Disclosed is a multilayer structure useful for preparing highly abrasion-resistant protective liners, including tubular articles such as multilayer tubes or pipes.
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1. A thermoplastic multilayer structure in the form of a tubular article or pipe liner comprising at least three layers, (a) a first surface layer having a thickness of about 6.3 to about 51 mm comprising a soft thermoplastic composition consisting of an ionomer of an ethylene acid terpolymer compri
1. A thermoplastic multilayer structure in the form of a tubular article or pipe liner comprising at least three layers, (a) a first surface layer having a thickness of about 6.3 to about 51 mm comprising a soft thermoplastic composition consisting of an ionomer of an ethylene acid terpolymer comprising an E/X/Y copolymer wherein E represents copolymerized units of ethylene, X is present in an amount of about 2 to about 30 weight % of the E/X/Y polymer and represents copolymerized units of a C3-8 α,β-ethylenically unsaturated carboxylic acid and Y is present in from 3 to 45 weight % of the E/X/Y copolymer and represents copolymerized units of a softening comonomer selected from alkyl acrylate, alkyl methacrylate, wherein the alkyl groups have from 1 to 8 carbon atoms, or vinyl acetate, wherein about 40 to about 75% of the carboxylic acid groups in the copolymer are neutralized to salts wherein the cations consist of zinc cations with melting point in a range from about 60 to about 220 ° C., with flexural modulus determined at 21 ° C. according to ASTM D790 of less than or equal to 90 MPa and Shore D hardness (ASTM D2240) from about 30 to about 50;(b) a second surface layer comprising a thermoplastic polymer composition containing acid functionality, an ionomer thereof, or anhydride functionality with flexural modulus determined at 21 ° C. according to ASTM D790 of less than 100 MPa and melting point in a range from about 60 to about 100 ° C., wherein the composition comprises(1) a polyolefin graft copolymer comprising a trunk polymer comprising polyethylene, polypropylene, styrene-ethylene-butene-styrene triblock copolymer, polybutadiene or a copolymer comprising copolymerized units of ethylene and copolymerized units of vinyl acetate, alkyl acrylate or alkyl methacrylate; wherein the alkyl groups have from 1 to 8 carbon atoms, wherein the trunk polymer is modified by grafting thereto a cyclic anhydride of C4-C8 unsaturated acids; or(2) an ethylene dicarboxylic random copolymer comprising copolymerized units of ethylene and copolymerized units of a dicarboxylic comonomer selected from the group consisting of cyclic anhydrides of C4-C8 unsaturated acids monoesters of C4-C8 unsaturated acids having at least two carboxylic acid rows diesters of C4-C8 unsaturated acids having at least two carboxylic acid groups, and mixtures thereof, wherein the ethylene dicarboxylic copolymer comprises from about 0.3 to about 20 weight % copolymerized units of dicarboxylic comonomer, based on the weight of the random copolymer; or(3) an ethylene acid terpolymer comprising an E/X/Y copolymer wherein E represents copolymerized units of ethylene, X is present in an amount of about 2 to about 30 weight % of the E/X/Y polymer and represents copolymerized units of a C3-8 α,β-ethylenically unsaturated carboxylic acid, and Y is present in from 3 to 45 weight % of the E/X/Y copolymer and represents copolymerized units of a softening comonomer selected from alkyl acrylate, alkyl methacrylate, wherein the alkyl groups have from 1 to 8 carbon atoms, or vinyl acetate; or an ionomer thereof wherein about 40 to about 75% of the carboxylic acid groups in the terpolymer are neutralized to salts wherein the cations consist of zinc cations; or(4) an ethylene acid E/Z dipolymer wherein E represents copolymerized units of ethylene, and Z is present in an amount of about 10 to about 25 weight % of the E/Z diolymer and represents cool merized units of a C3-8 α,β-ethylenically unsaturated carboxylic acid; and(c) at least one interior layer of a material selected from the group consisting of thermoplastic resin, fiber reinforcement, and metal and combinations thereof, wherein the thermoplastic resin comprises a composition with flexural modulus determined at 21 ° C. according to ASTM D790 of greater than 80 MPa, melting point in a range from about 75 to about 150 ° C., and moisture vapor permeation value less than 2 g-mil/100in2-day; wherein the thermoplastic resin comprises(i) an ionomer of an E/W ethylene acid dipolymer wherein E represents copolymerized units of ethylene, W is present in an amount of about 2 to about 30 weight % of the E/W polymer and represents copolymerized units of a C3-8 α,β-ethylenically unsaturated carboxylic acid, wherein about 40 to about 75% of the carboxylic acid groups in the dipolymer are neutralized to salts wherein the cations consist of zinc cations; or(ii) a polyethylene homopolymer, polyethylene copolymer, polypropylene homopolymer or polypropylene copolymer,wherein the second surface layer is adhered to the interior of a metal pipe having a thickness of about 6.3 to about 51 mm. 2. The multilayer structure of claim 1 wherein the interior layer comprises the ionomer of the E/W ethylene acid dipolymer. 3. The multilayer structure of claim 2 wherein the second surface layer comprises the ionomer of an ethylene acid terpolymer. 4. The multilayer structure of claim 1 wherein the interior layer consists of a polyethylene homopolymer, polyethylene copolymer, polypropylene homopolymer or polypropylene copolymer. 5. The multilayer structure of claim 4 comprising, in order, the first surface layer comprising the ionomer of the ethylene acid terpolymer, a first tie layer, the interior layer consisting of high density polyethylene or polypropylene, a second tie layer and the second surface layer comprising the ionomer of an ethylene acid terpolymer. 6. The multilayer structure of claim 1, wherein the C3-8 α,β-ethylenically unsaturated carboxylic acid is acrylic acid or methacrylic acid. 7. The multilayer structure of claim 6 wherein X is methacrylic acid, present in an amount from 5 to 20 weight % of the E/X/Y copolymer and Y is butyl acrylate, present in an amount from 10 to 30 weight % of the E/X/Y copolymer. 8. The multilayer structure of claim 1 wherein the second surface layer comprises (1). 9. The multilayer structure of claim 1 wherein the second surface layer comprises (3). 10. The multilayer structure of claim 9 wherein X is methacrylic acid, present in an amount from 5 to 20 weight % of the E/X/Y terpolymer and Y is butyl acrylate, present in an amount from 10 to 30 weight % of the E/X/Y copolymer. 11. The multilayer structure of claim 9 wherein (3) is the E/X/Y terpolymer. 12. The multilayer structure of claim 11 wherein X is methacrylic acid, present in an amount from 5 to 20 weight % of the E/X/Y terpolymer and Y is butyl acrylate, present in an amount from 10 to 30 weight % of the E/X/Y copolymer. 13. The multilayer structure of claim 1 wherein (3) is the ionomer of the E/X/Y terpolymer.
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이 특허에 인용된 특허 (20)
Abelson Paul N. (Lewiston NY) Buell Halsey W. (Niagara Falls NY) Hallatt William E. (Lewiston NY), Abrasion resistant coated abrasive pipe lining sheet.
Phelps Edwin H. (Birmingham AL) Snow William E. (Birmingham AL), Method of forming a filled polymer coating on an internal cylindrical surface and article produced thereby.
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