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US20160075866A1 - Compositions for capstock applications - Google Patents

Compositions for capstock applications Download PDF

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Publication number
US20160075866A1
US20160075866A1 US14/501,427 US201414501427A US2016075866A1 US 20160075866 A1 US20160075866 A1 US 20160075866A1 US 201414501427 A US201414501427 A US 201414501427A US 2016075866 A1 US2016075866 A1 US 2016075866A1
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US
United States
Prior art keywords
styrene
acrylonitrile copolymer
weight
parts
present
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/501,427
Other languages
English (en)
Inventor
Ali Kahn
Maryellen Cox
Roland Ruprecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teknor Apex Co
Original Assignee
Teknor Apex Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teknor Apex Co filed Critical Teknor Apex Co
Priority to US14/501,427 priority Critical patent/US20160075866A1/en
Assigned to TEKNOR APEX COMPANY reassignment TEKNOR APEX COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COX, MARYELLEN, KAHN, Ali, RUPRECHT, ROLAND
Priority to CA2960808A priority patent/CA2960808C/en
Priority to MX2017003263A priority patent/MX395368B/es
Priority to EP15840766.8A priority patent/EP3191548B1/en
Priority to PCT/US2015/047848 priority patent/WO2016040043A1/en
Priority to CN201580049796.2A priority patent/CN107075245A/zh
Publication of US20160075866A1 publication Critical patent/US20160075866A1/en
Priority to US16/171,991 priority patent/US11059234B2/en
Abandoned legal-status Critical Current

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    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • the present invention relates to a thermoplastic polymer alloy compositions including a blend of polymers that each contribute beneficial properties to the compositions.
  • the compositions exhibit characteristics desirable for outdoor applications such as weatherability, impact resistance and durability, while offering excellent surface appearance.
  • the compositions are particularly suitable for decking applications and as capstock materials.
  • polymers such as polyvinyl chloride (PVC), acrylonitrile/butadiene/styrene (ABS) and high impact polystyrene (HIPS) exhibit desirable structural or mechanical properties when formed into an article of manufacture.
  • PVC polyvinyl chloride
  • ABS acrylonitrile/butadiene/styrene
  • HIPS high impact polystyrene
  • multi-layer compositions have been developed wherein an outer layer or capstock has been bonded to a base material and covers a previously exposed surface in order to provide sought-after performance.
  • Such capstock layers are usually thinner than the base material.
  • capstocks see for example U.S. Pat. Nos. 8,658,716, 8,034,441, 7,651,648, 7,338,706, 6,773,821, 6,696,513, 6,555,245, 6,534,592, 5,318,737; U.S. Publication Nos. 2013/0303644, 2013/0317139, 2012/0128967, 2010/0330272, 2009/0258208, 2008/0293837, 2007/0154689 2007/0092701; and International Application Nos. WO2014/018817.
  • compositions of the present invention which comprise a blend of halogen-containing polymers such as polyvinyl chloride, thermoplastic polyurethane and one or more acrylic polymers.
  • One object of the invention is to provide a composition that can be applied as a capstock material over a layer of a substrate material, often as a relatively thin layer, via melt processing, thereby forming a composite.
  • Still another object of the present invention is to provide compositions that have excellent weatherability, impact resistance, durability, and/or desirable surface appearance.
  • Another object of the present invention is to provide capstock compositions, that are easily processable and readily bondable to a substrate.
  • An additional object of the present invention is to provide compositions, especially capstock compositions, that are mar and scratch resistant and/or flame retardant.
  • a further object of the present invention is to provide compositions that can be coextruded, crosshead extruded, or otherwise bonded to a substrate with good bond strength.
  • FIG. 1 is a cross-sectional view of one embodiment of a composite comprising a capstock material over a layer of a substrate material.
  • compositions of the present invention which are suitable, among other uses as capstock materials, comprise a blend of halogen-containing polymers, a thermoplastic polyurethane, and one or more, and preferably a plurality of different acrylic polymers.
  • the compositions can also include other ingredients or additives, for example as described herein below.
  • polymer encompasses both hompolymers and copolymers of two or more different monomers.
  • the polymer compositions of the invention incorporate a halogen-containing polymer therein.
  • suitable halogen containing polymers include, but are not limited to, polyvinyl chloride, polyvinyl fluoride, polyvinyl bromide, polyvinylidene chloride, chlorinated polyvinyl chloride, polyvinylidene fluoride and polyvinylidene bromide. Chlorine containing vinyl polymers are preferred in one embodiment. Polyvinyl chloride is preferred in various embodiments.
  • Halogen-containing polymers offer the benefit of being inherently flame retardant due to polymer containing relatively high halogen content, such as 57 weight % chlorine in the case of PVC.
  • Various halogen-containing polymers, such as PVC are also polar in nature with the ionic bonds providing good chemical resistance against certain solvents.
  • Halogen-containing polymers are available from many commercial sources under various designations including, but not limited to, Oxyvinyl, as OXY 200, OXY 216S, OXY 500F, and as Oxy 225, Shintech as SE 800A, SE 950A, SE 1100A, Formosa, Formolon 616K, Formolon 622R, and Formolon 622F.
  • the halogen containing polymers can be present in compositions of the invention in amounts which range generally from about 15 to about 60, desirably from about 20 to about 40 and preferably from about 25 to about 35 parts by weight based on 100 total parts by weight of the composition.
  • TPU Thermoplastic Polyurethane
  • Thermoplastic polyurethanes are another polymer present in the blend compositions of the present invention.
  • Polyurethanes are generally prepared by combining and reacting a polyol, generally a polyol component of at least one hydroxyl terminated intermediate such as a hydroxyl terminated polyether, polyester, polycarbonate or polycaprolactone, with a polyisocyanate.
  • Polyamines are sometimes included in the reaction.
  • the reaction can additionally include chain extenders and catalysts.
  • Polyisocyanates include two or more isocyanate groups per molecule.
  • polyols include two or more hydroxyl groups per molecule.
  • thermoplastic polyurethanes used in the invention may be aliphatic or aromatic, or combinations thereof.
  • polyurethanes prepared utilizing polyether polyols are preferred.
  • Polyether TPU grades have the advantage of providing improved hydrolysis resistance, mildew resistance, and anti-microbial properties over polyester TPU resin grades.
  • Thermoplastic Polyurethanes provide the benefit of achieving exceptional abrasion resistance and chemical resistance.
  • Thermoplastic polyurethanes also are known to reduce the modulus of PVC without incorporating plasticizers.
  • Polyurethanes are available from many commercial sources including, but not limited to, A. Shulman, Bayer, BASF, Huntsman, Lubrizol, RTP, and Techmer and COIM under various designations. Suitable TPU grades are from BASF as Elastollan A1154D, Elastollan 1195A, and Elastollan 1190A, Bayer as Texin DP7-3041, Texin DP7-3018, Texin DP7-3006, Texin DP7-3007, Texin DP7-SUN 3006, and from Lubrizol as Estane 58213.
  • the polyurethanes can be present in compositions of the invention in amounts which range generally from about 1 to about 50, desirably from about 1 to about 40 and preferably from about 1 to about 25 parts by weight based on 100 total parts by weight of the composition.
  • compositions of the present invention include at least one and preferably a plurality of different acrylic polymers.
  • acrylic polymers can be utilized including, but not limited to, polyacrylate-styrene-acrylonitrile, styrene-acrylonitrile, cross-linked acrylonitrile and high molecular weight or ultra-high-molecular weight styrene-acrylonitrile copolymer.
  • ASA Polyacrylate-styrene-acrylonitrile
  • compositions of the present invention also include a polyacrylate-styrene-acrylonitrile copolymer.
  • ASA is typically classified as a terpolymer which can be made by various methods as known to those of ordinary skill in the art.
  • ASA can be made by grafting SAN to an acrylate, for example a polybutylacrylate rubber, to form a SAN-soluble polybutylacrylate rubber.
  • acrylates can be utilized, such as alkyl (meth)acrylates having generally from about 1 to about 8 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, or ethylhexyl (meth)acrylate.
  • alkyl (meth)acrylates having generally from about 1 to about 8 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, or ethylhexyl (meth)acrylate.
  • (meth) means that methyl group may be present or absent.
  • Butyl (meth)acrylate is preferred in one embodiment.
  • Styrene in the ASA refers to any vinyl aromatic monomer, including, but not limited to styrene; alkyl styrene, such as alpha-methylstyrene; and ring-alkylated styrenes, for example p-methylstyrene.
  • Acrylonitrile monomers include acrylonitrile and methacrylonitrile.
  • the acrylate content of the ASA ranges generally from about 10 to about 60, desirably from about 30 to about 50 and preferably from about 35 to about 45 parts per 100 parts by weight of the ASA. Further, the ASA typically has a styrene content of from generally about 20 to about 50, desirably from about 25 to about 40 and preferably from about 25 to about 30 parts per 100 parts by weight of the ASA. The ASA has an acrylonitrile content of from generally about 5 to about 35, desirably from about 5 to about 30 and preferably from about 10 to about 20 parts per 100 parts by weight of the ASA.
  • ASA ASA ASA
  • BASF BASF as LURANTM SSE
  • Sabic GeloyTM CR3020
  • Galata Chemicals as Royaltuf® 960A which is stated to include 60 percent polybutylacrylate
  • Royaltuf® 945A which is stated to include 45 percent polybutylacrylate.
  • ASA provide the benefit of offering exceptional weathering and UV resistance particularly of dark colored articles.
  • the ASA can be present in compositions of the invention in amounts which range generally from about 10 to about 50, desirably from about 15 to about 50 and preferably from about 15 to about 35 parts by weight based on 100 total parts by weight of the composition.
  • At least one styrene acrylonitrile copolymer is also present in the compositions of the present invention.
  • SAN is typically classified as a copolymer, which is made by reacting acrylonitrile monomers and styrene monomers, see for example the acrylonitrile and styrene monomers defined hereinabove.
  • SAN provides the benefit of a fusion promoter and process aid for PVC.
  • SAN also provides the ability for dilution with ASA to control the rubber wt % content of the ASA.
  • the compositions include cross-linked SAN.
  • the cross-linked SAN is useful as a matting agent in various embodiments of the invention.
  • the cross-linked SAN is a matting agent and is a mixture of polystyrene and acrylonitrile-styrene copolymer, including a styrene-based matrix and cross-linked acrylonitrile-styrene copolymer wherein the mixture can include polystyrene in an amount of 20-30 weight % and acrylonitrile-styrene copolymer in an amount of about 70-80 weight %.
  • a relatively high molecular weight styrene-acrylonitrile copolymer is utilized in compositions of the present invention.
  • high molecular weight it is meant that the end copolymer has a molecular weight greater than 1 million, desirably greater than 2 million, preferably greater than 3 million weight average as measured by Gel Permeation Chromotography (GPC) using a suitable solvent and compared against Polystyrene standards.
  • GPC Gel Permeation Chromotography
  • the standard grades of SAN include molecular weights below the lowest range of the high molecular weight SAN, i.e. 1 million weight average or less and preferably below 500,000 weight average.
  • High-molecular weight SAN can adjust the melt strength during extrusion.
  • the SAN generally has an acrylonitrile content of preferably from about 10 to about 50 parts by weight based on 100 parts by weight of the SAN. That said, the SAN styrene content ranges preferably from about 50 to about 90 parts by weight based on 100 parts by weight of the SAN.
  • the SAN can be present in compositions of the invention in amounts which range generally from about 10 to about 50, desirably from about 10 to about 40 and preferably from about 10 to 30 parts by weight based on 100 total parts by weight of the composition.
  • the cross-linked SAN can be present in compositions of the invention in amounts which range generally from 0.25 to about 4.0, desirably from about 0.50 to about 2.5, and preferably from about 0.75 to about 2.0 parts by weight based on 100 total parts by weight of the composition.
  • High molecular weight SAN can be present in compositions of the invention in amounts which range generally from about 0.1 to about 20, desirably from about 0.1 to about 10 and preferably from about 0.1 to 8 parts by weight based on 100 total parts by weight of the composition.
  • Suitable grades of SAN are commercially available from sources such Styrolution as LURAN® 358N, LURAN®-VLN, and LURAN®-VLR and Galata Chemicals as Blendex® 869, Blendex® 5215, Blendex® 5233, and Blendex® BMAT.
  • compositions of the present invention include two or more, three or more, four more different grades or types of SAN.
  • the compositions include SAN, cross-linked SAN, and high molecular weight SAN.
  • compositions of the present invention can also include additives, each in a sufficient amount to obtain alone or in combination with other components, a desired property of the composition.
  • additives are well known to those of ordinary skill in the art and are described in various references regarding polymeric materials, e.g. Modern Plastics Handbook and Additives for Plastic Handbook.
  • additives include, but are not limited to, colorants, pigments, plasticizers, lubricants, UV stabilizers, light stabilizers, thermal stabilizers, antioxidants, antistatic agents, flame retardants, fillers, fibers, processing aids, biocides, surfactants, blowing agents, foaming agents, waxes and combinations thereof.
  • the additives can be utilized in various amounts to impart a desired property to the composition.
  • ranges of individual additives within a composition can vary.
  • compositions of the present invention are generally prepared by compounding or blending the desired components in one or more steps, preferably by mixing.
  • the composition is preferably heated to obtain a melted composition, preferably with mixing, to substantially disperse the components thereof, as desired.
  • the blending is preferably performed at a temperature below the decomposition temperatures of the components and generally from about 140° C. to about 200° C.
  • the compositions can be prepared for example in a Banbury, on a two roll mill, in a continuous mixer such as single screw or twin screw extruder, a kneader, or any other mixing machine as known to those of ordinary skill in the art. After preparation of the compositions, they can be processed into any desired form.
  • compositions can be of a form, such as, but not limited to, a powder, pellet, strand, bead, etc., of various shapes and sizes.
  • the compositions can be directly molded, or shaped as desired, for example using an extruder, injection molder, compression molder, calender, or the like.
  • capstock material is high abrasion resistance, excellent outdoor UV protection, high LOI, and good chemical stain resistance.
  • compositions of the present invention can be formed into a useful article, such as any of the articles mentioned herein.
  • Various composites can also be formed including at least one layer of a composition of the present invention and at least a second layer.
  • the composite can be manufactured as articles including, but not limited to, decking, siding, fencing, frames, gutters, appliance housings, appliance liners, building materials, countertops, bathtubs, shower surround materials, railings, shutters, and extruded profiles.
  • FIG. 1 illustrates an article 10 in the form of an article that can be used for wood-replacement applications, for example decking, fencing, railing, siding, and the like.
  • Article 10 includes a substrate or core 12 and a capstock layer 14 .
  • the core 12 can comprise any desired material, such as, but not limited to, a polymeric material, cellulosic material, metallic material, ceramic material or any combination thereof.
  • the substrate or core to which a composition of the present invention can be attached to form a composite is formed from any suitable material.
  • Various thermoplastic resins are especially useful for making building products, but would benefit from a protective or capstock layer of the present invention, with examples including a halogen-containing polymers such as PVC and chlorinated PVC; acrylonitrile-butadiene-styrene (ABS), polyolefins such as polyethylene and polypropylene; polystyrene such as high impact polystyrene; polycarbonate, nylon; polyester; and combinations thereof.
  • the substrate may be foamed, for example foamed PVC, foamed ABS, and other polymeric material.
  • Cellulosic materials include any plant matter, for example wood and various plant fibers, such as flax fiber.
  • the capstock layer 14 comprises a composition of the present invention.
  • the core 12 can have dimensions that vary according to the end use. Typical dimensions are those such as of wood boards utilized for decking, fencing, siding, railing or the like.
  • the capstock layer 14 is a relatively thin coating layer than may have a thickness generally between about 0.38 to about 1.27 mm, desirably from about 0.51 to about 1.14 mm and preferably from about 0.64 to about 1.02 mm.
  • the capstock layer is present on at least one surface of the article 10 . As illustrated in FIG. 1 , the capstock layer 14 covers three sides of the core 12 in one embodiment. If desired, all four sides could be coated with a capstock layer. Likewise, the core in some embodiments may have more than six sides that are coated in some embodiments.
  • composition of the present invention can be bonded to a substrate or core layer to form a composite by various methods.
  • a capstock layer can be bonded to the substrate with an adhesive.
  • the capstock layer and substrate layer are laminated or co-extruded to bond the capstock and substrate layers together. It is to be understood that the present invention is not limited to any particular method of making the composite article or product.
  • a composition of the present and a substrate layer adhere to each other and are materials which are compatible and/or miscible with one another. If desired, various surface treatments can be utilized to promote adhesion. Alternatively or in concert therewith, an adhesive can be utilized to adhere various layers of materials utilized to form a composite including or having a layer comprising a composition of the present invention.
  • compositions of the present invention encompass all possible combinations of the components, including various ranges of said components, disclosed herein. It is further noted that the term ‘comprising’ does not exclude the presence of other elements. However, it is also to be understood that a description on a product comprising certain components also discloses a product consisting of these components. Similarly, it is also to be understood that a description on a process comprising certain steps also discloses a process consisting of these steps.
  • All of the materials before melt mixing were pre-mixed to a substantially free flowing state and were melt mixed with a Farrel Corp banbury batch mixer.
  • the fluxed batch was dropped and probed with an internal batch temperature between 166° C.-188° C.
  • the fluxed batch was then placed through a two roll which was annealed and prepared into a mill sheet.
  • the mill sheet was cut into strips and run through a dicer.
  • the diced pellets were then run through a two roll mill where another mill sheet was prepared. A portion of this mill sheet was then used for the chemical stain testing.
  • the remainder of the mill sheets were then used to compression mold test plaques using a steam heated press for hardness, oxygen index, and abrasion testing.
  • Example Comparative Comparative Comparative Example 1 Example 2
  • Example 3 PVC 97.51 TPU 97.51 ASA 56.19 SAN#1 41.32 SAN#2 1.50 1.50 1.50 SAN#3 4.00 4.00 4.00 Antimyony Oxide 3.00 3.00 3.00 Calcium Stearate 0.30 0.30 0.30 PE Wax 0.05 0.05 0.05 EBS Wax 0.40 0.40 0.40 Stearyl Stearate 0.30 0.30 0.30 Ester AO/UV 0.85 0.85 0.85 Stabilizer 0.60 0.60 0.60 Pigment 6.00 6.00 6.00 Total Parts (weight) 114.51 114.51 114.51 Hardness Hand D 83 50 68 (10 second delay) Oxygen Index % 47.0% 19.5% 20.0% Taber Abrasion - Grams 0.13 0.11 0.24 H18 after lost 1,000 hours Chemical Staining None Moderate Slight after SPF Spray Chemical Staining None V. Slight Slight after Gasoline Chemical Staining S
  • Table 1 presents three comparative examples utilizing a single polymer.
  • Comparative example 1 utilizes PVC which exhibits a high limiting oxygen index and very good chemical stain resistance, but a high hardness and known poor outdoor UV weather and environmental resistance exists.
  • Comparative example 2 utilizes TPU which has a reduced hardness and improved taber abrasion resistance over PVC but exhibits very poor chemical resistance.
  • Comparative example 3 utilizes ASA which is known to provide superior outdoor UV weather and environmental resistance exhibits moderate chemical resistance but has a poor limiting oxygen index and poor abrasion resistance.
  • Table 2 presents three comparative examples utilizing polymer blends with either PVC/TPU, PVC/ASA, or ASA/TPU.
  • Comparative example 4 utilizes PVC/TPU which exhibits a relatively low hardness, very low abrasion resistance, but a low LOI and poor chemical stain resistance.
  • Comparative example 5 utilizes a PVC/ASA blend which has a higher LOI and low abrasion resistance, but has a relatively high hardness and suffers severe staining after Goof Off chemical exposure.
  • Comparative example 6 utilizes an ASA/TPU blend which provides improved hardness, but has poor chemical stain resistance, low LOI, and poor abrasion resistance.
  • the inventive example utilizes a ternary blend comprising PVC/ASA/TPU which has an overall balance of properties that are desirable for capstock decking applications as well as other plastic parts.
  • This inventive sample achieves desirable chemical stain resistance, higher LOI, good abrasion resistance, reduced hardness, and good outdoor UV resistance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)
US14/501,427 2014-09-12 2014-09-30 Compositions for capstock applications Abandoned US20160075866A1 (en)

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US14/501,427 US20160075866A1 (en) 2014-09-12 2014-09-30 Compositions for capstock applications
CA2960808A CA2960808C (en) 2014-09-12 2015-09-01 Compositions for capstock applications
MX2017003263A MX395368B (es) 2014-09-12 2015-09-01 Composiciones para aplicaciones de plataformas de material compuesto (capstock).
EP15840766.8A EP3191548B1 (en) 2014-09-12 2015-09-01 Method for preparing compositions for capstock applications
PCT/US2015/047848 WO2016040043A1 (en) 2014-09-12 2015-09-01 Compositions for capstock applications
CN201580049796.2A CN107075245A (zh) 2014-09-12 2015-09-01 用于贴面应用的组合物
US16/171,991 US11059234B2 (en) 2014-09-12 2018-10-26 Compositions for capstock applications

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EP3191548B1 (en) 2022-04-27
WO2016040043A1 (en) 2016-03-17
CA2960808C (en) 2020-10-20
MX2017003263A (es) 2017-06-29
CA2960808A1 (en) 2016-03-17
MX395368B (es) 2025-03-25
US11059234B2 (en) 2021-07-13

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