Patent ID: 7569173

Claim:
A method for preparing a composition selected from the group consisting of polymer compositions, copolymer compositions and polymer-copolymer compositions from at least two different compounds selected from polymers and copolymers, whereby said compounds have each a melting point, in which said at least two compounds are mixed in a melted state, so as to form a melted mixture of said at least two compounds, in which said melted mixture of said at least two compounds is flowing through a structure and contacted for a contact time with said structure, wherein said structure is formed by a bed of beads selected from the group consisting of at least partly piezoelectric beads, at least partly electrostrictive beads, at least partly magnetostrictive beads, and combinations thereof, said structure presenting passages for the flow of the melted mixture, whereby said passages have a cross section of less than 2 mm 2 , and in which, for at least a portion of said contact time of the melted mixture with said structure, the structure is submitted simultaneously to (a) a first field selected from the group consisting of static electrical field higher than 0.5 megavolts/meter, static magnetic field higher than 0.5 Tesla and combinations thereof, and (b) a second field selected from the group consisting of pulsed electrical field higher than 0.5 megavolts/meter, pulsed magnetic field higher than 0.5 Tesla and combinations thereof during a period of time at least sufficient for improving at least one characteristic selected from the group consisting of Young modulus, waterproof, gas proof, liquid proof, release rate, impact resistance, aging, and combinations thereof.