of tetrafluoroethylene and 0.5 to 10 % weight of a perfluoro-alkyl-perfluorovinyl ether of the formula CF.sub.2 = CF-- OR wherein R represents a perfluoroalkyl chain having from 1 to 10 carbon atoms, said composite structure being compressed at 320.degree. to 400.degree.C under a pressure of from 0.1 to 20 kg/cm.sup.2.
Dependencies are inferred from the claim text.