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Additive blend for enhancing water vapor permeability and increasing cell size in thermoplastic foams

A thermoplastic polymer and foam technology, used in transportation and packaging, thin material handling, etc., can solve the insulation value and high cost of products with high density, small cell size and cannot be foamed, and achieve low global warming. ability, the effect of improving vapor permeability

Inactive Publication Date: 2012-11-14
OWENS CORNING INTELLECTUAL CAPITAL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the cell sizes of the foams produced by these generally environmentally friendly blowing agents are too small to provide acceptable insulation value to the foamed product and often result in a higher density and higher cost product

Method used

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  • Additive blend for enhancing water vapor permeability and increasing cell size in thermoplastic foams
  • Additive blend for enhancing water vapor permeability and increasing cell size in thermoplastic foams
  • Additive blend for enhancing water vapor permeability and increasing cell size in thermoplastic foams

Examples

Experimental program
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Embodiment

[0087] water vapor permeability

[0088] Blends described in Table 1 were formed containing polystyrene, HFC-134a / HFC-152a as a blowing agent, graphite, and a blend of ethoxylated polyethylene oxide and styrene / maleic anhydride copolymer composition (additive blend) and used to generate foam board samples. Specifically, nano-graphite was compounded into general-purpose polystyrene with the following properties at an active amount of 20%: Mw 253000, Mn 613000, Mz 532500, Mw / Mn (polydispersity) 3.44. The additive blend was compounded into general purpose polystyrene at 0.5%, 1 / 0%, 1.5%, 2.0%, 4%, 6%, 8%, 10%, and 12% active. The blowing agent used was a 50:50 blend of HFC-134a / HFC-152a in an amount of 7.5 wt%, based on resin weight. Foam boards were formed from this composition on an Owens Corning horizontal pilot line extruder at a dry process rate of 160 kg / hour.

[0089] Table 1

[0090]

[0091] Once the foam panels were prepared, the panels were tested for water vapo...

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Abstract

Polymeric foam and polymeric foam products that contain a foamable polymer material, at least one blowing agent, an additive blend of polyethylene oxide and a copolymer of polystyrene and maleic anhydride, and optionally, an infrared attenuating agent, are provided. In exemplary embodiments, the polyethylene oxide is ethoxylated polyethylene oxide. Additionally, in at least one embodiment, the blowing agent includes at least one hydrofluorocarbon blowing agent. The blend of ethoxylated polyethylene oxide and copolymer of polystyrene and maleic anhydride provides a water vapor permeability of 1.1 perm inch or greater in the extruded foam product and increases the average cell size of the foam product without detrimentally affecting physical or thermal properties of the product.; Additionally, the additive acts as a cell enlarger, a water vapor permeability enhancer, a plasticizer, and a processing aid. A method of forming an extruded foam product is also provided.

Description

[0001] Technical field and industrial applicability of the invention [0002] The present invention relates generally to extruded foam products, and more particularly, to polystyrene foam comprising a blend of ethoxylated polyethylene oxide and styrene / maleic anhydride copolymer, wherein the Polymeric foams have improved water vapor permeability, have increased average cell size, are non-ozone depleting and have low global warming potential. Methods of forming such polymeric foams are also provided. Background of the invention [0003] Foamed resin structures can be used in a wide variety of applications, such as thermal insulation, in mats, as packaging, and as adsorbents. Extruded foams are typically produced by melt mixing a polymer together with any desired additives to produce a polymer melt. The blowing agent is mixed with the polymer melt at a suitable temperature and pressure to produce a foamable gel mixture. The foamable gel mixture is then cooled and extruded int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L71/02C08L35/06C08K3/04C08J9/04
CPCC08J2205/10C08J2325/06C08J2471/00C08J2205/052C08J2435/06C08J9/0066C08J9/0061Y10T428/249953Y10T428/249976Y10T428/249977Y10T428/249986
Inventor Y·德拉维兹R·M·布赖恩德尔J·F·小布丁斯卡克
Owner OWENS CORNING INTELLECTUAL CAPITAL LLC
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