Multilayer polymer structure

Multilayer polymer structure

  • CN 104,768,757 B
  • Filed: 04/03/2013
  • Issued: 06/19/2020
  • Est. Priority Date: 04/13/2012
  • Status: Active Grant
First Claim
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1. A coextruded rigid multilayer thermoformed structure in which all the layers are coextruded together, the structure comprising:

  • a) at least one substrate layer of a thermoplastic polyolefin,b) at least one styrene-based polymer capstock layer having a thickness of 0.075 to 2.5mm, wherein the styrene-based polymer is selected from the group consisting of;

    polystyrene, High Impact Polystyrene (HIPS), acrylonitrile-butadiene-styrene (ABS) copolymers, acrylonitrile-styrene-acrylate (ASA) copolymers, Styrene Acrylonitrile (SAN) copolymers, methacrylate-acrylonitrile-butadiene-styrene (MABS) copolymers, styrene-butadiene copolymers (SB), styrene-butadiene-Styrene Block (SBS) copolymers and partially or fully hydrogenated derivatives of the SBS copolymers, styrene-isoprene-styrene (SIS) block copolymers and partially or fully hydrogenated derivatives of the SIS block copolymers, and styrene-methyl methacrylate copolymers (S/MMA), andc) at least one tie layer having a thickness of 0.05 to 1mm, the tie layer comprising one or more homogeneous or heterogeneous polymers selected from the group consisting of;

    olefinic acrylate copolymers, copolymers of olefins with (meth) acrylic acid partly or wholly in salt form,wherein said tie layer is directly adjacent and between the thermoplastic polyolefin base layer and the styrene-based polymer capstock layer, wherein said tie layer has a tensile modulus greater than 300 pounds per square inch as determined by ASTM D638.

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