Thermoplastic compositions, methods of manufacture, and articles thereof

A composition and product technology, applied in the field of laser weldable thermoplastic compositions, can solve the problems of reducing the molecular weight of crystalline materials, unstable melt viscosity, etc.

Active Publication Date: 2015-08-26
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of such chemical nucleating agents can reduce the molecular weight of the crystalline material and lead to unstable melt viscosities
Furthermore, such chemical nucleating agents can substantially degrade many amorphous materials used in PBT blends, such as polycarbonates and polyestercarbonates, resulting in unstable melt viscosities and other undesirable defects such as splay and Jet (deformation due to turbulence)

Method used

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  • Thermoplastic compositions, methods of manufacture, and articles thereof
  • Thermoplastic compositions, methods of manufacture, and articles thereof
  • Thermoplastic compositions, methods of manufacture, and articles thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0071] During the preparation of polycarbonate, the Friesian rearrangement indicated the repeating units present in the polycarbonate with the following formula:

[0072]

[0073] Where R a , R b , P, q, and X a As defined above. R c It can be a hydroxyl group or carbonate or ether. The polymer chain can be formed by carbonate or ether groups. R d It can be hydrogen or substituted aryl groups. The polymer chain can be formed by substituted aryl groups. For example, the following rearrangements can occur (linear fries, branched / ether fries, and acid fries):

[0074] Straight chain fries

[0075] Branched Chain / Ether Fries

[0076] Sour Fries

[0077] During the melt polymerization process, the total amount of branched Friesian rearrangement can be adjusted by changing the temperature and / or the reaction time. This is because the by-products formed at high temperatures include the Friesian rearrangement of carbonate units along the growing polymer chain. The Friesian rearrangeme...

Embodiment approach 1

[0105] Embodiment 1: A composition prepared by a method including melt blending: (a) 10 to 70 weight percent of a partially crystalline polyester component selected from poly(terephthalic acid) Butylene), poly(ethylene terephthalate), poly(butylene terephthalate) copolymer, poly(ethylene terephthalate) copolymer, and combinations thereof; (b) 10 to 60 weight percent of an amorphous polycarbonate, the amorphous polycarbonate having a Friesian rearrangement greater than 150 to 10,000 ppm; (c) 5 to 50 weight percent of filler; and (d) optionally, 0.01 to 10 wt% of antioxidants, mold release agents, colorants, stabilizers, or combinations thereof; wherein the melt blend composition has a polycarbonate aryl hydroxyl end group content of at least 300 ppm; and wherein, when molded When forming a product with a thickness of 2.0 mm, the composition provides a near-infrared transmission greater than 45% at 960 nanometers.

Embodiment approach 2

[0106] Embodiment 2: The composition according to Embodiment 1, wherein, when molded into an article having a thickness of 2.0 mm, based on the average value of samples molded at 70°C and 90°C, the composition provides greater than 48% near infrared transmission.

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Abstract

A laser weldable composition made from a process of melt blending a combination of a partially crystalline thermoplastic polyester component such as poly(butylene terephthalate), an amorphous thermoplastic polycarbonate having a Fries rearrangement of greater than 150 to 10,000 ppm, and a filler such as glass fiber. The laser weldable composition has a polycarbonate aryl hydroxy end-group content of at least 300 ppm and provides improved near infrared transmission at 960 nanometers. A method welding components made from the weldable composition and welded articles made therefrom are also disclosed.

Description

Technical field [0001] The present disclosure relates to thermoplastic compositions, especially laser weldable thermoplastic compositions, preparation methods and products thereof. Background technique [0002] Thermoplastic compositions are used to make a variety of products, including laser welded products. Laser welding of two polymer parts by transmission welding requires that one of the polymer parts is basically transparent to the laser for transmitting it to the welding interface, while the other part absorbs a large amount of laser light, thereby producing a The heat of welding at the interface of the part. External pressure is applied to ensure uninterrupted contact between the surfaces of the components, and heat conduction between the components causes the polymer in the absorption component and the transmission component to melt, thereby providing welding at the interface. [0003] Near infrared (NIR) wavelength lasers are used for welding. The level of NIR transmiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L69/00
CPCB29C66/73773C08L67/03B29C65/1616C08L67/02B29C65/1635C08L69/00B29C66/71B29C65/1677B29C66/73771B29C66/73921C08K7/14B29K2067/00B29K2067/003B29K2067/006B29K2069/00
Inventor 托尼·法雷尔安德里斯·J·P·范 茨尔约翰内斯·许贝特斯·加布里埃尔·玛丽·洛迈耶
Owner SABIC GLOBAL TECH BV
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