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OwnerPhilippe Cassagnau, Alain Michelinventors
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The invention concerns a micro-composite polymer/polymer material comprising 25 to 35 wt. % of a semicrystalline polymer (I), forming a dispersed phase localised inside a thermoplastic or elastomeric polymer (II) forming a matrix, the temperature of crystallisation of the polymer forming a dispersed phase being higher by at least 20° C. than the melting or softening point of polymer (II) forming the matrix, and the dispersed phase of said material having specifically a morphology such that it induces crosslinking of the continuous phase. The invention also concerns a method for obtaining said material comprising steps which consist in: extruding, at regulated temperature, said mixture of melted polymers, said regulation temperature being decreasing from the feeding zone (A) to the die zone (F) of said extruding machine (1) so that the temperature of the material in said die zone (F) is lower than the temperature of recrystallisation or solidification of polymer (I) and higher than the melting or softening point of polymer (II); and cooling at room temperature the resulting micro-composite material.
A polymer/polymer microcomposite material comprising from 25 to 35% by weight of a semicrystalline polymer (I) forming a dispersed phase localized within a matrix-forming elastomer or thermoplastic polymer (II), the crystallization temperature of the dispersed-phase-forming polymer (I) being at least 20° C. above the melting point or softening temperature of the matrix-forming polymer (II) and the dispersed phase of said material possessing a morphology such that it induces physical crosslinking of the continuous phase.
The material as claimed in any one of the preceding claims, characterized in that the dispersed phase has a coral-type morphology.
The material as claimed in any one of the preceding claims, characterized in that the dispersed phase is in the form of discontinuous microstructures of polymer (I) having an average size of between 1 and 5 μm.
The material as claimed in any one of the preceding claims, characterized in that the matrix-forming polymer is chosen from vinyl acetate and acrylic ester polymers or copolymers.
The material as claimed in claim 15, characterized in that the matrix-forming polymer is chosen from ethylene/vinyl acetate or ethylene/acrylic ester polymers or copolymers.
Dependencies are inferred from the claim text.