# US 2018/0022882 A1 · Resin molded body and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022882 A1 - Document ID: US20180022882A1 - Status: Published application - Kind: A1 - Application number: 15/552,338 - Filed: 2016-03-14 - Published: 2018-01-25 - Earliest claimed: 2015-03-26 - Assignees: Rimtec Corporation - Applicants: Rimtec Corporation - Inventors: Nobuto Kamei - Web page: https://patentgrep.com/patent/US20180022882A1 ## CPC - C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50) - B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} - B32B 27/34: comprising polyamides - C08J 5/00: Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) - C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)} - B29K 2023/38: {Polymers of cycloalkenes, e.g. norbornene or cyclopentene} - C08J 2365/00: Characterised by the use of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08J2307/00 - C08J2357/00, C08J2361/00 take precedence); Derivatives of such polymers - C08J 2479/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract A resin molded article wherein a surface of a norbornene-based crosslinked polymer comprising at least one member selected from the group consisting of dicyclopentadiene-based monomer units, tetracyclododecene-based monomer units, and tricyclopentadiene-based monomer units in an amount of 50% by mass or more is coated with a polyamide-imide layer, and a method for producing the same. Since the resin molded article of the present invention has highly excellent heat resistance and durability, the resin molded article can be suitably used in applications that require heat resistance such as engine cover applications for automobiles and the like, and electric insulation applications. ## Claims ### Claim 1 A resin molded article wherein a surface of a norbornene-based crosslinked polymer comprising at least one member selected from the group consisting of dicyclopentadiene-based monomer units, tetracyclododecene-based monomer units, and tricyclopentadiene-based monomer units in an amount of 50% by mass or more is coated with a polyamide-imide layer. ### Claim 2 (depends on 1) The resin molded article according to claim 1, wherein the norbornene-based crosslinked polymer has a glass transition temperature of 240° C. or higher. ### Claim 3 (depends on 1) The resin molded article according to claim 1, wherein the norbornene-based crosslinked polymer comprises tricyclopentadiene-based monomer units in an amount of 50% by mass or more. ### Claim 4 (depends on 1) A method for producing a resin molded article as defined in claim 1, comprising step (1) heating a blend comprising at least one member selected from the group consisting of dicyclopentadiene-based monomers, tetracyclododecene-based monomers, and tricyclopentadiene-based monomers, and a metathesis polymerization catalyst to carry out a polymerization curing; and step (2) forming a polyamide-imide layer on a surface of the norbornene-based crosslinked polymer obtained in the step (1). ### Claim 5 (depends on 4) The method for producing a resin molded article according to claim 4, wherein the polymerization curing of the blend in the step (1) comprises: step (i): heating the blend to a temperature lower than a deactivation temperature of the metathesis polymerization catalyst to carry out a primary curing; and step (ii): heating a cured product obtained in the step (i) to a temperature equal to or higher than a deactivation temperature of the metathesis polymerization catalyst to carry out a secondary curing. ### Claim 6 (depends on 4) The method according to claim 4, wherein the tricyclopentadiene-based monomers are contained in an amount of 50% by mass or more of the entire monomers contained in said blend. ### Claim 7 (depends on 5) The method according to claim 5, wherein, in said step (i), said blend is heated to a temperature of 25° C. or higher and lower than 220° C. to carry out a primary curing. ### Claim 8 (depends on 5) The method according to claim 5, wherein, in said step (ii), said cured product is heated to a temperature of 250° C. or higher and lower than 350° C. to carry out a secondary curing. ### Claim 9 (depends on 2) The resin molded article according to claim 2, wherein the norbornene-based crosslinked polymer comprises tricyclopentadiene-based monomer units in an amount of 50% by mass or more. ### Claim 10 (depends on 2) A method for producing a resin molded article as defined in claim 2, comprising step (1) heating a blend comprising at least one member selected from the group consisting of dicyclopentadiene-based monomers, tetracyclododecene-based monomers, and tricyclopentadiene-based monomers, and a metathesis polymerization catalyst to carry out a polymerization curing; and step (2) forming a polyamide-imide layer on a surface of the norbornene-based crosslinked polymer obtained in the step (1). ### Claim 11 (depends on 3) A method for producing a resin molded article as defined in claim 3, comprising step (1) heating a blend comprising at least one member selected from the group consisting of dicyclopentadiene-based monomers, tetracyclododecene-based monomers, and tricyclopentadiene-based monomers, and a metathesis polymerization catalyst to carry out a polymerization curing; and step (2) forming a polyamide-imide layer on a surface of the norbornene-based crosslinked polymer obtained in the step (1). ### Claim 12 (depends on 5) The method according to claim 5, wherein the tricyclopentadiene-based monomers are contained in an amount of 50% by mass or more of the entire monomers contained in said blend. ### Claim 13 (depends on 6) The method according to claim 6, wherein, in said step (i), said blend is heated to a temperature of 25° C. or higher and lower than 220° C. to carry out a primary curing. ### Claim 14 (depends on 6) The method according to claim 6, wherein, in said step (ii), said cured product is heated to a temperature of 250° C. or higher and lower than 350° C. to carry out a secondary curing. ### Claim 15 (depends on 7) The method according to claim 7, wherein, in said step (ii), said cured product is heated to a temperature of 250° C. or higher and lower than 350° C. to carry out a secondary curing. ### Claim 16 (depends on 10) The method for producing a resin molded article according to claim 10, wherein the polymerization curing of the blend in the step (1) comprises: step (i): heating the blend to a temperature lower than a deactivation temperature of the metathesis polymerization catalyst to carry out a primary curing; and step (ii): heating a cured product obtained in the step (i) to a temperature equal to or higher than a deactivation temperature of the metathesis polymerization catalyst to carry out a secondary curing. ### Claim 17 (depends on 11) The method for producing a resin molded article according to claim 11, wherein the polymerization curing of the blend in the step (1) comprises: step (i): heating the blend to a temperature lower than a deactivation temperature of the metathesis polymerization catalyst to carry out a primary curing; and step (ii): heating a cured product obtained in the step (i) to a temperature equal to or higher than a deactivation temperature of the metathesis polymerization catalyst to carry out a secondary curing.