Nanocellular thermoplastic foam and process for making the same

A thermoplastic polymer and foam technology, applied in the field of manufacturing the foam, can solve the problems that large foam samples have no practical significance and extreme engineering requirements, and achieve the effect of small cell size and high nucleation density

Active Publication Date: 2015-06-24
DDP SPECIALTY ELECTRONICS MATERIALS US 8 LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the engineering needs to achieve the required high pressures of carbon dioxide and/or explo

Method used

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  • Nanocellular thermoplastic foam and process for making the same
  • Nanocellular thermoplastic foam and process for making the same
  • Nanocellular thermoplastic foam and process for making the same

Examples

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example

[0084] The following examples use polymers selected from Table 1 or Table 2 as thermoplastic polymers. Table 1 lists three different polymethylmethacrylate-co-ethylmethacrylate (PMMA-co-EMA) copolymers obtained from Scientific Polymer Products. Table 2 lists the SAN copolymer (TYRIL TM 125, TYRIL is a trademark of The Dow Chemical Company).

[0085] Table 1

[0086]

[0087] Table 2

[0088]

[0089] The compositions of Comparative Examples (Comp Ex) and Examples (Ex), and the characteristics of the resulting thermoplastic polymer foams are provided below. Each Comparative Example and Example followed similar mixing and foaming procedures.

[0090] POSS masterbatch

[0091] A masterbatch of polyhedral silsesquioxane (POSS) suitable for use in the following selected examples was prepared as follows. POSS (Catalogue # MA0735) was obtained from Hybrid Plastics Inc. One gram of POSS was dissolved in four grams of ethanol, and the resulting solution was added to 49 gr...

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Abstract

Prepare a thermoplastic polymer foam having a porosity of 70% or more and at least one of: (i) an average cell size of 200 nanometers or less; and (ii) a nucleation density of at least 1x1015 effective nucleation sites per cubic centimeter of foamable polymer composition not including blowing agent using a foamable polymer composition containing a thermoplastic polymer selected from styrenic polymer and (meth)acrylic polymers, a blowing agent comprising at least 20 mole-percent carbon dioxide based on moles of blowing agent and an additive having a Total Hansen Solubility Parameter that differs from that of carbon dioxide by less than 2 and that is present at a concentration of 0.01 to 1.5 weight parts per hundred weight parts thermoplastic polymer.

Description

[0001] This invention was made with US Government support under Contract No. DE-EE0003916 awarded by the Department of Energy. The US Government has certain rights in this invention. technical field [0002] The present invention relates to thermoplastic polymer foams having nano-sized cells, and methods of making said foams. Background technique [0003] Polymeric foam items (or simply "polymeric foam") are commonly found in insulation applications. A number of characteristics of polymeric foams affect the thermal conductivity through the foam, and thus the effectiveness of the foam as a thermal insulator. For example, it is known that heat transfer through polymeric foam insulation can occur by conduction, radiation, and convection (see, eg, the teachings in US Patent Application Publication 2009 / 0148665). In typical polymeric foam insulation, the dominant mode of heat transfer is cell gas conduction, which contributes about 75% of the total thermal conductivity. Theref...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08J9/12B29C44/34
CPCB29C44/348C08J9/0042C08J9/122C08J2203/06C08J2205/042C08J2325/06C08J2333/06B29K2995/0015B29K2995/0007B29K2025/06B29K2033/08B29K2101/10B29K2105/041C08J2203/00C08J2325/12C08J2333/12C08J9/0023C08J9/04
Inventor L·朱S·科斯特K·A·帕坦卡J·D·摩尔
Owner DDP SPECIALTY ELECTRONICS MATERIALS US 8 LLC
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