Manufacturing process of rubber layered structure
First Claim
1. A method of forming a rubber layered structure having a EPDM rubber base layer and a laminated film layer, comprising the steps of:
- (a) preparing a laminated film comprising a first film layer of a non-polar olefin resin modified by the introduction of maleic arthydride to form a modified olefin resin, said modified olefin resin being directly bondable to the EPDM rubber base layer, and a second film layer of a polar thermoplastic resin directly attached to said modified olefin resin first film layer;
(b) extrusion-forming said EPDM rubber base layer;
(c) vulcanizing said EPDM rubber base layer; and
(d) attaching and roller pressing said non-polar olefin first film layer onto said EPDM rubber base layer by melting and re-solidifying at least surface of said non-polar olefin first film layer with heat from said EPDM rubber base layer remaining from said vulcanizing step.
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Abstract
A rubber layered structure used for a weather strip or a glass run, which includes an EPDM rubber base and an ornamental surface layer or a functional surface layer for enhancing slidability of a door glass. An ornamental or functional surface layer is stuck to an EPDM rubber base with a laminated film. The laminated film includes a first layer of an olefin resin with polar functional groups and a second layer of a polar thermoplastic resin. The first layer, which includes a non-polar olefin resin and polar functional groups, adheres to both the EPDM rubber base and the second layer of a polar resin such as polyester. The second layer securely adheres to the surface layer.
21 Citations
7 Claims
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1. A method of forming a rubber layered structure having a EPDM rubber base layer and a laminated film layer, comprising the steps of:
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(a) preparing a laminated film comprising a first film layer of a non-polar olefin resin modified by the introduction of maleic arthydride to form a modified olefin resin, said modified olefin resin being directly bondable to the EPDM rubber base layer, and a second film layer of a polar thermoplastic resin directly attached to said modified olefin resin first film layer; (b) extrusion-forming said EPDM rubber base layer; (c) vulcanizing said EPDM rubber base layer; and (d) attaching and roller pressing said non-polar olefin first film layer onto said EPDM rubber base layer by melting and re-solidifying at least surface of said non-polar olefin first film layer with heat from said EPDM rubber base layer remaining from said vulcanizing step. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification