Laminate and 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 comprising a group reactive with a reactive species of the rubber composition;
curing the rubber composition in the first mold to form a first molded article, wherein the group of the first thermoplastic material reacts with the reactive species of the rubber composition;
placing the first molded article into a second mold, the layer facing an inside cavity of the second mold;
molding a second thermoplastic material in the second mold to form a second molded article comprising the second thermoplastic material and the first molded article.
2. A method according to claim 1 , wherein the reactive species in the rubber composition is a peroxide or sulfur curing agent and the group of the first thermoplastic material reactive with the reactive species is a member selected from the group consisting of ethylenic unsaturation, carbonyl groups, urethane groups, urea groups, thiocarbonyl groups, cyano groups, strained ring groups, reactive alpha hydrogens, abstractable hydrogens, and combinations thereof.
3. A method according to claim 2 , wherein the reactive species is provided by an arylated methylene group of a polyurethane, by a polyester, or by a polyester segment in a polyurethane.
4. A method according to claim 2 , 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, methacrylated polymers, and polyurethanes.
5. 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.
6. A method according to claim 5 , wherein the coupling agent covalently bonds with the second thermoplastic material.
7. A method according to claim 1 , wherein the first thermoplastic material comprises a thermoplastic elastomer.
8. A method according to claim 1 , wherein the first thermoplastic material comprises a styrene-butadiene-styrene block copolymer or unsaturated polyurethane.
9. A method according to claim 1 , wherein the first thermoplastic material comprises an unsaturated polyurethane.
10. A method according to claim 1 , wherein the group of the first thermoplastic material reactive with the reactive species of the rubber composition is a member selected from the group consisting of ethylenic unsaturation, carbonyl groups, urethane groups, urea groups, thiocarbonyl groups, cyano groups, strained ring groups, reactive alpha hydrogens, abstractable hydrogens, and combinations thereof.
11. A method according to claim 1 , wherein the reactive species in the rubber composition is free radical initiator and the group of the first thermoplastic material reactive with the reactive species is a member selected from the group consisting of isocyanate, carboxyl, ester, unsaturated carbon-carbon bond, and amide groups.
12. A method according to claim 1 , wherein the curable rubber composition is die cut from a sheet.
13. 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.
14. A method according to claim 1 , wherein the first thermoplastic material and the second thermoplastic material both comprises an elastomer.