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Multilayer polymeric structures
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A technology of polymer and multi-layer compounding, which is applied in the direction of lamination, layered products, lamination devices, etc., and can solve problems such as failure to realize
Inactive Publication Date: 2020-09-11
TRINSEO EURO GMBH
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[0011] Thus, there is a long-felt desire to achieve multilayer composite structures that combine the weather resistance of acrylics, styrenes, and acrylonitriles with the strength and toughness of polyester or polycarbonate, and methods for making such structures. unfulfilled needs
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[0083] Four Arkema acrylic products ( A200, P600, H 300 and Plexiglas TM V920) were compression molded with PET polyester resin [DuraPET from PolyVisions] in a 6 inch by 6 inch Carver press. After experimenting with various processing conditions to optimize the adhesion between the two different polymer layers, a two-step process was determined to achieve the best adhesion between the polyester and the acrylic resin, where first at higher temperature The polyester layer was prepared, and the acrylic layer was molded on top. Surprisingly, the best adhesion was obtained by processing the acrylic layer at a temperature about 50°F higher than that typically used with acrylic resins, without significant degradation in the quality of the acrylic layer. The following process produced the best adhesion between the acrylic and polyester layers:
[0084] 1) Form the PET sheet first at 550°F, apply a pressure of 5,000 psi for 1 minute, t...
Embodiment 2
[0096] Example 2 - Lamination of Extruded Sheets
[0097] Extruded PET sheet and laminated with extruded sheet made of acrylic polymer available from Arkema: A200, P600, H300 and T system. Two grades of polyester, both available from PolyVision, were tested: DuraPET 1220 and DuraPET 1220PCR. "PCR" grades are made from recycled resin, but are similar to standard grades.
[0098] T is designed for bonding acrylics to thermoplastic polyolefins (TPO) and consists of an acrylic cap stock layer with an underlying styrenic copolymer tie layer. The tie layer is commercially known as Available from Arkema.
[0099] All composite structures made by lamination had three layers: an inner substrate layer of PET resin and two outer capstock layers of acrylic or acrylic / tie ply systems. In the case of the acrylic tie layer system, the styrenic block copolymer tie layer was in each case oriented adjacent to the PET inner substrate layer.
[0100] A hot roll laminator was used...
Embodiment 3
[0110] Example 3 - Coextrusion
[0111] Two-layer composite samples were fabricated on a standard Davis coextrusion line using a coat hanger die and dual manifolds. A 1.25-inch single-screw extruder was used for the polyester substrate layer (various grades of DuraPET), while a 1-inch single-screw extruder was used for the acrylic cap stock ( A200 or - Impact-modified acrylic resin) layer from Arkema. For each material, the barrel temperature of the two extruders on the coextrusion line was varied to achieve bonding between the polyester substrate layer and the acrylic cap stock layer. Table 2 lists the standard barrel temperature used for each material, and the temperature determined to produce the best adhesion between the layers. The temperature of both layers had to be changed significantly to improve adhesion and extrude a high-quality two-layer composite.
[0112] Surprisingly, not only by increasing the temperature profile of the extruder for the acrylic resin, ...
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Abstract
A multilayer composite structure is disclosed. The multilayer composite structure has at least one polymer-based cap layer containing, for example, an acrylic, styrenic or acrylonitrilepolymer and atleast one polyester-based inner or substrate layer. Also disclosed are methods of forming the multilayer composite structure to improve and control the level of adhesion between the layers. Optionaltie layers can be used to improve and control the level of adhesion between the layers. An optional exterior layer over the cap layer can contain polyvinylidene fluoride (PVDF) polymers. The multilayer composite structure combines the attributes of both polymers - the high UV stability, scratch resistance, and excellent appearance of the polymer-based outer cap layer and the strength and impact resistance of the polyester-based interior layer.
Description
[0001] field of invention [0002] The multilayer polymer composite structure is formed by extrusion, coextrusion, extrusion lamination, multiple injection molding, compression molding, pultrusion, or any other method known in the art. The multilayer composite structure includes at least one polymeric cap layer comprising an acrylic or styrenic or acrylonitrile polymer and at least one polyester inner or substrate layer. Also disclosed are methods of fabricating and forming multilayer composite structures to improve and control the level of interlayer adhesion. Optionally, tie layers can also be used to improve and control the level of interlayer adhesion. An optional exterior layer on the cap layer may comprise polyvinylidene fluoride (PVDF) polymers and blends. The multi-layer composite construction combines the properties of these two polymers - the high UV stability, scratch resistance and excellent appearance of the polymer outer cap layer with the strength and impact res...
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