Method for making laminate
A method of insert molding comprises placing in a first mold a curable rubber composition comprising a reactive species; placing on a surface of the rubber composition a first thermoplastic material in a film or layer comprising a group reactive with the reactive species of the rubber composition; curing the rubber composition in the mold to form a first molded article of cured rubber having a first thermoplastic material layer covalently bonded through reactive of the reactive species and the group; placing the first molded article as an insert into a second mold, the cured rubber contacting an inside surface of the second mold and the thermoplastic layer facing into the second mold cavity; closing the second mold and injecting into the second mold a second thermoplastic material that to form a second molded article comprising the first molded article thermally welded and/or covalently bonded to the second thermoplastic material.
1. A method of preparing a molded article, comprising:
placing in a first mold a curable rubber composition;
placing on a surface of the rubber composition a layer comprising a first thermoplastic material with unsaturated carbon-carbon bonds;
curing the rubber composition in the first mold to form a first molded article with the first thermoplastic material covalently bound to the cured rubber composition;
placing the first molded article into a second mold, the layer facing an inside cavity of the second mold;
closing the second mold and injecting into the second mold a second thermoplastic material to form a second molded article with the first thermoplastic material thermally bound to the second thermoplastic material.
2. A method according to claim 1 , wherein the first thermoplastic material is selected from the group consisting of unsaturated polyurethanes, SBS block copolymers, polyesters of unsaturated dicarboxylic acids and anhydrides, acrylated polymers, and methacrylated polymers.
3. A method according to claim 1 , wherein the first thermoplastic material comprises a coupling agent selected from the group consisting of silane coupling agents, zirconate coupling agents, and titanate coupling agents, wherein the coupling agent covalently bonds with the second thermoplastic material.
4. A method according to claim 1 , wherein the first thermoplastic material comprises a thermoplastic elastomer.
5. A method according to claim 1 , wherein the first thermoplastic material comprises a member selected from the group consisting of styrene-butadiene-styrene block copolymers, styrene-ethylene butylene-styrene block copolymers, unsaturated polyurethanes, and combinations thereof.
6. A method according to claim 1 , wherein the first thermoplastic material comprises an unsaturated polyurethane.
7. A method according to claim 1 , wherein the rubber composition comprises a free radical initiator.
8. A method according to claim 1 , wherein the first thermoplastic material comprises a member selected from the group consisting of isocyanate, carboxyl, ester, and amide groups.
9. A method according to claim 1 , wherein the a rubber is prepared from isoprene, butadiene, acrylamide, or nitrile.
10. A method according to claim 1 , wherein the curable rubber composition is die cut from a sheet.
11. A method according to claim 1 , wherein the curable rubber composition and the first thermoplastic material are each formed into a sheet, said sheets placed adjacent one another and together die cut into a desired pre-form shape before being placed in the first mold.
12. A method according to claim 1 , wherein the second thermoplastic material comprises a member selected from the group consisting of polyurethanes, polyamides, polyether-polyamide copolymers, ethylene-vinyl alcohol copolymers, SEBS, SBS, PEEK, ABS, poly(ester-imide) copolymers, polyesters, ester-ether block copolymers, and combinations thereof.
13. A method according to claim 1 , wherein the first thermoplastic material and the second thermoplastic material both comprise an elastomer.